Collective Enhancement of Nuclear Level Density and its fade-out in ¹⁶¹Dy

2023/10/20 by T. Santhosh, Santhosh, T., P. C. Rout +11
Physics and Astronomy · #Nuclear physics research studies #Scientific Research and Discoveries #Atomic and Molecular Physics

paper · pdf · doi:10.48550/arxiv.2310.13280

Abstract

The nuclear level density is a fundamental quantity in nuclear physics, governing various nuclear reactions and astrophysical processes. In this study, we report on the collective enhancement of nuclear level density and its fade-out with excitation energy in the deformed ¹⁶¹Dy, obtained through an exclusive measurement of neutron evaporation spectra. The ¹⁶²Dy nucleus was populated via the transfer of a triton in a ⁷Li-induced reaction on ¹⁵⁹Tb. Statistical model analysis of the neutron spectra revealed a large collective enhancement factor of 42±2, consistent with microscopic calculations. This enhancement factor is similar to the one obtained for mass A∼170 in our previous measurement. The energy-dependent collective enhancement over a wide range of excitation energies was inferred by combining the present results with the available Oslo level density below the neutron binding energy.

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