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High-spin structures of La-138(57)81

A. Astier 1 T. Konstantinopoulos 2 M. G. Porquet 2 M. Houry R. Lucas C. Theisen
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
Abstract : Odd-odd La-138 nuclei have been produced in the C-12+U-238 fusion-fission reaction and their. rays studied with the Euroball array. The high-spin level scheme has been built up to similar to 4.5 MeV excitation energy and spin I similar to 16 similar to from the triple gamma-ray coincidence data. An isomeric state lying at 739-keV excitation energy has been identified. The configurations of the structures are first discussed by analogy with the proton excitations identified in the semimagic La-139(82) nucleus, which involve the three high-j orbits lying above the Z = 50 gap, pi g(7/2), pi(5/2), and pi h(11/2). The competition of these three orbits to produce the yrast line is confirmed by the results of shell-model calculations performed in this work.
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Submitted on : Wednesday, June 4, 2014 - 5:42:26 PM
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A. Astier, T. Konstantinopoulos, M. G. Porquet, M. Houry, R. Lucas, et al.. High-spin structures of La-138(57)81. Physical Review C, American Physical Society, 2014, 89, pp.034310. ⟨10.1103/PhysRevC.89.034310⟩. ⟨in2p3-01001741⟩



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