Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

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A. I. Levon, I. B. Kovgar, Yu. V. Nosenko, V. A. Onischuk, A. A. Schevchuk

Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine

Abstract: Integral perturbed angular distribution method in an external magnetic field has been used to measure the g-factors of isomers in the ^190,192,194Pt, populated in the (α, 2n)-reaction. The results are as follows: ¹⁹⁰Pt, g(12⁺) = -0.17(12), g(10^-) = -0.0016(36), g(7^-) = +0.62(9); ¹⁹²Pt, g(12⁺) = -0.18(9), g(10^-) = -0.0012(10), g(7^-) = 0.48(12); ¹⁹⁴Pt, g(12⁺, new assignment) = 0.17(7), g(7^-) = +0.26(8). The 12⁺ states have the rotational-aligned (νi ^-2_13/2) structure. The missing rotation-aligned (νi^-2_13/2)12⁺ state is suggested to be isomeric in ¹⁹⁴Pt (instead of the 10⁺ state) and to which the g = -0.17(6) value has to be attributed. From the g-factors of the 10^- states in ¹⁹⁰Pt and ¹⁹²Pt, which have the configuration ν9/2-[505]⊗ ν11/2⁺[615], the anomalous g_l-factor for neutrons has been derived as δg_l = -0.028(6). Positive values of g-factors of the 7^- isomers confirm the prediction of the non-axial rotor + 2 quasiparticles model about the change of the intrinsic structure from mainly (νi_13/2, νj) to mainly (πh_11/2, πj) in transition from Hg to Pt nuclei.

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