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

K. B. Howard, U. Garg, M. Itoh, H. Akimune, M. Fujiwara, T. Furuno, Y. K. Gupta, M. N. Harakeh, K. Inaba, Y. Ishibashi, K. Karasudani, T. Kawabata, A. Kohda, Y. Matsuda, M. Murata, S. Nakamura, J. Okamoto, S. Ota, J. Piekarewicz, A. SakaueM. Şenyiğit, M. Tsumura, Y. Yang

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


“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, 90Zr and 208Pb, 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 90Zr and the cadmium and tin isotopes. The experiment was conducted using the 94,96,98,100Mo(α,α) reaction at Eα=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.

Original languageEnglish
Article number135608
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 2020 Aug 10


  • Collectivity
  • Equation of state
  • Giant resonance
  • Nuclear incompressibility
  • Softness

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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