Author:
Vitéz-Sveiczer A.,Algora A.,Kiss G.G.,Rubio B.,Morales A.I.,Sarriguren P.,de Angelis G.,Recchia F.,Nishimura S.,Agramunt J.,Guadilla V.,Montaner-Pizá A.,Orrigo S.E.A.,Horváth Á.,Napoli D.,Lenzi S.,Boso A.,Phong V.,Wu J.,Söderström P.-A.,Sumikama T.,Suzuki H.,Takeda H.,Ahn D.S.,Baba H.,Doornenbal P.,Fukuda N.,Inabe N.,Isobe T.,Kubo T.,Kubono S.,Sakurai H.,Shimizu Y.,Sidong C.,Blank B.,Ascher P.,Gerbaux M.,Goigoux T.,Giovinazzo J.,Grévy S.,Kurtukián Nieto T.,Magron C.,Gelletly W.,Dombrádi Zs.,Fujita Y.,Tanaka M.,Aguilera P.,Molina F.,Eberth J.,Diel F.,Lubos D.,Borcea C.,Ganioglu E.,Nishimura D.,Oikawa H.,Takei Y.,Yagi S.,Korten W.,de France G.,Davies P.,Liu J.,Lee J.,Lokotko T.,Kojouharov I.,Kurz N.,Shaffner H.,Petrovici A.
Abstract
The very proton-rich 71Kr isotope was produced through the in-flight fragmentation of 78Kr on a beryllium target at RIKEN – Nishina Center in order to study its β-decay properties. A stack of double-sided silicon strip detectors, called WAS3ABi, was used as the decay station, where the detection of ion implants, β-decays and β-delayed protons took place. Beta-delayed γ-rays were measured using a system of 84 HPGe detectors, called EURICA, surrounding the decay station. The main goal of the present study was the precise measurement of the half-life of 71Kr, as in the literature there is an almost 10 σ difference between the most precise independent results. Implant–β time correlations, implant–proton time correlations and implant–β–γ time correlations were all used to derive the half-life value, followed by a thorough investigation of systematic uncertainties for each method. As these values were found to be consistent, the weighted average t1/2 = 94.40+19ms is reported as a new half-life value in this work. Furthermore a total of 26 previously unreported γ following the β-decay of 71Kr were also identified in the analysis.