First Determination of the Level Structure of an sd-Shell Hypernucleus, FΛ19

S. B. Yang et al. (J-PARC E13 Collaboration)
Phys. Rev. Lett. 120, 132505 – Published 29 March 2018

Abstract

We report on the first observation of γ rays emitted from an sd-shell hypernucleus, FΛ19. The energy spacing between the ground state doublet, 1/2+ and 3/2+ states, of FΛ19 is determined to be 315.5±0.4(stat)0.5+0.6(syst)keV by measuring the γ-ray energy of the M1(3/2+1/2+) transition. In addition, three γ-ray peaks are observed and assigned as E2(5/2+1/2+), E1(1/21/2+), and E1(1/23/2+) transitions. The excitation energies of the 5/2+ and 1/2 states are determined to be 895.2±0.3(stat)±0.5(syst) and 1265.6±1.2(stat)0.5+0.7(syst)keV, respectively. It is found that the ground state doublet spacing is well described by theoretical models based on existing s- and p-shell hypernuclear data.

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  • Received 20 December 2017
  • Revised 15 February 2018

DOI:https://doi.org/10.1103/PhysRevLett.120.132505

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 120, Iss. 13 — 30 March 2018

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