CERN Accelerating science

Article
Report number	arXiv:1402.4620
Title	Multi-particle emission in the decay of $^{31}$Ar
Author(s)	Koldste, G.T. (Aarhus U.) ; Blank, B. (CENBG, Gradignan) ; Borge, M.J.G. (CSIC, Madrid) ; Briz, J.A. (CSIC, Madrid) ; Carmona-Gallardo, M. (CSIC, Madrid) ; Fraile, L.M. (Madrid U.) ; Fynbo, H.O.U. (Aarhus U.) ; Giovinazzo, J. (CENBG, Gradignan) ; Grann, B.D. (Aarhus U.) ; Johansen, J.G. (Aarhus U.) ; Jokinen, A. (Jyvaskyla U.) ; Jonson, B. (Chalmers U. Tech.) ; Kurturkian-Nieto, T. (CENBG, Gradignan) ; Kusk, J.H. (Aarhus U.) ; Nilsson, T. (Chalmers U. Tech.) ; Perea, A. (CSIC, Madrid) ; Pesudo, V. (CSIC, Madrid) ; Picado, E. (Madrid U. ; Heredia U.) ; Riisager, K. (Aarhus U.) ; Saastamoinen, A. (Jyvaskyla U.) ; Tengblad, O. (CSIC, Madrid) ; Thomas, J.C. (GANIL) ; Van de Walle, J. (CERN)
Publication	2014-06-25
Imprint	19 Feb 2014
Number of pages	12
Note	Comments: 12 pages, 14 figures 12 pages, 14 figures
In:	Phys. Rev. C 89 (2014) 064315
DOI	10.1103/PhysRevC.89.064315
Subject category	Nuclear Physics - Experiment
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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