127 I8 ý ; c .U 8 ý Ç X Ø ú n ÞV R Ë ºT mì ÅX ì Ä ¤X N Ë

(1)

127 I8 ý ; c .U 8 ý Ç X Ø ú n ÞV R Ë ºT mì ÅX ì Ä ¤X N Ë

*

× <+ ä ¸ 6 Ò · { ¡? ¸

1 l

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

T ~ x ^∗

z

Â Ò@ / < Æ § ~ ½ Ó < Æõ , F g Å Ò 506-824 (2005¸ 3 Z 4 8{ 9 ~ Ã Î6 £ §)

127

I(n,γ)

¹²⁸

ì ø Í6 £ x \ @ /ô Ç × æ$ í í S \ é ß & h ` ¦ 46-MeV + þ A5 Å q l \ ¦ s 6 x # × æ$ í TOF ~ ½ ÓZ O Ü ¼ Ð, \ -t % ò % i 0.003 eV\ " f 100 eV\ 5 g 8 £ ¤& ñ % i . : r ½ ¨\ " f H 12 > h_ Bi

4

Ge

3

O

12

(BGO) $ 3 F g ^ Ð ½ ¨$ í ) a \ -t f ¨ Ã º Ø ¦ © u Ð

¹²⁷

I(n,γ)

¹²⁸

ì ø Í6 £ x Ü ¼ ÐÂ Ò' ¸ H y

` ¦ 8 £ ¤& ñ % i ¦, Ø ¦ l © 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 ÷ &% 3 .

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 × æç ß \ BF

³

Ø ¦ l \ ¦ [ O u Ù þ ¡ . % 3 # Q

¹²⁷

I(n,γ)

¹²⁸

ì ø Í6 £ x é

ß

& h _ 8 £ ¤& ñ õ H s _ z ´+ « >\ _ ô Ç 8 £ ¤& ñ õ [ þ t x 9 ENDF/B-VI, JENDL-3.3 x 9 JEF-2.2_

¨ î

) a ° ú כ[ þ t õ q § x 9 Ð % i .

PACS numbers: 24

Keywords:

¹²⁷

I, × æ$ í , í S \ , TOF, BGO, é ß & h

I. " e Â ] Ø

127

I(n,γ)

¹²⁸

ì ø Í6 £ x \ @ /ô Ç é ß & h É r Ù þ ½ ¨ ¸ > í ß \ 9 כ ¹ ô

Ç × æ כ ¹ô Ç X <s ' \ ¦ ] j/ B N ô Ç . [1] ¢ ¸ô Ç & 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 l í X <s ' Ð 6 x ÷ &# Q . [2–5] : £ ¤ y " é ¶ Ð

\

" f Ò q t$ í ÷ & H ~ ½ Ó $ í ` l Ó ü t % o \ e # Q" f © Ã º" î Ù þ ì

r\ P ¼ # (LLFP: Long-Lived Fission Products)[ þ t

⁹⁰

Sr,

99

Tc,

¹²⁹

I,

¹³⁵

Cs,

¹³⁷

Cs[ þ t \ @ /ô Ç ½ ¨\ e # Q" f

¹²⁹

I_

èY > % o õ & ñ × æ

¹²⁹

IÙ þ ì r\ P ¼ # \ í < Ê÷ &# Q e H

¹²⁷

I_

×

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 < s

. ¢ ¸ô Ç " é ¶ Ð_ ¦ è Ù þ " é ¶ « Ñ × æ \ ë ß [ þ t # Qt H © Ã

º" î " é ¶ Ù þ ì r\ P Ò q t$ í Ó ü t(LLFP) Ù þ 7 á x_ èY > ` ¦ 3 l q& h Ü ¼

Ð ô Ç Ù þ ¨ 8 l Õ ü t_ ½ ¨ > hµ 1 Ï\ e # Q" f Ù þ ì r\ P Ã ºÖ ¦ s

H B) " é ¶ è Ù þ 7 á x_ & ñ S X ô Ç × æ$ í í S \ é ß & h É r × æ כ

¹ . ÷ rë ß m Ä ºÅ ÒÓ ü t o \ e # Q" f 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 ¹ ô

Ç כ ¹ è Ð+ 6 x ) a . [6–8]

∗

E-mail: [email protected]

0 Aü < ° ú É r s Ä »\ " f & ñ S X ô Ç × æ$ í í S \ X <s ' \ ¦ 8 £ ¤

&

ñ H כ É r B Ä º × æ כ ¹ . Õ ª Q y Ù þ 7 á x \ @ /ô Ç × æ

$ í

í S \ õ [ þ t É r \ 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 wô Ç Ù þ 7 á x ¸ ´ ú §Ü ¼ 9, 8½ ¨ , 8 £ ¤& ñ _ & ñ x 9 ¸ ¸ ë ß 7

á

¤ Û ¼X O t 3 l wô Ç כ s & ³z ´s . Fig. 1õ Table 1\ " f

· p כ õ ° ú s

¹²⁷

I \ @ /ô Ç l > r_ × æ$ í í S \ é ß & h

É

r \ P × æ$ í í S \ é ß & h ` ¦ ] jü @ ¦ H 10 eV s © \ " f Â

Ò' 8 £ ¤& ñ ô Ç Popov [9]_ õ Â Òs . s Popov_

õ H Lead Slowing-down Spectrometer ~ ½ ÓZ O Ü ¼ Ð 8 £ ¤& ñ ô

Ç כ Ü ¼ Ð, / B N" î \ -t % ò % i \ " f_ \ -t ì r K 0 p x s ©

© y b # Q4 R ¨ î ) a ° ú כ[ þ t õ / B N" î \ -t Â Òì r \ " f © { © ô Ç

s \ ¦ Ðs ¦ e Ü ¼Ù ¼ Ð s % ò % i \ @ /ô Ç & ñ S X ô Ç 8 £ ¤& ñ s כ

¹½ ¨ ) a . ¢ ¸ô Ç \ P × æ$ í í S \ é ß & h É r 6.2 barn [10] Ü ¼

Ð+ q §& h p u \ ¸ Ô ¦ ½ ¨ ¦ Õ ª X <s ' _ ª õ | 9 É r p f

¨ 9, s õ [ þ t ¸ ¸ # 3 0 A ? /\ " f { 9 ' a$ í e H ° ú כ[ þ t

`

¦ ] jr t 3 l w ¦ e . ÷ rë ß m , + þ A5 Å q l

\

_ ô Ç F gÙ þ ì ø Í6 £ x \ " f µ 1 ÏÒ q t÷ & H × æ$ í \ ¦ s 6 xô Ç × æ$ í

í S \ õ H \ O H z ´& ñ s . " f

¹²⁷

I \ @ /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 ¹

½

¨÷ & ¦ e H © S ! s .

0 Aü < ° ú É r s Ä »\ " f : r ½ ¨ H { 9 : r § Ð@ / < Æ " é ¶ Ð z

´+ « > è_ y © § 4 ô Ç ` O Û ¼ + þ AI _ 46-MeV + þ A

-224-

(2)

Table 1. Experiments in the Previous Thermal Measurements for the

¹²⁷

I(n,γ)

¹²⁸

I Reaction

Quantity Neutron Capture

Results Year Method

Cross Section Seren, L. et al. [11] 1947 Activation and β-ray counting 6.25 ± 1.25

Pomerance, H. [12] 1951 Pile oscillator method 6.1 ± 0.3

Grimeland, B. [13] 1952 NaI (target & detector) 5.03

Tattersall, R. B., et al. [14] 1960 Pile oscillator method 6.6 ± 0.3 Jozefowicz. E. T. [15] 1963 Activation and β-ray counting 5.8 ± 0.2 Robertson, J. C. [16] 1965 CsI (target & detector) 6.17 ± 0.2

Ryves, T. B. [17] 1970 Activation and β-ray counting 6.12 ± 0.12

Mughabghab, S., et al. [18] 1981 Evaluated value 6.2

JENDL-3.3 [10] 2002 Evaluated value 6.200

ENDF/B-VI [19] 1996 Evaluated value 6.23164

JEF-2.2 [20] 1994 Evaluated value 6.19313

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 4µ/ch

time-of-flight Full channel number 4096 ch

5 Å

q l Ð 5 Å q ) a \ ¦ s 6 x # Ta³ ð& h Ü ¼ ÐÂ Ò' _ F g Ù þ

ì ø Í6 £ x` ¦ { 9 Ü ¼& µ 1 ÏÒ q t ) a × æ$ 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 % ò % i 0.003 ∼ 100 eV \ s Ø Ô H × æ$ í \ @ /ô Ç

¹²⁷

I_ × æ$ í í S \ é ß

&

h ` ¦ 8 £ ¤& ñ % i . r « Ñ\ { 9 ÷ & H × æ$ í 5 Å q` ¦ 8 £ ¤& ñ

l 0 AK " f

¹⁰

B_

¹⁰

B(n,αγ) ì ø Í6 £ x` ¦ s 6 x % i . : £ ¤ y , 10 eV s \ " f_ × æ$ í í S \ é ß & h É r \ P × æ$ í í S \

Fig. 1. The evaluated data of ENDF/B-VI, JENDL- 3.3, JEF-2.2 and the previous measurement data for the

127

I(n,γ)

¹²⁸

I Reaction

é

ß & h ` ¦ ] jü @ ¦ H : r ½ ¨\ " f % 6 £ § Ü ¼ Ð 8 £ ¤& ñ ` ¦ r

¸ % i .

: r ½ ¨\ " f % 3 # Q õ H l > r_ Popov [9]_ 8 £ ¤& ñ

õ x 9 ¨ î ° ú כ[ þ t õ q § . ÷ rë ß m , % 3 # Q õ

H 0 A\ " f / å Lô Ç # Q ì r \ " f Ä »6 x > 6 x ÷ &# Q| 9

כ

Ü ¼ Ð l @ /÷ & 9, : £ ¤ y × 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. 46-MeV ¹ Å Ò Å] k ù Ò ×M õ m Í ß e È û s ÚM

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

+ þ A5 Å q l (Linac)ü < \ -t f ¨ Ã º Ø ¦ l 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. Experimental arrangement for the capture cross

section measurement

(3)

Fig. 2 \ ? /% 3 ¦, z ´+ « >\ 6 x ÷ &# Q × 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 × æç ß \ BF

³

Ø ¦ l \ ¦ [ O u Ù þ ¡ . z ´+ « >~ ½ ÓZ O x 9 © u

\ @ /ô Ç © [ jô Ç ? /6 x É r : r ½ ¨\ " f · ú ¡" f

¹⁸¹

Ta(n,γ)ì ø Í 6

£

x \ @ /ô Ç Ð ¦ô Ç 7 Hë H \ Ð ¦÷ &% 3 . [21] + þ A5 Å q l

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

? /% 3 .

2. ¤X N ËS z »

×

æ$ í í S \ z ´+ « >\ 6 x ÷ &# Q r « Ñ_ ] j" é ¶ É r Table 3 \ ? /% 3 .

¹²⁷

I_ ì r´ ú r « Ñ H ¿ ºa 0.1 mm_ AlF K 5

Å

q ó ø ÍÜ ¼ Ð ë ß [ þ t # Q © \ V , # Q& . 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 × æí ß ê ø Í´ ò õ

\ ¦ ¦ 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 qó 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 _ × æd Â Òì r \ [ O u % i .

∗

¹⁰

B_ F K5 Å qì r´ ú É r 0.1 mm ¿ ºa _ AlF K5 Å qó ø ÍÜ ¼ Ð ë ß [

þ

t # Q © \ [ þ t # Qe .

∗

¹⁰

B : 96.98 %,

¹¹

B : 3.02 %

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 Ó Ø

¦ 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) ` ¦ Ð : r r « Ñ\ _ ô Ç × æ$ í í S \ Ö ¦

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

Sample

¹²⁷

I

¹⁰

B

^∗

Physical form Metal plate Metal powder Chemical purity(%) 99.9 99.999 Isotopic composition(%) Natural 96.98

Weight of sample(g) 2.72 2.92 Thickness of sample(cm) 0.3 0.8

(Atoms/kb) 2.82 52.42

Size of sample (cm

²

) 1.8 × 1.8 1.8 × 1.8

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 & ³

½ +

É Ã º e .

φ(E) = C

_B

(E)/ε

_B

/Y

_B

(E) = C

_B

(E)/ε

_B

(1)

: r ½ ¨\ " f 6 x ÷ &# Q 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 £ ¤ Ð : r_ × 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

¹²⁷

I 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 & ³

½ +

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 . [22]

Y

S

(E) = (1 − exp(−Nσ

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 × æí 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 JENDL-3.3 [10]_ \ P × æ$ í í S \ é ß & h 6.2

barn \ ½ © o % i .

(4)

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

¹²⁷

I(n,γ)

¹²⁸

I reaction

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

1 3.140E-03 1.678E+01 5.160E-01 51 1.945E+01 3.319E+00 3.420E-01

2 4.250E-03 1.513E+01 4.150E-01 52 1.954E+01 2.816E+00 3.170E-01

3 5.350E-03 1.349E+01 3.520E-01 53 1.964E+01 4.543E+00 3.810E-01

4 6.720E-03 1.190E+01 3.020E-01 54 1.974E+01 6.099E+00 4.430E-01

5 8.440E-03 1.064E+01 2.660E-01 55 1.983E+01 7.218E+00 5.090E-01

6 1.061E-02 9.454E+00 2.340E-01 56 1.993E+01 1.186E+01 6.180E-01

7 1.334E-02 8.462E+00 2.080E-01 57 2.003E+01 2.084E+01 8.700E-01

8 1.676E-02 7.595E+00 1.860E-01 58 2.013E+01 3.693E+01 1.341E+00

9 2.106E-02 6.804E+00 1.660E-01 59 2.023E+01 7.525E+01 2.429E+00

10 2.648E-02 6.058E+00 1.480E-01 60 2.033E+01 1.311E+02 4.062E+00

11 3.328E-02 5.467E+00 1.330E-01 61 2.043E+01 1.659E+02 5.080E+00

12 4.182E-02 4.932E+00 1.200E-01 62 2.053E+01 1.244E+02 3.866E+00

13 5.258E-02 4.476E+00 1.090E-01 63 2.063E+01 6.343E+01 2.110E+00

14 6.605E-02 4.026E+00 9.800E-02 64 2.079E+01 1.977E+01 6.920E-01

15 8.305E-02 3.626E+00 8.800E-02 65 2.100E+01 6.963E+00 3.460E-01

16 1.044E-01 3.225E+00 7.900E-02 66 2.121E+01 4.289E+00 2.830E-01

17 1.312E-01 2.849E+00 7.000E-02 67 2.140E+01 2.566E+00 2.540E-01

18 1.649E-01 2.543E+00 6.400E-02 68 2.173E+01 2.110E+00 1.440E-01

19 2.074E-01 2.249E+00 5.900E-02 69 2.245E+01 1.587E+00 1.000E-01

20 2.604E-01 1.984E+00 5.400E-02 70 2.345E+01 1.485E+00 9.500E-02

21 3.268E-01 1.820E+00 5.100E-02 71 2.458E+01 1.480E+00 9.000E-02

22 4.106E-01 1.585E+00 4.600E-02 72 2.583E+01 1.453E+00 8.900E-02

23 5.165E-01 1.384E+00 4.100E-02 73 2.702E+01 1.983E+00 1.140E-01

24 6.507E-01 1.198E+00 3.700E-02 74 2.797E+01 2.704E+00 1.500E-01

25 8.183E-01 1.112E+00 3.500E-02 75 2.854E+01 3.013E+00 2.110E-01

26 1.028E+00 1.031E+00 3.300E-02 76 2.880E+01 3.612E+00 3.110E-01

27 1.291E+00 8.412E-01 2.900E-02 77 2.901E+01 4.625E+00 2.790E-01

28 1.625E+00 8.228E-01 2.900E-02 78 2.922E+01 4.454E+00 3.320E-01

29 2.039E+00 7.132E-01 2.700E-02 79 2.936E+01 5.453E+00 4.850E-01

30 2.568E+00 6.773E-01 2.500E-02 80 2.949E+01 5.572E+00 3.640E-01

31 3.244E+00 5.747E-01 4.900E-02 81 2.971E+01 7.752E+00 3.680E-01

32 3.969E+00 5.655E-01 4.900E-02 82 2.993E+01 9.933E+00 4.860E-01

33 4.850E+00 5.010E-01 4.700E-02 83 3.007E+01 1.227E+01 7.210E-01

34 5.921E+00 5.365E-01 4.400E-02 84 3.016E+01 1.447E+01 8.060E-01

35 7.228E+00 5.697E-01 4.300E-02 85 3.029E+01 1.714E+01 6.840E-01

36 8.784E+00 5.410E-01 4.200E-02 86 3.048E+01 2.267E+01 8.040E-01

37 9.809E+00 5.514E-01 8.700E-02 87 3.066E+01 3.420E+01 1.114E+00

38 1.020E+01 1.859E+00 1.130E-01 88 3.090E+01 6.483E+01 1.825E+00

39 1.045E+01 2.630E+00 2.530E-01 89 3.114E+01 2.438E+02 7.082E+00

40 1.075E+01 7.839E-01 8.300E-02 90 3.128E+01 7.073E+02 2.345E+01

41 1.200E+01 5.206E-01 4.200E-02 91 3.138E+01 6.193E+02 2.064E+01

42 1.351E+01 8.518E-01 6.800E-02 92 3.147E+01 3.348E+02 1.110E+01

43 1.461E+01 6.875E-01 6.100E-02 93 3.157E+01 1.782E+02 6.091E+00

44 1.641E+01 7.873E-01 4.800E-02 94 3.172E+01 8.773E+01 2.706E+00

45 1.790E+01 9.656E-01 9.900E-02 95 3.187E+01 4.750E+01 1.884E+00

46 1.839E+01 1.043E+00 1.270E-01 96 3.196E+01 3.430E+01 1.472E+00

47 1.870E+01 1.321E+00 1.710E-01 97 3.211E+01 2.477E+01 9.190E-01

48 1.890E+01 1.770E+00 2.130E-01 98 3.226E+01 1.729E+01 9.000E-01

49 1.910E+01 1.905E+00 1.750E-01 99 3.242E+01 1.514E+01 6.570E-01

50 1.931E+01 2.510E+00 2.220E-01 100 3.257E+01 1.173E+01 7.010E-01

(5)

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

101 3.267E+01 9.651E+00 6.180E-01 150 4.589E+01 6.880E+01 2.104E+00

102 3.277E+01 8.702E+00 6.340E-01 151 4.624E+01 2.024E+01 7.460E-01

103 3.293E+01 7.819E+00 4.340E-01 152 4.659E+01 1.138E+01 4.970E-01

104 3.314E+01 7.269E+00 4.170E-01 153 4.685E+01 7.255E+00 5.180E-01

105 3.340E+01 6.011E+00 3.210E-01 154 4.711E+01 6.270E+00 3.380E-01

106 3.378E+01 5.464E+00 2.650E-01 155 4.747E+01 4.656E+00 2.910E-01

107 3.421E+01 5.542E+00 2.680E-01 156 4.792E+01 3.479E+00 2.120E-01

108 3.454E+01 5.762E+00 3.620E-01 157 4.848E+01 3.180E+00 2.130E-01

109 3.477E+01 5.466E+00 3.580E-01 158 4.913E+01 2.901E+00 1.790E-01

110 3.499E+01 6.109E+00 3.800E-01 159 5.030E+01 2.320E+00 1.190E-01

111 3.522E+01 7.529E+00 4.160E-01 160 5.222E+01 2.197E+00 1.040E-01

112 3.545E+01 7.976E+00 4.220E-01 161 5.458E+01 2.299E+00 1.060E-01

113 3.575E+01 1.037E+01 4.280E-01 162 5.722E+01 1.852E+00 9.200E-02

114 3.604E+01 1.129E+01 4.980E-01 163 5.992E+01 1.746E+00 9.300E-02

115 3.628E+01 1.419E+01 5.630E-01 164 6.228E+01 1.696E+00 1.030E-01

116 3.652E+01 1.804E+01 6.610E-01 165 6.392E+01 1.939E+00 1.410E-01

117 3.670E+01 2.319E+01 9.820E-01 166 6.477E+01 3.076E+00 2.380E-01

118 3.689E+01 3.141E+01 1.011E+00 167 6.534E+01 8.958E+00 4.060E-01

119 3.714E+01 5.211E+01 1.572E+00 168 6.593E+01 3.654E+01 1.167E+00

120 3.739E+01 1.050E+02 3.051E+00 169 6.637E+01 2.598E+01 1.130E+00

121 3.764E+01 1.835E+02 5.267E+00 170 6.667E+01 6.202E+00 5.130E-01

122 3.789E+01 7.062E+02 2.034E+01 171 6.697E+01 2.454E+00 3.400E-01

123 3.815E+01 1.765E+02 5.156E+00 172 6.742E+01 2.056E+00 2.110E-01

124 3.841E+01 6.787E+01 2.074E+00 173 6.804E+01 1.741E+00 1.890E-01

125 3.861E+01 4.560E+01 1.765E+00 174 6.898E+01 1.707E+00 1.390E-01

126 3.881E+01 3.129E+01 1.072E+00 175 7.058E+01 1.657E+00 1.140E-01

127 3.901E+01 2.101E+01 9.670E-01 176 7.275E+01 1.762E+00 1.070E-01

128 3.921E+01 1.638E+01 6.510E-01 177 7.466E+01 2.214E+00 1.480E-01

129 3.948E+01 1.311E+01 5.590E-01 178 7.591E+01 2.807E+00 1.830E-01

130 3.975E+01 9.950E+00 4.600E-01 179 7.682E+01 5.660E+00 2.770E-01

131 3.996E+01 9.366E+00 6.010E-01 180 7.757E+01 1.956E+01 6.370E-01

132 4.017E+01 7.555E+00 4.040E-01 181 7.814E+01 6.940E+01 2.254E+00

133 4.045E+01 5.739E+00 3.430E-01 182 7.871E+01 1.887E+02 5.265E+00

134 4.081E+01 5.210E+00 2.720E-01 183 7.948E+01 2.233E+01 7.610E-01

135 4.124E+01 4.560E+00 2.590E-01 184 8.027E+01 5.830E+00 2.900E-01

136 4.161E+01 4.253E+00 2.870E-01 185 8.086E+01 4.180E+00 3.300E-01

137 4.198E+01 3.990E+00 2.360E-01 186 8.147E+01 3.324E+00 2.300E-01

138 4.235E+01 4.583E+00 3.080E-01 187 8.207E+01 2.629E+00 2.850E-01

139 4.266E+01 4.085E+00 2.920E-01 188 8.269E+01 2.173E+00 1.920E-01

140 4.304E+01 4.551E+00 2.580E-01 189 8.374E+01 1.884E+00 1.500E-01

141 4.343E+01 5.648E+00 3.370E-01 190 8.523E+01 2.395E+00 1.570E-01

142 4.375E+01 6.459E+00 3.530E-01 191 8.676E+01 2.371E+00 1.620E-01

143 4.407E+01 9.398E+00 4.320E-01 192 8.788E+01 2.713E+00 2.050E-01

144 4.431E+01 1.190E+01 6.350E-01 193 8.879E+01 6.622E+00 3.680E-01

145 4.448E+01 1.778E+01 8.130E-01 194 8.972E+01 3.750E+01 1.385E+00

146 4.472E+01 2.831E+01 9.240E-01 195 9.042E+01 9.709E+01 3.118E+00

147 4.505E+01 7.322E+01 2.136E+00 196 9.114E+01 5.595E+01 1.669E+00

148 4.539E+01 2.331E+02 6.638E+00 197 9.210E+01 5.285E+00 2.800E-01

149 4.564E+01 2.684E+02 8.710E+00 198 9.358E+01 2.428E+00 1.430E-01

(6)

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

2. | 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 × æí 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 } . ÷ rë ß m r « Ñ_ Ä »´ ò

¿

ºa 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 ¦ 9 K

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

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

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 [23]\ ¦ s 6 x # > í ß % i .

MCNP > í ß õ \ ¦ Fig. 3 \ ? /% 3 . s ï× ¼\ 6

xô Ç é ß & h É r JENDL-3.2_ ¨ î u \ ¦ s 6 x # > í ß ` ¦ Ù þ

¡ .

: r ½ ¨\ " f % 3 # Q õ H : x > ¸ \ -t % ò

%

¹⁰

B r

« Ñü <

¹²⁷

I r « Ñ_ Ø ¦ ´ òÖ ¦ \ @ /ô Ç ¸ y y 0.5ü <

10

B(n,α)é ß & h \ @ /ô Ç ¸ 2.4 %\ ¦ í < Ê 8 ú x ¸

2.5\ " f 15.8 %\ ¦ ? /% 3 .

IV. ¤X N Ë+ s ÇÊ Ý õ m Í + s Ç Â ] Ø

« > è_ + þ A5 Å q l \ ¦ s 6 xô Ç TOFZ O ` ¦ s 6 x # 0.003 eV \ " f 100 eV% ò % i \ s Ø Ô H

¹²⁷

I_ × æ$ í í S \ é ß & h

`

¦ 8 £ ¤& ñ % i . Õ ª õ \ ¦ Fig. 4 ü < Table 4\ ? /% 3

.

¹²⁷

I_ × æ$ í í S \ é ß & h \ @ /ô Ç s _ õ [ þ t É r s

% ò % i \ " f \ P × æ$ í í S \ é ß & h ` ¦ ] jü @ ¦ H Lead

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

127

I(n,γ)

¹²⁸

I reaction with the current measurement

slowing-down spectrometer ~ ½ ÓZ O Ü ¼ Ð 8 £ ¤& ñ ô Ç Popov [9]_

# Qt H ' a > Ð : r ½ ¨\ " f % 3 # Q õ ü < f ] X & h q

§\ ¦ ½ + É Ã º \ O % 3 . : £ ¤ y : r ½ ¨\ " f H × æ$ í \ -t

10 eV Â Ò H \ É r / B N" î x ß ¼ 8 £ ¤& ñ ÷ &% 3 . s õ

H Mughabghab [18] \ _ K " f · ú 9 10.4 eV / B N" î õ { 9 u

< Ê` ¦ Ð% i . ¨ î u JENDL-3.3 [10],ENDF/B-VI [19], JEF-2.2 [20] \ @ /K " f H 1/v% ò % i \ " f H ¸¿ º B Ä º

¸

ú { 9 u ¦ e Ü ¼ , / B N" î \ -t Â Òì r \ " f H JEF-2.2 ü <

¸

ú { 9 u % i ¦, JENDL-3.3 [10], ENDF/B-VI H / B N" î _

é ß Â Ò : r õ Ð É r ° ú כ` ¦ f ` ¦ ^ ¦ Ã º e .

¹

27I _ > 5 Å q ÷ & H / B N" î x ß ¼[ þ t õ 5 Å q Â Òì r \ " f_ × æ$ í í S \

\

" f_ 8 £ ¤& ñ s כ ¹½ ¨ ) a . s Â Òì r_ 8 £ ¤& ñ ` ¦ 0 AK " f H : r 8

£

.

P c

p 8 ý ò k >

s

7 Hë H É r 2003 < Æ¸ ¸ 1 l x @ / < Æ § < ÆÕ ü t ½ ¨q (/ B N ¸õ ]

j)t " é ¶ \ _ # ½ ¨÷ &% 3 6 £ §.

Y c

p w Ã U Ø ô

[1] S. Y. Lee, J. Hori and M. Igashira, J. of Nucl. Sci.

and Tech. 36, 719 (1999).

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

[3] T. Wakabayashi, Proc. of Int. Conf. Evaluation of

Emerging Nucl. Fuel Cycle System: Global ’95,

(Versailles, Commissariat a L’Energie Atomique,

1995), p. 800.

(7)

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

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

[6] D. D. Clayton, Principles of stellar evolution and nucleosynthesis, (Univ. of Chicago Press, Chicago, 1968).

[7] M. Busso and R. Gallino, Nucl. Phys. A 621, 431c (1997).

[8] C. Arlandini, M. Heil, R. Reifarth, F. Kappeler and P. V. Sedyshev, Nucl. Phys. A 688, 487c (2001).

[9] Ju. P. Popov and F. L. Shapiro, Soviet Phys. JETP 15, 683 (1962).

[10] Descriptive Data of JENDL-3.2, JAERI-Data/

Code 98-006 (part II), edited by K. Shibata and T. Narita (Japan Atomic Energy Research Institute, 1998).

[11] L. Seren, J. of Phys. Rev. 72, 888 (1947).

[12] H. Pomerance, J. of Phys. Rev. 83, 641 (1951).

[13] B. Grimeland, J. of Phys. Rev. 86, 937 (1952).

[14] R. B. Tattersall, H. Rose, S. K. Patternden, D.

Jowitt and H. Pomerance, J. of Nucl. Energy 12, 32 (1960).

[15] E. T. Jozefowicz, J. of Nukleonika 8, 437 (1963).

[16] J. C. Robertson, J. of Nucl. Phys. 71, 417 (1965).

[17] T. B. Ryves, J. of Nucl. Eerngy 24, 35 (1970).

[18] S. F. Mughabghab, M. Divadeenam and N. E.

Holden, Neutron Resonance Parameters and Ther- mal Cross Sections, (Academic Press, New York, 1981), Vol. 1.

[19] ”ENDF-201, ENDF/B-VI Summary Documen- tation,” BNL-NCS-17541, MOD1 New evalua- tion (ENDF/B-VI) 4th 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 Supple- ment 1 ENDF/HE-VI Summary Documentation,”

BNL NCS-17541, MOD3 Rev. 2 (ENDF/B-VI), Suppl. 1, 4

^th

ed. (Brookhaven National Laboratory, 1996).

[20] C. NORDBORG and M. SALVATORES, Proc. Intl Conf. Nuclear Data for Science and Technology, (Tennessee, 1994), Vol. 2.

[21] Samyol Lee, SAEMULLI 49, 241 (2004).

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

[23] F. J. Briesmeister, MCNP-A General Monte Carlo

Code for Neutron and Photon Transport, (Los

Alamos National Laboratory, 1997).

(8)

Measurement of the Energy-Dependent Neutron Capture Cross-Section of ¹²⁷ I

Jungran Yoon and Taeik Ro

Department of Material Physics, Dong-A University, Busan 604-714

Samyol Lee

^∗

Department of Radiological Science, Nambu University, Gwangju 506-824 (Received 8 March 2005)

The neutron capture cross-section of Iodine (

¹²⁷

I) has been measured by using the neutron time- of-flight (TOF) method with the 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 to measure the prompt capture γ-rays from the samples. A plug of

¹⁰

B powder was used to determine the neutron flux impinging on the capture samples for thermal and higher neutron energies. The existing experimental data and the evaluated capture cross-sections in ENDF/B-VI, JENDL-3.3, and JEF-2.2 have been compared with the current results.

PACS numbers: 24

Keywords:

¹²⁷

I, Neutron, Capture, TOF, BGO, Cross section

∗

E-mail: [email protected]

127 I8 ý ; c .U 8 ý Ç X Ø ú n ÞV R Ë  ºT    mì ÅX ì Ä  ¤X N Ë

127 I8 ý ; c .U  8 ý Ç X Ø ú n ÞV R Ë   ºT    mì ÅX ì Ä  ¤X N Ë

*

× <+ ä ¸ 6 Ò · { ¡?    ¸

1 l

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T    ~ x ∗

z

 Â Ò@ / < Æ § ~ ½ Ó    < Æõ , F g Å Ò 506-824 (2005¸  3 Z 4 8{ 9  ~ Ã Î6 £ §)

I(n,γ)

Ge

O

(BGO) $ 3 F g ^  Ð ½ ¨$ í  ) a   \  -t f  ¨ Ã º  Ø  ¦ © u  Ð

I(n,γ)

ì ø Í6 £ x Ü ¼ ÐÂ Ò'   ¸  H y   

 

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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 " f ×  æ$ í    5 Å q ×  æç ß \  BF

  Ø  ¦ l \  ¦ [ O u Ù þ ¡ . % 3 # Q 

I(n,γ)

ì ø Í6 £ x é

ß

  & h _  8 £ ¤& ñ   õ   H s   _  z ´+ « >\  _ ô  Ç 8 £ ¤& ñ   õ [ þ t x 9 ENDF/B-VI, JENDL-3.3 x 9 JEF-2.2_ 

¨ î

  ) a ° ú כ[ þ t õ  q  § x 9    Ð % i  .

PACS numbers: 24

Keywords:

I, ×  æ$ í  ,  í S \ , TOF, BGO, é ß   & h

I. " e Â ] Ø

I(n,γ)

ì ø Í6 £ x \  @ /ô  Ç é ß   & h  É r Ù þ ½ ¨ ¸ > í ß \   9 כ ¹ ô 

Ç ×  æ כ ¹ô  Ç X <s ' \  ¦ ] j/ B N ô  Ç . [1] ¢ ¸ô  Ç  & 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  l  í X <s '  Ð  6 x ÷ &# Q  . [2–5] : £ ¤ y  " é ¶   Ð

\

" f Ò q t$ í ÷ &  H ~ ½ Ó $ í ` l Ó ü t % o \  e  # Q" f  © Ã º" î Ù þ  ì

 r\ P ¼ # (LLFP: Long-Lived Fission Products)[ þ t 

Sr,

Tc,

I,

Cs,

Cs[ þ t \  @ /ô  Ç   ½ ¨\  e  # Q" f

I_ 



èY >  % o  õ & ñ ×  æ

IÙ þ ì  r\ P ¼ # \   í < Ê÷ &# Q e    H

I_ 

×

 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 <   s

 . ¢ ¸ô  Ç " é ¶   Ð_   ¦   è Ù þ " é ¶ « Ñ ×  æ \  ë ß [ þ t # Qt   H  ©  Ã

º" î " é ¶  Ù þ ì  r\ P  Ò q t$ í Ó ü t(LLFP) Ù þ 7 á x_   èY > `  ¦ 3 l q& h Ü ¼



Ð ô  Ç Ù þ   ¨ 8  l Õ ü t_    ½ ¨ > hµ 1 Ï\  e  # Q" f Ù þ ì  r\ P  Ã ºÖ  ¦ s

  H B) " é ¶  è Ù þ 7 á x_  & ñ S X ô  Ç ×  æ$ í    í S \ é ß   & h  É r ×  æ כ

¹  . ÷  rë ß   m   Ä ºÅ ÒÓ ü t o \  e  # Q" f  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 ¹ ô 

Ç כ ¹ è Ð+   6 x ) a . [6–8]

E-mail: [email protected]

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&

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$ í

   í S \    õ [ þ t É r \ P ×  æ$ í   % ò % i \ " f keV \  -t  % ò

%

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&

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á

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 · p  כ õ  ° ú s 

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 É

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127 I8 ý ; c .U 8 ý Ç X Ø ú n ÞV R Ë ºT mì ÅX ì Ä ¤X N Ë

127 I8 ý ; c .U 8 ý Ç X Ø ú n ÞV R Ë ºT mì ÅX ì Ä ¤X N Ë

× <+ ä ¸ 6 Ò · { ¡? ¸

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T ~ x ^∗

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(BGO) $ 3 F g ^ Ð ½ ¨$ í ) a \ -t f ¨ Ã º Ø ¦ © u Ð

ì ø Í6 £ x Ü ¼ ÐÂ Ò' ¸ H y

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B r « Ñ_

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Ø ¦ l \ ¦ [ O u Ù þ ¡ . % 3 # Q

& h _ 8 £ ¤& ñ õ H s _ z ´+ « >\ _ ô Ç 8 £ ¤& ñ õ [ þ t x 9 ENDF/B-VI, JENDL-3.3 x 9 JEF-2.2_

) a ° ú כ[ þ t õ q § x 9 Ð % i .

I, × æ$ í , í S \ , TOF, BGO, é ß & h

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Ç × æ כ ¹ô Ç X <s ' \ ¦ ] j/ B N ô Ç . [1] ¢ ¸ô Ç & 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 l í X <s ' Ð 6 x ÷ &# Q . [2–5] : £ ¤ y " é ¶ Ð

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r\ P ¼ # (LLFP: Long-Lived Fission Products)[ þ t

Cs[ þ t \ @ /ô Ç ½ ¨\ e # Q" f

I_

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I_

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H B) " é ¶ è Ù þ 7 á x_ & ñ S X ô Ç × æ$ í í S \ é ß & h É r × æ כ

¹ . ÷ rë ß m Ä ºÅ ÒÓ ü t o \ e # Q" f 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 ¹ ô

Ç כ ¹ è Ð+ 6 x ) a . [6–8]

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í S \ õ [ þ t É r \ 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 wô Ç Ù þ 7 á x ¸ ´ ú §Ü ¼ 9, 8½ ¨ , 8 £ ¤& ñ _ & ñ x 9 ¸ ¸ ë ß 7

¤ Û ¼X O t 3 l wô Ç כ s & ³z ´s . Fig. 1õ Table 1\ " f

· p כ õ ° ú s

I \ @ /ô Ç l > r_ × æ$ í í S \ é ß & h

É

r \ P × æ$ í í S \ é ß & h ` ¦ ] jü @ ¦ H 10 eV s © \ " f Â

Ò' 8 £ ¤& ñ ô Ç Popov [9]_ õ Â Òs . s Popov_

õ H Lead Slowing-down Spectrometer ~ ½ ÓZ O Ü ¼ Ð 8 £ ¤& ñ ô

Ç כ Ü ¼ Ð, / B N" î \ -t % ò % i \ " f_ \ -t ì r K 0 p x s ©

© y b # Q4 R ¨ î ) a ° ú כ[ þ t õ / B N" î \ -t Â Òì r \ " f © { © ô Ç

s \ ¦ Ðs ¦ e Ü ¼Ù ¼ Ð s % ò % i \ @ /ô Ç & ñ S X ô Ç 8 £ ¤& ñ s כ

¹½ ¨ ) a . ¢ ¸ô Ç \ P × æ$ í í S \ é ß & h É r 6.2 barn [10] Ü ¼

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¨ 9, s õ [ þ t ¸ ¸ # 3 0 A ? /\ " f { 9 ' a$ í e H ° ú כ[ þ t

¦ ] jr t 3 l w ¦ e . ÷ rë ß m , + þ A5 Å q l

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í S \ õ H \ O H z ´& ñ s . " f

I \ @ /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 ¹

¨÷ & ¦ e H © S ! s .

0 Aü < ° ú É r s Ä »\ " f : r ½ ¨ H { 9 : r § Ð@ / < Æ " é ¶ Ð z

´+ « > è_ y © § 4 ô Ç ` O Û ¼ + þ AI _ 46-MeV + þ A

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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 % ò % i 0.003 ∼ 100 eV \ s Ø Ô H × æ$ í \ @ /ô Ç

I_ × æ$ í í S \ é ß

h ` ¦ 8 £ ¤& ñ % i . r « Ñ\ { 9 ÷ & H × æ$ í 5 Å q` ¦ 8 £ ¤& ñ

l 0 AK " f

B_

B(n,αγ) ì ø Í6 £ x` ¦ s 6 x % i . : £ ¤ y , 10 eV s \ " f_ × æ$ í í S \ é ß & h É r \ P × æ$ í í S \

ß & h ` ¦ ] jü @ ¦ H : r ½ ¨\ " f % 6 £ § Ü ¼ Ð 8 £ ¤& ñ ` ¦ r

¸ % i .

: r ½ ¨\ " f % 3 # Q õ H l > r_ Popov [9]_ 8 £ ¤& ñ

õ x 9 ¨ î ° ú כ[ þ t õ q § . ÷ rë ß m , % 3 # Q õ

H 0 A\ " f / å Lô Ç # Q ì r \ " f Ä »6 x > 6 x ÷ &# Q| 9

כ