학술논문
Towards the Limits of Existence of Nuclear Structure: Observation and First spectroscopy of the Isotope $^{31}$K by measuring its three-proton Decay
Document Type
Working Paper
Author
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.; Stanoiu, M.; Strmen, P.; Szarka, I.; Takechi, M.; Tanaka, Y. K.; Weick, H.; Winkler, M.; Winfield, J. S.; Xu, X.; Zhukov, M. V.
Source
Phys. Rev. Lett. 123, 092502 (2019)
Subject
Language
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
Comment: 6 pages, 5 figures