Well Developed Deformation in Si-42

作者：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; Gernhaeuser R; Gibelin J; Go S; Grevy S; Hinke C; Hoffman C R; Hughes R; Ideguchi E; Jenkins D; Kobayashi N; Kondo Y; Kruecken 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

来源：Physical Review Letters, 2012, 109(18): 182501.

DOI：10.1103/PhysRevLett.109.182501

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(+) -%26gt; 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.

• 出版日期2012-11-2
• 单位北京大学; 中国地震局