Regular Article – Experimental Physics
Lifetime measurements of yrast states in Pt using the charge plunger method with a recoil separator
Department of Physics, Oliver Lodge Laboratory, University of Liverpool, L69 7ZE, Liverpool, UK
2 Department of Physics and Astronomy, The University of Manchester, Schuster Building, M13 9PL, Manchester, UK
3 School of Computing, Engineering and Physical Sciences, University of the West of Scotland, PA1 2BE, Paisley, UK
4 Institut für Kernphysik, Universität zu Köln, 50937, Köln, Germany
5 Department of Physics, University of Jyväskylä, P.O. Box 35, 40014, Jyväskylä, Finland
6 Sodankylä Geophysical Observatory, University of Oulu, 99600, Sodankylä, Finland
7 Physics Division, Argonne National Laboratory, 60439, Argonne, IL, USA
8 Radiation and Nuclear Safety Authority - STUK, Laippatie 4, 00880, Helsinki, Finland
9 Department of Chemistry, Simon Fraser University, V5A 1S6, Burnaby, BC, Canada
Accepted: 7 March 2021
Published online: 16 April 2021
Lifetime measurements in Pt with excited states de-exciting through -ray transitions and internal electron conversions have been performed. Ionic charges were selected by the in-flight mass separator MARA and measured at the focal plane in coincidence with the keV -ray transition detected using the JUROGAM 3 spectrometer. The resulting charge-state distributions were analysed using the differential decay curve method (DDCM) framework to obtain a lifetime value of 430(20) ps for the state. This work builds on a method that combines the charge plunger technique with the DDCM analysis. As an alternative analysis, ions were selected in coincidence with the Pt alpha decay ( MeV) at the focal plane. Lifetime information was obtained by fitting a two-state Bateman equation to the decay curve with the lifetime of individual states defined by a single quadrupole moment. This yielded a lifetime value of 430(50) ps for the state, and 54(6) ps for the state. An analysis method based around the Bateman equation will become especially important when using the charge plunger method for the cases where utilising coincidences between prompt rays and recoils is not feasible.
© The Author(s) 2021
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