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In-beam γ-ray spectroscopy of ^34,36,38Mg: merging the N=20 and N=28 shell quenching.

  • Author(s): Doornenbal, P
  • Scheit, H
  • Takeuchi, S
  • Aoi, N
  • Li, K
  • Matsushita, M
  • Steppenbeck, D
  • Wang, H
  • Baba, H
  • Crawford, H
  • Hoffman, CR
  • Hughes, R
  • Ideguchi, E
  • Kobayashi, N
  • Kondo, Y
  • Lee, J
  • Michimasa, S
  • Motobayashi, T
  • Sakurai, H
  • Takechi, M
  • Togano, Y
  • Winkler, R
  • Yoneda, K
  • et al.
Abstract

Neutron-rich N=22, 24, 26 magnesium isotopes were studied via in-beam γ-ray spectroscopy at the RIKEN Radioactive Isotope Beam Factory following secondary fragmentation reactions on a carbon target at ≈200 MeV/nucleon. In the one- and two-proton removal channels from 39Al and 40Si beams, two distinct γ-ray transitions were observed in 38Mg, while in the one-proton removal reaction from 37Al a new transition was observed in addition to the known 2(1)(+)→0(g.s.)(+) decay. From the experimental systematics and comparison to theoretical predictions it is concluded that the transitions belong to the 2(1)(+)→0(g.s.)(+) and 4(1)(+)→2(1)(+) decays in 36Mg and 38Mg, respectively. For 34Mg, previously reported 2(1)(+) and 4(1)(+) level energies were remeasured. The deduced E(4(1)(+))/E(2(1)(+)) ratios for 34,36,38Mg of 3.14(5), 3.07(5), and 3.07(5) are almost identical and suggest the emergence of a large area of deformation extending from the N=20 to the N=28 shell quenching.

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