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Phys. Rev. Lett. 93, 161104 (2004) [4 pages]

Mass Measurement on the rp-Process Waiting Point 72Kr

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D. Rodríguez1,*, V. S. Kolhinen2, G. Audi3, J. Äystö2, D. Beck1, K. Blaum1,4, G. Bollen5, F. Herfurth1, A. Jokinen2, A. Kellerbauer4, H. -J. Kluge1, M. Oinonen6, H. Schatz5,7, E. Sauvan4,†, and S. Schwarz5
1GSI, Planckstraße 1, 64291 Darmstadt, Germany
2University of Jyväskylä, P.O. Box 35, 40351 Jyväskylä, Finland
3CSNSM-IN2P3-CNRS, 91405 Orsay-Campus, France
4CERN, Physics Department, 1211 Geneva 23, Switzerland
5NSCL and Dept. of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1321, USA
6Helsinki Institute of Physics, P.O. Box 64, 00014 University of Helsinki, Finland
7Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824-1321, USA

Received 19 June 2004; published 14 October 2004

The mass of one of the three major waiting points in the astrophysical rp process 72Kr was measured for the first time with the Penning trap mass spectrometer ISOLTRAP. The measurement yielded a relative mass uncertainty of δm/m=1.2×10-7 (δm=8  keV). 73,74Kr, also needed for astrophysical calculations, were measured with more than 1 order of magnitude improved accuracy. We use the ISOLTRAP masses of 72–74Kr to reanalyze the role of 72Kr (T1/2=17.2  s) in the rp process during x-ray bursts and conclude that 72Kr is a strong waiting point delaying the burst duration with at least 80% of its β-decay half-life.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.161104
DOI:
10.1103/PhysRevLett.93.161104
PACS:
26.30.+k, 21.10.Dr, 27.50.+e, 32.10.Bi

*Present address: IN2P3, LPC-ENSICAEN, 6 Boulevard du Marechal Juin, 14050, Caen Cedex, France.

Electronic address: rodriguez@lpccaen.in2p3.fr.

†Present address: IN2P3, CPPM, 13288 Marseille, France

 
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