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Production of isomers in compound and transfer reactions with 4He ions

✍ Scribed by S.A. Karamian; J.J. Carroll; N.V. Aksenov; Y.A. Albin; G.A. Bozhikov; S.N. Dmitriev; G.Y. Starodub; G.K. Vostokin


Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
326 KB
Volume
646
Category
Article
ISSN
0168-9002

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✦ Synopsis


A well-known island of nuclear isomerism appears near A ΒΌ175-180 due to the deformation alignment of single-particle orbits at high angular momentum. This sometimes results in the formation of multiquasiparticle states with record spin that are long-lived because of ''K-hindrance'', i.e. symmetry rearrangement. Production methods and spectroscopic studies of these isomers remain a challenge for modern nuclear reaction and nuclear structure physics. In the present work, activities were produced by irradiation of 176 Yb (97.6% enriched) and nat Lu targets with 35 MeV 4 He ions from the internal beam of the U-200 cyclotron. Induced activities were analyzed by applying the methods of radiochemistry and gamma spectroscopy. Yields of the compound and nucleon-transfer reactions were measured and the isomer-to-ground state ratios were deduced. Calculated results were obtained using standard procedures to reproduce the (a, xn) cross-sections, and the systematic behavior of the nucleon-transfer yields was established. The isomer-to-ground-state ratios for direct reactions with 4 He ions were examined, resulting in a new characterization of the reaction mechanism.


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