Compressional-mode resonances in the molybdenum isotopes: Emergence of softness in open-shell nuclei near A=90

Howard K. B., Garg U., Itoh M., Akimune H., Fujiwara M., Furuno T., ...Daha Fazla

PHYSICS LETTERS B, cilt.807, 2020 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 807
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.physletb.2020.135608
  • Dergi Adı: PHYSICS LETTERS B
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, INSPEC, zbMATH, Directory of Open Access Journals
  • Anahtar Kelimeler: Collectivity, Giant resonance, Nuclear incompressibility, Softness, Equation of state, GIANT MONOPOLE RESONANCE, INCOMPRESSIBILITY, DEFORMATION, STRENGTH, ENERGY
  • Ankara Üniversitesi Adresli: Evet

Özet

"Why are the tin isotopes soft?" has remained, for the past decade, an open problem in nuclear structure physics: models which reproduce the isoscalar giant monopole resonance (ISGMR) in the "doubly-closed shell" nuclei, Zr-90 and Pb-208, overestimate the ISGMR energies of the open-shell tin and cadmium nuclei, by as much as 1 MeV. In an effort to shed some light onto this problem, we present results of detailed studies of the ISGMR in the molybdenum nuclei, with the goal of elucidating where-and how-the softness manifests itself between Zr-90 and the cadmium and tin isotopes. The experiment was conducted using the Mo-94,Mo-96,Mo-98,Mo-100(alpha, alpha') reaction at E-alpha = 386 MeV. A comparison of the results with relativistic, self-consistent Random-Phase Approximation calculations indicates that the ISGMR response begins to show softness in the molybdenum isotopes beginning with A = 92. (C) 2020 Published by Elsevier B.V.