Mass Measurements beyond the Major r-Process Waiting Point Zn80

S. Baruah, G. Audi, K. Blaum, M. Dworschak, S. George, C. Guénaut, U. Hager, F. Herfurth, A. Herlert, A. Kellerbauer, H.-J. Kluge, D. Lunney, H. Schatz, L. Schweikhard, and C. Yazidjian
Phys. Rev. Lett. 101, 262501 – Published 30 December 2008

Abstract

High-precision mass measurements on neutron-rich zinc isotopes Zn71m,7281 have been performed with the Penning trap mass spectrometer ISOLTRAP. For the first time, the mass of Zn81 has been experimentally determined. This makes Zn80 the first of the few major waiting points along the path of the astrophysical rapid neutron-capture process where neutron-separation energy and neutron-capture Q-value are determined experimentally. The astrophysical conditions required for this waiting point and its associated abundance signatures to occur in r-process models can now be mapped precisely. The measurements also confirm the robustness of the N=50 shell closure for Z=30.

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  • Received 12 September 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.262501

©2008 American Physical Society

Authors & Affiliations

S. Baruah1, G. Audi2, K. Blaum3,4,*, M. Dworschak3, S. George3,4,*, C. Guénaut2, U. Hager5,9,†, F. Herfurth3, A. Herlert1,‡, A. Kellerbauer6,*, H.-J. Kluge3,7, D. Lunney2, H. Schatz8, L. Schweikhard1, and C. Yazidjian3

  • 1Institut für Physik, Ernst-Moritz-Arndt-Universität, 17487 Greifswald, Germany
  • 2CSNSM-IN2P3-CNRS, Université de Paris Sud, Orsay, France
  • 3GSI, Planckstr. 1, 64291 Darmstadt, Germany
  • 4Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany
  • 5Department of Physics, University of Jyväskylä, P.O. Box 35 (YFL), 40014 Jyväskylä, Finland
  • 6Physics Department, CERN, 1211 Geneva 23, Switzerland
  • 7Fakultät für Physik und Astronomie, Ruprecht-Karls-Universität, 69120 Heidelberg, Germany
  • 8Department of Physics and Astronomy, NSCL, and JINA, Michigan State University, East Lansing, Michigan 48824, USA
  • 9Helsinki Institute of Physics, University of Helsinki, 00014 Helsinki, Finland

  • *Present address: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
  • Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada.
  • Present address: CERN, Physics Department, 1211 Geneva 23, Switzerland.

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Vol. 101, Iss. 26 — 31 December 2008

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