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

Caskey, G.

Friesel, D.L.

Galonsky, A.

Nadasen, A.

Schwandt, P.

Warner, R.E.

English

IUScholarWorks

DEUTERON DETECTION EFFICIENCY OF Ge TELESCOPES 
D.L. F r i e s e l  and P. Schwandt 
Indiana Univers i ty  Cyclotron F a c i l i t y ,  Bloomington, Indiana 47405 
G. Caskey and A. Galonsky 
Cyclot ron Laboratory,  Michigan S t a t e  Univers i ty ,  Eas t  Lansing, Michigan 48824 
A. Nadasen 
Unive r s i ty  of Michigan, Dearborn, Michigan 48128 
R.E. Warner 
Ober l in  College,  Ober l in ,  Ohio 44074 
In te rmed ia t e  energy protons  and deuterons  Ep-Ed plane corresponding t o  f u l l  proton energy 
sometimes depos i t  l e s s  than t h e i r  f u l l  energy i n  Ge depos i t ion  were analysed. The deuteron l o s s  f a c t o r  is  
d e t e c t o r s .  Substandard pulse  he igh t s  r e s u l t  when j u s t  t he  r a t i o  of deuterons  depos i t ing  l e s s  than f u l l  
de t ec t ed  p a r t i c l e s  undergo i n e l a s t i c  i n t e r a c t i o n s  o r  energy t o  the  t o t a l  number of events .  Proton l o s s  
e x i t  prematurely from the  te lescope a f t e r  mul t ip l e  measurements were s i m i l a r  except t h a t  t he  deuteron 
s c a t t e r i n g  o r  large-angle e l a s t i c  s c a t t e r i n g .  t e l e scope ' s  s o l i d  angle  was only 0.14 t imes a s  l a r g e  a s  
Cor rec t ions  f o r  such l o s s e s  must be made when Ge t h a t  of t he  proton te lescope;  t hus  the  deuteron 
counter  t e l e scopes  a r e  used t o  measure abso lu te  c ross  t e l e scope  con t ro l l ed  the  e f f e c t i v e  s o l i d  angle.  
s e c t i o n s .  The deuteron l o s s  f r a c t i o n  was measured f o r  35 t o  
Car lson e t  a1.l  measured the  f r a c t i o n  of 25 t o  50 90 MeV deuterons  de tec t ed  i n  a t e l e scope  having two 
MeV protons  l o s t  i n  i n e l a s t i c  processes.  They a l s o  coun te r s  of nominal th ickness  2 and 11 mm, and f o r  105 
c a l c u l a t e d  t h i s  q u a n t i t y  from 0 t o  150 MeV, and va lues  MeV deuterons  i n  a t e l e scope  whose £ i r s t  two coun te r s  
t o  500 MeV were given by ~ a n n i . ~  No s i m i l a r  da t a  e x i s t  were 13 and 15 mm th ick .  A l l  d e t e c t o r s  have a 25 mm 
f o r  deuterons.  Moreover, e l a s t i c  l o s s e s  must be u s e f u l  diameter.  The l o s s  f r a c t i o n  increased from 
considered f o r  both protons3 and deuterons ,  and these  0.041 + 0.004 a t  35 MeV t o  0.20 + 0.01 a t  105 MeV. 
l o s s e s  depend upon the  te lescope geometry when the  Proton l o s s e s  of 0.137 + 0.004 a t  80 MeV and 0.25 
p a r t i c l e  range exceeds the  d e t e c t o r  radius .  + 0.01 a t  130 MeV were measured i n  a t e l e scope  
A CD2 t a r g e t  was bombarded with 160 MeV protons ,  con ta in ing  th ree  coun te r s  13, 15, and 15 mm th ick .  
and protons  and deuterons  from e l a s t i c  p-td s c a t t e r i n g  These i n c l u s i v e  ( i n e l a s t i c  p lus  e l a s t i c )  l o s s e s  exceed 
were de tec t ed  i n  coincidence. Losses were determined the  i n e l a s t i c  l o s s  f a c t o r s  of 0.084 and 0.157, 
from a n a l y s i s  of t he  two-dimensional energy spec t r a .  r e s p e c t i v e l y ,  g iven by Jann i  . 
For deuteron l o s s  measurements the  two t e l e scopes  had 
1 )  F. Carlson e t  a l . ,  Nucl. I n s t r .  and Meth. 188, 465 
i d e n t i c a l  de f in ing  ape ra tu res .  However, t he  two-body (1981). 
k inemat ics  g ive  dfld/dep=0.6. Thus the  d e t e c t i o n  of a 2) J.F. J ann i ,  Technical Report AFWL-TR-65-150, Air 
Force Veapons Laboratory,  K i r t l and ,  New Mexico, 
fu l l -energy proton s i g n a l  i nd ica t ed  t h a t  t he  a s soc ia t ed  1966. 
deuteron went c l ean ly  through i t s  a p e r t u r e  without 3) J . N .  Pa lmier i  and J.C.  Wolfe, Nucl. I n s t r .  and 
Meth. 5, 55 (1969). 
s c rap ing  the  edges. Events ly ing  i n  t h a t  s t r i p  i n  the  


Deuteron Detection Efficiency of Ge Telescopes

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Deuteron Detection Efficiency of Ge Telescopes

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