Well Developed Deformation in Si42

S. Takeuchi et al.
Phys. Rev. Lett. 109, 182501 – Published 2 November 2012

Abstract

Excited states in Si38,40,42 nuclei have been studied via in-beam γ-ray spectroscopy with multinucleon removal reactions. Intense radioactive beams of S40 and S44 provided at the new facility of the RIKEN Radioactive Isotope Beam Factory enabled γγ coincidence measurements. A prominent γ line observed with an energy of 742(8) keV in Si42 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 41+ energy of 2173(14) keV. The energy ratio of 2.93(5) between the 21+ and 41+ states indicates well-developed deformation in Si42 at N=28 and Z=14. Also for Si38,40 energy ratios with values of 2.09(5) and 2.56(5) were obtained. Together with the ratio for Si42, the results show a rapid deformation development of Si isotopes from N=24 to N=28.

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  • Received 26 July 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.182501

© 2012 American Physical Society

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Vol. 109, Iss. 18 — 2 November 2012

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