Half-lives of ground and isomeric states in Cd and the astrophysical origin of Ru |
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| Authors: | G. Lorusso A. Becerril A. Amthor T. Baumann D. Bazin J.S. Berryman B.A. Brown R.H. Cyburt H.L. Crawford A. Estrade A. Gade T. Ginter C.J. Guess M. Hausmann G.W. Hitt P.F. Mantica M. Matos R. Meharchand K. Minamisono F. Montes G. Perdikakis J. Pereira M. Portillo H. Schatz K. Smith J. Stoker A. Stolz R.G.T. Zegers |
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| Affiliation: | 1. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA;2. Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824, USA;3. Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA;4. Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA |
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| Abstract: | First experimental evidence for a high-spin isomer (25/2+) in 97Cd, a waiting point in the astrophysical rapid proton capture process, is presented. The data were obtained in β-decay studies at NSCL using the new RF Fragment Separator system and detecting β-delayed protons and β-delayed γ rays. Decays from ground and isomeric states were disentangled, and proton emission branches were determined for the first time. We find half-lives of 1.10(8) s and 3.8(2) s, and β-delayed proton emission branches of 12(2)% and 25(4)% were deduced for the ground and isomeric states, respectively. With these results, the nuclear data needed to determine an rp-process contribution to the unknown origin of solar 96Ru are in place. When the new data are included in astrophysical rp-process calculations, one finds that an rp-process origin of 96Ru is unlikely. |
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| Keywords: | 97Cd rp-process Spin-gap isomer β-delayed proton decay X-ray burst p-nuclei |
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