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Well-developed deformation in 42Si

Abstract : Excited states in 38,40,42Si nuclei have been studied via in-beam gamma-ray spectroscopy with multi-nucleon removal reactions. Intense radioactive beams of 40S and 44S 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 42Si 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 42Si at N=28 and Z=14. Also for 38,40Si energy ratios with values of 2.09(5) and 2.56(5) were obtained. Together with the ratio for 42Si, the results show a rapid deformation development of Si isotopes from N=24 to N=28.
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Submitted on : Friday, July 27, 2012 - 8:59:48 AM
Last modification on : Wednesday, September 16, 2020 - 4:07:55 PM

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S. Takeuchi, M. Matsushita, N. Aoi, P. Doornenbal, K. Li, et al.. Well-developed deformation in 42Si. Physical Review Letters, American Physical Society, 2012, 109, pp.182501. ⟨10.1103/PhysRevLett.109.182501⟩. ⟨in2p3-00721241⟩

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