Measurement of astrophysically important excitation energies of 58 Zn with GRETINA

  • Langer C
  • Montes F
  • Aprahamian A
  • et al.
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Abstract

The level structure of proton-rich 58Zn has been measured with the next-generation γ-ray tracking array GRETINA in conjunction with the large-acceptance spectrometer S800 at the National Supercon- ducting Cyclotron Laboratory at MSU. 58Zn is expected to play an important role in the rapid proton capture process (rp process) during Type Ia X-ray bursts. 58Zn is located in the vicinity of doubly-magic 56Ni, which is a waiting point for further processing of the rp process. The reaction 57Cu(p,γ)58Zn de- termines the effective lifetime of 56Ni since the electron-capture lifetime of 56Ni is larger than 1000 s and 56Ni is in (p,γ) - (γ,p) equilibrium with 57Cu at typical rp-process temperatures. Proton capture on 57Cu is the only open break-out reaction channelwithin typical burst timescales. So far, the ratewas only calculated theoretically with large uncertainties due to the unknown level structure of 58Zn. The presen- tation will focus on the details of the study and present the extracted level scheme of 58Zn. Moreover, the astrophysical implications will be discussed.

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Langer, C., Montes, F., Aprahamian, A., Bardayan, D. W., Bazin, D., Brown, B. A., … Zegers, R. G. T. (2014). Measurement of astrophysically important excitation energies of 58 Zn with GRETINA . EPJ Web of Conferences, 66, 07013. https://doi.org/10.1051/epjconf/20146607013

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