A charge plunger device to measure the lifetimes of excited nuclear states where transitions are dominated by internal conversion



Barber, L, Heery, J ORCID: 0000-0002-3023-9907, Cullen, DM, Singh, BS Nara, Herzberg, R-D ORCID: 0000-0001-9876-1518, Müller-Gatermann, C, Beeton, G, Bowry, M, Dewald, A, Grahn, T
et al (show 21 more authors) (2020) A charge plunger device to measure the lifetimes of excited nuclear states where transitions are dominated by internal conversion. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 979. p. 164454.

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Abstract

A charge plunger device has been commissioned based on the DPUNS plunger (Taylor et al., 2013) using the in-flight mass separator MARA at the University of Jyväskylä. The 152Sm(32S,4n)180Pt reaction was used to populate excited states in 180Pt. A lifetime measurement of the 21+ state was performed by applying the charge plunger technique, which relies on the detection of the charge state-distribution of recoils rather than the detection of the emitted γ rays. This state was a good candidate to test the charge plunger technique as it has a known lifetime and depopulates through a converted transition that competes strongly with γ-ray emission. The lifetime of the 21+ state was measured to be 480(10)ps, which is consistent with previously reported lifetimes that relied on the standard γ-ray techniques. The charge plunger technique is a complementary approach to lifetime measurements of excited states that depopulate through both γ-ray emission and internal conversion. In cases where it is not possible to detect Doppler-shifted γ rays, for example, in heavy nuclei where internal conversion dominates, it may well be the only feasible lifetime analysis approach.

Item Type: Article
Uncontrolled Keywords: charge plunger, plunger, nuclear-state lifetimes, RDDS, DDCM
Depositing User: Symplectic Admin
Date Deposited: 10 Sep 2020 12:44
Last Modified: 18 Jan 2023 23:34
DOI: 10.1016/j.nima.2020.164454
Open Access URL: https://doi.org/10.1016/j.nima.2020.164454
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3100678