By the same authors

Electron capture in core-collapse supernovae investigated through configuration mixing in neutron-rich nuclei

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Published copy (DOI)

Author(s)

  • T. Baugher
  • D. Bazin
  • J. S. Berryman
  • K. A. Chipps
  • A. Gade
  • H. Iwasaki
  • A. Lemasson
  • S. McDaniel
  • A. Ratkiewicz
  • A. Shore
  • S. R. Stroberg
  • D. Weisshaar
  • K. Wimmer
  • R. Winkler

Department/unit(s)

Publication details

Title of host publicationRUTHERFORD CENTENNIAL CONFERENCE ON NUCLEAR PHYSICS
DatePublished - 2012
PublisherIOP PUBLISHING LTD
Place of PublicationBRISTOL
EditorsS Freeman, A Andreyev, A Bruce, A Deacon, D Jenkins, D Joss, D MacGregor, P Regan, J Simpson, G Tungate, B Wadsworth, D Watts
Volume381
Original languageEnglish

Abstract

Electron capture on neutron-rich medium-mass nuclei is a key process where the electrons that impede the collapse of the core of massive stars are captured, thereby producing very neutron-rich nuclei. As the core collapses, the supernova is then initiated. For the electron capture to proceed, however, the allowed Gamow-Teller (GT) transition must be unblocked either by thermal excitations or by mixing of proton configurations from a higher-lying shell into the ground-state configuration of the nucleus. The present paper presents an experiment performed at the National Superconducting Cyclotron Laboratory at Michigan State University, in which we study the configuration mixing in the neutron-rich Zn-76 isotope. The experiment utilised single-proton and single-neutron knockout with detection of reaction-residue gamma rays and measurement of the parallel momentum of the residue. Through this we investigate the proton components of the Zn-76 ground state, with a particular interest in pi-g(9/2), which may unblock the GT electron capture even at low temperatures and thereby open a new pathway for the initiation of the collapse of the pre-supernova stellar core.

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