Towards the Limits of Existence of Nuclear Structure: Observation and First Spectroscopy of the Isotope 31K by Measuring Its Three-Proton Decay
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Abstract
The most remote isotope from the proton dripline (by 4 atomic mass units) has been observed: 31K. It is unbound with respect to three-proton (3 p ) emission, and its decays have been detected in flight by measuring the trajectories of all decay products using microstrip detectors. The 3 p emission processes have been studied by the means of angular correlations of 28S +3 p and the respective decay vertices. The energies of the previously unknown ground and excited states of 31K have been determined. This provides its 3 p separation energy value S3 p of -4.6 (2 ) MeV . Upper half-life limits of 10 ps of the observed 31K states have been derived from distributions of the measured decay vertices.
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Kostyleva, D., Mukha, I., Acosta, L., Casarejos, E., Chudoba, V., Ciemny, A. A., Dominik, W., Dueñas, J. A., Dunin, V., Espino, J. M., Estradé, A., Farinon, F., Fomichev, A., Geissel, H., Gorshkov, A., Grigorenko, L. V., Janas, Z., Kamiński, G., Kiselev, O., … Zhukov, M. V. (2019). Towards the Limits of Existence of Nuclear Structure: Observation and First Spectroscopy of the Isotope 31K by Measuring Its Three-Proton Decay. In Physical Review Letters (Vol. 123, Issue 9). American Physical Society (APS). https://doi.org/10.1103/physrevlett.123.092502
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