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Understanding the evolution of level densities in the crossover fromspherical to well-deformed nuclei has been a long-standing problem in nuclearphysics. We measure nuclear level densities for a chain of neodymium isotopes$^{142,144-151}$Nd which exhibit such a crossover. These results represent todate the most complete data set of nuclear level densities for an isotopicchain between neutron shell-closure and towards mid-shell. We observe a strongincrease of the level densities along the chain with an overall increase by afactor of $\approx 170$ at an excitation energy of 7.5 MeV and saturationaround mass 150. Level densities calculated by the shell model Monte Carlo(SMMC) are in excellent agreement with these experimental results. Based on ourexperimental and theoretical findings, we offer an explanation of the observedmass dependence of the level densities in terms of the intrinsicsingle-particle level density and the collective enhancement.

Strong enhancement of level densities in the crossover from spherical to deformed neodymium isotopes