46-MeV ¹ Å Ò Å] k ù Ò ×M 8 ý ì Å Ò × ú n ÞV R Ë Ò ×ù p § T Ó Þ X ¢ Tm-1698 ý ; c .U 8 ýÇ X Ø ú

(1)

46-MeV ¹ Å Ò Å] k ù Ò ×M 8 ý ì Å Ò × ú n ÞV R Ë Ò ×ù p § T Ó Þ X ¢ Tm-1698 ý ; c .U 8 ýÇ X Ø ú

n ÞV R Ë ºT mì ÅX ì Ä õ m Í «ã _ Ë Ä Z ØV Ä; c 6 X ¢ ì Å

T

~ x

1 l

x " f@ / < Æ § ~ ½ Ó < Æõ , Â Òí ß 617-716

(2010¸ 2 Z 4 9{ 9 ~ Ã Î6 £ §, þ j7 á x Ã º& ñ : r 2010¸ 3 Z 4 22{ 9 ~ Ã Î6 £ §)

169

Tm(n,γ)

¹⁷⁰

Tm ì ø Í6 £ x \ @ /ô Ç × æ$ í f ¨ Ã ºé 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 170 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

¹⁶⁹

Tm(n,γ)

¹⁷⁰

Tm ì ø Í6 £ x Ü ¼ ÐÂ Ò'

¸ H 7 £ ¤ µ 1 Ïy ` ¦ 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 A u

\ [ 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 × æ ç ß \ BF

3

Ø ¦ l \ ¦ [ O u Ù þ ¡ . % 3 # Q

¹⁶⁹

Tm(n,γ)

¹⁷⁰

Tm ì ø Í6 £ x é ß & h _ 8 £ ¤& ñ õ H s _ z ´+ « >\ _ ô Ç õ [ þ t s & ñ x 9 ¸ ± ú É r J. B.

Wilhelmy _ õ ÷ r s 9 & ñ S X ô Ç z ´+ « > õ u Á ºô Ç ' a > Ð JEFF-3.1_ ¨ î õ ü < q § % i .

y

y _ 8 £ ¤& ñ ) a / B N" î \ -t [ þ t É r ° ú כ[ þ t É r JEFF-3.1 x 9 Mughabghab_ ¨ î ° ú כõ q § % i .

Ù þ

d # Q:

¹⁶⁹

Tm, × æ$ í , í S \ ì ø Í6 £ x, q ' r ç ß Z O , BGO Ø ¦ l , é ß & h

A Study on the Energy Dependent Neutron Capture Cross-Section and Their Capture Resonances for ¹⁶⁹ Tm by Continuum Neutron Flux

from the 46-MeV Linac

Samyol Lee ^∗

Department of Radiological Science, Dongseo University, Busan 617-716 (Received 9 February 2010, in final form 22 March 2010)

The neutron capture cross-section of Thulium (

¹⁶⁹

Tm) has been measured in the energy region from 0.003 eV to 170 eV by the neutron time-of-flight (TOF) method with a 46-MeV electron linear accelerator (linac) of the Research Reactor Institute, Kyoto University (KURRI). An assembly of Bi

4

Ge

3

O

12

(BGO) scintillators, which was 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 from 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,αγ) standard cross section were used. The previous experimental data(J. B. WIlhelmy and G. H. E. Sims) and evaluated data in Mughabghab and JEF-3.1 have been compared with the current measurement.

PACS numbers: 24.30.-v

Keywords:

¹⁶⁹

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

∗

E-mail: [email protected] -338-

(2)

I. " e Â ] Ø

Ù þ

½ ¨ ¸\ @ /ô Ç ½ ¨ H B Ä º ´ ú § É r z ´+ « >& h õ [ þ t` ¦ Ð

@

/ Ð ½ ¨÷ & H ì r s . Õ ª × æ \ " f ¸ × æ$ í í S \ é ß

&

h

É r Ù þ ½ ¨ ¸\ ¦ s K H X < B Ä º Ä »6 x ô Ç & ñ Ð× æ _ s

. : r ½ ¨\ " f À Ò ¦ e H

¹⁶⁹

Tm(n,γ)

¹⁷⁰

Tm ì ø Í6 £ x

\

@ /ô Ç é ß & h É r keV% ò % i s © _ \ -t \ @ / # Y > Y >

õ [ þ t s Ð ¦ ÷ &# Q e ¦ 3.91 eV Å Ò/ B N" î Â Òì r \ & ñ x 9 ¸

± ú É r J. B. Wilhelmy _ õ x 9 " é ¶ Ð\ ¦ s 6 x ô Ç G.

H. E. Sims x 9 D. J. Juhnke_ 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 [1,2]. " f : r ½ ¨_ õ H Ù þ ½ ¨ ¸ > í

ß \ 9 כ ¹ô Ç × æ כ ¹ô Ç X <s ' \ ¦ ] j/ B N > ) a [3]. ¢ ¸ô Ç × æ

$ í

\ @ /ô Ç [ O > Ó ü t _ > í ß \ e # Q" f ¸ × æ כ ¹ô Ç X <s '

)

a . : £ ¤ y & ³F Ö ¸ µ 1 Ïy ½ ¨ ' ÷ & ¦ e H ¦5 Å q 7 £ xd

Ð(FBR: Fast Breeder Reactor)ü < 5 Å q l ½ ¨1 l x Ð(ADSR:

Accelerator Driven System 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 [4–7]. : £ ¤ y " é ¶ Ð\ " f Ò q t$ í ÷ & H ~ ½ Ó $ í ` l Ó

ü

t % o \ e # Q" f

¹⁶⁹

Tm _ × 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 . : £ ¤ y

¹⁶⁹

Tm(n,γ)

¹⁷⁰

Tm ì ø Í 6

£

x _ \ P × æ$ í í S \ é ß & h É r 104.9 barn Ü ¼ Ð q §& h H¼ #

\

5 Å q ô Ç . ÷ r ë 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 [8–10].

¹⁶⁹

Tm(n,γ)

¹⁷⁰

Tm ì ø Í6 £ x \ _

K " f ë ß [ þ t # Qt H

¹⁷⁰

Tm É r 1991¸ \ Carl E. Walter\ _

K " f ] jî ß ) a 1 l x 0 A" é ¶ è 1 l x§ 4 r Û ¼% 7 ½ ¨\ " f y F g ~ Ã Î ¦ e

H " é ¶ è× æ _ s [11].

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 × 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 w ô Ç \ - t

½ ¨ç ß ¸ e Ü ¼ 9, 8½ ¨ , 8 £ ¤& ñ _ & ñ x 9 ¸ ¸ ë ß 7 á ¤ Û ¼X O t 3

l

w ô Ç כ s & ³z ´s .

Figure 1 õ Table 1\ " f · p כ õ ° ú s

¹⁶⁹

Tm \ @ / ô

Ç l > r _ × æ$ í í S \ é ß & h É r \ P × æ$ í í S \ é ß & h ` ¦ ]

jü @ ¦ H 1 eV s © \ " fÂ Ò' 8 £ ¤& ñ ô Ç Wilhelmy [1]_

õ Â Òs ¦ \ P × æ$ í Â Òì r _ G. H. E. Sims x 9 D.

J. Juhnke [2] _ õ e . Wilhelmy_ õ H p ² D G _

ÐÛ ¼· ú ¸Û ¼_ + þ A5 Å q l \ ¦ s 6 x ô Ç õ Ð" f 14p ' _

× æ$ í q ' â Ð\ ¦ s 6 x % i . Õ ª Q Õ ª õ [ þ t É r /

B N" î % 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 ¼ Ù

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 104.9 barn [12] Ü ¼ Ð+ © { © y p u \

Fig. 1. The evaluated data of JEF-3.1 and the previous measurement data for the

¹⁶⁹

Tm(n,γ)

¹⁷⁰

Tm Reaction.

¸ Ô ¦ ½ ¨ ¦ Õ ª X <s ' _ ª õ | 9 É r p f ¨ . G. H. E.

Sims x 9 D. J. Juhnke_ õ % i r " é ¶ Ð\ " f Ò q t$ í ) a × æ

$ í

\ ¦ s 6 x # × æ$ í í S \ é ß & h ` ¦ 8 £ ¤& ñ ô Ç õ Ð" f q

§& h \ P × æ$ í % ò % i \ " f_ õ H ø @½ + É ë ß / B N

"

î % ò % i \ " f_ õ \ ¦ % 3 t 3 l w % i . ¨ î õ Ð H Å Ò

Ð Ù þ ì r\ P õ Ö 6 x ½ + Ë\ ' aº ) a X <s ' \ ¦ ¨ î H JEFF- 3.1(Joint Evaluated Fission and Fusion File) [12] _ 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 . y y _ / B N" î \ @ /ô Ç ° ú כ É r Mughabghab [13] ] jr ô Ç ¨ î ° ú כs e ` ¦ ÷ r s .

"

f

¹⁶⁹

Tm \ @ /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 .

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 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 ∼ 170 eV \ s Ø Ô H × æ$ í \ @ /ô Ç

¹⁶⁹

Tm _ × 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

, 1 eV s \ " f_ × æ$ í í S \ é ß & h É r \ P × æ$ í í S \ 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 _ J. B Wilhelmy et al. [1] _ 8 £ ¤& ñ õ x 9 ¨ î ° ú כ[ þ t õ q § % i . ÷ r ë ß m

, % 3 # Q õ H 0 A\ " f / å L ô 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 .

(3)

Table 1. Experiments in the Previous Thermal Measurements for the

¹⁶⁹

Tm(n,γ)

¹⁷⁰

Tm Reaction.

hhh hhh

hhh hhh h Results

Quantity

Year Method Neutron Capture

Cross Section J. B Wilhelmy et al. [1] 2002 TOF method (14 m Flight Path) Resonance Region G. H. E. Sims x 9 D. J. Juhnke [2] 1970 Reactor Activation Thermal region

JEFF-3.1 [12] 1994 Evaluated value 104.9 barn (Thermal)

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

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 University 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 \ ? /% 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 A u

\ [ 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 ´+ « >~ 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 Í6 £ x \ @ /ô Ç Ð ¦ô Ç 7 Hë H \

Ð ¦÷ &% 3 [14]. + þ A5 Å q l _ ¸| õ TD(Time Digitizer) _ ¸| É r Table 2 \ ? /% 3 .

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

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

Sample

¹⁶⁹

Tm

¹⁰

B

^∗

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

Weight of sample(g) 3.2 2.92 Thickness of sample(cm) 1.064 0.8

(Atoms/kb) 3.5 52.42

Size of sample (cm

³

) 1.8 × 1.8 1.8 × 1.8

∗ 10

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

© \ [ þ t # Qe .

∗ 10

B:96.98 %,

¹¹

B:3.02 %

2. ¤X N ËS z »

×

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

¹⁶⁹

Tm _ r « Ñ H ¿ ºa 1.064 mm_ F K5 Å q ó

ø ÍÜ ¼ Ð s À Ò# 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 × 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 Í Ü

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 .

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

(4)

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)` ¦

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 & ³ ½ + 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 ( á Ô í ß ê ø Ís { 9 # Q > ÷ & ¦ s

כ

É r BGO Ø ¦ l \ " f 8 £ ¤& ñ > ) a .

: 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 £ ¤

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

¹⁶⁹

Tm r « Ñ\ ¦ _ p ô Ç . × æ$ í í S \

Ã ºY

^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 [15].

Y

S

(E) = (1 − exp(−N σ

t

(E)t))σ

C

(E)f

C

/σ

t

(E) , (5)

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

#

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

&

> r × æ$ í í S \ é ß & h σ

_C

(E)` ¦ % 3 ` ¦ Ã º e . % 3 # Q õ

H JEFF-3.1 [12] _ \ P × æ$ í í S \ é ß & h 104.9 barn\

½

© o % i .

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 × 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 ¦ 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 [16]\ ¦ 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 JEFF-3.1 _ ¨ î u \ ¦ s 6 x # > í ß ` ¦ Ù þ

¡ .

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

¹⁰

B r « Ñ ü

<

¹⁶⁹

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

(5)

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

¹⁶⁹

Tm(n,γ)

¹⁷⁰

Tm reaction.

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

1 3.460E-03 2.453E+02 4.888E+00 47 4.796E-02 7.799E+01 2.078E-01

2 3.660E-03 2.447E+02 4.516E+00 48 5.079E-02 7.629E+01 2.032E-01

3 3.880E-03 2.415E+02 4.157E+00 49 5.378E-02 7.382E+01 1.981E-01

4 4.110E-03 2.322E+02 3.675E+00 50 5.694E-02 7.188E+01 1.948E-01

5 4.350E-03 2.259E+02 3.300E+00 51 6.028E-02 7.005E+01 1.932E-01

6 4.610E-03 2.221E+02 3.094E+00 52 6.382E-02 6.817E+01 1.890E-01

7 4.880E-03 2.186E+02 2.829E+00 53 6.758E-02 6.624E+01 1.845E-01

8 5.160E-03 2.134E+02 2.547E+00 54 7.156E-02 6.437E+01 1.866E-01

9 5.460E-03 2.131E+02 2.370E+00 55 7.576E-02 6.257E+01 1.860E-01

10 5.790E-03 2.026E+02 2.124E+00 56 8.022E-02 6.049E+01 1.862E-01 11 6.130E-03 1.957E+02 1.938E+00 57 8.494E-02 5.881E+01 1.867E-01 12 6.490E-03 1.909E+02 1.788E+00 58 8.993E-02 5.747E+01 1.909E-01 13 6.870E-03 1.888E+02 1.664E+00 59 9.522E-02 5.556E+01 1.956E-01 14 7.280E-03 1.833E+02 1.523E+00 60 1.008E-01 5.389E+01 1.984E-01 15 7.710E-03 1.787E+02 1.410E+00 61 1.067E-01 5.214E+01 2.046E-01 16 8.160E-03 1.752E+02 1.302E+00 62 1.130E-01 5.052E+01 2.095E-01 17 8.640E-03 1.647E+02 1.168E+00 63 1.197E-01 4.919E+01 2.196E-01 18 9.150E-03 1.624E+02 1.117E+00 64 1.267E-01 4.802E+01 2.336E-01 19 9.690E-03 1.602E+02 1.053E+00 65 1.342E-01 4.626E+01 2.356E-01 20 1.025E-02 1.590E+02 9.889E-01 66 1.421E-01 4.509E+01 2.551E-01 21 1.086E-02 1.535E+02 9.074E-01 67 1.504E-01 4.391E+01 2.678E-01 22 1.149E-02 1.510E+02 8.487E-01 68 1.592E-01 4.267E+01 2.777E-01 23 1.217E-02 1.465E+02 7.862E-01 69 1.686E-01 4.147E+01 2.868E-01 24 1.288E-02 1.435E+02 7.330E-01 70 1.785E-01 4.051E+01 3.137E-01 25 1.364E-02 1.399E+02 6.839E-01 71 1.890E-01 3.980E+01 3.209E-01 26 1.445E-02 1.350E+02 6.378E-01 72 2.001E-01 3.868E+01 3.322E-01 27 1.529E-02 1.309E+02 5.894E-01 73 2.119E-01 3.824E+01 3.438E-01 28 1.619E-02 1.292E+02 5.608E-01 74 2.244E-01 3.753E+01 3.560E-01 29 1.715E-02 1.263E+02 5.280E-01 75 2.376E-01 3.700E+01 3.611E-01 30 1.815E-02 1.228E+02 4.948E-01 76 2.515E-01 3.628E+01 3.686E-01 31 1.922E-02 1.196E+02 4.617E-01 77 2.663E-01 3.560E+01 3.674E-01 32 2.035E-02 1.168E+02 4.328E-01 78 2.820E-01 3.452E+01 3.587E-01 33 2.156E-02 1.126E+02 4.037E-01 79 2.986E-01 3.363E+01 3.488E-01 34 2.282E-02 1.101E+02 3.829E-01 80 3.161E-01 3.333E+01 3.565E-01 35 2.416E-02 1.077E+02 3.610E-01 81 3.347E-01 3.293E+01 3.505E-01 36 2.558E-02 1.044E+02 3.402E-01 82 3.544E-01 3.181E+01 3.521E-01 37 2.709E-02 1.015E+02 3.222E-01 83 3.753E-01 3.114E+01 3.330E-01 38 2.868E-02 9.888E+01 3.057E-01 84 3.973E-01 3.021E+01 3.320E-01 39 3.036E-02 9.689E+01 2.917E-01 85 4.207E-01 2.987E+01 3.425E-01 40 3.215E-02 9.412E+01 2.767E-01 86 4.454E-01 2.910E+01 3.223E-01 41 3.404E-02 9.187E+01 2.641E-01 87 4.716E-01 2.851E+01 3.273E-01 42 3.604E-02 8.974E+01 2.507E-01 88 4.994E-01 2.781E+01 3.215E-01 43 3.816E-02 8.734E+01 2.411E-01 89 5.287E-01 2.837E+01 3.407E-01 44 4.041E-02 8.390E+01 2.305E-01 90 5.598E-01 2.717E+01 3.141E-01 45 4.279E-02 8.224E+01 2.241E-01 91 5.927E-01 2.681E+01 3.211E-01 46 4.530E-02 8.014E+01 2.150E-01 92 6.276E-01 2.617E+01 3.172E-01

¹⁰

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

(6)

Energy(eV) Cross Section(barn) Error(barn) Energy(eV) Cross Section(barn) Error(barn) 93 6.645E-01 2.702E+01 3.181E-01 140 5.827E+00 1.443E+01 3.672E-01 94 7.036E-01 2.614E+01 3.258E-01 141 5.950E+00 1.280E+01 3.372E-01 95 7.449E-01 2.641E+01 3.267E-01 142 6.226E+00 1.141E+01 3.219E-01 96 7.888E-01 2.584E+01 3.184E-01 143 6.470E+00 9.478E+00 2.093E-01 97 8.351E-01 2.612E+01 3.164E-01 144 6.607E+00 8.106E+00 1.932E-01 98 8.842E-01 2.550E+01 3.073E-01 145 6.794E+00 6.800E+00 1.734E-01 99 9.363E-01 2.580E+01 3.263E-01 146 7.083E+00 5.842E+00 1.592E-01 100 9.913E-01 2.580E+01 3.046E-01 147 7.301E+00 5.138E+00 1.521E-01 101 1.050E+00 2.651E+01 3.226E-01 148 7.528E+00 4.723E+00 2.021E-01 102 1.111E+00 2.622E+01 3.205E-01 149 7.957E+00 4.301E+00 1.912E-01 103 1.177E+00 2.656E+01 3.179E-01 150 8.426E+00 4.150E+00 1.850E-01 104 1.246E+00 2.715E+01 3.438E-01 151 8.790E+00 4.010E+00 1.299E-01 105 1.319E+00 2.754E+01 3.196E-01 152 9.026E+00 1.861E+01 2.819E-01 106 1.397E+00 2.868E+01 3.445E-01 153 9.273E+00 4.838E+00 1.026E-01 107 1.479E+00 2.955E+01 3.515E-01 154 9.590E+00 5.379E+00 1.440E-01 108 1.566E+00 3.070E+01 3.524E-01 155 1.005E+01 1.637E+01 2.030E-01 109 1.658E+00 3.232E+01 3.581E-01 156 1.062E+01 1.235E+02 6.407E-01 110 1.755E+00 3.458E+01 3.685E-01 157 1.178E+01 1.087E+01 2.607E-01 111 1.859E+00 3.653E+01 4.112E-01 158 1.251E+01 8.526E+00 2.299E-01 112 1.968E+00 3.994E+01 4.011E-01 159 1.381E+01 9.254E+01 5.954E-01 113 2.084E+00 4.418E+01 4.470E-01 160 1.515E+01 3.343E+01 3.914E-01 114 2.206E+00 4.940E+01 4.466E-01 161 1.590E+01 3.215E+00 8.829E-02 115 2.336E+00 5.746E+01 5.107E-01 162 1.678E+01 2.845E+00 1.390E-01 116 2.473E+00 6.943E+01 5.887E-01 163 1.777E+01 1.022E+01 2.588E-01 117 2.619E+00 8.708E+01 6.784E-01 164 1.881E+01 2.641E+00 9.397E-02 118 2.773E+00 1.080E+02 8.489E-01 165 1.992E+01 2.665E+00 1.305E-01 119 2.936E+00 1.450E+02 1.029E+00 166 2.211E+01 1.644E+01 2.852E-01 120 3.108E+00 2.184E+02 1.303E+00 167 2.365E+01 4.359E+00 1.528E-01 121 3.291E+00 3.093E+02 1.816E+00 168 2.487E+01 2.899E+00 1.297E-01 122 3.485E+00 3.779E+02 3.051E+00 169 2.630E+01 4.329E+01 3.168E-01 123 3.675E+00 5.752E+02 6.179E+00 170 2.807E+01 2.581E+01 2.322E-01 124 3.778E+00 1.452E+03 1.557E+01 171 2.972E+01 3.910E+01 3.470E-01 125 3.823E+00 4.069E+03 4.343E+01 172 3.131E+01 5.077E+01 5.112E-01 126 3.889E+00 8.701E+03 9.279E+01 173 3.251E+01 2.437E+01 1.837E-01 127 3.957E+00 1.131E+04 1.089E+02 174 3.904E+01 3.049E+01 3.374E-01 128 4.026E+00 5.051E+03 3.554E+01 175 4.610E+01 5.474E+01 4.559E-01 129 4.158E+00 1.071E+03 8.926E+00 176 5.312E+01 1.699E+01 1.775E-01 130 4.361E+00 2.936E+02 2.918E+00 177 6.023E+01 2.841E+01 3.267E-01 131 4.500E+00 1.603E+02 1.678E+00 178 6.559E+01 2.663E+01 2.719E-01 132 4.628E+00 1.024E+02 1.041E+00 179 8.005E+01 1.730E+01 2.383E-01 133 4.775E+00 6.803E+01 8.823E-01 180 8.954E+01 2.923E+00 1.161E-01 134 5.006E+00 5.309E+01 8.164E-01 181 9.781E+01 2.393E+01 2.654E-01 135 5.133E+00 4.630E+01 7.431E-01 182 1.137E+02 2.059E+01 2.510E-01 136 5.241E+00 3.252E+01 4.616E-01 183 1.292E+02 1.597E+01 2.252E-01 137 5.358E+00 2.648E+01 5.288E-01 184 1.411E+02 1.017E+01 1.379E-01 138 5.469E+00 2.375E+01 4.731E-01 185 1.580E+02 6.343E+00 1.121E-01 139 5.625E+00 1.819E+01 2.704E-01 186 1.767E+02 1.874E+00 1.039E-01

2.5\ " f 6.1 %\ ¦ ? /% 3 . IV. ¤X N Ë+ s ÇÊ Ý õ m Í + s Ç Â ] Ø

(7)

Table 5. Comparison of the resonance energies between the current measurement and Mughabghab evaluated data.

Neutron Resonance Energy of Neutron Resonance Energy of JEFF-3.1

Present Measurement (eV) Mughabghab (eV)

^∗

(eV)

^∗∗

1 3.95 3.91 3.91

2 - 5.45 -

3 9.03 8.01 -

4 10.62 10.33 -

5 13.81 14.40 14.40

6 - 16.25 -

7 17.77 17.44 17.44

8 - 20.3 -

9 22.11 23.93 -

∗

: Evaluated data of resonance parameters,

^∗∗

: Evaluated data of neutron capture cross section.

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

169

Tm(n,γ)

¹⁷⁰

Tm reaction with the present measure- ment. Where a is thermal neutron energy region, b is 3.9 eV main resonance, c, d, and e are new resonances, f is continuum region.

« > è_ + þ A5 Å q l \ ¦ s 6 x ô Ç TOFZ O ` ¦ s 6 x # 0.003 eV \ " f 170 eV % ò % i \ s Ø Ô H

¹⁶⁹

Tm _ × æ$ í í S \ é ß

&

h

` ¦ 8 £ ¤& ñ % i . Õ ª õ \ ¦ Fig. 4, Table 4 x 9 Table 5\

? /% 3 .

169

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

% ò % i \ " f J. B. Wilhelmy [1]_ õ ü < G. H. E. Sims x 9

D. J. Juhnke [2]_ õ ° ú É r \ P × æ$ í % ò % i _ õ ë ß

> r F ½ + É ÷ r s . J. B. Wilhelmy_ õ H × æ$ í ì r K 0 p x s

x% 3 . s õ H & ñ S X ô Ç é ß & h \ @ /ô Ç õ \ ¦ % 3 t 3 l w

% i . " f : r ½ ¨\ " f % 3 # Q õ ü < f ] X & h q

§\ ¦ ½ + É Ã º \ O % 3 . ^ & h / B N" î _ + þ AI [ þ t É r : r ½ ¨ _

õ ü < { 9 u H â ¾ Ó` ¦ Ð% i . \ P × æ$ í % ò % i _ G.

H. E. Sims x 9 D. J. Juhnke_ õ H ¨ î õ ° ú כõ ¸ { 9

u 9 : r ½ ¨ õ ü < ¸ ¸ # 3 0 A ? /\ " f B Ä º { 9 u

H â ¾ Ó` ¦ Ð% i .

3.9 eV \ " f_ H / B N" î É r : r ½ ¨ õ H Fig. 4 ü < Ta- ble 5 \ " f Ð H ü < ° ú s JEFF-3.1_ õ x 9 Mugah- bghab _ õ ü < ¸ B Ä º { 9 u H â ¾ Ó` ¦ Ð% i . Õ ª Q

/ B N" î _ > r F Ä »Á º\ @ / # JEFF-3.1_ õ [ þ t õ Mu- gahbghab _ õ H © s ô Ç õ \ ¦ Ð% i . : £ ¤ y Mugah- bghab µ 1 Ï³ ðô Ç 5.45, 16.25, 20.3 eV / B N" î É r : r z ´+ « >\

"

f H ' a8 £ ¤ ÷ &# Qt t · ú § ¤ . ÷ r ë ß m Mugahbghab\ _

K " f H µ 1 Ï³ ð÷ &% 3 t ë ß JEFF-3.1\ " f H t · ú § ¤

~

9.03(c/ B N" î ), 10.62(d/ B N" î ) x 9 22.11 eV(e / B N" î ) / B N" î [

þ

t s S X ÷ &% 3 . " f : r ½ ¨_ õ H s / B N" î [ þ t _

z ´] j > r F Ä »Á º\ ¦ & ñ H B Ä º × æ כ ¹ô Ç õ \ ¦ % 3 % 3

¦ ^ ¦ Ã º e Ü ¼ 9 · ú ¡Ü ¼ Ð_ é ß & h ¨ î \ e # Q" f B Ä º

×

æ כ ¹ô Ç õ ¦ ½ + É Ã º e .

¹⁶⁹

Tm _ > 5 Å q ÷ & H / B N" î x ß

¼[ þ t õ 5 Å q Â Òì r(f % ò % i )\ " f_ × æ$ í í S \ é ß & h ` ¦ · ú l

¹½ ¨ ) a . 8 [ jô Ç / B N" î \ @ /ô Ç ½ ¨ כ ¹½ ¨÷ & ¦ e .

s

¸ ú

6 £ § q \ ¦ > h ½ + É 9 כ ¹$ í s e .

P

c p 8 ý ò k >

s

7 Hë H É r 2007¸ & ñ Â Ò( §¹ ¢ ¤ & h " é ¶ Â Ò)_ F " é ¶ Ü ¼ Ð ô

Ç² D G < ÆÕ ü t < É ª F é ß _ t " é ¶` ¦ ~ Ã Î Ã º' ) a ½ ¨e (KRF-

2007-521-C00071).

(8)

Y

c p w Ã U Ø ô

[1] B. Wilhelmy, E. P. Chamberlin, M. R. Dragowsky, M. M. Fowler, C. Haight, M. Heil, F. Kaeppeler, G.

G. Miller, P. D. Palmer, N. Pangault, R. Reifarth, R. S. Rundberg, E. H. Seabury, D. Strottman, J.

L. Ullmann and K. Wisshak, Nuclear Science and Technology 2, 614 (2002)

[2] G. H. E. Sims and D. J. Juhnke, Journal of Inorganic and Nuclear Chemistry 32, 2839 (1970)

[3] S. Y. Lee, J. Hori and M. Igashira, Jouranl of Nu- clear Science and Technology 36, 719 (1999) [4] J. Tommasi, ibid., American Nuclear Society, La

Grange Park, Illinois, p. 1252 (1993).

[5] T. Wakabayashi, Proc. of Int. Conf. Evaluation of Emerging Nucl. Fuel Cycle System: Global ’95 (Versailles, Sept., 1995), Commissariat a L’Energie Atomique, p. 800.

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

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

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

[9] M. Busso and R. Gallino, Nuclear. Physics. A 621, 431c (1997).

[10] C. Arlandini, M. Heil, R. Reifarth, F. K¨ appeler and P. V. Sedyshev, Nuclear. Physics. A 688, 487c (2001).

[11] Carl E. Walter, Proc, of Int. Conf. Unmanned Untethered Submersible Technology Durham (New Hampshire, September, 1991).

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

46-MeV  ¹ Å  Ò Å] k ù  Ò ×M 8 ý  ì Å  Ò × ú n ÞV R Ë  Ò ×ù p § T  Ó Þ X ¢ Tm-1698 ý ; c .U 8 ýÇ X Ø ú

46-MeV  ¹ Å  Ò Å] k ù  Ò ×M 8 ý  ì Å  Ò × ú n ÞV R Ë  Ò ×ù p § T  Ó Þ X ¢ Tm-1698 ý ; c .U 8 ýÇ X Ø ú

n ÞV R Ë  ºT    mì ÅX ì Ä õ m Í   «ã _ Ë Ä Z ØV Ä; c 6  X ¢ ì Å 

T

   ~ x

1 l

x " f@ / < Æ § ~ ½ Ó    < Æõ , Â Òí ß  617-716

(2010¸  2 Z 4 9{ 9  ~ Ã Î6 £ §, þ j7 á x Ã º& ñ  : r 2010¸  3 Z 4 22{ 9  ~ Ã Î6 £ §)

Tm(n,γ)

Tm ì ø Í6 £ x \  @ /ô  Ç ×  æ$ í   f  ¨ Ã ºé ß   & h `  ¦ 46-MeV      + þ A5 Å q l \  ¦ s 6 x #  ×  æ$ í



 TOF ~ ½ ÓZ O Ü ¼ Ð, \  -t  % ò % i 0.003 eV\ " f 170 eV\    5 g 8 £ ¤& ñ % i  .  : r   ½ ¨\ " f  H 12 > h_  Bi

Ge

O

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

Tm(n,γ)

Tm ì ø Í6 £ x Ü ¼ ÐÂ Ò'  



¸  H 7 £ ¤ µ 1 Ïy     `  ¦ 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 A u

\  [ O u ÷ &% 3  . 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 ×  æ ç ß \  BF

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





Tm(n,γ)

Tm ì ø Í6 £ x é ß   & h _  8 £ ¤& ñ   õ   H s   _  z ´+ « >\  _ ô  Ç   õ [ þ t s  & ñ x 9  ¸ ± ú  É r J. B.

Wilhelmy _    õ  ÷  r s  9 & ñ S X  ô  Ç z ´+ « >  õ u    Á ºô  Ç  ' a >  Ð JEFF-3.1_  ¨ î   õ ü < q  § % i  .

y



y  _  8 £ ¤& ñ  ) a / B N" î \  -t [ þ t É r ° ú כ[ þ t É r JEFF-3.1 x 9 Mughabghab_  ¨ î ° ú כõ  q  § % i  .

Ù þ

d  # Q:

Tm, ×  æ$ í  ,  í S \  ì ø Í6 £ x, q '  r ç ß Z O , BGO  Ø  ¦ l , é ß   & h

A Study on the Energy Dependent Neutron Capture Cross-Section and Their Capture Resonances for 169 Tm by Continuum Neutron Flux

from the 46-MeV Linac

Samyol Lee ∗

Department of Radiological Science, Dongseo University, Busan 617-716 (Received 9 February 2010, in final form 22 March 2010)

The neutron capture cross-section of Thulium (

Tm) has been measured in the energy region from 0.003 eV to 170 eV by the neutron time-of-flight (TOF) method with a 46-MeV electron linear accelerator (linac) of the Research Reactor Institute, Kyoto University (KURRI). An assembly of Bi

Ge

O

B powder sample and the

B(n,αγ) standard cross section were used. The previous experimental data(J. B. WIlhelmy and G. H. E. Sims) and evaluated data in Mughabghab and JEF-3.1 have been compared with the current measurement.

PACS numbers: 24.30.-v

Keywords:

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

E-mail: [email protected] -338-

I. " e Â ] Ø

Ù þ

½ ¨ ¸\  @ /ô  Ç   ½ ¨  H B Ä º ´ ú § É r z ´+ « >& h   õ [ þ t`  ¦  Ð

@

/ Ð   ½ ¨÷ &  H ì  r  s  . Õ ª ×  æ \ " f ¸ ×  æ$ í   í S \  é ß  

&

h

 É r Ù þ ½ ¨ ¸\  ¦ s K    H X < B Ä º Ä »6 x ô  Ç & ñ  Ð×  æ _    s

 .  : r   ½ ¨\ " f À Ò ¦ e    H

Tm(n,γ)

Tm ì ø Í6 £ x

\

 @ /ô  Ç é ß   & h  É r keV% ò % i s  © _  \  -t \  @ / #  Y > Y >

 

õ [ þ t s   Ð ¦ ÷ &# Q e   ¦ 3.91 eV Å Ò/ B N" î Â Òì  r \  & ñ x 9  ¸

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%

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$ í

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>

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~ x

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(2010¸ 2 Z 4 9{ 9 ~ Ã Î6 £ §, þ j7 á x Ã º& ñ : r 2010¸ 3 Z 4 22{ 9 ~ Ã Î6 £ §)

Tm ì ø Í6 £ x \ @ /ô Ç × æ$ í f ¨ Ã ºé ß & h ` ¦ 46-MeV + þ A5 Å q l \ ¦ s 6 x # × æ$ í

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\ [ O u ÷ &% 3 . 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 " f × æ$ í 5 Å q × æ ç ß \ BF

Ø ¦ l \ ¦ [ O u Ù þ ¡ . % 3 # Q

Tm ì ø Í6 £ x é ß & h _ 8 £ ¤& ñ õ H s _ z ´+ « >\ _ ô Ç õ [ þ t s & ñ x 9 ¸ ± ú É r J. B.

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y _ 8 £ ¤& ñ ) a / B N" î \ -t [ þ t É r ° ú כ[ þ t É r JEFF-3.1 x 9 Mughabghab_ ¨ î ° ú כõ q § % i .

d # Q:

Tm, × æ$ í , í S \ ì ø Í6 £ x, q ' r ç ß Z O , BGO Ø ¦ l , é ß & h

A Study on the Energy Dependent Neutron Capture Cross-Section and Their Capture Resonances for ¹⁶⁹ Tm by Continuum Neutron Flux

Samyol Lee ^∗

½ ¨ ¸\ @ /ô Ç ½ ¨ H B Ä º ´ ú § É r z ´+ « >& h õ [ þ t` ¦ Ð

/ Ð ½ ¨÷ & H ì r s . Õ ª × æ \ " f ¸ × æ$ í í S \ é ß

É r Ù þ ½ ¨ ¸\ ¦ s K H X < B Ä º Ä »6 x ô Ç & ñ Ð× æ _ s

. : r ½ ¨\ " f À Ò ¦ e H

@ /ô Ç é ß & h É r keV% ò % i s © _ \ -t \ @ / # Y > Y >

õ [ þ t s Ð ¦ ÷ &# Q e ¦ 3.91 eV Å Ò/ B N" î Â Òì r \ & ñ x 9 ¸

± ú É r J. B. Wilhelmy _ õ x 9 " é ¶ Ð\ ¦ s 6 x ô Ç G.

H. E. Sims x 9 D. J. Juhnke_ õ \ ¦ í < Êô Ç \ P × æ$ í % ò

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t · ú § H [1,2]. " f : r ½ ¨_ õ H Ù þ ½ ¨ ¸ > í

ß \ 9 כ ¹ô Ç × æ כ ¹ô Ç X <s ' \ ¦ ] j/ B N > ) a [3]. ¢ ¸ô Ç × æ

\ @ /ô Ç [ O > Ó ü t _ > í ß \ e # Q" f ¸ × æ כ ¹ô Ç X <s '

)

a . : £ ¤ y & ³F Ö ¸ µ 1 Ïy ½ ¨ ' ÷ & ¦ e H ¦5 Å q 7 £ xd

Ð(FBR: Fast Breeder Reactor)ü < 5 Å q l ½ ¨1 l x Ð(ADSR:

Accelerator Driven System 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 [4–7]. : £ ¤ y " é ¶ Ð\ " f Ò q t$ í ÷ & H ~ ½ Ó $ í ` l Ó

t % o \ e # Q" f

Tm _ × 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 . : £ ¤ y

x _ \ P × æ$ í í S \ é ß & h É r 104.9 barn Ü ¼ Ð q §& h H¼ #

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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 [8–10].

Tm ì ø Í6 £ x \ _

K " f ë ß [ þ t # Qt H

Tm É r 1991¸ \ Carl E. Walter\ _

K " f ] jî ß ) a 1 l x 0 A" é ¶ è 1 l x§ 4 r Û ¼% 7 ½ ¨\ " f y F g ~ Ã Î ¦ e

H " é ¶ è× æ _ s [11].

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 × 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 w ô Ç \ - t

½ ¨ç ß ¸ e Ü ¼ 9, 8½ ¨ , 8 £ ¤& ñ _ & ñ x 9 ¸ ¸ ë ß 7 á ¤ Û ¼X O t 3

w ô Ç כ s & ³z ´s .

Figure 1 õ Table 1\ " f · p כ õ ° ú s

Tm \ @ / ô

Ç l > r _ × æ$ í í S \ é ß & h É r \ P × æ$ í í S \ é ß & h ` ¦ ]

jü @ ¦ H 1 eV s © \ " fÂ Ò' 8 £ ¤& ñ ô Ç Wilhelmy [1]_

õ Â Òs ¦ \ P × æ$ í Â Òì r _ G. H. E. Sims x 9 D.

J. Juhnke [2] _ õ e . Wilhelmy_ õ H p ² D G _

ÐÛ ¼· ú ¸Û ¼_ + þ A5 Å q l \ ¦ s 6 x ô Ç õ Ð" f 14p ' _

× æ$ í q ' â Ð\ ¦ s 6 x % i . Õ ª Q Õ ª õ [ þ t É r /

B N" î % ò % i \ " f \ -t ì r K 0 p x s © { © y b # Q4 R ¨ î ) a ° ú כ [

t õ / B N" î \ -t Â Òì r \ " f © { © ô Ç s \ ¦ Ðs ¦ e Ü ¼ Ù

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 104.9 barn [12] Ü ¼ Ð+ © { © y p u \

¸ Ô ¦ ½ ¨ ¦ Õ ª X <s ' _ ª õ | 9 É r p f ¨ . G. H. E.

Sims x 9 D. J. Juhnke_ õ % i r " é ¶ Ð\ " f Ò q t$ í ) a × æ

\ ¦ s 6 x # × æ$ í í S \ é ß & h ` ¦ 8 £ ¤& ñ ô Ç õ Ð" f q

§& h \ P × æ$ í % ò % i \ " f_ õ H ø @½ + É ë ß / B N

î % ò % i \ " f_ õ \ ¦ % 3 t 3 l w % i . ¨ î õ Ð H Å Ò

Ð Ù þ ì r\ P õ Ö 6 x ½ + Ë\ ' aº ) a X <s ' \ ¦ ¨ î H JEFF- 3.1(Joint Evaluated Fission and Fusion File) [12] _ 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 . y y _ / B N" î \ @ /ô Ç ° ú כ É r Mughabghab [13] ] jr ô Ç ¨ î ° ú כs e ` ¦ ÷ r s .