1. Towards the Limits of Existence of Nuclear Structure: Observation and First Spectroscopy of the Isotope $^{31}$K by Measuring Its Three-Proton Decay
- Author
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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., Knöbel, R., Krupko, S., Kuich, M., Litvinov, Yu.A., Marquinez-Durán, G., Martel, I., Mazzocchi, C., Nociforo, C., Ordúz, A.K., Pfützner, M., Pietri, S., Pomorski, M., Prochazka, A., Rymzhanova, S., Sánchez-Benítez, A.M., Scheidenberger, C., Simon, H., Sitar, B., Slepnev, R., Stanoiu, M., Strmen, P., Szarka, I., Takechi, M., Tanaka, Y.K., Weick, H., Winkler, M., Winfield, J.S., Xu, X., Zhukov, M.V., Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
FOS: Physical sciences ,High Energy Physics::Experiment ,Nuclear Experiment (nucl-ex) ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Experiment ,Nuclear Physics - Abstract
The most-remote from stability isotope $^{31}$K, which is located four atomic mass units beyond the proton drip line, has been observed. It is unbound in respect to three-proton (${3p}$) emission, and its decays have been detected in flight by measuring trajectories of all decay products using micro-strip detectors. The $3p$-emission processes have been studied by means of angular correlations $^{28}$S+3$p$ and the respective decay vertexes. The energies of the previously-unknown ground and excited states of $^{31}$K have been determined. This provides its $3p$ separation-energy value $S_{3p}$ of $-4.6(2)$ MeV. Upper half-life limits of 10 ps of the observed $^{31}$K states have been derived from distributions of the measured decay vertexes., Comment: 6 pages, 5 figures
- Published
- 2019