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Collective structures of the 131Cs nucleus

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Abstract.

The collective structures of 131Cs have been investigated by in-beam γ-ray spectroscopic techniques following the 124Sn (^11B , 4n) reaction at a beam energy Elab = 57MeV. The previously established rotational bands, built on πg7/2, πd5/2 and the unique-parity πh11/2 orbitals, have been extended and evolve into new bands involving rotationally aligned ν(h11/2)2 and π(h11/2)2 quasiparticles. In addition, a new multiquasiparticle band based on the πg7/2 ⊗ νg7/2 ⊗ νh11/2 configuration has also been observed. Theoretical interpretations for the assigned configurations are discussed in the framework of Total Routhian Surface (TRS) and Tilted Axis Cranking (TAC) model calculations. TAC model calculations predict a decrease in the B(M1) values with increasing rotational frequency for the πg7/2/πd5/2 ⊗ ν(h11/2)2 and πh11/2 ⊗ ν(h11/2)2 bands, thus indicating a magnetic rotation character for these bands.

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Authors and Affiliations

  1. Department of Physics, Panjab University, 160 014, Chandigarh, India

    R. Kumar, Kuljeet Singh, D. Mehta & Nirmal Singh

  2. Department of Physics, Guru Nanak Dev University, 143 005, Amritsar, India

    S. S. Malik

  3. Oliver Lodge Laboratory, University of Liverpool, L69 7ZE, UK

    E. S. Paul

  4. Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany

    A. Görgen & S. Chmel

  5. Nuclear Science Centre, Aruna Asaf Ali Marg, 110 067, New Delhi, India

    R. P. Singh & S. Muralithar

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Kumar, R., Singh, K., Mehta, D. et al. Collective structures of the 131Cs nucleus. Eur. Phys. J. A 24, 13–22 (2005). https://doi.org/10.1140/epja/i2004-10116-7

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