Evidence for the pair-breaking process in 116,117Sn

Abstract

The nuclear level densities of 116,117Sn below the neutron separation energy have been determined experimentally from the (3He,alpha gamma) and (3He,3He gamma') reactions, respectively. The level densities show a characteristic exponential increase and a difference in magnitude due to the odd-even effect of the nuclear systems. In addition, the level densities display pronounced step-like structures that are interpreted as signatures of subsequent breaking of nucleon pairs.

7 pages, 5 figures, accepted for publication in Phys. Rev. C, 22 December 2008

References in corpus (7)

• Extraction of level density and gamma strength function from primary gamma spectra
• Odd-even staggering of binding energies as a consequence of pairing and mean-field effects
• Level densities and $\gamma$-ray strength functions in ${}^{170,171,172}$Yb
• Entropy of thermal quasiparticles in nuclei
• Free energy and criticality in the nucleon pair breaking process
• Evolution of level density step structures from 56,57-Fe to 96,97-Mo
• Level density and gamma strength function in 162-Dy from inelastic 3-He scattering

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