First Determination of the Level Structure of an sd-Shell Hypernucleus, _{Λ}
Phys Rev Lett
; 120(13): 132505, 2018 Mar 30.
Article
em En
| MEDLINE
| ID: mdl-29694189
ABSTRACT
We report on the first observation of γ rays emitted from an sd-shell hypernucleus, _{Λ}^{19}F. The energy spacing between the ground state doublet, 1/2^{+} and 3/2^{+} states, of _{Λ}^{19}F 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^{+}â1/2^{+}) transition. In addition, three γ-ray peaks are observed and assigned as E2(5/2^{+}â1/2^{+}), E1(1/2^{-}â1/2^{+}), and E1(1/2^{-}â3/2^{+}) 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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MEDLINE
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2018
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Article