Quadrupole collectivity in island-of-inversion nuclei 28,30Ne and 34,36Mg

S. Michimasa, Y. Yanagisawa, K. Inafuku, N. Aoi, Z. Elekes, Zs Fülöp, Y. Ichikawa, N. Iwasa, K. Kurita, M. Kurokawa, T. Machida, T. Motobayashi, T. Nakamura, T. Nakabayashi, M. Notani, H. J. Ong, T. K. Onishi, H. Otsu, H. Sakurai, M. ShinoharaT. Sumikama, S. Takeuchi, K. Tanaka, Y. Togano, K. Yamada, M. Yamaguchi, K. Yoneda

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Abstract

The quadrupole collectivity of neutron-rich even-even neon and magnesium nuclei around N=20, 28,30Ne, and 32,34,36Mg, was studied via proton inelastic scattering on a liquid hydrogen target by in-beam γ-ray spectroscopy in inverse kinematics. The angle-integrated cross sections for the first 2+ states of these nuclei were determined by measuring de-excitation γ rays. The deformation lengths were extracted from the angle-integrated cross sections using distorted-wave calculations. The deformation length of 30Ne (δ(p,p′)=1.59-0.09+0.08 fm) is smaller than that of 32Mg (1.83-0.11+0.10 fm), which exhibits the largest quadrupole collectivity among the neutron-rich N=20 isotones. Along the magnesium isotopic chain, the deformation lengths of 34Mg and 36Mg were deduced to be 2.30-0.10+0.09 fm and 1.90-0.17+0.16 fm, respectively. The evolution of quadrupole deformation in the vicinity of 32Mg is discussed by comparing the present results with the theoretical calculations.

Original languageEnglish
Article number054307
JournalPhysical Review C - Nuclear Physics
Volume89
Issue number5
DOIs
Publication statusPublished - May 7 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    Michimasa, S., Yanagisawa, Y., Inafuku, K., Aoi, N., Elekes, Z., Fülöp, Z., Ichikawa, Y., Iwasa, N., Kurita, K., Kurokawa, M., Machida, T., Motobayashi, T., Nakamura, T., Nakabayashi, T., Notani, M., Ong, H. J., Onishi, T. K., Otsu, H., Sakurai, H., ... Yoneda, K. (2014). Quadrupole collectivity in island-of-inversion nuclei 28,30Ne and 34,36Mg. Physical Review C - Nuclear Physics, 89(5), [054307]. https://doi.org/10.1103/PhysRevC.89.054307