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Low-lying magnetic dipole strength distribution in the γ-soft even-even 130-136Ba

  • Nuclear Structure and Reactions
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Abstract.

In this study the scissors mode 1+ states are systematically investigated within the rotational invariant Quasiparticle Random Phase Approximation (QRPA) for 130-136Ba isotopes. We consider the 1+ vibrations generated by the isovector spin-spin interactions and the isoscalar and isovector quadrupole-type separable forces restoring the broken symmetry by a deformed mean field according to A.A. Kuliev et al. (Int. J. Mod. Phys. E 9, 249 (2000)). It has been shown that the restoration of the broken rotational symmetry of the Hamiltonian essentially decreases the B(M1) value of the low-lying 1+ states and increases the collectivization of the scissors mode excitations in the spectroscopic energy region. The agreement between the calculated mean excitation energies as well as the summed B(M1) value of the scissors mode excitations and the available experimental data of 134Ba and 136Ba is rather good. A destructive interference between the orbit and spin part of the M1 strength has been found for barium isotopes near the shell closer. For all the nuclei under investigation, the low-lying M1 transitions have ΔK = 1 character as it is the case for the well-deformed nuclei.

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Authors and Affiliations

  1. Faculty of Arts and Sciences, Sakarya University, 54100, Adapazari, Turkey

    E. Guliyev, F. Ertuğral & A. A. Kuliev

  2. Institute of Physics, Academy of Sciences, H. Cavid Avenue 33, Baku, Azerbaijan

    E. Guliyev

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  1. E. Guliyev
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  2. F. Ertuğral
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  3. A. A. Kuliev
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Correspondence to E. Guliyev.

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G. Orlandini

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Guliyev, E., Ertuğral, F. & Kuliev, A.A. Low-lying magnetic dipole strength distribution in the γ-soft even-even 130-136Ba. Eur. Phys. J. A 27, 313–320 (2006). https://doi.org/10.1140/epja/i2004-10309-0

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  • DOI: https://doi.org/10.1140/epja/i2004-10309-0

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