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Multi-particle emission in the decay of $^{31}$Ar

Abstract : A multi-hit capacity setup was used to study the decay of the dripline nucleus 31Ar, produced at the ISOLDE facility at CERN. A spectroscopic analysis of the beta-delayed three-proton decay of 31Ar is presented for the first time together with a quantitative analysis of the beta-delayed two-proton-gamma-decay. A new method for determination of the spin of low-lying levels in the beta-proton-daughter 30S using proton-proton angular correlations is presented and used for the level at 5.2 MeV, which is found to be either a 3+ or 4+ level, with the data pointing towards the 3+. The half-life of 31Ar is found to be 15.1(3) ms. An improved analysis of the Fermi beta-strength gives a total measured branching for the beta-3p-decay of 3.60(44) %, which is lower than the theoretical value found to be 4.24(43) %. Finally the strongest gamma-transitions in the decay of 33Ar are shown including a line at 4734(3) keV associated to the decay of the IAS, which has not previously been identified.
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http://hal.in2p3.fr/in2p3-00950155
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Submitted on : Friday, February 21, 2014 - 9:05:01 AM
Last modification on : Friday, November 13, 2020 - 7:54:02 AM

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G. T. Koldste, Bertram Blank, M. J. G. Borge, J. A. Briz, M. Carmona-Gallardo, et al.. Multi-particle emission in the decay of $^{31}$Ar. Physical Review C, American Physical Society, 2014, 89, pp.064315. ⟨10.1103/PhysRevC.89.064315⟩. ⟨in2p3-00950155⟩

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