Recoil distance method lifetime measurements at TRIUMF-ISAC using the TIGRESS Integrated Plunger

A. Chester*, G. C. Ball, N. Bernier, D. S. Cross, T. Domingo, T. E. Drake, L. J. Evitts, F. H. Garcia, A. B. Garnsworthy, G. Hackman, S. Hallam, J. Henderson, R. Henderson, R. Krücken, E. MacConnachie, M. Moukaddam, E. Padilla-Rodal, O. Paetkau, J. L. Pore, U. RizwanP. Ruotsalainen, J. Shoults, J. Smallcombe, J. K. Smith, K. Starosta, C. E. Svensson, K. Van Wieren, J. Williams, M. Williams

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The TIGRESS Integrated Plunger device (TIP) has been developed for recoil distance method (RDM) lifetime measurements using the TIGRESS array of HPGe γ-ray detectors at TRIUMF's ISAC-II facility. A commissioning experiment was conducted utilizing a 250 MeV 84Kr beam at ≈2×108 particles per second. The 84Kr beam was Coulomb excited to the 21+ state on a movable 27Al target. A thin Cu foil fixed downstream from the target was used as a degrader. Excited nuclei emerged from the target and decayed by γ-ray emission at a distance determined by their velocity and the lifetime of the 21+ state. The ratio of decays which occur between the target and degrader to those occurring after traversing the degrader changes as a function of the target–degrader separation distance. Gamma-ray spectra at 13 target–degrader separation distances were measured and compared to simulated lineshapes to extract the lifetime. The result of τ=5.541±0.013(stat.)±0.063(sys.) ps is shorter than the literature value of 5.84±0.18 ps with a reduction in uncertainty by a factor of approximately two. The TIP plunger device, experimental technique, analysis tools, and result are discussed.

Original languageEnglish (US)
Pages (from-to)69-83
Number of pages15
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
StatePublished - Feb 21 2018
Externally publishedYes


  • Coulomb excitation
  • CsI(Tl) pulse shape analysis
  • Doppler-shift lifetime methods
  • Gamma-ray spectroscopy
  • Monte Carlo analysis

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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