Abstract
The sequential two-proton decay of the second excited state in , produced by inelastic excitation at intermediate energy, is studied. This state is found to be highly spin aligned, providing another example of a recently discovered alignment mechanism. The fortuitous condition that the second decay step is slightly more energetic than the first, permits the lifetime of the one-proton daughter, the ground state of , to be determined from the magnitude of the final-state interactions between the protons. This new method gave a result [ keV] consistent with that obtained by directly measuring the width of the state [ keV]. This width allows one to determine the continuum coupling constant in this mass region. Real-energy continuum-shell-model studies yield a satisfactory description of both spectra and widths of low-energy resonances in and suggest an unusual large ratio of proton-proton to proton-neutron continuum couplings in the vicinity of the proton drip line.
1 More- Received 7 February 2018
DOI:https://doi.org/10.1103/PhysRevC.97.054318
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