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.
@article{arxiv.1402.4620,
title = {Multi-particle emission in the decay of 31Ar},
author = {G. T. Koldste and B. Blank and M. J. G. Borge and J. A. Briz and M. Carmona-Gallardo and L. M. Fraile and H. O. U. Fynbo and J. Giovinazzo and B. D. Grann and J. G. Johansen and A. Jokinen and B. Jonson and T. Kurturkian-Nieto and J. H. Kusk and T. Nilsson and A. Perea and V. Pesudo and E. Picado and K. Riisager and A. Saastamoinen and O. Tengblad and J. -C. Thomas and J. Van de Walle},
journal= {arXiv preprint arXiv:1402.4620},
year = {2014}
}