학술논문
Swelling of doubly magic $^{48}$Ca core in Ca isotopes beyond $N=28$
Document Type
Working Paper
Author
Tanaka, M.; Takechi, M.; Homma, A.; Fukuda, M.; Nishimura, D.; Suzuki, T.; Tanaka, Y.; Moriguchi, T.; Ahn, D. S.; Aimaganbetov, A.; Amano, M.; Arakawa, H.; Bagchi, S.; Behr, K. -H.; Burtebayev, N.; Chikaato, K.; Du, H.; Ebata, S.; Fujii, T.; Fukuda, N.; Geissel, H.; Hori, T.; Horiuchi, W.; Hoshino, S.; Igosawa, R.; Ikeda, A.; Inabe, N.; Inomata, K.; Itahashi, K.; Izumikawa, T.; Kamioka, D.; Kanda, N.; Kato, I.; Kenzhina, I.; Korkulu, Z.; Kuk, Y.; Kusaka, K.; Matsuta, K.; Mihara, M.; Miyata, E.; Nagae, D.; Nakamura, S.; Nassurlla, M.; Nishimuro, K.; Nishizuka, K.; Ohnishi, K.; Ohtake, M.; Ohtsubo, T.; Omika, S.; Ong, H. J.; Ozawa, A.; Prochazka, A.; Sakurai, H.; Scheidenberger, C.; Shimizu, Y.; Sugihara, T.; Sumikama, T.; Suzuki, H.; Suzuki, S.; Takeda, H.; Tanaka, Y. K.; Tanihata, I.; Wada, T.; Wakayama, K.; Yagi, S.; Yamaguchi, T.; Yanagihara, R.; Yanagisawa, Y.; Yoshida, K.; Zholdybayev, T. K.
Source
Phys. Rev. Lett. 124, 102501 (2020)
Subject
Language
Abstract
Interaction cross sections for $^{42\textrm{-}51}$Ca on a carbon target at 280 MeV/nucleon have been measured for the first time. The neutron number dependence of derived root-mean-square matter radii shows a significant increase beyond the neutron magic number $N=28$. Furthermore, this enhancement of matter radii is much larger than that of the previously measured charge radii, indicating a novel growth in neutron skin thickness. A simple examination based on the Fermi-type distribution, and the Mean-Field calculations point out that this anomalous enhancement of the nuclear size beyond $N=28$ results from an enlargement of the core by a sudden increase in the surface diffuseness of the neutron density distribution, which implies the swelling of the bare $^{48}$Ca core in Ca isotopes beyond $N=28$.
Comment: 6 pages, 3 figures
Comment: 6 pages, 3 figures