Observation of hypernuclear fine structure in 16ΛO

M Ukai ,J Franz,T Hayakawa,K Tanida,K Imai,A Banu,H Akikawa,H Hotchi,P Pile,K Mizunuma,S Ajimura,Y Okayasu,H Tamura ,S Minami ,Kimitaka Nakazawa ,Reto Sutter ,G Franklin ,D.e Alburger ,Y Sato ,Hajime Takahashi ,R E Chrien ,B Quinn ,A Rusek ,L Tang ,T Nagae ,M May ,T Miyoshi ,Osamu Hashimoto ,Y Miura ,T Kishimoto ,S N Nakamura ,L Yuan

doi:10.1016/j.nuclphysa.2005.02.127

Observation of hypernuclear fine structure in 16ΛO

M Ukai , J Franz + Show 30 more

https://doi.org/10.1016/j.nuclphysa.2005.02.127

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Journal: Nuclear physics. A

Publication Date: Mar 16, 2005

Affiliation: Tohoku University, University of Freiburg, Osaka University, RIKEN, Wako University, Kyoto University, GSI Helmholtz Centre for Heavy Ion Research, Brookhaven National Laboratory, Gifu University, Carnegie Mellon University, High Energy Accelerator Research Organization, Hampton University

#MeV Excited State #Germanium Detector Array + Show 8 more

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Abstract

We observed two γ-ray transitions of 16 Λ O in the 16O( K − , π − γ ) reaction using a germanium detector array, Hyperball. The γ rays are assigned as the M1 transitions from the 6 MeV excited state ( 1 − ) to the ground state doublet ( 1 − , 0 − ). The energies of the γ rays are 6534.1 ± 1.5 keV and 6560.2 ± 1.3 keV , and the energy spacing is 26.1 ± 2.0 keV , which corresponds to the ground state doublet spacing. From their yield ratio of 0.65 ± 0.11 ( N ( 6534 ) / N ( 6560 ) ) , the spin order of the ground state doublet is determined. This result gives a small value for the ΛN tensor force strength.

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