A Study of the 30S(alpha,p)33Cl Reaction Rate

C. M. DEIBEL; C. L. JIANG; B. P. KAY; H. Y. LEE; R. C. PARDO; K. E. REHM; C. UGALDE; A. WOODARD; J. M. FIGUEIRA; S. T. MARLEY; N. PATEL; M. PAUL; A. WUOSMAA

Waikoloa, Hawaii, USA

Encuentro; 3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan; 2009

The 30S(alpha;p)33Cl reaction rate has major implications for x-ray bursts (XRBs). No experimental information exists for this reaction rate, though XRB models have shown that it affects final isotopic abundances and the total energy output [2]. This rate may also in°uence XRB observables such as the structure of double-peaked luminosity curves [3] and the composition of the neutron star crust [4]. We have studied the time-inverse reaction p(33Cl,30S)alpha at ATLAS using a radioactive 33Cl beam. The residual 30S nuclei were detected at the focal plane of the split-pole spectrograph, which was used in gas-filled mode, in coincidence with the alpha particles, which were detected in a double-sided Si detector. The experimental results and conclusions about the impact on XRB nucleosynthesis will be discussed.[1] This work was supported under JINA grant No. PHY0822648 and U.S.DOE contract DE-AC02-06CH11357.[2] A. Parikh et al., ApJ SS 178, 110 (2008).[3] J.L. Fisker et al., ApJ 608, L61 (2004).[4] H. Schatz and K.E. Rehm, NPA 777, 601 (2006).