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

0471144 - ÚJF 2017 RIV US eng J - Článek v odborném periodiku
Finlay, P. - Breitenfeldt, M. - Porobic, T. - Wursten, E. - Ban, G. - Beck, M. - Couratin, C. - Fabian, X. - Flechard, X. - Friedag, P. - Gluck, F. - Herlert, A. - Knecht, A. - Kozlov, V. Y. - Lienard, E. - Soti, G. - Tandecki, M. - Traykov, E. - Van Gorp, S. - Weinheimer, C. - Zákoucký, Dalibor - Severijns, N.
First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer.
European Physical Journal A. Roč. 52, č. 7 (2016), č. článku 206. ISSN 1434-6001. E-ISSN 1434-601X
Grant CEP: GA MŠMT(CZ) LG13031; GA MŠMT(CZ) LG15052
Institucionální podpora: RVO:61389005
Klíčová slova: beta-decay * multichannel plate detector
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 2.833, rok: 2016

The first high-statistics and high-resolution data set for the integrated recoil-ion energy spectrum following the beta(+) decay of Ar-35 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 2 ns and position resolution of 0.1 mm 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 Ar-35 decay using the WITCH spectrometer.
Trvalý link: http://hdl.handle.net/11104/0268585