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

: Barber, Liam; Cullen, David M.; Giles, M.M.; Nara Singh, B.S.; Mallaburn, M.J.; Beckers, Marcel; Blazhev, Andrey; Braunroth, Thomas; Dewald, Alfred; Fransen, Christoph; Goldkuhle, Alina; Jolie, Jan; Mammes, Franziska; Müller-Gatermann, Claus; Wölk, Dorothea; Zell, Karl Oskar

Volltext ()

Nuclear instruments and methods in physics research, Section A. Accelerators, spectrometers, detectors and associated equipment 950 (2020), Art. 162965, 6 S.
ISSN: 0167-5087
ISSN: 0168-9002
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer INT ()
RDDS; DDCM; UDCM; plunger; nuclear-state lifetime; unresolved Doppler-shifted component

A new method of extracting the γ-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 γ-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 yrast 2⁺₁ 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 γ-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.