Nuclear Structure and Decay Data for A=31 Isobars

Abstract

Experimental nuclear spectroscopic data are evaluated for 11 known nuclides of mass 31 (F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K). Detailed evaluated information is presented for each reaction and decay experiment. Combining all the available data, recommended values are provided for energies, spins and parities, and half-lives of levels, with energies, branching ratios and multipolarities of γ radiations, and characteristics of β and α radiations in radioactive decays. ³¹P is the most extensively studied one among all nuclides via various reactions and decays, followed by ³¹S, ³¹Si, ³¹Mg and ³¹Al. Information for excited states in ³¹Ne, ³¹Na, ³¹Cl, ³¹Ar and ³¹K are limited; no excited states have yet been identified in ³¹F, even its ground-state half-life is unknown. Significant new data have become available for the structure of ³¹S, with its relevance to astrophysical applications. This work supersedes the earlier evaluation of A=31 by 2013Ou01, with literature cutoff date of Feb 15, 2013.