Neutron single-particle states above theN=164subshell in98251Cfand96249Cmstudied by neutron transfer reactions

Abstract

Single-particle state assignments in $^{251}\mathrm{Cf}$ and $^{249}\mathrm{Cm}$ at $~1$ MeV excitation have been deduced from cross sections previously measured for the $^{250}\mathrm{Cf}(d,p)^{251}\mathrm{Cf}$ and $^{248}\mathrm{Cm}(^{4}\mathrm{He},^{3}\mathrm{He})^{249}\mathrm{Cm}$ reactions. The assignments are supported by observed cross-section signatures and intraband level spacings. The observed energies of these single-particle states, after pairing effects are removed, are in good agreement with values calculated using a Woods-Saxon single-particle potential. Neutron level diagrams, showing level spacings as a function of ${\ensuremath{\nu}}_{2},{\ensuremath{\nu}}_{4},$ and ${\ensuremath{\nu}}_{6}$, are extended to include neutron orbitals above $N=164$.