α -unbound levels in Ar 34 from Ar 36 (p,t) Ar 34 reaction measurements and implications for the astrophysical S 30 (α,p) Cl 33 reaction rate

A. M. Long, T. Adachi, M. Beard, G. P.A. Berg, M. Couder, R. J. Deboer, M. Dozono, J. Görres, H. Fujita, Y. Fujita, K. Hatanaka, D. Ishikawa, T. Kubo, H. Matsubara, Y. Namiki, S. O'Brien, Y. Ohkuma, H. Okamura, H. J. Ong, D. PatelY. Sakemi, Y. Shimbara, S. Suzuki, R. Talwar, A. Tamii, A. Volya, T. Wakasa, R. Watanabe, M. Wiescher, R. Yamada, J. Zenihiro

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Abstract

The S30(α,p)Cl33 reaction has been identified in several type-1 x-ray burst (XRB) sensitivity studies as a significant reaction within the αp process, possibly influencing not only the abundances of burst ashes but also the bolometric shape of double-peaked light curves coming from certain XRB systems. Given the dearth of experimental data on the S30(α,p) Cl33 reaction at burst temperatures, we have performed high energy-resolution forward-angle Ar36(p,t)Ar34 measurements in order to identify levels in Ar34 that could appear as resonances in the S30(α,p)Cl33 reaction. Energies of levels identified in this work, along with model-based assumptions for spin assignments and spectroscopic factors, were then used to determine a rate for the S30(α,p)Cl33 reaction based on a narrow-resonance formalism. The rates determined in this work are then compared with two standard Hauser-Feshbach model predictions over a range of XRB temperatures.

Original languageEnglish
Article number054613
JournalPhysical Review C
Volume97
Issue number5
DOIs
Publication statusPublished - May 22 2018

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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