Special Nuclear Seminar

High-precision (p,t) reactions to determine reaction rates of explosive stellar processes

Dr. Andrija Matic
Kernfysisch Versneller Instituut (KVI)

Tuesday, August 14, 2007   9:00 a.m.   NSH 124
(Refreshments served prior to seminar in NSH 124)

The aim of studying ²⁴Mg(p,t)²²Mg and ²⁸Si(p,t)26Si reactions was to investigate the nuclear structure of ²²Mg and ²⁶Si.  These two nuclei play a significant role in stellar reaction processes at high temperatures.  We performed ²⁴Mg(p,t)²²Mg and ²⁸Si(p,t)²⁶Si experiments at RCNP by using the Grand Raiden spectrometer and the WS beam line.  In this experiment we achieved an unprecedented resolution of 13 keV for (p,t) experiment and we were able to resolve 12 new levels in ²²Mg and 14 new levels in ²⁶Si.  On base of the obtained nuclear structure we calculated the stellar reaction rates for the following reactions: ¹⁸Ne(α,p)²¹Na, ²¹Na(p,γ)²²Mg,
²²Mg(α,p)²⁵Al and ²⁵Al(p,γ)²⁶Si.