Nuclear Seminar

Measurements of Nuclear Astrophysics Reactions in CIAE

Professor W.P. Liu
CIAE, China Institute of Atomic Energy

Monday, August 4, 2008   4:00 p.m.   NSH 124
(Refreshments served prior to seminar in NSH 124)

 

To account for the short half and extremely low reaction cross section, novel indirect approach is often the only solution. One of such approach is using direct reaction which involves same proton or neutron transfer as in radiation capture, by using the beams of low energy unstable nuclei. This technique uses DWBA analysis of experimental angular distribution to extract asymptotic normalization constants or nuclear spectroscopic factors. Then this radical contribution is inserted to capture rates calculations. This approach is tested to be reliable with the precision mainly limited by the ambiguity of optical potentials.

This talk will summarize the nuclear astrophysical studies using the unstable ion beam facility GIRAFFE in CIAE, by indirect measurements. We measured the angular distributions for some single proton or neutron transfer reactions, such as ⁷Be(d,n)⁸B, ¹¹C(d,n)¹²N, ⁸Li(d,p)⁸Li etc, in inverse kinematics, and derived the astrophysical S-factors or reaction rates of relevant (p,g) and (n,g) reactions by asymptotic normalization coefficient, spectroscopic factor, and R-matrix approach at astrophysical relevant energies.