Performing the differential decay curve method on gamma-ray transitions with unresolved Doppler-shifted components

L. Barber*, D.M. Cullen, M.M. Giles, B.S. Nara Singh, M.J. Mallaburn, M. Beckers, A. Blazhev, T. Braunroth, A. Dewald, C. Fransen, A. Goldkuhle, J. Jolie, F. Mammes, C. Muller-Gatermann, D. Wolk, K.O. Zell

*Corresponding author for this work

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A new method of extracting the gamma-ray intensities necessary to perform lifetime measurements using the differential decay curve method (DDCM) is presented in this work, the unresolved Doppler-shifted components method (UDCM). The UDCM allows for a DDCM analysis to be performed using a gamma-ray transition for which the fully Doppler-shifted and degraded components are unresolvable in energy and so are detected as a single peak. This technique was used to measure the known lifetime of the 2_1^+ yrast state in 50Mn with a depopulating transition that does not have resolvable fully Doppler-shifted and degraded components. The lifetime measured through applying the UDCM was consistent with the standard DDCM measurement of the 2_1^+ state. Use of the UDCM allows for DDCM lifetime measurements to be made using transitions of smaller gamma-ray energies, smaller recoil velocities and, in some cases, with a smaller uncertainty. In contrast to a standard DDCM analysis, a UDCM analysis is also independent of the widths of the fully Doppler-shifted and degraded components and as a result they do not need to be determined.
Original languageEnglish
Article number162965
Number of pages6
JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Early online date14 Oct 2019
Publication statusPublished - 11 Jan 2020
Externally publishedYes



  • RDDS
  • DDCM
  • UDCM
  • Plunger
  • Nuclear-state lifetimes
  • Unresolved Doppler-shifted components

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