Abstract
Several states of proton-unbound isotopes and were investigated by measuring their in-flight decay products, + proton + proton and + proton, respectively. A refined analysis of -proton angular correlations indicates that the ground state of is located at MeV above the two-proton emission threshold. The investigation of the decay mechanism of the ground state demonstrates that it has the transition dynamics. In the “transitional” region, the correlation patterns of the decay products present a surprisingly strong sensitivity to the two-proton decay energy of the ground state and the one-proton decay energy as well as the one-proton decay width of the ground state. The comparison of the experimental -proton angular correlations with those resulting from Monte Carlo simulations of the detector response illustrates that other observed excited states decay by sequential emission of protons via intermediate resonances in . Based on the findings, the decay schemes of the observed states in and were constructed. For calibration purposes and for checking the performance of the experimental setup, decays of the previously known states of a two-proton emitter were remeasured. Evidences for one new excited state in and two unknown states in were found.
9 More- Received 17 October 2017
- Revised 15 December 2017
DOI:https://doi.org/10.1103/PhysRevC.97.034305
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