β -decay half-life of 70 Kr : A bridge nuclide for the rp process beyond<mml:math …
2000; American Institute of Physics; Volume: 61; Issue: 3 Linguagem: Inglês
10.1103/physrevc.61.035801
ISSN1538-4497
AutoresM. Oinonen, J. Äystö, A. Jokinen, P. Baumann, F. Didierjean, Alexander Huck, A. Knipper, M. Ramdhane, G. Walter, M. Huyse, P. Van Duppen, G. Marguier, Yu. N. Novikov, A. Popov, D. M. Seliverstov, H. Schatz,
Tópico(s)Astronomical and nuclear sciences
ResumoThe $\ensuremath{\beta}$-decay half-life of ${}^{70}\mathrm{Kr}$ has been measured for the first time at the ISOLDE PSB Facility at CERN. Mass separated ${}^{70}\mathrm{Kr}$ 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 ${}^{68}\mathrm{Se}$ is 2.5 times faster than previously calculated assuming an astrophysical temperature of 1.5 GK and a density of ${10}^{6}{\mathrm{g}/\mathrm{c}\mathrm{m}}^{3}.$
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