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Low-spin structure of $^{86}_{35}$Br$_{51}$ and $^{86}_{36}$Kr$_{50}$ nuclei: The role of the g $_{7/2}$ neutron orbital

Abstract : Low-spin excited levels in Br513586 and Kr503686, populated following β− decay and the neutron-induced fission of U235, were measured using the Lohengrin fission-fragment separator and the EXILL array of Ge detectors at the PF1B cold-neutron facility of the Institute Laue-Langevin Grenoble. Improved populations of excited levels in Br86 remove inconsistencies existing in the literature on this nucleus. Directional-linear-polarization correlations, analyzed using newly developed formulas, as well as precise angular correlations allowed the unique 1− and 2− spin and parity assignments to the ground state of Br86 and the 4016.3-keV level in Kr86, respectively. Based on these results we propose that the Gamow-Teller β− decays of Se86 and Br86 involve the νg7/2→πg9/2 transition in addition to the νp3/2→πp3/2 transition proposed earlier. In Kr86 we have identified 1+1, 2+3, and 3+1 levels, analogous to the mixed-symmetry states in Mo94, which in Kr86 are from proton excitations, only. Large-scale, shell-model calculations with refined interactions reproduce well excitations in Br86 and Kr86 and support our interpretations.
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Submitted on : Monday, October 31, 2016 - 6:31:26 PM
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W. Urban, K. Sieja, T. Materna, M. Czerwinski, T. Rzaca-Urban, et al.. Low-spin structure of $^{86}_{35}$Br$_{51}$ and $^{86}_{36}$Kr$_{50}$ nuclei: The role of the g $_{7/2}$ neutron orbital. Physical Review C, American Physical Society, 2016, 94 (4), pp.044328. ⟨10.1103/PhysRevC.94.044328⟩. ⟨in2p3-01390146⟩