Giant dipole resonance studies in Ba isotopes at E/A5 MeV

C. Ghosh, A. K. Rhine Kumar, Balaram Dey, V. Nanal, R. G. Pillay, P. Arumugam, K. V. Anoop, N. Dokania, Abhijit Garai, Ghnashyam Gupta, E. T. Mirgule, G. Mishra, Debasish Mondal, S. Pal, M. S. Pose, and P. C. Rout
Phys. Rev. C 96, 014309 – Published 13 July 2017

Abstract

Exclusive measurements of high-energy γ rays have been performed in Ba124 and Ba136 at the same excitation energy (49MeV) to study the properties of the giant dipole resonance (GDR) over a wide N/Z range. The high-energy γ rays are measured in coincidence with the multiplicity of low-energy γ rays to disentangle the effect of temperature (T) and angular momentum (J). The GDR parameters are extracted employing a simulated Monte Carlo statistical model analysis. The observed γ-ray spectra of Ba124 can be explained with prolate deformation, whereas a single-component Lorentzian function which corresponds to a spherical shape could explain the γ-ray spectra of Ba136. The observed GDR width in Ba136 is narrower compared to that of Ba124. The statistical model best-fit GDR cross sections are found to be in reasonable agreement with the thermal shape fluctuation model (TSFM) calculations. Further, it is shown that the variation of GDR width with T is well reproduced by the TSFM calculations over the temperature range of 1.1–1.7 MeV.

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  • Received 15 April 2017

DOI:https://doi.org/10.1103/PhysRevC.96.014309

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

C. Ghosh1, A. K. Rhine Kumar1,*, Balaram Dey1, V. Nanal1,†, R. G. Pillay1, P. Arumugam2, K. V. Anoop3, N. Dokania1, Abhijit Garai4, Ghnashyam Gupta1, E. T. Mirgule5, G. Mishra5, Debasish Mondal6,7, S. Pal3, M. S. Pose1, and P. C. Rout5

  • 1Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai 400005, India
  • 2Department of Physics, Indian Institute of Technology, Roorkee 247667, India
  • 3Pelletron Linac Facility, Tata Institute of Fundamental Research, Mumbai 400005, India
  • 4India-based Neutrino Observatory, Tata Institute of Fundamental Research, Mumbai 400005, India
  • 5Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
  • 6Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Kolkata 700064, India
  • 7Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India

  • *Present address: Department of Physics, National Institute of Technology Karnataka, Surathkal - 575025, India.
  • nanal@tifr.res.in

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Vol. 96, Iss. 1 — July 2017

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