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Well developed deformation in 42Si.

  • Author(s): Takeuchi, S
  • Matsushita, M
  • Aoi, N
  • Doornenbal, P
  • Li, K
  • Motobayashi, T
  • Scheit, H
  • Steppenbeck, D
  • Wang, H
  • Baba, H
  • Bazin, D
  • Càceres, L
  • Crawford, H
  • Fallon, P
  • Gernhäuser, R
  • Gibelin, J
  • Go, S
  • Grévy, S
  • Hinke, C
  • Hoffman, CR
  • Hughes, R
  • Ideguchi, E
  • Jenkins, D
  • Kobayashi, N
  • Kondo, Y
  • Krücken, R
  • Le Bleis, T
  • Lee, J
  • Lee, G
  • Matta, A
  • Michimasa, S
  • Nakamura, T
  • Ota, S
  • Petri, M
  • Sako, T
  • Sakurai, H
  • Shimoura, S
  • Steiger, K
  • Takahashi, K
  • Takechi, M
  • Togano, Y
  • Winkler, R
  • Yoneda, K
  • et al.
Abstract

Excited states in (38,40,42) Si nuclei have been studied via in-beam γ-ray spectroscopy with multinucleon removal reactions. Intense radioactive beams of ^{40}S and (44)S provided at the new facility of the RIKEN Radioactive Isotope Beam Factory enabled γ-γ coincidence measurements. A prominent γ line observed with an energy of 742(8) keV in (42) Si confirms the 2(+) state reported in an earlier study. Among the γ lines observed in coincidence with the 2^{+} → 0+ transition, the most probable candidate for the transition from the yrast 4(+) state was identified, leading to a 4(1)+) energy of 2173(14) keV. The energy ratio of 2.93(5) between the 2(1)+ and 4(1)(+) states indicates well-developed deformation in (42) Si at N = 28 and Z = 14. Also for 38,40)Si energy ratios with values of 2.09(5) and 2.56(5) were obtained. Together with the ratio for (42)Si, the results show a rapid deformation development of Si isotopes from N = 24 to N = 28.

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