University of Oulu

Heery, J., Barber, L., Vilhena, J. et al. Lifetime measurements of yrast states in ¹⁷⁸ Pt using the charge plunger method with a recoil separator. Eur. Phys. J. A 57, 132 (2021).

Lifetime measurements of yrast states in ¹⁷⁸ Pt using the charge plunger method with a recoil separator

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Author: Heery, J.1; Barber, L.2; Vilhena, J.3;
Organizations: 1Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England.
2Univ Manchester, Dept Phys & Astron, Schuster Bldg, Manchester M13 9PL, Lancs, England.
3Univ West Scotland, Sch Comp Engn & Phys Sci, Paisley PA1 2BE, Renfrew, Scotland.
4Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany.
5Argonne Natl Lab, Phys Div, Argonne, IL 60439 USA.
6Univ Jyvaskyla, Dept Phys, POB 35, Jyvaskyla 40014, Finland.
7Univ Oulu, Sodankyla Geophys Observ, Sodankyla 99600, Finland.
8Radiat & Nucl Safety Author STUK, Laippatie 4, Helsinki 00880, Finland.
9Simon Fraser Univ, Dept Chem, Burnaby, BC V5A 1S6, Canada.
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.9 MB)
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Language: English
Published: Springer Nature, 2021
Publish Date: 2021-06-14


Lifetime measurements in \(^{178}\)Pt with excited states de-exciting through \(\gamma\)-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 \(4^{+}_{1}→2^{+}_{1}\) 257 keV γ-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 \(2^{+}_{1}\) 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 \(^{178}\)Pt alpha decay (\(E_{\mathrm {alpha}} = 5.458(5)\) 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 \(2^{+}_{1}\) state, and 54(6) ps for the \(4^{+}_{1}\) 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 \(\gamma\) rays and recoils is not feasible.

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Series: European physical journal. A, Hadrons and nuclei
ISSN: 1434-6001
ISSN-E: 1434-601X
ISSN-L: 1434-6001
Volume: 57
Issue: 4
DOI: 10.1140/epja/s10050-021-00425-8
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: This work was supported by the EU 7th Framework Programme, Integrating Activities Transnational Access, Project No. 262010 ENSAR. We acknowledge GAMMAPOOL support for the loan of the JUROGAM 3 detectors. J.H. acknowledges support of the Science and Technology Facilities Council, UK, Grant No. ST/R504920/1. C.M-G. and A.D. were supported by the Deutsche Forschungs Gemeinschaft (DFG), Germany, under contract number DE 1516/5-1. L.B. and D.M.C. acknowledge support of the Science and Technology Facilities Council, UK, Grant Nos. ST/L005794/1 and ST/P004423/1.
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