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

J. Heery, L. Barber, J. Vilhena, B.S. Nara Singh, R.-D. Herzberg, D.M. Cullen, C. Müller-Gatermann, G. Beeton, M. Bowry, A. Dewald, T. Grahn, P.T. Greenlees, A. Illana, R. Julin, S. Juutinen, J.M. Keatings, M. Leino, M. Luoma, D. O'Donnell, J. OjalaJ. Pakarinen, P. Rahkila, P. Ruotslainen, M. Sandzelius, J. Sarén, J. Sinclair, J. F. Smith, J. Sorri, P. Spagnoletti, H. Tann, J. Uusitalo, G. Zimba

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Lifetime measurements in 178Pt with excited states de-exciting through γ-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 178Pt alpha decay (Ealpha = 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 γ rays and recoils is not feasible.
Original languageEnglish
Article number132
Number of pages11
JournalThe European Physical Journal A
Publication statusPublished - 16 Apr 2021


  • plunger
  • charger plunger
  • excited state lifetimes
  • DDCM
  • Bateman fit


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