Physics Letters B (Feb 2020)
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. Nakagawa,
- S. Nakamura,
- K. Nosaka,
- S. Okamoto,
- S. Ota,
- S. Weyhmiller,
- Z. Yang
Affiliations
- K.B. Howard
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA
- U. Garg
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA; Corresponding author.
- M. Itoh
- Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan
- H. Akimune
- Department of Physics, Konan University, Hyogo 658-8501, Japan
- S. Bagchi
- Astronomy and Physics Department, Saint Mary's University, Halifax, NS B3H 3C3, Canada; GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany; Justus-Liebig University, 35392 Giessen, Germany
- T. Doi
- Department of Physics, Kyoto University, Kitashirakawa Oiwake, Sakyo, Kyoto 606-8502, Japan
- Y. Fujikawa
- Department of Physics, Kyoto University, Kitashirakawa Oiwake, Sakyo, Kyoto 606-8502, Japan
- M. Fujiwara
- Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan
- T. Furuno
- Department of Physics, Kyoto University, Kitashirakawa Oiwake, Sakyo, Kyoto 606-8502, Japan; Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan
- M.N. Harakeh
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany; KVI-CART, University of Groningen, 9747 AA Groningen, the Netherlands
- Y. Hijikata
- Department of Physics, Kyoto University, Kitashirakawa Oiwake, Sakyo, Kyoto 606-8502, Japan
- K. Inaba
- Department of Physics, Kyoto University, Kitashirakawa Oiwake, Sakyo, Kyoto 606-8502, Japan
- S. Ishida
- Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan
- N. Kalantar-Nayestanaki
- KVI-CART, University of Groningen, 9747 AA Groningen, the Netherlands
- T. Kawabata
- Department of Physics, Osaka University, Toyonaka, Osaka 540-0043, Japan
- S. Kawashima
- Department of Physics, Konan University, Hyogo 658-8501, Japan
- K. Kitamura
- Department of Physics, Konan University, Hyogo 658-8501, Japan
- N. Kobayashi
- Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan
- Y. Matsuda
- Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan
- A. Nakagawa
- Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan
- S. Nakamura
- Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan
- K. Nosaka
- Department of Physics, Konan University, Hyogo 658-8501, Japan; Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan
- S. Okamoto
- Department of Physics, Kyoto University, Kitashirakawa Oiwake, Sakyo, Kyoto 606-8502, Japan
- S. Ota
- Center for Nuclear Study, The University of Tokyo, Wako, Saitama 351-0198, Japan
- S. Weyhmiller
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA
- Z. Yang
- Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan
- Journal volume & issue
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Vol. 801
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. Keywords: Collectivity, Giant resonance, Nuclear incompressibility, Equation of state
