Å Ò ×ú n ÞV R Ë Ò Å Ò ×; c 6 X ¢ ë Å ì Å: g Õ Û( 133 Cs)8 ý ; c .U 8 ýÇ X Ø ú n ÞV R Ë ºT mì ÅX ì Ä ¤X N Ë

(1)

1 Z 4, pp. 7∼15

ì

Å Ò ×ú n ÞV R Ë Ò Å Ò ×; c 6 X ¢ ë Å ì Å: g Õ Û( ¹³³ Cs)8 ý ; c .U 8 ýÇ X Ø ú n ÞV R Ë ºT mì ÅX ì Ä ¤X N Ë

*

× <+ ä ¸ 6 Ò

1 l

x @ / < Æ § õ < Æ@ / < Æ èF Ó ü t o < Æõ , Â Òí ß 604-714

T

~ x

1 l

x " f@ / < Æ § Ð| _ « Ñ> \ P ~ ½ Ó < Æõ , Â Òí ß 617-716

(2010¸ 11 Z 4 23{ 9 ~ Ã Î6 £ §, 2010¸ 12 Z 4 20{ 9 Ã º& ñ : r ~ Ã Î6 £ §, 2011¸ 1 Z 4 17{ 9 > F S X & ñ )

133

Cs(n, γ) ì ø Í6 £ x \ @ /ô Ç × æ$ í í S \ é ß & h ` ¦ \ -t 0.003 eV\ " f 60 eV\ 5 g 8 £ ¤& ñ % i . : r

½ ¨\ 6 x ) a × æ$ í H § Ð@ / < Æ § " é ¶ Ðz ´+ « > è_ 46-MeV + þ A5 Å q l \ " f_ F gÙ þ ì ø Í6 £ x

`

¦ : x K µ 1 ÏÒ q t ) a × æ$ í s ¦ TOF ~ ½ ÓZ O Ü ¼ Ð % 3 % 3 . Bi

⁴

Ge

3

O

12

(BGO) $ 3 F g ^ Ð ½ ¨$ í ) a 12 > h_ \

-t f ¨ Ã º Ø ¦ © u Ð

¹³³

Cs(n, γ) ì ø Í6 £ x Ü ¼ ÐÂ Ò' ¸ H 7 £ ¤ µ 1 Ïy ` ¦ 8 £ ¤& ñ % i ¦, s Ø ¦ © u H × æ

$ í

Ò q t$ í ³ ð& h Ü ¼ ÐÂ Ò' o 12.7 ± 0.02 m 0 Au \ [ O u % i . r « Ñ\ { 9 ÷ & H × æ$ í 5 Å q` ¦ ½ ¨

l 0 AK

¹⁰

B r « Ñ_

¹⁰

B(n, αγ)

⁷

Li ì ø Í6 £ x` ¦ s 6 x % i ¦, × æ$ í 5 Å q _ o\ ¦ y r l 0 AK × æ$ í

5 Å q × æ ç ß \ BF

3

Ø ¦ l \ ¦ [ O u % i . l > r _

¹³³

Cs(n, γ) ì ø Í6 £ x é ß & h 8 £ ¤& ñ õ H & ñ x 9 ¸ ± ú

É r Lead-Slowing Down Spectrometer Ð 8 £ ¤& ñ ) a Ju. P. Popov ü < F. Widder_ õ ÷ r s % 3 Ü ¼ 9, : r

½

¨\ ¦ : x # Ð & ñ S X ô Ç z ´+ « > õ \ ¦ % 3 % 3 . % 3 # Q õ H > í ß \ _ ô Ç JENDL3.3, ENDF/B-VI x 9

JEF-3.1_ ¨ î õ ü < q § % i .

Ù þ

d # Q:

¹³³

Cs, × æ$ í , í S \ , TOF, BGO Ø ¦ l , é ß & h

A Study on the Energy-dependent Neutron-capture Cross-section of Natural Cesium( ¹³³ Cs) by Using a Continuous Neutron Flux

Jungran Yoon

Department of New Material Physics, Dong-A University, Pusan 604-714

Samyol Lee ^∗

Department of Radiological Science, Dongseo University, Pusan 617-716 (Received 23 November 2010 : revised 20 December 2010 : accepted 17 January 2011)

The neutron-capture cross section of natural cesium (

¹³³

Cs) has been measured in the energy region from 0.003 eV to 60 eV by using the neutron time-of-flight (TOF) method with a 46-MeV electron linear accelerator (linac) at the Research Reactor Institute, Kyoto University (KURRI). An assembly of Bi

4

Ge

3

O

12

(BGO) scintillators composed of 12 pieces of BGO and placed at a distance of 12.7 ± 0.02 m from the neutron source was employed as a total energy absorption detector for the prompt capture γ-ray measurement on the sample. In order to determine the neutron flux impinging on the capture sample, a plug of

¹⁰

B powder sample and the

¹⁰

B(n, α γ) standard cross section were used. The previous experimental data (Ju. P. Popov and F. Widder) and the evaluated data in JENDL-3.3, ENDF/B VI and JEF-3.1 were compared to the current measurement.

PACS numbers: 24.30.-V

Keywords:

¹³³

Cs, Neutron, Capture, TOF, BGO, Cross-section

∗

E-mail: [email protected]

-7-

(2)

I. " e Â ] Ø

×

æ$ í í S \ é ß & h É r Ù þ ½ ¨ ¸ > í ß \ 9 כ ¹ô Ç × æ כ ¹ô Ç X <

s

' \ ¦ ] j/ B N l ¸ 9 [1], × æ$ í ` Ó ü t \ @ /ô Ç > í ß

\

e # Q" f ¸ × æ כ ¹ô Ç l í X <s ' ) a . & ³F Ö ¸ µ 1 Ïy

½

¨ ' ÷ & ¦ e H ¦5 Å q 7 £ xd Ð(FBR: Fast Breeder Re- actor) ü < 5 Å q l ½ ¨1 l x Ð(ADSR: Accelerator Driven Sys- tem Reactor) _ ¸d [ O > , ` [ O > x 9 " é ¶ Ð \ P Ø ¦§ 4 > í

ß r 9 כ ¹ô Ç l í X <s ' Ð ¸ 6 x ÷ &# Q [2–5]. " é ¶

Ð\ " f Ò q t$ í ÷ & H ~ ½ Ó $ í ` l Ó ü t % o \ e # Q" f

¹³³

Cs _

×

æ$ í í S \ é ß & h É r B Ä º × æ כ ¹ô Ç Ó ü t o | ¾ Ó î r X < X

<

¹³³

Cs(n, γ)

¹³⁴

Cs ì ø Í6 £ x _ \ P × æ$ í í S \ é ß & h É r 28 barn Ü ¼ Ð q §& h H ¼ # \ 5 Å q # ¸d _ $ í 0 p x` ¦ or v

H " é ¶ s ÷ &l ¸ ô Ç . ÷ r ë ß m Ä ºÅ ÒÓ ü t o \ ½ Ó

$ í

? /Â Ò\ " f_ " é ¶ è½ + Ë$ í õ & ñ × æ s- x 9 r-process_ ¸4 S q

>

í ß \ × æ כ ¹ô Ç כ ¹ è Ð+ 6 x ) a [6–8]. " f $ [ þ t

É

r § Ð@ / < Æ § " é ¶ Ð z ´+ « > è_ 46-MeV + þ A5 Å q l

\ " f µ 1 ÏÒ q t÷ & H × æ$ í \ ¦ s 6 x # \ P × æ$ í ÐÂ Ò' Ã º z

eV_ \ -t % ò % i \ @ /ô Ç × æ$ í í S \ é ß & h ` ¦ Ã º¸

\

5 g 8 £ ¤& ñ K ¸ ¦ e [9–11]. : r ½ ¨\ " f À Ò ¦ e

H \ P × æ$ í % ò % i \ " f 60 eV\ s Ø Ô H \ -t # 3 0 A

\

" f_

¹³³

Cs(n, γ) ì ø Í6 £ x \ @ /ô Ç é ß & h É r Fig. 1 õ Table 1 \ " f · p כ õ ° ú s " é ¶ Ð\ " f µ 1 ÏÒ q t ) a × æ$ í \ ¦ s 6

x ô Ç כ Ü ¼ Ð 5 Å q ¸ Z > l _ TOF(Time-of-Flight) ~ ½ ÓZ O ` ¦ s

6 x # 8 £ ¤& ñ ô Ç F. Widder_ õ e t ë ß 5.9 eV/ B N" î

`

¦ Ø æì r y F & ³ t 3 l w ¦ e 6 £ §` ¦ · ú Ã º e . ¢ ¸ô Ç 5.9 eV Å Ò/ B N" î Â Òì r \ H × æ$ í \ -t ì r K 0 p x s ± ú É r Ju. P.

Popov x 9 F. L. Shapiro_ õ \ ¦ í < Êô Ç \ P × æ$ í % ò % i _

õ [ þ t ë ß > r F ½ + É ÷ r % ò % i \ " f H 8 £ ¤& ñ õ > r F

t · ú § H . Õ ªo ¦ Popov_ õ H SLODT(Slowing Down Time) Detector © u \ ¦ s 6 x ô Ç כ Ü ¼ Ð \ -t ì r K

0 p x s ± ú ¨ î ç H í S \ é ß & h _ õ ë ß ` ¦ ] j/ B N ô Ç . [12, 13] s ü < ° ú s × æ$ í í S \ 8 £ ¤& ñ õ [ þ t s \ P × æ$ í % ò % i

\

" f keV \ -t % ò % i \ 5 g" f 8 £ ¤& ñ X <s ' _ ª õ | 9 s

p f ¨ ¦ f 8 £ ¤& ñ ÷ &t 3 l w ô Ç \ -t ½ ¨ç ß ¸ e Ü ¼ 9, 8

£ ¤& ñ _ & ñ x 9 ¸ ¸ ë ß 7 á ¤ Û ¼X O t 3 l w ô Ç כ s & ³z ´s . ¨ î

)

a õ Ð H Å Ò Ð Ù þ ì r\ P õ Ö 6 x ½ + Ë\ ' aº ) a X <s ' \ ¦ ¨ î

H JEF-3.1, ENDF/B-VI, JENDL-3.3 [14–16] _ õ

e Ü ¼ : r ½ ¨_ õ & ñ S X ô Ç / B N" î ` ¦ F & ³ ¦ e t

3 l w < Ê` ¦ · ú Ã º e % 3 . " f

¹³³

Cs(n, γ) ì ø Í6 £ x \ @ /ô Ç

&

ñ S X ô Ç × æ$ í í S \ é ß & h É r # Q t s Ä »\ " f ] X z ´y כ

¹½ ¨÷ & ¦ e H © S ! s .

: r ½ ¨ H { 9 : r § Ð@ / < Æ " é ¶ Ðz ´+ « > è_ y © § 4 ô Ç ` O Û ¼ + þ

AI _ 46-MeV + þ A 5 Å q l Ð 5 Å q ) a \ ¦ s 6 x

# Ta ³ ð& h Ü ¼ ÐÂ Ò' _ F gÙ þ ì ø Í6 £ x` ¦ { 9 Ü ¼& µ 1 ÏÒ q t ) a × æ

Fig. 1. The evaluated data of ENDF/B-VI, JENDL- 3.3, JEF-3.1 and the previous measurement data for the

133

Cs(n, γ)

¹³⁴

Cs Reaction.

Table 1. Experiments in the Previous Thermal Measure- ments for the

¹³³

Cs(n, γ)

¹³⁴

Cs Reaction.

XX XX

XX XX X Results

Quantity

Year Method

F. Widder [12] 1974 Fast Chopper, Thermal Reactor Ju. P. Popov and

1962 SLODT(Slowing Down Time) F. L. Shapiro [13] Detector

JEF-3.1 [14] 1994 Evaluated value ENDF/B-VI [15] 1996 Evaluated value JENDL-3.3 [16] 2002 Evaluated value

$ í

\ ¦ s 6 x K , × æ$ í q ' r ç ß (Time-of-flight)Z O x 9

\

-t f ¨ Ã º+ þ A 12> h_ BGO(Bi

⁴

Ge

3

O

12

) $ 3 F g Ø ¦ l

Ð, \ -t 0.003 eV\ " f 60 eV\ s Ø Ô H × æ$ í \ @ / ô

Ç

¹³³

Cs _ × æ$ í í S \ é ß & h ` ¦ 8 £ ¤& ñ % i . : r ½ ¨\

"

f % 3 # Q õ H l > r _ F. Widder [1]_ 8 £ ¤& ñ õ x 9

¨ î

° ú כ[ þ t õ q § % i . ¢ ¸ô Ç, % 3 # Q õ H 0 A\ " f /

å

L ô Ç # Q ì r \ " f Ä »6 x > 6 x| ¨ c כ Ü ¼ Ð l @ /÷ & 9,

×

æ$ í í S \ é ß & h ` ¦ 8 £ ¤& ñ H l Õ ü t õ K $ 3 ~ ½ ÓZ O É r Ù þ Ó ü t o

< Æõ " é ¶ § 4 / B N < Æ ì r _ í S \ é ß & h 8 £ ¤& ñ \ כ ¹| > s

6 x| ¨ c כ Ü ¼ Ð l @ / ) a .

II. ÷ m Ç] M öX ê sV õ m Í U ê s0 n É

1. ú n ÞV R Ë ® ot õ m Í P c p Ò Å ß e È û s ÚM

: r ½ ¨ H § Ð@ / < Æ" é ¶ Ðz ´+ « > è(KURRI: Kyoto University Research Reactor Institute) _ 46-MeV

+ þ A5 Å q l (LINAC)ü < \ -t f ¨ Ã º Ø ¦ l

(3)

Fig. 2. Experimental arrangement for the capture cross section measurement.

Table 2. Details of the measuring conditions in the cur- rent experiment.

Electron energy 30 MeV Linear accelerator Pulse width 3 µsec

condition Repetition rate 50 Hz Peak current 500 mA Time digitizer of Time/channel 4 µs/ch time-of-flight Full channel number 4096 ch

BGO(B

₄

G

₃

O

₁₂

) $ 3 F g Ø ¦ l \ ¦ s 6 x # × æ$ í TOF(Time-of-Flight) ~ ½ ÓZ O Ü ¼ Ð 8 £ ¤& ñ % i . ^ & h z ´ +

« >C u ¸\ ¦ Fig. 2 \ ? /% 3 ¦, z ´+ « >\ 6 x ô Ç × æ$ í

q ' â Ð H KURRI + þ A5 Å q l _ c \ @ /

# 135

^◦

_ y ¸ Ð [ O u ÷ &% 3 . Ta × æ$ í Ò q t$ í ³ ð& h

© u ÐÂ Ò' µ 1 ÏÒ q t ) a × æ$ í 5 Å q(neutron flux) É r × æ$ í

Ò q t$ í ³ ð& h © u ÐÂ Ò' 12.7 ± 0.02 m b # Q 0 Au \ [ O

u ÷ &# Q e H r « Ñ\ { 9 > ) a . BGO Ø ¦ l H Hitachi Chemical Industry \ _ K " f ] j ) a 5 × 5 × 7.5 cm

³

ß ¼l _ $ 3 F g# 4 [ t 12 > h Ð ½ ¨$ í ÷ &# Q e . r « Ñ\ { 9

÷ & H × æ$ í 5 Å q` ¦ ½ ¨ l 0 AK

¹⁰

B r « Ñ_

¹⁰

B(n, αγ)

⁷

Li ì ø Í6 £ x` ¦ s 6 x % i ¦, × æ$ í 5 Å q _ o\ ¦ y r

l 0 AK " f × æ$ í 5 Å q × æ ç ß \ BF

³

Ø ¦ l \ ¦ [ O u Ù þ ¡

. z ´+ « > © u x 9 ~ ½ ÓZ O \ @ /ô Ç © [ jô Ç ? /6 x É r : r ½ ¨\

"

f · ú ¡" f Ð ¦ô Ç 7 Hë H \ Ð ¦÷ &% 3 [9–11]. + þ A

5 Å

q l _ ¸| õ TD(Time Digitizer)_ ¸| É r Table 2 \

? /% 3 .

2. ¤X N ËS z »

×

æ$ í í S \ z ´+ « >\ 6 x ô Ç r « Ñ_ ] j" é ¶ É r Table 3 \

? /% 3 .

¹³³

Cs ì r ´ ú r « Ñ H ¿ ºa 0.3 mm_ ¿ ºa _ AlF K5 Å q ó ø ÍÜ ¼ Ð ë ß [ þ t # Q © 5 Å q \ V , # Q × æ$ í \ ¦ ¸

Table 3. Physical parameters of the samples used in the current experiment.

Sample

¹³³

Cs

¹⁰

B*

Physical form Oxide powder(Cs

2

O) Metal powder Chemical purity(%) 66.6 99.999 Isotopic composition (%) Natural 96.98

Weight of sample(g) 1.89 2.92 Thickness of sample(cm) 0.3 0.8

(Atoms/kb) 2.4 52.42

Size of sample (cm

²

) 1.8 × 1.8 1.8 × 1.8

∗ 10

B_ F K5 Å qì r ´ ú É r 0.1 mm ¿ ºa _ Al F K5 Å q ó ø ÍÜ ¼ Ð ë ß [ þ t # Q

© \ [ þ t # Qe .

∗ 10

B: 96.98 %,

¹¹

B: 3.02 %

% i . r « Ñ_ ¿ ºa H a % ~ É r ñ/¸ ú 6 £ § q \ ¦ % 3 ¦, r « Ñ

?

/\ " f_ { 9 × æ$ í _ \ -t \ _ > r H × æ$ í l

` ´ òõ x 9 × æ í ß ê ø Í´ òõ \ ¦ ¦ 9ô Ç כ s . F K5 Å qì r ´ ú + þ

AI _

¹⁰

B É r \ -t _ > r × æ$ í 5 Å q` ¦ 8 £ ¤& ñ l 0 AK

"

f 6 x ÷ &% 3 ¦, ¿ ºa 0.1 mm_ Al F K5 Å q ó ø ÍÜ ¼ Ð ë ß [ þ t # Q

© 5 Å q \ V , % 3 . s r « Ñ[ þ t É r BGO $ 3 F g Ø ¦ l _ × æ d

Â Òì r \ [ O u % i .

III. ÷ m Ç] M ö z » Ä Z ØV Ä U ê s0 n É

1. ø m É ú n ÞV R Ë Ò Å Ò × õ m Í ºT mì ÅX ì Ä 4 m

: r ½ ¨\ " f H r « Ñ\ { 9 ÷ & H × æ$ í 5 Å q` ¦ ½ ¨ l

0 AK " f

¹⁰

B(n, αγ) ì ø Í6 £ x` ¦ s 6 x % i . s ì ø Í6 £ x É r { 9

× æ$ í _ \ -t \ ' a > \ O s 478 keV_ é ß { 9 y

` ¦ ~ ½ ÓØ ¦ l M :ë H \ Ø æì r y ¿ º î r r « Ñ\ @ /K " f H { 9

÷ & H ¸ H × æ$ í \ ¦ f ¨ Ã º > ÷ & ¦ µ 1 ÏÒ q t ) a é ß { 9 y

` ¦ ¸¿ º 8 £ ¤& ñ > ÷ & { 9 ÷ & H ¸ H × æ$ í \ - t

\ @ / # × æ$ í _ Ø ¦ ´ òÖ ¦ É r { 9 & ñ ¦ ^ ¦ Ã º e

. " f y Ø ¦ ´ òÖ ¦ É r 1 s ÷ & 9, × æ$ í í S \ Ã º Y

B

(E) H 1 s ) a . C

^B

(E)` ¦

¹⁰

B r « Ñ\ _ ô Ç × æ$ í í S \

Ö ¦ Ð ³ ðr , e _ _ × æ$ í \ -t \ " f_ { 9 × æ

$ í

5 Å q φ(E) É r Ø ¦ ´ òÖ ¦ ε

B

\ ¦ s 6 x # 6 £ § õ ° ú s

³

ð & ³½ + É Ã º e .

φ(E) = C

B

(E)/ε

B

/Y

B

(E) = C

B

(E)/ε

B

(1) s

M : µ 1 ÏÒ q t ) a y É r

¹⁰

B r « Ñ ? /\ " f ` ´ òõ )

\ O H כ É r m t ë ß : r ½ ¨\ " f H Á ºr K ¸ 0 p x ½ + É

&

ñ ¸ Ð B Ä º . Ó ü t| 9 õ _ © ñ 6 x s { 9 # Q 8 ¸ 478 keV y _ â Ä º Å Ò Ð 9 u á Ô í ß ê ø Ís { 9 # Q > ÷ &

¦ s כ É r BGO Ø ¦ l \ " f 8 £ ¤& ñ > ) a .

(4)

: r ½ ¨\ 6 x ô Ç BGO Ø ¦ © u H \ -t f ¨ Ã º Ø

¦ © u s Ù ¼ Ð y Ø ¦ ´ òÖ ¦ ε

B

H 1 s ) a . " f d

(1) É r A ü < ° ú s ³ ð & ³ | ¨ c Ã º e . 7 £ ¤

¹⁰

B _ × æ$ í

í S \ \ " f _ K " f % 3 # Q í S \ Ò ¦ s r « Ñ\ { 9 ÷ & H × æ

$ í

5 Å q` ¦ ? /> ) a .

φ(E) = C

_B

(E) (2) ô

Ç¼ # \ -t E\ " f_ × æ$ í í S \ Ö ¦ É r 6 £ § õ ° ú s

è q Ã º e .

C

S

(E) = ε

S

Y

S

(E)φ(E) (3)

#

l \ " f s_ ' H

¹³³

Cs(n, γ) r « Ñ\ ¦ _ p ô Ç . × æ$ í

í S \ Ã º Y

^S

(E) H d (2)ü < (3)` ¦ 6 x # 6 £ § õ ° ú s

³ ð & ³½ + É Ã º e .

Y

S

(E) = C

S

(E)Y

B

(E)/C

B

(E)/ε

S

, (4)

#

l " f C

^S

(E) ü < C

^B

(E) H 8 £ ¤& ñ \ _ K " f % 3 # Q| 9 Ã º e

¦, ε

S

H : r ½ ¨\ " f H % 3 ` ¦ Ã º \ O Ü ¼Ù ¼ Ð Y

S

(E) H { 9

× æ$ í \ @ / # © @ /& h ° ú כÜ ¼ Ð % 3 # Q .

×

æ$ í í S \ é ß & h É r r « Ñ? /\ " f í S \ ÷ & H × æ$ í í S \

Ã º\ _ K > í ß | ¨ c Ã º e Ü ¼ 9, × æ$ í í S \ Ã º H 6 £ § õ

° ú

s è q Ã º e [17].

Y

S

(E) = (1 − exp(−N σ

t

(E)t))σ

C

(E)f

C

/σ

t

(E), (5)

#

l " f N É r r « Ñ_ " é ¶ x 9 ¸(atomic density)s ¦, σ

t

(E) É r × æ$ í é ß & h , t H r « Ñ_ ¿ ºa , σ

^C

(E) H × æ

$ í

í S \ é ß & h , f

_C

H r « Ñ ? /\ " f_ × æ$ í × æ í ß ê ø Íõ

l ` ´ òõ \ @ /ô Ç Ð& ñ > Ã ºs 9, > í ß \ _ K " f % 3

#

Q& . " f d (4)ü < d (5)\ ¦ : x K " f © @ /& h \ - t

_ > r × æ$ í í S \ é ß & h σ

c

(E)` ¦ % 3 ` ¦ Ã º e . % 3

#

Q õ H ENDF/B-VI [16] _ \ P × æ$ í í S \ é ß & h 29 barn \ ½ © o % i .

2. S z » ¤B s; c 8 ý X ¢ ú n ÞV R Ë ÿ ¤| ºX N ËÊ Ý ~ ¾

×

æ$ í í S \ é ß & h 8 £ ¤& ñ \ e # Q" f, r « Ñ ? /\ " f_ é ß { 9

í ß ê ø Í < Ê É r × æ í ß ê ø Í´ òõ H B Ä º × æ כ ¹ . s ´ òõ H r

« Ñ_ Ä »´ ò¿ ºa 7 £ x ½ + ÉÃ º2 ¤ & t 9, { 9 × æ$ í _ ~ ½ Ó

¾ Óõ ¸ ' aº $ í s B Ä º Z } . ÷ r ë ß m r « Ñ_ Ä »´ ò¿ º a

7 £ x × æ$ í _ l ` ´ òõ \ _ K " f r « Ñ _

× æ$ í í S \ Ã º H ´ ú § É r 1 l x` ¦ 4 R ` ¦ Ã º e .

"

f × æ$ í í S \ z ´+ « >\ " f H s ´ òõ [ þ t` ¦ 9 y ¦ 9K

H # Q 9î r & h s e . s ü < ° ú É r ´ òõ \ ¦ ¦ 9 l 0 AK

Fig. 3. The correction function for the neutron self- shielding and/or neutron scattering effects in the current cross section measurement.

Fig. 4. Comparison of the previous experimental cross sections and the evaluated cross sections for the

¹³³

Cs(n, γ) reaction with the present measurement.

"

f d (5)` ¦ Ã ºu & h Ü ¼ Ð ç ß é ß > > í ß l # Q 9Ä ºÙ ¼ Ð { 9

ì ø Í& h Ü ¼ Ð ¸ ú · ú 9 Monte-CarloZ O ` ¦ 6 x ¦ e H MCNP > í ß ï× ¼ [18]\ ¦ s 6 x # > í ß % i . MCNP > í ß

õ \ ¦ Fig. 3 \ ? /% 3 . s ï× ¼\ 6 x ô Ç é ß

&

h

É r JEF-3.1 _ ¨ î u \ ¦ s 6 x # > í ß ` ¦ Ù þ ¡ . z ´+ « >\

6 x ô Ç r « Ñ H Cs

2

O _ + þ AI Ð í ß è\ ¦ í < Êô Ç + þ AI s .

Õ

ª Q í ß è_ × æ$ í í S \ é ß & h É r 187µ barn Ü ¼ Ð B Ä º

± ú

Õ ª % ò ¾ Ó` ¦ : r z ´+ « >\ " f H Á ºr % i [19]. : r ½ ¨

\

" f % 3 # Q õ H ¸ \ -t % ò % i \ 5 g 2.8

% \ " f 54.8 %s 9, BGO Ø ¦ © u _

¹⁰

B r « Ñü <

¹³³

Cs r

« Ñ_ Ø ¦ ´ òÖ ¦ \ @ /ô Ç ¸ y y 0.5ü < 0.2 %s .

BGO Ø ¦ © u _ Ø ¦ ´ òÖ ¦ \ @ /ô Ç ¸ H

¹⁰

B(n, α) é ß

& h \ @ /ô Ç ¸ 2.4 %\ ¦ í < Ê 8 ú x ¸ 3.7\ " f

54.8 %\ ¦ ? /% 3 .

(5)

Table 4. The numerical data of the current measurement for the

¹³³

Cs(n, γ) reaction.

Energy(eV) Cross Section(barn) Error(barn) Energy(eV) Cross Section(barn) Error(barn)

1 3.27E-03 8.718E+01 3.011E+00 47 4.53E-02 2.393E+01 6.790E-01

2 3.46E-03 8.467E+01 2.847E+00 48 4.80E-02 2.320E+01 6.580E-01

3 3.66E-03 8.371E+01 2.755E+00 49 5.08E-02 2.268E+01 6.440E-01

4 3.88E-03 7.876E+01 2.556E+00 50 5.37E-02 2.223E+01 6.310E-01

5 4.11E-03 7.768E+01 2.466E+00 51 5.69E-02 2.152E+01 6.110E-01

6 4.36E-03 7.485E+01 2.347E+00 52 6.03E-02 2.100E+01 5.960E-01

7 4.61E-03 7.224E+01 2.238E+00 53 6.39E-02 2.058E+01 5.840E-01

8 4.88E-03 7.008E+01 2.145E+00 54 6.76E-02 1.997E+01 5.670E-01

9 5.17E-03 6.938E+01 2.108E+00 55 7.15E-02 1.943E+01 5.520E-01

10 5.46E-03 6.602E+01 1.990E+00 56 7.57E-02 1.912E+01 5.430E-01

11 5.79E-03 6.400E+01 1.910E+00 57 8.02E-02 1.835E+01 5.220E-01

12 6.14E-03 6.264E+01 1.860E+00 58 8.49E-02 1.791E+01 5.090E-01

13 6.50E-03 6.062E+01 1.792E+00 59 9.00E-02 1.728E+01 4.910E-01

14 6.87E-03 5.936E+01 1.748E+00 60 9.53E-02 1.686E+01 4.800E-01

15 7.27E-03 5.711E+01 1.675E+00 61 1.01E-01 1.622E+01 4.620E-01

16 7.70E-03 5.552E+01 1.620E+00 62 1.07E-01 1.583E+01 4.520E-01

17 8.16E-03 5.346E+01 1.558E+00 63 1.13E-01 1.546E+01 4.410E-01

18 8.64E-03 5.265E+01 1.528E+00 64 1.20E-01 1.501E+01 4.290E-01

19 9.15E-03 5.156E+01 1.493E+00 65 1.27E-01 1.448E+01 4.150E-01

20 9.68E-03 4.921E+01 1.424E+00 66 1.34E-01 1.406E+01 4.040E-01

21 1.03E-02 4.802E+01 1.386E+00 67 1.42E-01 1.364E+01 3.930E-01

22 1.09E-02 4.610E+01 1.329E+00 68 1.50E-01 1.350E+01 3.900E-01

23 1.15E-02 4.526E+01 1.302E+00 69 1.59E-01 1.308E+01 3.800E-01

24 1.22E-02 4.385E+01 1.260E+00 70 1.68E-01 1.305E+01 3.800E-01

25 1.29E-02 4.265E+01 1.224E+00 71 1.79E-01 1.251E+01 3.660E-01

26 1.36E-02 4.159E+01 1.191E+00 72 1.89E-01 1.193E+01 3.520E-01

27 1.44E-02 4.030E+01 1.153E+00 73 2.00E-01 1.169E+01 3.470E-01

28 1.53E-02 3.949E+01 1.129E+00 74 2.12E-01 1.156E+01 3.460E-01

29 1.62E-02 3.835E+01 1.096E+00 75 2.25E-01 1.129E+01 3.400E-01

30 1.71E-02 3.737E+01 1.067E+00 76 2.38E-01 1.110E+01 3.370E-01

31 1.81E-02 3.594E+01 1.026E+00 77 2.51E-01 1.052E+01 3.220E-01

32 1.92E-02 3.515E+01 1.002E+00 78 2.66E-01 1.065E+01 3.250E-01

33 2.04E-02 3.417E+01 9.740E-01 79 2.82E-01 1.039E+01 3.200E-01

34 2.16E-02 3.330E+01 9.480E-01 80 2.98E-01 9.961E+00 3.080E-01

35 2.28E-02 3.219E+01 9.160E-01 81 3.16E-01 9.764E+00 3.020E-01

36 2.42E-02 3.185E+01 9.060E-01 82 3.35E-01 9.320E+00 2.910E-01

37 2.56E-02 3.067E+01 8.720E-01 83 3.54E-01 9.172E+00 2.870E-01

38 2.71E-02 3.018E+01 8.580E-01 84 3.75E-01 8.866E+00 2.770E-01

39 2.87E-02 2.920E+01 8.300E-01 85 3.97E-01 8.935E+00 2.810E-01

40 3.04E-02 2.849E+01 8.090E-01 86 4.21E-01 8.539E+00 2.660E-01

41 3.22E-02 2.778E+01 7.890E-01 87 4.46E-01 8.396E+00 2.670E-01

42 3.40E-02 2.704E+01 7.680E-01 88 4.71E-01 8.047E+00 2.540E-01

43 3.60E-02 2.636E+01 7.490E-01 89 4.99E-01 8.027E+00 2.550E-01

44 3.82E-02 2.578E+01 7.320E-01 90 5.28E-01 7.726E+00 2.470E-01

45 4.04E-02 2.518E+01 7.150E-01 91 5.59E-01 7.935E+00 2.520E-01

46 4.28E-02 2.463E+01 6.990E-01 92 5.94E-01 7.720E+00 2.450E-01

(6)

Energy(eV) Cross Section(barn) Error(barn) Energy(eV) Cross Section(barn) Error(barn)

93 6.29E-01 7.327E+00 2.370E-01 139 5.36E+00 1.230E+02 3.738E+00

94 6.65E-01 7.194E+00 2.330E-01 140 5.47E+00 1.756E+02 5.590E+00

95 7.05E-01 7.046E+00 2.280E-01 141 5.53E+00 2.240E+02 7.489E+00

96 7.45E-01 7.105E+00 2.320E-01 142 5.65E+00 3.767E+02 1.102E+01

97 7.89E-01 6.778E+00 2.180E-01 143 5.78E+00 7.345E+02 2.245E+01

98 8.37E-01 6.686E+00 2.190E-01 144 5.87E+00 2.126E+03 6.454E+01

99 8.86E-01 6.607E+00 2.150E-01 145 5.95E+00 2.543E+03 7.770E+01

100 9.39E-01 6.633E+00 2.160E-01 146 6.03E+00 1.092E+03 3.316E+01

101 9.92E-01 6.411E+00 2.130E-01 147 6.12E+00 4.819E+02 1.484E+01

102 1.05E+00 6.330E+00 2.060E-01 148 6.18E+00 2.942E+02 9.914E+00

103 1.11E+00 6.023E+00 2.010E-01 149 6.25E+00 2.218E+02 6.986E+00

104 1.18E+00 6.095E+00 2.020E-01 150 6.36E+00 1.347E+02 4.175E+00

105 1.25E+00 6.025E+00 1.990E-01 151 6.47E+00 8.937E+01 2.979E+00

106 1.32E+00 6.109E+00 2.060E-01 152 6.53E+00 7.705E+01 3.001E+00

107 1.39E+00 5.999E+00 1.970E-01 153 6.58E+00 6.817E+01 2.707E+00

108 1.48E+00 5.889E+00 1.980E-01 154 6.65E+00 5.533E+01 1.966E+00

109 1.57E+00 5.852E+00 1.920E-01 155 6.75E+00 4.467E+01 1.643E+00

110 1.66E+00 6.163E+00 2.040E-01 156 6.84E+00 3.875E+01 1.463E+00

111 1.76E+00 5.895E+00 1.950E-01 157 6.91E+00 3.582E+01 1.961E+00

112 1.86E+00 5.924E+00 2.020E-01 158 7.10E+00 2.523E+01 8.260E-01

113 1.96E+00 6.099E+00 1.990E-01 159 7.30E+00 1.722E+01 1.164E+00

114 2.09E+00 6.073E+00 1.980E-01 160 7.52E+00 1.482E+01 5.250E-01

115 2.21E+00 6.191E+00 2.060E-01 161 7.74E+00 1.191E+01 1.347E+00

116 2.33E+00 6.406E+00 2.120E-01 162 7.97E+00 8.394E+00 3.500E-01

117 2.47E+00 6.023E+00 3.110E-01 163 8.20E+00 5.749E+00 8.820E-01

118 2.62E+00 6.431E+00 3.140E-01 164 8.44E+00 6.469E+00 2.970E-01

119 2.77E+00 6.516E+00 3.210E-01 165 8.79E+00 5.373E+00 3.400E-01

120 2.94E+00 6.942E+00 3.280E-01 166 8.95E+00 4.486E+00 5.220E-01

121 3.11E+00 7.506E+00 3.410E-01 167 9.07E+00 4.538E+00 4.420E-01

122 3.29E+00 8.094E+00 3.560E-01 168 9.21E+00 3.830E+00 3.810E-01

123 3.48E+00 8.930E+00 3.710E-01 169 9.35E+00 4.065E+00 4.510E-01

124 3.70E+00 1.040E+01 4.000E-01 170 9.45E+00 4.060E+00 5.490E-01

125 3.92E+00 1.166E+01 4.540E-01 171 9.63E+00 4.008E+00 3.030E-01

126 4.15E+00 1.453E+01 5.170E-01 172 1.00E+01 3.295E+00 2.150E-01

127 4.37E+00 1.804E+01 6.430E-01 173 1.06E+01 2.437E+00 1.880E-01

128 4.48E+00 1.989E+01 1.107E+00 174 1.12E+01 2.351E+00 1.870E-01

129 4.52E+00 1.979E+01 1.267E+00 175 1.18E+01 2.183E+00 2.210E-01

130 4.63E+00 2.522E+01 8.530E-01 176 1.21E+01 1.677E+00 3.090E-01

131 4.75E+00 3.068E+01 1.388E+00 177 1.25E+01 1.963E+00 1.870E-01

132 4.80E+00 3.479E+01 1.475E+00 178 1.38E+01 1.748E+00 1.140E-01

133 4.89E+00 3.772E+01 1.279E+00 179 1.49E+01 1.527E+00 3.070E-01

134 5.01E+00 4.768E+01 1.659E+00 180 1.53E+01 1.797E+00 2.120E-01

135 5.06E+00 5.305E+01 3.231E+00 181 1.59E+01 1.862E+00 1.730E-01

136 5.13E+00 6.401E+01 2.049E+00 182 1.68E+01 1.473E+00 1.630E-01

137 5.21E+00 7.334E+01 3.993E+00 183 1.78E+01 1.400E+00 1.560E-01

138 5.25E+00 8.467E+01 2.856E+00 184 1.88E+01 2.064E+00 1.630E-01

(7)

Energy(eV) Cross Section(barn) Error(barn) Energy(eV) Cross Section(barn) Error(barn)

185 1.99E+01 2.512E+00 1.690E-01 229 3.58E+01 1.087E+00 8.500E-02

186 2.11E+01 5.892E+00 2.530E-01 230 3.90E+01 9.419E-01 1.680E-01

187 2.18E+01 1.830E+01 1.184E+00 231 3.98E+01 1.036E+00 2.820E-01

188 2.19E+01 2.781E+01 1.527E+00 232 4.02E+01 7.137E-01 3.910E-01

189 2.20E+01 3.404E+01 2.260E+00 233 4.05E+01 1.215E+00 3.900E-01

190 2.20E+01 4.894E+01 2.868E+00 234 4.10E+01 1.003E+00 2.410E-01

191 2.21E+01 6.991E+01 2.914E+00 235 4.29E+01 1.612E+00 1.220E-01

192 2.22E+01 1.008E+02 4.731E+00 236 4.49E+01 2.416E+00 2.450E-01

193 2.23E+01 1.742E+02 6.323E+00 237 4.55E+01 3.708E+00 6.680E-01

194 2.24E+01 2.869E+02 1.163E+01 238 4.56E+01 5.395E+00 7.750E-01

195 2.24E+01 4.465E+02 1.763E+01 239 4.58E+01 6.721E+00 8.440E-01

196 2.25E+01 5.466E+02 2.149E+01 240 4.60E+01 6.615E+00 8.470E-01

197 2.25E+01 5.785E+02 2.255E+01 241 4.62E+01 8.833E+00 8.800E-01

198 2.26E+01 5.031E+02 1.724E+01 242 4.64E+01 1.140E+01 7.540E-01

199 2.27E+01 3.329E+02 1.329E+01 243 4.67E+01 2.129E+01 1.365E+00

200 2.28E+01 2.323E+02 9.621E+00 244 4.68E+01 3.411E+01 1.840E+00

201 2.29E+01 1.242E+02 4.709E+00 245 4.71E+01 8.061E+01 2.889E+00

202 2.29E+01 6.933E+01 3.658E+00 246 4.74E+01 2.029E+02 7.580E+00

203 2.30E+01 4.386E+01 2.068E+00 247 4.76E+01 4.515E+02 1.653E+01

204 2.31E+01 3.169E+01 2.178E+00 248 4.77E+01 5.075E+02 1.857E+01

205 2.32E+01 2.552E+01 1.929E+00 249 4.79E+01 2.393E+02 9.235E+00

206 2.33E+01 2.251E+01 1.827E+00 250 4.81E+01 8.342E+01 3.722E+00

207 2.33E+01 1.691E+01 1.526E+00 251 4.84E+01 2.853E+01 1.355E+00

208 2.34E+01 1.816E+01 1.557E+00 252 4.87E+01 1.500E+01 1.224E+00

209 2.35E+01 1.416E+01 1.029E+00 253 4.88E+01 1.097E+01 1.010E+00

210 2.36E+01 1.145E+01 1.270E+00 254 4.90E+01 7.326E+00 8.910E-01

211 2.36E+01 1.142E+01 1.223E+00 255 4.92E+01 5.889E+00 8.450E-01

212 2.37E+01 1.099E+01 1.270E+00 256 4.94E+01 4.743E+00 6.890E-01

213 2.38E+01 8.464E+00 1.189E+00 257 4.96E+01 3.878E+00 7.470E-01

214 2.39E+01 6.653E+00 7.510E-01 258 4.98E+01 4.245E+00 6.330E-01

215 2.39E+01 7.003E+00 9.650E-01 259 5.01E+01 3.269E+00 4.710E-01

216 2.40E+01 5.635E+00 9.880E-01 260 5.04E+01 2.940E+00 6.060E-01

217 2.41E+01 6.530E+00 1.029E+00 261 5.06E+01 2.977E+00 6.350E-01

218 2.41E+01 5.194E+00 1.030E+00 262 5.08E+01 2.998E+00 5.810E-01

219 2.42E+01 5.574E+00 9.770E-01 263 5.11E+01 2.900E+00 4.400E-01

220 2.43E+01 5.375E+00 6.950E-01 264 5.14E+01 2.650E+00 6.150E-01

221 2.48E+01 4.156E+00 2.530E-01 265 5.16E+01 2.403E+00 6.000E-01

222 2.56E+01 2.843E+00 2.660E-01 266 5.18E+01 2.215E+00 5.720E-01

223 2.66E+01 2.390E+00 1.940E-01 267 5.20E+01 2.553E+00 5.830E-01

224 2.81E+01 1.702E+00 1.670E-01 268 5.22E+01 2.649E+00 5.150E-01

225 2.97E+01 1.628E+00 1.470E-01 269 5.24E+01 1.374E+00 5.690E-01

226 3.13E+01 1.314E+00 1.590E-01 270 5.49E+01 1.487E+00 1.180E-01

227 3.24E+01 1.448E+00 2.130E-01 271 5.85E+01 1.982E+00 1.660E-01

228 3.30E+01 1.177E+00 3.960E-01 272 6.00E+01 2.018E+00 4.810E-01

185 1.99E+01 2.512E+00 1.690E-01 229 3.58E+01 1.087E+00 8.500E-02

186 2.11E+01 5.892E+00 2.530E-01 230 3.90E+01 9.419E-01 1.680E-01

(8)

IV. ¤X N Ë + s ÇÊ Ý õ m Í + s Ç Â ] Ø

« > è_ + þ A5 Å q l \ ¦ s 6 x ô Ç TOFZ O ` ¦ s 6 x # 0.003 eV \ " f 60 eV % ò % i \ s Ø Ô H

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_ z ´+ « > õ [ þ t É r s % ò % i \ " f F. Widder [12]_ õ ü

< Ju. P. Popov x 9 F. L. Shapiro [13]_ õ ü < \ P × æ$ í

% ò % i _ õ ë ß > r F ½ + É ÷ r s . Ju. P. Popov_ õ

&

h / B N" î ½ ¨ ¸ë ß ` ¦ Í Ç x% 3 . s õ H / B N" î % ò % i \

"

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: r ½ ¨_ õ F. Widder_ õ Ð H â ¾ Ó` ¦ Ð% i

. 5.9 eV(Fig. 4_ b)_ B Ä º H / B N" î \ " f H : r ½ ¨_

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\

¦ s 6 x ô Ç × æ$ í 5 Å q Ð H + þ A5 Å q l _ × æ$ í q '

r ç ß Z O (TOF-method)_ â Ä º Ð É r × æ$ í \ - t

ì r K 0 p x` ¦ t ¦ e 6 £ §` ¦ S X Ù þ ¡ . 9.5 eV(Fig. 4_ c) \ -t _ É r / B N" î É r : r z ´+ « >\ " f ' a8 £ ¤ ÷ &t · ú § ¤ .

Õ

ª Q 59.7 eV(Fig. 4_ d)_ / B N" î É r : r z ´+ « >\ " f ' a8 £ ¤

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Y

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[1] S. Y. Lee, J. Hori and M. Igashira, Journal of Nu- clear Science and Technology 36, 719 (1999).

[2] J. Tommasi, ibid., American Nuclear Society, La Grange Park, Illinois, p. 1252 (1993).

[3] T. Wakabayashi, Proc. of Int. Conf. Evaluation of Emerging Nucl. Fuel Cycle System: Global ’95, Ver- sailles, France, Sept.11-14, 1995, Commissariat a L’Energie Atomique, p. 800 (1995).

[4] J. L. Kloosterman and J. M. Li, ibid., Commissariat a l’Energie Atomique, p. 1106 (1995).

[5] J. Tommasi, Proc. of Int. Conf. on Future Nuclear System: Global ’97, Yokohama, Japan, Oct.5-10 (1997), Vol. 1, p. 224.

[6] D. D. Clayton, Principles of Stellar Evolution and Nucleosynthesis (Univ. of Chicago Press, Chicago, 1968).

[7] M. Busso and R. Gallino, Nuclear Physics A621, 431c (1997)

[8] C. Arlandini, M. Heil, R. Reifarth, F. K¨ appeler and P. V. Sedyshev, Nuclear Physics A688, 487c (2001).

[9] Samyol Lee, Sangbock Lee, Junghaeng Lee, Jung- min Lee, Jungran Yoon, Yonggi Min, Soonchul Jung, Taeik Ro, Guinyun Kim, Jun-ichi Hori, Shuji Yamamoto and Katsuhei Kobayashi, New Physics 49, 241 (2004).

[10] Jungran Yoon, Taeik Ro and Samyol Lee, New Physics 50, 224 (2005).

[11] Samyol Lee, New Physics 60, 338 (2010).

[12] F. Widder, Conf. Symp. on Neutr. Capt. Gamma Ray Spectrosc., Petten (1974), p. 265.

[13] Ju. P. Popov and F. L. Shapiro, Journal of Soviet Physics – JETP 15, 683 (1962).

[14] C. NORDBORG and M. SALVATORES, Proc. Intl Conf. Nuclear Data for Science and Technology, Gatlinberg, Tennessee, May 9-13, 1994 (American Nuclear Society, 1994), Vol. 2, p. 680.

[15] K. Shibata, T. Kawano, T. Nakagawa, O. Iwamoto, J. Katakura, T. Fukahori, S. Chiba, A. Hasegawa, T. Murata,H. Matsunobu, T. Ohsawa, Y. Nakajima, T. Yoshida, A. Zukeran, M. Kawai, M. Baba, M.

Ishikawa, T. Asami, T. Watanabe, Y. Watanabe,

M. Igashira, N. Yamamuro, H. Kitazawa, N. Ya-

mano and H. Takano, J. Nucl. Sci. Technol. 39, 1125

(2002).

(9)

[16] “ENDF-201, ENDF/B-VI Summary Documen- tation,” BNL-NCS-17541, MOD1 New evalua- tion (ENDF/B-VI) 4

^th

ed., P. F. ROSE, Ed., Brookhaven National Laboratory (1991); see also V. McLANE and MEMBERS OF THE CROSS SECTION WORKING GROUP ”ENDF-201 ENDF/B-VI Summary Documentation Supplement 1 ENDF/HE-VI Summary Documentation,” BNL NCS-17541, MOD3 Rev. 2 (ENDF/B-VI), Suppl.

1, 4

^th

ed., Brookhaven National Laboratory (1996).

[17] H. W. Schmitt, ORNL-2883, 1-28-60 (1960).

[18] F. J. Briesmeister (Ed.), MCNP-A General Monte Carlo Code for Neutron and Photon Transport, Ver- sion 4B, LA-12625-M, Los Alamos National Labo- ratory (1997).

[19] N. Wuest, H. Seyfarth and L. Aldea, Journal of

Physical Review 19, 1153 (1979).

Å  Ò ×ú n ÞV R Ë  Ò Å  Ò ×; c 6  X ¢  ë Å ì Å: g Õ Û( 133 Cs)8 ý ; c .U 8 ýÇ X Ø ú n ÞV R Ë  ºT    mì ÅX ì Ä  ¤X N Ë

1 Z 4, pp. 7∼15

 ì

Å  Ò ×ú n ÞV R Ë   Ò Å  Ò ×; c 6  X ¢  ë Å ì Å: g Õ Û( 133 Cs)8 ý ; c .U 8 ýÇ X Ø ú n ÞV R Ë  ºT    mì ÅX ì Ä  ¤X N Ë

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x " f@ / < Æ §  Ð| _ « Ñ> \ P  ~ ½ Ó    < Æõ , Â Òí ß  617-716

(2010¸  11 Z 4 23{ 9  ~ Ã Î6 £ §, 2010¸  12 Z 4 20{ 9  Ã º& ñ  : r ~ Ã Î6 £ §, 2011¸  1 Z 4 17{ 9  > F  S X & ñ )

Cs(n, γ) ì ø Í6 £ x \  @ /ô  Ç ×  æ$ í   í S \  é ß   & h `  ¦ \  -t  0.003 eV\ " f 60 eV\    5 g 8 £ ¤& ñ % i  .  : r



 ½ ¨\   6 x ) a ×  æ$ í    H  § Ð@ / < Æ § " é ¶   Ðz ´+ « > è_  46-MeV      + þ A5 Å q l \ " f_      F gÙ þ ì ø Í6 £ x

` 

¦ :  x K  µ 1 ÏÒ q t ) a ×  æ$ í  s  ¦ TOF ~ ½ ÓZ O Ü ¼ Ð % 3 % 3  . Bi

Ge

O

(BGO) $ 3 F g ^  Ð ½ ¨$ í  ) a 12 > h_    \ 



-t  f  ¨ Ã º  Ø  ¦  © u  Ð

Cs(n, γ) ì ø Í6 £ x Ü ¼ ÐÂ Ò'   ¸  H 7 £ ¤ µ 1 Ïy     `  ¦ 8 £ ¤& ñ % i  ¦, s    Ø  ¦  © u   H ×  æ

$ í

  Ò q t$ í ³ ð& h Ü ¼ ÐÂ Ò'   o  12.7 ± 0.02 m 0 Au \  [ O u  % i  . r « Ñ\  { 9  ÷ &  H ×  æ$ í     5 Å q`  ¦ ½ ¨

l  0 AK 

B r « Ñ_ 

B(n, αγ)

Li ì ø Í6 £ x`  ¦ s 6 x % i  ¦, ×  æ$ í     5 Å q _    o\  ¦ y  r  l  0 AK  ×  æ$ í



   5 Å q ×  æ ç ß \  BF

  Ø  ¦ l \  ¦ [ O u  % i  . l  > r _ 

Cs(n, γ) ì ø Í6 £ x é ß   & h 8 £ ¤& ñ   õ   H & ñ x 9  ¸ ± ú 



É r Lead-Slowing Down Spectrometer  Ð 8 £ ¤& ñ  ) a Ju. P. Popov ü < F. Widder_    õ ÷  r s % 3 Ü ¼ 9,  : r  

½

¨\  ¦ :  x #   Ð  & ñ S X  ô  Ç z ´+ « >  õ \  ¦ % 3 % 3  . % 3 # Q    õ   H > í ß \  _ ô  Ç JENDL3.3, ENDF/B-VI x 9

JEF-3.1_  ¨ î   õ ü < q  § % i  .

Ù þ

d  # Q:

Cs, ×  æ$ í  ,  í S \ , TOF, BGO  Ø  ¦ l , é ß   & h

A Study on the Energy-dependent Neutron-capture Cross-section of Natural Cesium( 133 Cs) by Using a Continuous Neutron Flux

Jungran Yoon

Department of New Material Physics, Dong-A University, Pusan 604-714

Samyol Lee ∗

Department of Radiological Science, Dongseo University, Pusan 617-716 (Received 23 November 2010 : revised 20 December 2010 : accepted 17 January 2011)

The neutron-capture cross section of natural cesium (

Cs) has been measured in the energy region from 0.003 eV to 60 eV by using the neutron time-of-flight (TOF) method with a 46-MeV electron linear accelerator (linac) at the Research Reactor Institute, Kyoto University (KURRI). An assembly of Bi

Ge

O

B powder sample and the

B(n, α γ) standard cross section were used. The previous experimental data (Ju. P. Popov and F. Widder) and the evaluated data in JENDL-3.3, ENDF/B VI and JEF-3.1 were compared to the current measurement.

PACS numbers: 24.30.-V

Keywords:

Cs, Neutron, Capture, TOF, BGO, Cross-section

E-mail: [email protected]

-7-

I. " e Â ] Ø

×

 æ$ í   í S \  é ß   & h  É r Ù þ ½ ¨ ¸ > í ß \   9 כ ¹ô  Ç ×  æ כ ¹ô  Ç X <

s

' \  ¦ ] j/ B N l  ¸  9 [1], ×  æ$ í   ` Ó ü t \  @ /ô  Ç > í ß 

\

 e  # Q" f ¸ ×  æ כ ¹ô  Ç l  í X <s '   ) a .  & ³F   Ö ¸ µ 1 Ïy   

½

¨   '  ÷ & ¦ e    H  ¦5 Å q 7 £ xd   Ð(FBR: Fast Breeder Re- actor) ü < 5 Å q l  ½ ¨1 l x  Ð(ADSR: Accelerator Driven Sys- tem Reactor) _   ¸d  [ O > , ` [ O >  x 9 " é ¶   Ð \ P Ø  ¦§ 4 >  í

ß r   9 כ ¹ô  Ç l  í X <s '  Ð ¸  6 x ÷ &# Q   [2–5]. " é ¶  



Ð\ " f Ò q t$ í ÷ &  H ~ ½ Ó $ í ` l Ó ü t % o \  e  # Q" f

Cs _ 

×

 æ$ í   í S \  é ß   & h  É r B Ä º ×  æ כ ¹ô  Ç Ó ü t o | ¾ Ó î  r X <    X

<

Cs(n, γ)

Cs ì ø Í6 £ x _  \ P ×  æ$ í   í S \  é ß   & h  É r    28 barn Ü ¼ Ð q  §& h  H ¼ # \  5 Å q #   ¸d  _  $ í 0 p x`  ¦   or  v

  H " é ¶   s  ÷ &l  ¸ ô  Ç . ÷  r ë ß   m   Ä ºÅ ÒÓ ü t o \   ½ Ó

$ í

? /Â Ò\ " f_  " é ¶  è½ + Ë$ í õ & ñ ×  æ s- x 9 r-process_   ¸4 S q

>

Å Ò ×ú n ÞV R Ë Ò Å Ò ×; c 6 X ¢ ë Å ì Å: g Õ Û( 133 Cs)8 ý ; c .U 8 ýÇ X Ø ú n ÞV R Ë ºT mì ÅX ì Ä ¤X N Ë

ì

Å Ò ×ú n ÞV R Ë Ò Å Ò ×; c 6 X ¢ ë Å ì Å: g Õ Û( ¹³³ Cs)8 ý ; c .U 8 ýÇ X Ø ú n ÞV R Ë ºT mì ÅX ì Ä ¤X N Ë

× <+ ä ¸ 6 Ò

x @ / < Æ § õ < Æ@ / < Æ èF Ó ü t o < Æõ , Â Òí ß 604-714

~ x

x " f@ / < Æ § Ð| _ « Ñ> \ P ~ ½ Ó < Æõ , Â Òí ß 617-716

(2010¸ 11 Z 4 23{ 9 ~ Ã Î6 £ §, 2010¸ 12 Z 4 20{ 9 Ã º& ñ : r ~ Ã Î6 £ §, 2011¸ 1 Z 4 17{ 9 > F S X & ñ )

Cs(n, γ) ì ø Í6 £ x \ @ /ô Ç × æ$ í í S \ é ß & h ` ¦ \ -t 0.003 eV\ " f 60 eV\ 5 g 8 £ ¤& ñ % i . : r

½ ¨\ 6 x ) a × æ$ í H § Ð@ / < Æ § " é ¶ Ðz ´+ « > è_ 46-MeV + þ A5 Å q l \ " f_ F gÙ þ ì ø Í6 £ x

`

¦ : x K µ 1 ÏÒ q t ) a × æ$ í s ¦ TOF ~ ½ ÓZ O Ü ¼ Ð % 3 % 3 . Bi

(BGO) $ 3 F g ^ Ð ½ ¨$ í ) a 12 > h_ \

-t f ¨ Ã º Ø ¦ © u Ð

Cs(n, γ) ì ø Í6 £ x Ü ¼ ÐÂ Ò' ¸ H 7 £ ¤ µ 1 Ïy ` ¦ 8 £ ¤& ñ % i ¦, s Ø ¦ © u H × æ

Ò q t$ í ³ ð& h Ü ¼ ÐÂ Ò' o 12.7 ± 0.02 m 0 Au \ [ O u % i . r « Ñ\ { 9 ÷ & H × æ$ í 5 Å q` ¦ ½ ¨

l 0 AK

B r « Ñ_

Li ì ø Í6 £ x` ¦ s 6 x % i ¦, × æ$ í 5 Å q _ o\ ¦ y r l 0 AK × æ$ í

5 Å q × æ ç ß \ BF

Ø ¦ l \ ¦ [ O u % i . l > r _

Cs(n, γ) ì ø Í6 £ x é ß & h 8 £ ¤& ñ õ H & ñ x 9 ¸ ± ú

É r Lead-Slowing Down Spectrometer Ð 8 £ ¤& ñ ) a Ju. P. Popov ü < F. Widder_ õ ÷ r s % 3 Ü ¼ 9, : r

¨\ ¦ : x # Ð & ñ S X ô Ç z ´+ « > õ \ ¦ % 3 % 3 . % 3 # Q õ H > í ß \ _ ô Ç JENDL3.3, ENDF/B-VI x 9

JEF-3.1_ ¨ î õ ü < q § % i .

d # Q:

Cs, × æ$ í , í S \ , TOF, BGO Ø ¦ l , é ß & h

A Study on the Energy-dependent Neutron-capture Cross-section of Natural Cesium( ¹³³ Cs) by Using a Continuous Neutron Flux

Samyol Lee ^∗

æ$ í í S \ é ß & h É r Ù þ ½ ¨ ¸ > í ß \ 9 כ ¹ô Ç × æ כ ¹ô Ç X <

' \ ¦ ] j/ B N l ¸ 9 [1], × æ$ í ` Ó ü t \ @ /ô Ç > í ß

e # Q" f ¸ × æ כ ¹ô Ç l í X <s ' ) a . & ³F Ö ¸ µ 1 Ïy

¨ ' ÷ & ¦ e H ¦5 Å q 7 £ xd Ð(FBR: Fast Breeder Re- actor) ü < 5 Å q l ½ ¨1 l x Ð(ADSR: Accelerator Driven Sys- tem Reactor) _ ¸d [ O > , ` [ O > x 9 " é ¶ Ð \ P Ø ¦§ 4 > í

ß r 9 כ ¹ô Ç l í X <s ' Ð ¸ 6 x ÷ &# Q [2–5]. " é ¶

Ð\ " f Ò q t$ í ÷ & H ~ ½ Ó $ í ` l Ó ü t % o \ e # Q" f

Cs _

æ$ í í S \ é ß & h É r B Ä º × æ כ ¹ô Ç Ó ü t o | ¾ Ó î r X < X

Cs ì ø Í6 £ x _ \ P × æ$ í í S \ é ß & h É r 28 barn Ü ¼ Ð q §& h H ¼ # \ 5 Å q # ¸d _ $ í 0 p x` ¦ or v

H " é ¶ s ÷ &l ¸ ô Ç . ÷ r ë ß m Ä ºÅ ÒÓ ü t o \ ½ Ó

? /Â Ò\ " f_ " é ¶ è½ + Ë$ í õ & ñ × æ s- x 9 r-process_ ¸4 S q

í ß \ × æ כ ¹ô Ç כ ¹ è Ð+ 6 x ) a [6–8]. " f $ [ þ t

É

r § Ð@ / < Æ § " é ¶ Ð z ´+ « > è_ 46-MeV + þ A5 Å q l

\ " f µ 1 ÏÒ q t÷ & H × æ$ í \ ¦ s 6 x # \ P × æ$ í ÐÂ Ò' Ã º z

eV_ \ -t % ò % i \ @ /ô Ç × æ$ í í S \ é ß & h ` ¦ Ã º¸

5 g 8 £ ¤& ñ K ¸ ¦ e [9–11]. : r ½ ¨\ " f À Ò ¦ e

H \ P × æ$ í % ò % i \ " f 60 eV\ s Ø Ô H \ -t # 3 0 A

" f_

Cs(n, γ) ì ø Í6 £ x \ @ /ô Ç é ß & h É r Fig. 1 õ Table 1 \ " f · p כ õ ° ú s " é ¶ Ð\ " f µ 1 ÏÒ q t ) a × æ$ í \ ¦ s 6

x ô Ç כ Ü ¼ Ð 5 Å q ¸ Z > l _ TOF(Time-of-Flight) ~ ½ ÓZ O ` ¦ s

6 x # 8 £ ¤& ñ ô Ç F. Widder_ õ e t ë ß 5.9 eV/ B N" î

¦ Ø æì r y F & ³ t 3 l w ¦ e 6 £ §` ¦ · ú Ã º e . ¢ ¸ô Ç 5.9 eV Å Ò/ B N" î Â Òì r \ H × æ$ í \ -t ì r K 0 p x s ± ú É r Ju. P.

Popov x 9 F. L. Shapiro_ õ \ ¦ í < Êô Ç \ P × æ$ í % ò % i _

õ [ þ t ë ß > r F ½ + É ÷ r % ò % i \ " f H 8 £ ¤& ñ õ > r F

t · ú § H . Õ ªo ¦ Popov_ õ H SLODT(Slowing Down Time) Detector © u \ ¦ s 6 x ô Ç כ Ü ¼ Ð \ -t ì r K

0 p x s ± ú ¨ î ç H í S \ é ß & h _ õ ë ß ` ¦ ] j/ B N ô Ç . [12, 13] s ü < ° ú s × æ$ í í S \ 8 £ ¤& ñ õ [ þ t s \ P × æ$ í % ò % i

" f keV \ -t % ò % i \ 5 g" f 8 £ ¤& ñ X <s ' _ ª õ | 9 s

p f ¨ ¦ f 8 £ ¤& ñ ÷ &t 3 l w ô Ç \ -t ½ ¨ç ß ¸ e Ü ¼ 9, 8

£ ¤& ñ _ & ñ x 9 ¸ ¸ ë ß 7 á ¤ Û ¼X O t 3 l w ô Ç כ s & ³z ´s . ¨ î

)

a õ Ð H Å Ò Ð Ù þ ì r\ P õ Ö 6 x ½ + Ë\ ' aº ) a X <s ' \ ¦ ¨ î

H JEF-3.1, ENDF/B-VI, JENDL-3.3 [14–16] _ õ

e Ü ¼ : r ½ ¨_ õ & ñ S X ô Ç / B N" î ` ¦ F & ³ ¦ e t

3 l w < Ê` ¦ · ú Ã º e % 3 . " f

Cs(n, γ) ì ø Í6 £ x \ @ /ô Ç

ñ S X ô Ç × æ$ í í S \ é ß & h É r # Q t s Ä »\ " f ] X z ´y כ

¹½ ¨÷ & ¦ e H © S ! s .

: r ½ ¨ H { 9 : r § Ð@ / < Æ " é ¶ Ðz ´+ « > è_ y © § 4 ô Ç ` O Û ¼ + þ

AI _ 46-MeV + þ A 5 Å q l Ð 5 Å q ) a \ ¦ s 6 x

# Ta ³ ð& h Ü ¼ ÐÂ Ò' _ F gÙ þ ì ø Í6 £ x` ¦ { 9 Ü ¼& µ 1 ÏÒ q t ) a × æ

\ ¦ s 6 x K , × æ$ í q ' r ç ß (Time-of-flight)Z O x 9

-t f ¨ Ã º+ þ A 12> h_ BGO(Bi

) $ 3 F g Ø ¦ l

Ð, \ -t 0.003 eV\ " f 60 eV\ s Ø Ô H × æ$ í \ @ / ô

Ç

Cs _ × æ$ í í S \ é ß & h ` ¦ 8 £ ¤& ñ % i . : r ½ ¨\

f % 3 # Q õ H l > r _ F. Widder [1]_ 8 £ ¤& ñ õ x 9

° ú כ[ þ t õ q § % i . ¢ ¸ô Ç, % 3 # Q õ H 0 A\ " f /

L ô Ç # Q ì r \ " f Ä »6 x > 6 x| ¨ c כ Ü ¼ Ð l @ /÷ & 9,

æ$ í í S \ é ß & h ` ¦ 8 £ ¤& ñ H l Õ ü t õ K $ 3 ~ ½ ÓZ O É r Ù þ Ó ü t o