2008/02/18 by M. Ukai, S. Ajimura, H. Akikawa +30
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Atomic and Molecular Physics #Nuclear physics research studies #nucl-ex
paper · pdf · doi:10.1103/physrevc.77.054315
published as Phys.Rev.C77:054315,2008 · 22 pages, 17 figures
arxiv created 2008/02/18 · openalex publication_date 2008/05/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
The bound-state level structures of the _\ensuremathΛ16O and _\ensuremathΛ15N hypernuclei were studied by \ensuremathγ-ray spectroscopy using a germanium detector array (Hyperball) via the 16O (K^\ensuremath-,\ensuremathπ^\ensuremath-\ensuremathγ) reaction. A level scheme for _\ensuremathΛ16O was determined from the observation of three \ensuremathγ-ray transitions from the doublet of states (2^\ensuremath-,1^\ensuremath-) at ~6.7 MeV to the ground-state doublet (1^\ensuremath-,0^\ensuremath-). The _\ensuremathΛ15N hypernuclei were produced via proton emission from unbound states in _\ensuremathΛ16O. Three \ensuremathγ rays were observed, and the lifetime of the 1/2+;1 state in _\ensuremathΛ15N was measured by the Doppler shift attenuation method. By comparing the experimental results with shell-model calculations, the spin dependence of the \ensuremathΛN interaction is discussed. In particular, the measured _\ensuremathΛ16O ground-state doublet spacing of 26.4\ifmmode±\else\textpm\fi1.6\ifmmode±\else\textpm\fi0.5 keV determines a small but nonzero strength of the \ensuremathΛN tensor interaction.