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. 2019 Aug 30;123(9):092502.
doi: 10.1103/PhysRevLett.123.092502.

Towards the Limits of Existence of Nuclear Structure: Observation and First Spectroscopy of the Isotope ^{31}K by Measuring Its Three-Proton Decay

D Kostyleva  1   2 , I Mukha  1 , L Acosta  3   4 , E Casarejos  5 , V Chudoba  6   7 , A A Ciemny  8 , W Dominik  8 , J A Dueñas  9 , V Dunin  10 , J M Espino  11 , A Estradé  12 , F Farinon  1 , A Fomichev  6 , H Geissel  1   2 , A Gorshkov  6 , L V Grigorenko  6   13   14 , Z Janas  8 , G Kamiński  6   15 , O Kiselev  1 , R Knöbel  1   2 , S Krupko  6 , M Kuich  8   16 , Yu A Litvinov  1 , G Marquinez-Durán  17 , I Martel  18 , C Mazzocchi  8 , C Nociforo  1 , A K Ordúz  19 , M Pfützner  1   8 , S Pietri  1 , M Pomorski  8 , A Prochazka  1 , S Rymzhanova  6 , A M Sánchez-Benítez  20 , C Scheidenberger  1   2 , H Simon  1 , B Sitar  21 , R Slepnev  6 , M Stanoiu  22 , P Strmen  21 , I Szarka  21 , M Takechi  1 , Y K Tanaka  1   23 , H Weick  1 , M Winkler  1 , J S Winfield  1 , X Xu  1   2   24 , M V Zhukov  25
Affiliations

Towards the Limits of Existence of Nuclear Structure: Observation and First Spectroscopy of the Isotope ^{31}K by Measuring Its Three-Proton Decay

D Kostyleva et al. Phys Rev Lett. .

Abstract

The most remote isotope from the proton dripline (by 4 atomic mass units) has been observed: ^{31}K. It is unbound with respect to three-proton (3p) emission, and its decays have been detected in flight by measuring the trajectories of all decay products using microstrip detectors. The 3p emission processes have been studied by the means of angular correlations of ^{28}S+3p and the respective decay vertices. 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 vertices.

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