Identification of low-energy isovector octupole states in $^{144}$Nd

M. Thurauf M. Scheck C. Bernards A. Blanc 1 N. Cooper G. de France 2 M. Jentschel 1 J. Jolie O. Kaleja U. Koster 1 T. Kroll P. Mutti 1 G.S. Simpson 3 T. Soldner 1 M. Tezgel W. Urban J. Vanhoy M. Werner V. Werner K.O. Zell
1 ILL - Institut Laue-Langevin
2 GANIL - Grand Accélérateur National d'Ions Lourds
3 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
Abstract : Recently, first candidates for low-lying isovector states in the octupole sector were suggested. The unambiguous identification of those states will contribute to the decomposition of the octupole-octupole residual interaction in an isoscalar and isovector part. This will help us understand the octupole degree of freedom. In 144Nd the 3− state at 2778 keV is a good candidate for such a "mixed-symmetry'' octupole state. In order to clarify the nature of this state, a 143Nd(n, γ)-experiment was conducted with the EXILL-setup. Following neutron capture the 3− states are populated and EXILL provides the opportunity to determine the multipole-mixing ratios of the 3i −→31 - transitions. For the transition from the "mixed-symmetry" octupole state to the symmetric 31 − state we expect a strong M1 component.
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Submitted on : Tuesday, July 19, 2016 - 3:51:52 PM
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M. Thurauf, M. Scheck C. Bernards, A. Blanc, N. Cooper, G. de France, et al.. Identification of low-energy isovector octupole states in $^{144}$Nd. XXI International School on Nuclear Physics and Applications & International Symposium on Exotic Nuclei, Sep 2015, Varna, Bulgaria. pp.012050, ⟨10.1088/1742-6596/724/1/012050⟩. ⟨in2p3-01346790⟩

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