Crossing of large multiquasiparticle magnetic-rotation bands in Bi198

H. Pai, G. Mukherjee, S. Bhattacharyya, C. Bhattacharya, S. Bhattacharya, T. Bhattacharjee, S. K. Basu, S. Kundu, T. K. Ghosh, K. Banerjee, T. K. Rana, J. K. Meena, R. K. Bhowmik, R. P. Singh, S. Muralithar, S. Chanda, R. Garg, B. Maheshwari, D. Choudhury, and A. K. Jain
Phys. Rev. C 90, 064314 – Published 19 December 2014

Abstract

High-spin states in the doubly-odd Bi198 nucleus have been studied by using the Re185,187(O16,xn) reactions at a beam energy of 112.5 MeV. γγ coincidences, directional correlation ratio, and integrated polarization asymmetry ratio were measured by using the INGA array with 15 Compton-suppressed clover high-purity germanium (HPGe) detectors. Definite spins and parities were assigned to the observed levels. The high-spin structure is grouped into three bands (B1, B2, and B3), of which two (B1 and B2) exhibit the properties of magnetic rotation (MR). Tilted axis cranking calculations were carried out to explain the MR bands having large multiquasiparticle (qp) configurations. The calculated results explain the bands B1 and B2 very nicely, confirming the shears mechanism and suggest a crossing of two MR bands in both the cases. The crossing is from 6-qp to 8-qp in band B1 and from 4-qp to 6-qp in band B2, a very rare finding. A semiclassical model has also been used to obtain the particle-hole interaction strengths below the band crossing for the bands B1 and B2.

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  • Received 20 June 2014
  • Revised 22 November 2014

DOI:https://doi.org/10.1103/PhysRevC.90.064314

©2014 American Physical Society

Authors & Affiliations

H. Pai*, G. Mukherjee, S. Bhattacharyya, C. Bhattacharya, S. Bhattacharya, T. Bhattacharjee, S. K. Basu, S. Kundu, T. K. Ghosh, K. Banerjee, T. K. Rana, and J. K. Meena

  • Variable Energy Cyclotron Centre, Kolkata 700064, India

R. K. Bhowmik, R. P. Singh, and S. Muralithar

  • Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India

S. Chanda

  • Fakir Chand College, Diamond Harbour, West Bengal 743331, India

R. Garg

  • Department of Physics and Astrophysics, University of Delhi, New Delhi 110007, India

B. Maheshwari, D. Choudhury, and A. K. Jain

  • Department of Physics, Indian Institute of Technology, Roorkee 247667, India

  • *Present address: Institut für Kernphysik, Technische Universität Darmstadt, Germany; hari.vecc@gmail.com, hpai@ikp.tu-darmstadt.de, H.Pai@gsi.de.
  • Corresponding author: gopal@vecc.gov.in
  • Present address: Tata Institute of Fundamental Research, Mumbai, India.

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Issue

Vol. 90, Iss. 6 — December 2014

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