Measurement of astrophysically important excitation energies of 58 Zn with GRETINA

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




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.

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