1210.3213 (P. C. Rout et al.)

Measurement of the damping of nuclear shell effect in the doubly magic
$^{208}$Pb region    [PDF]

P. C. Rout, D. R. Chakrabarty, V. M. Datar, Suresh Kumar, E. T Mirgule, A. Mitra, V. Nanal, S. P. Behera, V. Singh

The damping of the nuclear shell effect with excitation energy has been measured through an analysis of the neutron spectra following the triton transfer in the $^7$Li induced reaction on $^{205}$Tl. The measured neutron spectra demonstrate the expected large shell correction energy for the nuclei in the vicinity of doubly magic $^{208}$Pb and a small value for $^{184}$W. A quantitative extraction of the allowed values of the damping parameter $\gamma$, along with those for the asymptotic nuclear level density parameter $\tilde{a}$, has been made for the first time.

View original: http://arxiv.org/abs/1210.3213