Supported by the National Science Foundation and Indiana Universit

Blue, J.

Friesel, D.

Liu, D.

Smith, W.

English

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RADIOXENON PRODUCTION CROSS SECTIONS FROM CESIUM 
D. F r i e s e l  and W. Smith 
Indiana University CycZotron FaciZity , BZoomington, Indiana 4 7405 
J. Blue and D. Liu 
Lewis Research Center-NASA, CZeve Zand, Ohio 441 35 
Due t o  i n t e r e s t  i n  t he  production of c e r t a i n  is much smal ler  than t h a t  from an iod ine  t a r g e t .  I n  
radioxenon i so topes  f o r  t h e i r  use i n  nuclear  medicine, add i t i on ,  t he  r a t i o  of 1 2 5 ~ e / 1 2 3 ~ e  i s  h igher  and there-  
t h e  c ros s  s ec t ions  f o r  cesium have been measured f o r  f o r e  l e s s  favorable  f o r  t h e  cesium t a r g e t .  
protons with energies  from 65 t o  155 MeV. The experi-  
ment was done by preparing gas-t ight ,  sea led  packets  
CROSS- 
of CsN03 of approximately 0.2 gm/cm2 thickness.  The s~cr10N 
mb 
packets  were stacked i n  two groups of f i v e  and seven 
packets  with in tervening  energy degraders and i r r a -  
d i a t ed  with inc ident  energies  of protons a t  95 MeV 
and a t  152 MeV. Su f f i c i en t  time elapsed f o r  barium 
and cesium iso topes  t o  decay i n t o  radioxenon before 
t h e  packets were counted with a Ge(Li) de t ec to r .  The 
q u a l i t y  of t h e  gas-t ight  s e a l  was checked by a measure- 
ment of t he  h a l f - l i f e  of 1 2 7 ~ e .  The r e s u l t s  a r e  pre- 
sented i n  t he  f i gu re  together  with t he  p red i c t i on  of 
the  ALICE+HYBRID s t a t i s t i c a l  code f o r  2 3 ~ e  d i r e c t l y  
produced by (p ,a  7n) and (p,2p 9n) r eac t ions .  The 
agreement is exce l l en t  f o r  proton energies  where t he  
(p,  2p 9n) r eac t ion  is dominant. The predic ted  alpha 
p a r t i c l e  process has too low a threshold  by 10 MeV 
and a c ross  s ec t ion  maximum nea r ly  70 percent  l a r g e r  
than t h e  observed r e s u l t .  
The r e s u l t s  i nd i ca t e  t h a t  f o r  1 2 7 ~ e ,  cesium is  an 
exce l l en t  t a r g e t  i n  t h a t  i t  has  a high y i e l d ,  and 
l i q u i d  me ta l l i c  cesium has  t he  advantages of showing 
no r a d i a t i o n  damage and being very convenient f o r  
removal of t he  beam heat ing  by vapor t r anspor t .  For 
1 2 3 ~ e ,  t he  production c ros s  s e c t i o n  f o r  a cesium t a r g e t  
ALICE 
loo 
PROTON ENERGY rZeV 
. 
Figure I .  Total cross sections for production of 
Xe isotopes i n  proton bombardment of a cesiwn target.  
The curves m e  a gu{de t o  the eye. A s t a t i s t i c a l  
mode Z caZcuZation for 3 ~ e  production i s  {ndicated 
by the  dashed Zine. 


Radioxenon Production Cross Sections from Cesium

https://scholarworks.iu.edu/dspace/bitstream/2022/2906/1/iucf_1979_127.pdf

Radioxenon Production Cross Sections from Cesium

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