Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 5: Nuclear Astrophysics I

HK 5.5: Vortrag

Montag, 27. März 2017, 18:00–18:15, F 33

Bypassing ⁵⁶Ni: a new ⁵⁵Ni(p,γ) rate and its implications on the rp-process — •Christoph Langer^1,2, Wei Jia Ong², Fernando Montes², and Hendrik Schatz² for the e11024 collaboration — ¹Goethe University Frankfurt a. M. — ²NSCL, Michigan State University

The observed light curve emitted during an X-Ray burst is predominantly shaped by details of the rapid proton capture process (rp process). A major waiting point is ⁵⁶Ni. Processing beyond this important isotope is very sensitive to the temperature and density conditions during the burst. In this work we present a possibility to efficiently bypass ⁵⁶Ni by processing along the N=27 isotones up to the dripline. Here, the ⁵⁵Ni(p,γ)⁵⁶Cu reaction rate is important. The rate is dominantly determined by proton capture into states just above the proton separation threshold of ⁵⁶Cu. For the first time, we reconstructed the low-lying level scheme of ⁵⁶Cu using the powerful next-generation γ-ray array GRETINA in conjunction with the S800 spectrograph at the NSCL at MSU. This talk will present the results and discuss the impact on the rp process using detailed network calculations for realistic burst conditions.

This work benefited from support by the National Science Foundation under Grant No. PHY-1430152 (JINA Center for the Evolution of the Elements).