EPJ Web of Conferences 17, 16014 (2011)
https://doi.org/10.1051/epjconf/20111716014

Study of the effect of shell closure on the nuclear dissipation

¹ Department of Physics, Panjab University, Chandigarh - 160014, India
² Department of Physics and Astrophysics, Delhi University, Delhi - 110007, India
³ Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi - 110067, India
⁴ Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai - 499985, India

^* e-mail: bivash@pu.ac.in

Abstract

Neutron multiplicity measurements are carried out for the ¹⁹F + ^194,196,198Pt systems at excitation energy range of 48 to 67.5 MeV. Out of these three compound nuclei (CN) ²¹⁷Fr, ²¹⁵Fr and ²¹³Fr, one of the CN (²¹³Fr) has neutron shell closure (N_C=126). Experimentally obtained neutron multiplicities are compared with the standard statistical model predictions. It has been observed that the standard statistical model under-predicts the experimental pre-scission neutron multiplicities values. Also the comparison of pre-scission neutron multiplicities for different compound nuclei (CN) indicates the signature of shell effects on nuclear dissipation, which results in the lowering of the pre-scission neutron multiplicities.