This work was supported by National Science Foundation Grants PHY 76-84033A01, PHY 78-22774, and Indiana Universit

Foster, C.C.

Goodman, C.D.

Goulding, C.A.

Greenfield, M.B.

Rapaport, J.

Schery, S.C.

Ward, T.E.

Zafiratos, C.D.

English

IUScholarWorks

A STUDY OF TBE 7 ~ i  (p ,n) 7 ~ e  EXCITATION FUNCTION AT INTERMEDIATE ENERGIES 
USING RESIDUAL ACTIVITY 
** T.E. Ward, C.A. Gouldin * M.B.  ree en field," C.C. Fos ter ,  J. Rapaport, 
C .D. Zaf i r a t o s  ,*" S. C. schery,  *** and C .D. ~oodman*** 
The ob jee t ive  of t h i s  experiment i s  t o  measure 
t h e  e x c i t a t i o n  funct ion  of t h e  7 ~ i  (p ,n)  7 ~ e  r e a c t i o n  
i n  t h e  proton energy range of Ep = 60-200 MeV. Such 
a measurement is needed t o  determine t h e  t o t a l  r eac t ion  
c ros s  s ec t ion  which i n  t h e  course of o ther  7 ~ i  s t u d i e s  
can be used f o r  c a l i b r a t i o n  purposes. 
The t o t a l  c r o s s  s e c t i o n s  a r e  determined using 
standard o f f - l i ne  y-ray de t ec t ion  techniques t o  measure 
t h e  r e s i d u a l  7 ~ e ( 5 3 d )  a c t i v i t y .  This method has  been 
used at lower energies1) and a t  120 Mev2) t o  c a l i b r a t e  
l a r g e  volume neutron de t ec to r s .  
Typically a t  each energy a 10-20 mg/cm2 enriched 
7 ~ i  t a r g e t  w i l l  be i r r a d i a t e d  with 20-100 na-hr of 
protons. Af ter  bombardment t h e  i r r a d i a t e d  t a r g e t  w i l l  
be coun ted . in  a prescr ibed  counting geometry wi th  
known y-ray e f f i c i ency .  The 7 ~ e  is i d e n t i f i e d  by its 
(10%) e l e c t r o n  capture  branch t o  t h e  477.4 keV l e v e l  
i n  7~ i .  The samples w i l l  be counted over s eve ra l  
months t o  i n su re  t h e  477.4 keV y-ray decays wi th  t h e  
7 ~ e  ha l f  -1if e of 53.3d. 
* ~ l o r i d a  A&M Univers i ty ,  Tallahassee,  F lor ida  
32307 
**0hio Univers i ty ,  Athens, Ohio 45701 
***Oak Ridge National  Laboratory, Oak Ridge, 
Tennessee 37830 
1 )  S.D. Schery, L.E. Young, R.R. Doering, S.M. Austin,  
and R.K. Bhowmik, Michigan S t a t e  Univers i ty  Report 
MSUCL-244, June 1977. 
2) C.A. Goulding, M.B. Greenfield,  D.E. Bainum, J.  
Rapaport, C.C. Fos ter ,  T.E. Ward, C.D. Za f i r a to s ,  
S.D. Schery, and C.D. Goodman, Bull .  Am. Phys. Soc. 
23 558 (1978). 
-9 


A Study of the 7-Li(p,n)7-Be Excitation Function at Intermediate Energies Using Residual Activity

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A Study of the 7-Li(p,n)7-Be Excitation Function at Intermediate Energies Using Residual Activity

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