Study of exotic decay of Cs isotope close to the proton drip line

Piyush R Das ,V Pucknell,F Rotaru,R Lică ,T Stora,Ch Sotty ,Á Perea ,I Lazarus,Sovan Chakraborty ,Azizar Rahman ,S Pascu,L J Harkness-Brennan ,M Madurga,I Morroquin,N Mărginean ,C Mihai,D S Judson ,P T Greenlees,Abhijit Bhattacharyya ,A Negreţ ,A N Andreyev,A Gottberg,J Konki,M Huýse ,P Van Duppen,U Datta Pramanik ,Magdalena Kowalska ,E Nácher ,R D Page,R Mărginean ,E Rapisarda,V Vedia,O Tengblad,H De Witte,J Ray,J Kurcewicz,M J G Borge ,S Mandal,Reetesh Ranjan ,J Cederkäll ,L M Fraile,A Becerril,N Warr,P Rahkila,R Wadsworth

doi:10.1088/1742-6596/1643/1/012127

Abstract

The neutron-deficient 115Cs was produced at ISOLDE, CERN by spallation reaction using 1.4 GeV proton on LaC2 target. The exotic decay modes were studied by using a charged particle array (DSSD and pad detectors) and a γ-detector array (four Clovers) at the ISOLDE decay station (IDS). In this report, results on observed β-delayed particle emission from 115Cs, a nucleus close to proton drip line, is presented. By measuring the time distribution in the delayed proton spectrum, the half-life of the ground state of 115Cs was extracted. The obtained half-life is in agreement with previous reported value. For the first time, the p-unbound states of 115Xe, obtained by measuring beta-delayed protons from 115Cs is reported.

Highlights

The study of properties of nuclei near and beyond the drip lines provides unique information on n-n interaction that is important in understanding the limits of existence of the quantum many body systems i.e. atomic nuclei [1]
At ISOLDE decay station (IDS), a compact particle detection system consisting of four DSSDs (Double Sided Silicon Strip Detectors), stacked in telescope configuration with 4 PAD detectors
Where as the alpha spectrum can be obtained from the energy loss spectrum in the thin DSSD in anti-coincidence mode with consecutive PAD detector

Summary

Introduction

The study of properties of nuclei near and beyond the drip lines provides unique information on n-n interaction that is important in understanding the limits of existence of the quantum many body systems i.e. atomic nuclei [1]. At IDS, a compact particle detection system consisting of four DSSDs (Double Sided Silicon Strip Detectors), stacked in telescope configuration with 4 PAD detectors. The thin DSSDs (65 and 67 μm) are insensitive to β radiation but they stop low energy protons, alphas etc.

Results

Conclusion