Production and $\beta$ decay of rp-process nuclei ${}^{96}$Cd, ${}^{98}$In and ${}^{100}$Sn

Abstract

The $\beta$-decay properties of the N=Z nuclei ${}^{96}$Cd, ${}^{98}$In and ${}^{100}$Sn have been studied. These nuclei were produced at the National Superconducting Cyclotron Laboratory (NSCL) by fragmenting a 120 MeV/nucleon ${}^{112}$Sn primary beam on a Be target. The resulting radioactive beam was filtered in the A1900 and the newly commissioned Radio Frequency Fragment Separator (RFFS) to achieve a purity level suitable for decay studies. The observed production cross sections of these nuclei are lower than predicted by factors of 10 to 30. The ${}^{100}$Sn production cross section is 0.25(15) pb, in sharp contrast with the 120 pb lower limit established at 63 MeV/nucleon incident energy of the same primary beam. The deduced half-life of ${}^{100}$Sn is 0.55${}_{-0.31}^{+0.70}$ s, in agreement with previous measurements. Two $\beta$-decaying states in ${}^{98}$In were observed with measured half-lives of 47(13) ms and 0.66(40) s. The half-life of ${}^{96}$Cd, which was the last experimentally unknown waiting point half-life of the astrophysical rp-process, is 1.03${}_{-0.21}^{+0.24}$ s. The implications of the experimental T${}_{1/2}$ value of ${}^{96}$Cd on the abundances predicted by rp-process calculations and the origin of A=96 isobars such as ${}^{96}$Ru are explored.

References in corpus (4)

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• Exposing the Nuclear Burning Ashes of Radius Expansion Type I X-ray Bursts
• Gamow-Teller Strength in the Region of ${}^{100}$Sn

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