This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440

Chen, Q.

Fatyga, M.

Jastrzebski, J.

Singh, P.P.

English

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LINEAR MOMENTUM TRANSFER I N  THE 3 ~ e  + 5 9 ~ o  REACTION AT ENERGIES BETWEEN 110 AND 270 MeV 
Q. Chen, P.P. Singh and M. Fatyga 
Ind i ana  U n i v e r s i t y  Cyclo t ron  F a c i l i t y ,  Bloomington, I nd i ana  47405 
J. J a s t r z e b s k i  
Heavy Ion  Labora tory ,  Warsaw Un ive r s i t y ,  Warsaw, Poland 
We have r e c e n t l y  submi t ted  f o r  p u b l i c a t i o n  a  F igu re  2 summarizes t h e  a v a i l a b l e  d a t a  about t h e  
paper1) i n  which t h e  r e s u l t s  of a  s t udy  of l i n e a r  average  and maximum momentum t r a n s f e r  i n  3 ~ e  + 5 9 ~ o  
momentum t r a n s f e r  i n  t h e  3 ~ e  + 5 9 ~ o  r e a c t i o n  i n  t h e  r e a c t i o n .  
energy range between 10 MeV and 146 MeV were p r e sen t ed .  
These s t u d i e s  a r e  now extended t o  t h e  h i g h e s t  3 ~ e  
energy  a v a i l a b l e  a t  IUCF. 
Informat ion  about t h e  l i n e a r  momentum t r a n s f e r  is 
ob t a ined  through t h e  measurement, f o r  t h e  r a d i o a c t i v e  
r e a c t i o n  products ,  of t h e i r  t h i c k  t a r g e t  r e c o i l  ranges  
and format ion  c r o s s  s e c t i o n s .  The average  and maximum 
I I I I 
'lie + Co 
1.0- o 116 MeV 
269 MeV 
z 0 
>* . 
\ 
>= - 
0.5- 
I. 
l i n e a r  momentum t r a n s f e r  a r e  deduced. We r e f e r  t o  I 
Refs.  1 , 2  f o r  d e t a i l s  of t he  exper imenta l  procedure  a s  
w e l l  a s  f o r  t h e  d e f i n i t i o n  of measured q u a n t i t i e s .  
Table  I ( s e e  Appendix) p r e s e n t s  t he  c ro s s  s e c t i o n s  F igu re  1. Forward v e l o c i t i e s  ( i n  compound nuc l eus  
v e l o c i t y  u n i t s )  of t h e  r a d i o a c t i v e  r e c o i l s  observed i n  
and forward r e c o i l  ranges  (FW) f o r  s i x  3 ~ e  bombarding t h e  3 ~ e  + 5 9 ~ o  r e a c t i o n  a s  a f u n c t i o n  of AA, t h e  
d i f f e r e n c e  between t a r g e t  mass and t h e  mass of a  g iven  
e n e r g i e s  i n v e s t i g a t e d  i n  t h e  p r e sen t  work. For t h r e e  product .  
bombarding e n e r g i e s  we have a l s o  determined t h e  
r I I I 1  1 1  " 1 1  
backward r e c o i l s  f o r  some r e a c t i o n  products .  The 
r a t i o s  of forward t o  backward c a t c h e r  a c t i v i t i e s  (FIB) 
a r e  a l s o  l i s t e d  i n  Table  I. 
The i n d i c a t e d  e r r o r s  r e f l e c t  t h e  sp r ead  of t h e  
measured q u a n t i t i e s  i n  s u c c e s s i v e  measurements, 
performed du r ing  about n ine  months. Add i t i ona l  
s y s t e m a t i c  e r r o r  up t o  15%,  due t o  u n c e r t a i n t y  i n  
c o l l e c t e d  charge ,  cannot be excluded f o r  t h e  c r o s s  
s e c t i o n  va lues .  The s y s t e m a t i c  e r r o r  f o r  r e c o i l  ranges  
may reach  3% due t o  t h e  t a r g e t  t h i c k n e s s  u n c e r t a i n t y .  
F igu re  1 shows, f o r  t h e  h i g h e s t  and lowes t  energy 
employed i n  t h i s  work, t h e  deduced forward v e l o c i t i e s  
( i n  compound nucleus  v e l o c i t y  u n i t s )  a s  a  f u n c t i o n  of 
AA, t h e  d i f f e r e n c e  between t a r g e t  mass and t h e  mass of 
a  g iven  r e a c t i o n  product .  
10 20 40 60 90 
E/A (MeV) 
Figu re  2. Average and maximum t r a n s f e r r e d  l i n e a r  
momentum d iv ided  by A, t h e  mass of t h e  p r o j e c t i l e ,  a s  a 
f u n c t i o n  of t h e  bombarding energy  d iv ided  by A f o r  t h e  
3 ~ e  + 5 9 ~ o  r e a c t  ion .  The round p o i n t s  a r e  from Ref. 1, 
t h e  squa re s  from t h e  p r e s e n t  work. 
Table I. Cross sections (in mb), thick target recoil ranges FW (in mg/cm2 in Co) and forward to 
backward ratios F/B for 3 ~ e  + 5 9 ~ o  reaction products 
Elab (MeV) 
115.6 136.5 166.2 
Product IS FW F/ B 13 FW d FW F/ B 
195.7 
Product d FW 
1) J. Jastrzebski et al., submitted to Phys. Rev. C. 2) J. Jastrzebski et al., Phys. Lett. 136B, 153 
( 1984) . 
66 


Linear Momentum Transfer in the 3-He + 59-Co Reaction at Energies Between 110 and 170 MeV

https://scholarworks.iu.edu/dspace/bitstream/2022/980/1/iucf_1985_65-66.pdf

Linear Momentum Transfer in the 3-He + 59-Co Reaction at Energies Between 110 and 170 MeV

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