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First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

P. FinlayInstituut voor Kern-en Stralingsfysica, KU Leuven University, Celestijnenlaan 200D, 3001, Leuven, BelgiumM. BreitenfeldtInstituut voor Kern-en Stralingsfysica, KU Leuven University, Celestijnenlaan 200D, 3001, Leuven, BelgiumT. PorobićInstituut voor Kern-en Stralingsfysica, KU Leuven University, Celestijnenlaan 200D, 3001, Leuven, BelgiumE. WurstenInstituut voor Kern-en Stralingsfysica, KU Leuven University, Celestijnenlaan 200D, 3001, Leuven, BelgiumG. BanLaboratoire de Physique Corpusculaire de CaenM. BeckInstitut für Kernphysik, Universität Münster, Wilhelm-Klemm-Strasse 9, D-48149, Münster, GermanyC. CouratinInstituut voor Kern-en Stralingsfysica, KU Leuven University, Celestijnenlaan 200D, 3001, Leuven, BelgiumX. FabianUniversité de Caen NormandieX. FléchardÉcole Nationale Supérieure d'Ingénieurs de CaenP. FriedagInstitut für Kernphysik, Universität Münster, Wilhelm-Klemm-Strasse 9, D-48149, Münster, GermanyF. GlückInstitut für Kernphysik, Karlsruhe Institute of Technology, Postfach 3640, 76021, Karlsruhe, GermanyA. HerlertFAIR, Darmstadt, GermanyA. KnechtPH Department, CERN, CH-1211, Geneva 23, SwitzerlandВ. КозловInstitut für Kernphysik, Karlsruhe Institute of Technology, Postfach 3640, 76021, Karlsruhe, GermanyE. LiénardUniversité de Caen NormandieG. SotiInstituut voor Kern-en Stralingsfysica, KU Leuven University, Celestijnenlaan 200D, 3001, Leuven, BelgiumM. TandeckiTRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver BC, CanadaE. TraykovGrand Accélérateur National d'Ions LourdsS. Van GorpAtomic Physics Laboratory, RIKEN, 351-0198, Saitama, JapanC. WeinheimerInstitut für Kernphysik, Universität Münster, Wilhelm-Klemm-Strasse 9, D-48149, Münster, GermanyD. ZákouckýNuclear Physics Institute, ASCR, Rez, Czech RepublicN. SeverijnsInstituut voor Kern-en Stralingsfysica, KU Leuven University, Celestijnenlaan 200D, 3001, Leuven, Belgium

The European Physical Journal Ajournal2016en

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Annotatsiya

The first high-statistics and high-resolution data set for the integrated recoil-ion energy spectrum following the $ \beta^+$ decay of 35Ar has been collected with the WITCH retardation spectrometer located at CERN-ISOLDE. Over 25 million recoil-ion events were recorded on a large-area multichannel plate (MCP) detector with a time-stamp precision of 2ns and position resolution of 0.1mm due to the newly upgraded data acquisition based on the LPC Caen FASTER protocol. The number of recoil ions was measured for more than 15 different settings of the retardation potential, complemented by dedicated background and half-life measurements. Previously unidentified systematic effects, including an energy-dependent efficiency of the main MCP and a radiation-induced time-dependent background, have been identified and incorporated into the analysis. However, further understanding and treatment of the radiation-induced background requires additional dedicated measurements and remains the current limiting factor in extracting a beta-neutrino angular correlation coefficient for 35Ar decay using the WITCH spectrometer.

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Particle physics theoretical and experimental studies Neutrino Physics Research Nuclear physics research studies

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DOI: 10.1140/epja/i2016-16206-y

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