Swelling of doubly magic $^{48}$Ca core in Ca isotopes beyond $N=28$

Autor: 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.
Rok vydání: 2019
Předmět:
Zdroj: Phys. Rev. Lett. 124, 102501 (2020)
Druh dokumentu: Working Paper
DOI: 10.1103/PhysRevLett.124.102501
Popis: 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
Databáze: arXiv
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