Shell-gap reduced level densities in $^{89,90}$Y
  Particle-$\gamma$ coincidences from the $^{89}$Y($p,p' \gamma$)$^{89}$Y and $^{89}$Y($d,p \gamma$)$^{90}$Y reactions were utilized to obtain $\gamma$-ray spectra as function of excitation energy. The Oslo method was used to extract the level density from the particle-$\gamma$ coincidence matrices. The impact of the $N=50$ shell closure on the level densities is discussed within the framework of a combinatorial quasi-particle model. 
M. Guttormsen, A.C. Larsen, F.L. Bello Garrote, Y. Byun, T.K. Eriksen,   F. Giacoppo, A. G\"orgen, T.W. Hagen, M. Klintefjor...
nucl-ex nucl-th