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Article
Title	Exotic decay of $^{115}$Cs
Author(s)	Das, P (Saha Inst. ; HBNI, Mumbai) ; Datta, Ushasi (Saha Inst. ; HBNI, Mumbai) ; Chakraborty, S (Saha Inst. ; Pailan Coll. Mgt. Tech.) ; Rahaman, A (Saha Inst. ; A.C. Coll., Jalpaiguri) ; Tengblad, O (Madrid, Inst. Estructura Materia) ; Agrawal, B K (Saha Inst. ; HBNI, Mumbai) ; Becerril, A (Madrid, Inst. Estructura Materia) ; Cederkall, J (Lund U. (main)) ; Dey, J (Saha Inst. ; HBNI, Mumbai) ; Gottberg, A (CERN ; TRIUMF) ; Imam, Sk Md Adil (Saha Inst. ; HBNI, Mumbai) ; Kowalska, M (CERN ; Geneva U.) ; Kurcewicz, J (CERN) ; Lund, M (Aarhus U. (main)) ; Mandal, S (Delhi Tech. U.) ; Madurga, M (CERN) ; Marginean, N (Bucharest U.) ; Marginean, R (Bucharest U.) ; Mihai, C (Bucharest U.) ; Marroquin, I (Madrid, Inst. Estructura Materia) ; Nacher, E (Madrid, Inst. Estructura Materia) ; Negret, A (Bucharest U.) ; Pascu, S (Bucharest U.) ; Perea, A (Madrid, Inst. Estructura Materia) ; Rapisarda, E (CERN) ; Rotaru, F (Bucharest U.) ; Ray, J (Saha Inst.) ; Sharma, P (Saha Inst.) ; Stora, T (CERN) ; Sotty, C (Bucharest U.) ; Vedia, V (INFN, Milan) ; Warr, N (Cologne U.) ; Wadsworth, R (Unlisted, UK)
Publication	2023
Number of pages	6
In:	Phys. Rev. C 108 (2023) 064304
DOI	10.1103/PhysRevC.108.064304 (publication)
Subject category	Nuclear Physics - Theory
Accelerator/Facility, Experiment	CERN ISOLDE
Abstract	The detailed study of the β+/EC decay of the very neutron-deficient and alpha-unbound nucleus Cs115 is presented. The measurement was performed at the ISOLDE, CERN where delayed charged particles and γ rays were detected. The observed delayed γ rays are in agreement with the previously reported characteristics γ rays of Xe115. Based on the experimental observations, the tentative ground-state spin of Cs115 is suggested to be 7/2+ or 9/2+. Furthermore, the measured decay branching ratio of delayed protons exceeds the previously reported value. Additionally, new delayed α-branching ratio and several reconstructed proton and α-unbound excited states of Xe115 are being reported for the first time. The properties of proton-unbound states at excitation energies from 3.9–7.9 MeV have been obtained by fitting the delayed proton spectrum via the Bayesian method. The measured lifetimes of these proton-unbound states are in the order of zeptoseconds.
Copyright/License	publication: © 2023-2024 authors (License: CC-BY-4.0)

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