Compression-mode resonances in the calcium isotopes and implications for the asymmetry term in nuclear incompressibility

K. B. Howard, U. Garg*, M. Itoh, H. Akimune, S. Bagchi, T. Doi, Y. Fujikawa, M. Fujiwara, T. Furuno, M. N. Harakeh, Y. Hijikata, K. Inaba, S. Ishida, N. Kalantar-Nayestanaki, T. Kawabata, S. Kawashima, K. Kitamura, N. Kobayashi, Y. Matsuda, A. NakagawaS. Nakamura, K. Nosaka, S. Okamoto, S. Ota, S. Weyhmiller, Z. Yang

*Corresponding author for this work

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Abstract

Recent data on isoscalar giant monopole resonance (ISGMR) in the calcium isotopes 40,44,48Ca have suggested that Kτ, the asymmetry term in the nuclear incompressibility, has a positive value. A value of Kτ>0 is entirely incompatible with present theoretical frameworks and, if correct, would have far-reaching implications on our understanding of myriad nuclear and astrophysical phenomena. This paper presents results of an independent ISGMR measurement with the 40,42,44,48Ca(α,α) reaction at Eα=386 MeV. These results conclusively discount the possibility of a positive value for Kτ, and are consistent with the previously-obtained values for this quantity.

Original languageEnglish
Article number135185
Number of pages5
JournalPhysics Letters B
Volume801
DOIs
Publication statusPublished - 10-Feb-2020

Keywords

  • Collectivity
  • Giant resonance
  • Nuclear incompressibility
  • Equation of state
  • GIANT-RESONANCES
  • SUM-RULES

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