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Spectroscopic study of the exotic nucleus 25P

Abstract : Motivated by the importance of 25P for the two-proton decay of 26S and for searches of the mirror analog of the island of inversion near N = 16, we present the first predictions for the spectroscopy of the exotic isotope 25P obtained in the shell model, a potential model, and a microscopic-cluster model. All models predict 25P to be unbound, with an energy in the range 0.78–1.03 MeV, which favors previous mass systematics over more recent revisions. We show that 25P possesses a rich low-lying spectrum that should be accessible by experimental studies. All of the predicted states below 7 MeV, except one, are narrow. Many of them are built on the excited-core states of 24Si for which the Coulomb barrier is raised. For decays into the 24Si(g.s.) + p channel we determined the proton widths based on their link to the asymptotic normalization coefficients (ANCs) of their mirror analogs in 25Ne. We determine these ANCs from the analysis of the transfer reaction 24Ne(d,p) 25Ne. The proton widths for decay into excited-state channels are obtained in model calculations. The only broad state is the intruder 3/2−, the mirror analog of which has been recently observed in 25Ne. The 25P(3/2−) energy is lower than that in 25Ne, suggesting that the island of inversion may persist on the proton-rich side. All excited states of 25P have at least two decay modes and are expected to populate variously the 2+ 1,2 and 4+ states in 24Si, which then decay electromagnetically.
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http://hal.in2p3.fr/in2p3-01117025
Contributor : Sandrine Guesnon <>
Submitted on : Monday, February 16, 2015 - 11:44:56 AM
Last modification on : Tuesday, February 19, 2019 - 9:56:01 AM

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B. Fernandez-Dominguez, X. Pereira-Lopez, N.K. Timofeyuk, P. Descouvemont, W.N. Catford, et al.. Spectroscopic study of the exotic nucleus 25P. Physical Review C, American Physical Society, 2015, 91, pp.024307. ⟨10.1103/PhysRevC.91.024307⟩. ⟨in2p3-01117025⟩

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