β-decay half-life of 70Kr: A bridge nuclide for the rp process beyond A=70

M. Oinonen, J. Äystö, A. Jokinen, P. Baumann, F. Didierjean, A. Huck, A. Knipper, M. Ramdhane, G. Walter, M. Huyse, P. Van Duppen, G. Marguier, Yu. Novikov, A. Popov, D. M. Seliverstov, and H. Schatz (ISOLDE Collaboration)
Phys. Rev. C 61, 035801 – Published 14 February 2000
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Abstract

The β-decay half-life of 70Kr has been measured for the first time at the ISOLDE PSB Facility at CERN. Mass separated 70Kr ions were produced by 1 GeV proton-induced spallation reactions in a Nb foil. The measured half-life is 57(21) ms. This value is consistent with the half-life calculated assuming a pure Fermi decay, but is clearly lower than the value used in a recent rp-process reaction flow calculation. The result shows that the reaction flow via two-proton-capture of 68Se is 2.5 times faster than previously calculated assuming an astrophysical temperature of 1.5 GK and a density of 106g/cm3.

  • Received 1 June 1999

DOI:https://doi.org/10.1103/PhysRevC.61.035801

©2000 American Physical Society

Authors & Affiliations

M. Oinonen* and J. Äystö

  • Department of Physics, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland

A. Jokinen

  • CERN, EP Division, CH-1211 Geneva 23, Switzerland

P. Baumann, F. Didierjean, A. Huck, A. Knipper, M. Ramdhane, and G. Walter

  • Institut de Recherches Subatomiques, F-67037 Strasbourg cedex 2, France

M. Huyse and P. Van Duppen

  • Instituut voor Kern- en Stralingsfysica, University of Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium

G. Marguier

  • IPN, CNRS-IN2P3, Université Claude Bernard, F-69622 Villeurbanne, France

Yu. Novikov, A. Popov, and D. M. Seliverstov

  • St. Petersburg Nuclear Physics Institute, Gatchina, RU-188350 St. Petersburg, Russia

H. Schatz

  • Gesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, Germany

  • *Present address: CERN, EP Division, CH-1211 Geneva 23, Switzerland; Markku.Oinonen@cern.ch
  • Present address: Department of Physics, University of Jyväskylä, FIN-40351 Jyväskylä, Finland.

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Vol. 61, Iss. 3 — March 2000

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