Sub-barrier fusion in the Cl37+Te130 system

Rudra N. Sahoo, Malika Kaushik, Arshiya Sood, Pawan Kumar, Arzoo Sharma, Swati Thakur, Pushpendra P. Singh, P. K. Raina, Md. Moin Shaikh, Rohan Biswas, Abhishek Yadav, J. Gehlot, S. Nath, N. Madhavan, V. Srivastava, Manoj K. Sharma, B. P. Singh, R. Prasad, Anjali Rani, A. Banerjee, Unnati Gupta, Nabendu K. Deb, and B. J. Roy
Phys. Rev. C 99, 024607 – Published 5 February 2019

Abstract

Background: In heavy-ion induced reactions, the sub-barrier fusion cross sections are found to be higher as compared to the predictions of the one-dimensional barrier penetration model. Attempts have been made to explain sub-barrier fusion enhancement by including the static deformations, the couplings to inelastic excitations, and non-fusion channels.

Purpose: To investigate factors which influence the sub-barrier fusion in the Cl37+Te130 system and to understand the interplay of couplings, the fusion excitation function was measured at energies from 10% below to 15% above the Bass barrier.

Method: The fusion excitation function was measured by employing a recoil mass spectrometer, the Heavy-Ion Reaction Analyser (HIRA), at the Inter-University Accelerator Centre, New Delhi. To study the behavior of the fusion excitation function and the effect of couplings at sub-barrier energies, the excitation function was analyzed in the framework of the coupled-channels code ccfull.

Results: In the present work, the fusion cross section was measured down to 1 μb at the lowest measured energy, i.e., 10% below the barrier. It was found that the inclusion of couplings of low-lying excited states along with the modified barrier between interacting nuclei satisfactorily reproduces the fusion excitation function of the Cl37+Te130 system. For better insight into the sub-barrier fusion, the fusion barrier distribution, the logarithmic derivative L(E) factor, and the astrophysical S factor were extracted from the analysis of the experimentally measured fusion excitation function.

Conclusions: The analysis of the fusion excitation function in terms of the astrophysical S factor and the L(E) factor suggests the absence of fusion hindrance in the Cl37+Te130 system down to a 1 μb cross section achieved at the lowest measured energy. The excitation function of the present system is compared with the existing measurements in which Cl37 has been used as a projectile to understand the interplay of entrance-channel parameters in sub-barrier fusion enhancement.

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  • Received 17 October 2018

DOI:https://doi.org/10.1103/PhysRevC.99.024607

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Rudra N. Sahoo1,*, Malika Kaushik1, Arshiya Sood1, Pawan Kumar1, Arzoo Sharma1, Swati Thakur1, Pushpendra P. Singh1,†, P. K. Raina1, Md. Moin Shaikh2, Rohan Biswas3, Abhishek Yadav3, J. Gehlot3, S. Nath3, N. Madhavan3, V. Srivastava4, Manoj K. Sharma5, B. P. Singh6, R. Prasad6, Anjali Rani7, A. Banerjee7, Unnati Gupta7, Nabendu K. Deb8, and B. J. Roy9

  • 1Department of Physics, Indian Institute of Technology Ropar, Rupnagar 140 001, Punjab, India
  • 2Variable Energy Cyclotron Centre, 1/AF, Bidhannagar, Kolkata 700 064, India
  • 3Nuclear Physics Group, Inter-University Accelerator Centre, New Delhi 110 067, India
  • 4Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700 064, India
  • 5Department of Physics, S. V. College, Aligarh 202 001, Uttar Pradesh, India
  • 6Department of Physics, Aligarh Muslim University, Aligarh 202 001, Uttar Pradesh, India
  • 7Department of Physics and Astrophysics, Delhi University, Delhi 110 007, India
  • 8Department of Physics, Gauhati University, Guwahati 781 014, Assam, India
  • 9Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India

  • *rnsahoo@iitrpr.ac.in
  • pps@iitrpr.ac.in

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Vol. 99, Iss. 2 — February 2019

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