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

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...

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Published in:Physics letters. B Vol. 801; p. 135185
Main Authors: Howard, K.B., Garg, U., Itoh, M., Akimune, H., Bagchi, S., Doi, T., Fujikawa, Y., Fujiwara, M., Furuno, T., Harakeh, M.N., Hijikata, Y., Inaba, K., Ishida, S., Kalantar-Nayestanaki, N., Kawabata, T., Kawashima, S., Kitamura, K., Kobayashi, N., Matsuda, Y., Nakagawa, A., Nakamura, S., Nosaka, K., Okamoto, S., Ota, S., Weyhmiller, S., Yang, Z.
Format: Journal Article
Language:English
Published: Elsevier B.V 10.02.2020
Elsevier
Subjects:
Collectivity
Equation of state
Giant resonance
Nuclear incompressibility
Collectivity
Giant resonance
Nuclear incompressibility
Equation of state
ISSN:0370-2693, 1873-2445
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Summary: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.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2019.135185