This work was supported by National Science Foundation Grant PHY 75-00289 and Indiana Universit

Castaneda, C.M.

Macias, E.S.

Nees, T.R.

Smith Jr., H.A.

Ward, T.E.

English

IUScholarWorks

STUDIES OF 495Z551 AND N>50 NUCLEI AT INTERMEDIATE ENERGIES 
H.A. Smith, Jr., T.E. Ward, C.M. Castaneda, T.R. Nees, and E.S. Macias* 
A s  groundwork f o r  t he  eventual  spec t roscopic  
study of t h e  l i g h t  indium iso topes  by ( 6 ~ i , x n )  
reac t ions ,  we have bombarded seve ra l  l i g h t  Pd 
t a r g e t s  wi th  6 ~ i  beams of energies  from 55 t o  
100 MeV and have obtained extens ive  e x c i t a t i o n  
funct ion  data.  The po r t i on  of t h i s  d a t a  which 
shows the  production of t he  l i g h t  I n  i so topes  
i s  shown i n  Figures l a  and l b ,  f o r  bombardment 
of lo4pd and lo6pd, respect ive ly .  Our b a s i c  
measurements have been 1 )  in-beam prompt and 
inter-beam-burst y-ray spec t r a  and 2)  o f f - l i n e  
r e s idua l  a c t i v i t y  measurements on the  bombarded 
t a rge t s .  I so topes  produced i n  t he  bombardments 
were i d e n t i f i e d  by t h e i r  known in-beam y rays 
o r  t h e i r  known decay p rope r t i e s ,  and production 
cross  s ec t ions  were determined mainly from 
decay d a t a  f o r  which the re  i s  l e s s  uncer ta in ty  
concerning y-ray branching i n t e n s i t i e s .  
The 6~ i - induced  r eac t ions  measured i n  t h i s  
work were dominated by the  charged-part icle 
emission channels, a t  t he  expense of substan- 
t i a l  y i e l d  of l i g h t  I n  nucle i .  Production 
6 of I n  i so topes  l i g h t e r  than lo61n by ( Li,xn) 
reac t ions  t he re fo re  seems imprac t ica l .  A s  i s  
evident  from Figure 1, t h e  lo61n production 
cross  s ec t ion  i s  reasonably l a r g e  (approximately 
0 .1  barn) f o r  55-MeV bombardment of lo4pd, and 
so  f u r t h e r  s tudy of t h e  in-beam production of 
t h i s  nucleus is i n  progress.  I d e n t i f i c a t i o n  of 
poss ib le  in-beam lo61n y rays  is proceeding, based 
on the  in-beam e x c i t a t i o n  funct ion  d a t a  a l ready 
acquired. Furthermore, we have acquired approximately 
20 x l o6  events of four-parameter y-y coincidence 
da t a  from the  55-MeV bombardment of lo4pd, and ana lys i s  
of t h i s  da t a  is  a l s o  i n  progress.  
Fur ther  s tudy of lo61n and poss ib l e  ex tens ions  
t o  l i g h t e r  I n  i so topes  w i l l  be ca r r i ed  out  using 
sho r t - l i f e t ime  decay spec t roscopic  techniques.  These 
s t u d i e s  w i l l  await  t he  i n s t a l l a t i o n  and t e s t i n g  of 
our  He-jet r e c o i l  t r anspor t  system, which has  been 
b u i l t  and which should be opera t ing  i n  t h e  next  few 
months. 
* Washington Univers i ty ,  S t .  Louis, Missouri 63130. 
Production of Light  I n  Isotopes by ( 6 ~ i , x n )  
6 ~ i  ENERGY (MeV) 
Figure 1. 


Studies of 49≤Z≤51 and N≥50 Nuclei at Intermediate Energies

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Studies of 49≤Z≤51 and N≥50 Nuclei at Intermediate Energies

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