This work was supported by National Science Foundation Grant PHY 76-84033 and Indiana Universit

Doron, A.

Friesel, D.L.

Karwowski, H.J.

Singh, P.P.

Ward, T.E.

Yavin, A.

English

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THE (p,xn) REACTION FROM PROTONS ON BISMUTH AT INTERMEDIATE ENERGIES. 
D.L. F r i e s e l ,  H. Karwowski, P.P. Singh, and T.E. Ward 
A.  oro on,* and A. ~ a v i n *  
Exc i t a t i on  func t i ons  f o r  t h e  production of  
Po i so topes  A = 202, 204, 206, 208, 209 and 210 
from 62-185 MeV pro ton  bombardment of bismuth were 
measured. This  work extends prev ious  data1* 3 t o  
h ighe r  ene rg i e s  wi th  a d d i t i o n a l  y i e l d  in format ion  
f o r  t h e  more d e f i c i e n t  i so topes .  This  work is  an 
ex tens ion  of  t h e  s t udy  of  p ion  product ion  a t  t h r e s -  
ho ld  and i n  p a r t i c u l a r  is  being used t o  compare 
e x i s t i n g  pre-equil ibr ium and cascade codes f o r  
d i r e c t  i n t e r a c t i o n  mechanisms i n  t h e  i n t e rmed ia t e  
energy range. I n  p a r t i c u l a r  we a r e  i n t e r e s t e d  i n  
t he  high-energy exponen t i a l  t a i l  of  the  e x c i t a t i o n  
func t ions .  Of f u r t h e r  i n t e r e s t  a r e  c a l c u l a t i o n s  of  
t he  (p, y )  and (p , TO) con t r i bu t i ons .  
I n  F igure  1 i s  shown t h e  e x c i t a t i o n  func t i ons  f o r  
t h e  production of  210, 209, 208 and 206 polonium i so -  
topes  from pro tons  on bismuth. Included wi th  t h e  
experimental  d a t a  a r e  r e s u l t s  o f  an A L I C E - H ~ ~ ~ ~ ~ ~  
c a l c u l a t i o n  i n  t h e  s imp le s t  approximation w i th  no 
s p i n  dependence taken i n t o  account. The e x c i t a t i o n  
func t i ons  i n  the  60-180 MeV range a r e  i n  gene ra l  
agreement, b u t  c l e a r l y  t he  p r e c i s e  s l o p e  and magni- 
tudes  a r e  n o t  determined. Fu r the r  measurements t o  
h ighe r  ene rg i e s  and more r e f i n e d  c a l c u l a t i o n s  a r e  
planned. 
  el-~viv Un ive r s i t y  
1 )  P. J. Daly and P.F.D. Shaw, Nucl. Phys. 56 (1964) 
322. 
2) Y. LeBeyle and M. L e f o r t ,  Nucl. Phys. A99 (1967) 
131. 
3) M. Miyano, M. Sekikawa, T. Kaneko and M. Nomoto, 
Nucl. Phys. A230 (1974) 98. 
4) Code ALICE; M. Blann, Un ive r s i t y  of  Rochester ,  
rep .  no. C003494-9; Ann. Rev. Nuc. S c i .  25 
(1975) 123, Phys. Rev. L e t t .  27 (1971) 337, 
28 (1972) 757. 
-
0 Kelly (Berkeley) 
o Daly and Shaw (Rutherford 
I.U.C.F. 
0 ALICE - Hybrid Calc. 
(p,n) Hybrid 
L x  10
20 40 do do 160 ~lio ib I& 60 rbo I 
PROTON ENERGY (MeV) 
Figure  1. 


The (p,xn) Reaction from Protons on Bismuth at Intermediate Energies

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The (p,xn) Reaction from Protons on Bismuth at Intermediate Energies

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