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). https://doi.org/10.1140/epja/s10050-021-00425-8

### 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)
Persistent link: http://urn.fi/urn:nbn:fi-fe2021061436822
Language: English
Published: Springer Nature, 2021
Publish Date: 2021-06-14
Description:

# Abstract

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
OADOI: https://oadoi.org/10.1140/epja/s10050-021-00425-8
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Subjects:
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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