Two-proton emission from the ground state of 12O.
نویسندگان
چکیده
The three-body decay ' 0 ~ 2p + 'OC was studied following production via single-neutron stripping from a radioactive "0 projectile. This is the first observation of two-proton emission from an unbound ground state where the one-proton emission channel is energetically closed beyond the lightest case of Be. No evidence for He emission is seen, despite predictions for a large diproton branching ratio. An upper limit of 7% (95% C.L.) is established for this decay branch. The implications of the small diproton branching ratio observed here and seen previously in Be are discussed.
منابع مشابه
Two - proton decay of 12 O and its isobaric analog state in 12
Following neutron knockout from an 13O beam, 12O fragments were created and the three decay products following two-proton decay were detected. A new ground-state mass was determined by the invariant mass method implying a decay kinetic energy of 1.638(24) MeV, and the width was found to be less than 72 keV. The latter is inconsistent with previous measurements with lower experimental resolution...
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عنوان ژورنال:
- Physical review letters
دوره 74 6 شماره
صفحات -
تاریخ انتشار 1995