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

Guttormsen M., Alhassid Y., Ryssens W., AY K., ÖZGÜR M., Algin E., ...Daha Fazla

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, cilt.816, 2021 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 816
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1016/j.physletb.2021.136206
  • Dergi Adı: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, INSPEC, zbMATH, Directory of Open Access Journals
  • Anahtar Kelimeler: Nuclear level density, Oslo method, Shell model Monte Carlo, Mean-field theory, Collective enhancement, NUCLEAR, MODEL
  • Eskişehir Osmangazi Üniversitesi Adresli: Evet

Özet

© 2021 The Author(s)Understanding the evolution of level densities in the crossover from spherical to well-deformed nuclei has been a long-standing problem in nuclear physics. We measure nuclear level densities for a chain of neodymium isotopes 142,144−151Nd which exhibit such a crossover. These results represent the most complete data set of nuclear level densities to date for an isotopic chain between neutron shell-closure and towards mid-shell. We observe a strong increase of the level densities along the chain with an overall increase by a factor of ≈150 at an excitation energy of 6 MeV and saturation around mass 150. Level densities calculated by the shell model Monte Carlo (SMMC) are in excellent agreement with these experimental results. Based on our experimental and theoretical findings, we offer an explanation of the observed mass dependence of the level densities in terms of the intrinsic single-particle level density and the collective enhancement.