Evidence of halo structure in Mg 37 observed via reaction cross sections and intruder orbitals beyond the island of inversion

M. Takechi, S. Suzuki, D. Nishimura, M. Fukuda, T. Ohtsubo, M. Nagashima, T. Suzuki, T. Yamaguchi, A. Ozawa, T. Moriguchi, H. Ohishi, T. Sumikama, H. Geissel, N. Aoi, Rui Jiu Chen, De Qing Fang, N. Fukuda, S. Fukuoka, H. Furuki, N. InabeY. Ishibashi, T. Itoh, T. Izumikawa, D. Kameda, T. Kubo, M. Lantz, C. S. Lee, Yu Gang Ma, K. Matsuta, M. Mihara, S. Momota, D. Nagae, R. Nishikiori, T. Niwa, T. Ohnishi, K. Okumura, M. Ohtake, T. Ogura, H. Sakurai, K. Sato, Y. Shimbara, H. Suzuki, H. Takeda, S. Takeuchi, K. Tanaka, M. Tanaka, H. Uenishi, M. Winkler, Y. Yanagisawa, S. Watanabe, K. Minomo, S. Tagami, M. Shimada, M. Kimura, T. Matsumoto, Y. R. Shimizu, M. Yahiro

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Abstract

Precise reaction cross sections (σR) for Mg24-38 on C targets at energies around 240 MeV/nucleon have been measured at the Radioactive Isotope Beam Factory at RIKEN. The σR for Mg36-38 have been measured for the first time. An enhancement of σR compared to the systematics for spherical stable nuclei has been observed, especially in the neutron-rich region, which reflects the deformation of those isotopes. In the vicinity of the drip line the σR for Mg37 is especially large. It is shown by analysis using a recently developed theoretical method that this prominent enhancement of σR for Mg37 should come from the p-orbital halo formation breaking the N=28 shell gap.

Original languageEnglish
Article number061305
JournalPhysical Review C - Nuclear Physics
Volume90
Issue number6
DOIs
Publication statusPublished - Dec 29 2014

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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