Study of parity-doublet structure in the $^{147}$La nucleus

Abstract : The work reports several new excited states in the neutron-rich 147La nucleus, populated in spontaneous fission of 252Cf. The excitation scheme has been reinvestigated by means of γ-ray spectroscopy, using high-fold γ coincidences measured with the Gammasphere array of Ge detectors. It is shown that the 229.65-keV level has spin and parity 11/2-, which changes the 9/2- spin-parity reported in a recent evaluation and sets up the spinparity of the ground state as 5/2+. New levels allow to arrange the excitation scheme of 147La into a parity-doublet-like structure showing that the 147La nucleus may have an octupole deformation.
Type de document :
Communication dans un congrès
6th Workshop on Nuclear Fission and Spectroscopy of Neutron-Rich Nuclei, Mar 2017, Chamrousse, France. EPJ Web Conf., 193, pp.05006, 2018, 〈10.1051/epjconf/201819305006〉
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Soumis le : mardi 11 décembre 2018 - 21:07:18
Dernière modification le : mercredi 12 décembre 2018 - 09:21:27

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J. Wiśniewski, W. Urban, T. Rząca-Urban, A.G. Smith, J.F. Smith, et al.. Study of parity-doublet structure in the $^{147}$La nucleus. 6th Workshop on Nuclear Fission and Spectroscopy of Neutron-Rich Nuclei, Mar 2017, Chamrousse, France. EPJ Web Conf., 193, pp.05006, 2018, 〈10.1051/epjconf/201819305006〉. 〈hal-01952146〉

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