Spectroscopy of neutron-rich P34,35,36,37,38 populated in binary grazing reactions

Abstract : The neutron-rich nuclei P34,35,36,37,38 were populated in binary grazing reactions initiated by a beam of S36 ions at 215 MeV incident on a thin Pb208 target. The combination of the PRISMA magnetic spectrometer and the CLARA array of escape-suppressed Ge detectors was used to detect γ rays in coincidence with projectile-like nuclear species. Further evidence to support the observed γ decay of excited states of the populated phosphorus isotopes is provided by γ−γ coincidence measurements based on the results of an earlier thick-target deep-inelastic experiment. Level schemes for P34,35,36,37,38 are presented and discussed within the context of state-of-the-art shell-model calculations. In particular, new spin and parity assignments are proposed for a number of excited states of P36. The evolution with neutron number of the energy difference of the low-lying Jπ=3/2+ and 1/2+ states in the odd-A isotopes of phosphorus, as well as the relationship to nuclear collectivity, is discussed. The evolution with neutron number of the shell-model wave functions of the first Jπ=1/2+, 3/2+, and 5/2+ states of the odd-A phosphorus isotopes and of the first Jπ=3−, 4−, and 5− states of the even-A isotopes is also explored.
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Article dans une revue
Physical Review C, American Physical Society, 2015, 92 (4), pp.044308. 〈10.1103/PhysRevC.92.044308〉
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Soumis le : mercredi 16 décembre 2015 - 11:29:48
Dernière modification le : mercredi 31 janvier 2018 - 12:12:36

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R. Chapman, A. Hodsdon, M. Bouhelal, F. Haas, X. Liang, et al.. Spectroscopy of neutron-rich P34,35,36,37,38 populated in binary grazing reactions. Physical Review C, American Physical Society, 2015, 92 (4), pp.044308. 〈10.1103/PhysRevC.92.044308〉. 〈in2p3-01244782〉

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