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

Abstract

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.

arXiv comment5 pages, 5 figures

References in corpus (3)

• Observation of Thermodynamical Properties in the ${}^{162}$Dy, ${}^{166}$Er and ${}^{172}$Yb Nuclei
• Statistical structure and $\gamma$-decay properties of closed shell Pb nuclei
• A large area plastic scintillator detector array for fast neutron measurements

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• Fusion of ${}^7$Li with ${}^{205}$Tl at near barrier energies
• Experimental Evidence of Large Collective Enhancement of Nuclear Level Density and its Significance in Radiative Neutron Capture
• Fission barriers heights in A$\sim$ 200 mass region
• Systematic shell-model study of structure and isomeric states in ${}^{204-213}$Bi isotopes
• Dependence of spin induced structural transitions on level density and Neutron emission spectra
• Impact of the quenching of shell effects with excitation energy on Nuclear Level Density
• Impact of microscopic structural transitions on particle stability and lifetimes of hot nuclei