30S RI Beam Production and X-ray Bursts

Details 30S RI Beam Production and X-ray Bursts 30S RI Beam Production and X-ray Bursts

2009-04-14

arxiv.org/abs/0904.2067v1

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 3 figures. Submitted on Dec. 25, 2008 for the Proceedings of the 10th Symposium on Nuclei in the Cosmos, Mackinac Isl

Scientific paper

The present work reports the results of 30S radioactive beam development for a future experiment directly measuring data to extrapolate the 30S(alpha,p) stellar reaction rate in Type I X-ray bursts, a phenomena where nuclear explosions occur repeatedly on the surface of accreting neutron stars. We produce the radioactive ion 30S via the 3He(28Si,30S)n reaction, by bombarding a cryogenically cooled target of 3He at 400 Torr and 80 K with 28Si beams of 6.9 and 7.54 MeV/u. In order to perform a successful future experiment which allows us to calculate the stellar 30S(alpha, p) reaction rate, Hauser-Feshbach calculations indicate we require a 30S beam of ~10^5 particles per second at ~32 MeV. Based on our recent beam development experiments in 2006 and 2008, it is believed that such a beam may be fabricated in 2009 according to the results presented. We plan to measure the 4He(30S,p) cross-section at astrophysical energies in 2009, and some brief remarks on the planned (alpha,p) technique are also elucidated.

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