Well Developed Deformation in Si-42

Publication Type
Journal Article
Year of Publication
Takeuchi, S.
Matsushita, M.
Aoi, N.
Doornenbal, P.
Li, K.
Motobayashi, T.
Scheit, H.
Steppenbeck, D.
Wang, H.
Baba, H.
Bazin, D.
Caceres, L.
Crawford, H.
Fallon, P.
Gernhauser, R.
Gibelin, J.
Go, S.
Grevy, S.
Hinke, C.
Hoffman, C. R.
Ideguchi, E.
Jenkins, D.
Kobayashi, N.
Kondo, Y.
Krucken, 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.
Name of Publication
Physical Review Letters
Date Published
Short Title
Well Developed Deformation in Si-42
Accession Number
ISBN Number

Excited states in Si-38,Si-40,Si-42 nuclei have been studied via in-beam gamma-ray spectroscopy with multinucleon removal reactions. Intense radioactive beams of S-40 and S-44 provided at the new facility of the RIKEN Radioactive Isotope Beam Factory enabled gamma-gamma coincidence measurements. A prominent gamma line observed with an energy of 742(8) keV in Si-42 confirms the 2(+) state reported in an earlier study. Among the gamma 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 Si-42 at N = 28 and Z = 14. Also for Si-38,Si-40 energy ratios with values of 2.09(5) and 2.56(5) were obtained. Together with the ratio for Si-42, the results show a rapid deformation development of Si isotopes from N = 24 to N = 28.