Isospin symmetry in nucleon scattering fromLi6andC

Abstract

PART l AL COPYRIGHT L IZENSE I hereby g r a n t t o Simon F r a s e r U n l v e r s l t y the r i g h t t o lend my t h e s i s , p r o j e c t o r extended essay ( t h e t i t l e o f which i s shown below) t o u s e r s o f t h e Simon F r a s e r University L l b r a r y , and t o make p a r t i a l o r s i n g l e c o p i e s o n l y f o r such users o r I n response t o a r e q u e s t from t h e l i b r a r y o f any o t h e r u n l v e r s l t y , o r o t h e r e d u c a t i o n a l I n s t i t u t i o n , on i t s own b e h a l f o r f o r one o f I t s users. I f u r t h e r egree t h a t p e r m i s s i o n f o r m u l t i p l e copying o f this work f o r s c h o l a r l y purpcses may be g r a n t e d by me o r t h e Dean o f Graduate Studies. I t i s u n d e r s t m d t h a t c o p y i n g o r publication o f t h i s work f o r f i n a n c l~l gain s h a l l not be a l l o w e d w i t h o u t my w r i t t e n permission. Abstract Tests of isospin symmetry in (n,p), (p,p') and (p,n) reactions at 280 MeV for populating the T = 1 isospin triads in A=6 and A=12 nuclei have been performed at TRIUMF. DWIA calculations for the A=12 triad where the known f t asymmetry is included in the analysis show good agreement with experimental (n,p) and (p,pl) data. Similar calculations for the A=6 triad where no asymmetry was assumed show that twice the (p,pt) cross sections taken in the region q = 0.2-0.35 fm-' are slightly ((5.1 f 2.4)%) lower compared with the (p,n) and (n,p) cross sections at q = 0.1 fm-'. This asymmetry may be negligible when the data are extrapolated to q = 0. At q = 0.67 fm-' the the (n,p) cross section is = 45% larger than the (p,pt) cross section. DedicationIn memory of my parents. AcknowledgementI would like to thank Prof. Hausser for taking me on as a graduate student and for financial support during this time, and for sharing with me his wealth of knowledge and experience in all stages of the experiment and ana1ysis;and in particular for his assistance in the theoretical aspects of this work. As well, many people have assisted and advised me in many ways throughout the course of my work at TRIUMF:

Dipole and spin-dipole resonances in charge-exchange reactions onC12

“…DifFerential cross-section angular distributions for the low-lying transitions in the residual nuclei N and B show good agreement with DWIA calculations in a large angular range (see Figs. 4,6,and 8).…”