Giles, MM, Cullen, DM, Barber, L, Singh, BS Nara, Taylor, MJ, Smith, AJ, McFarlan, A, Read, C, Grahn, T, Badran, H et al (show 15 more authors)
(2019)
TPEN: A Triple-foil differential Plunger for lifetime measurements of excited states in Exotic Nuclei.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 923.
pp. 139-146.
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Abstract
A Triple-foil differential Plunger for Exotic Nuclei (TPEN) has been developed to measure the lifetimes of excited states in nuclei with small production cross-sections. TPEN utilises one target foil and two degrader foils to make differential lifetime measurements: directly determining the decay function and its derivative at a single plunger distance setting. The direct measurement of the decay function and its derivative removes the requirement to measure γ-ray intensities at several target-to-degrader distances, thereby reducing the beam-time required relative to a conventional plunger with a single-degrader foil. This paper describes the commissioning of TPEN in the lifetime measurement of the first excited 4 + state in 156 Dy using this differential lifetime technique. The 46(2) ps measured lifetime was found to be in good agreement with the 45.6(5) ps deduced from a previous high-statistics experiment using a conventional two-foil plunger. A comparison between the differential mode with TPEN, and that using TPEN as a conventional two-foil plunger reveals that it achieves the same statistical accuracy with a ∼4-fold reduction in beam-time in the differential mode, for the reaction and experimental setup used in this work. TPEN opens up new opportunities to study exotic nuclei with lower production cross-sections that were previously not accessible.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Plunger, Triple-foil plunger, Excited-state lifetimes, Dy-156, RDDS, DDCM |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 23 May 2019 12:50 |
| Last Modified: | 19 Jan 2023 00:57 |
| DOI: | 10.1016/j.nima.2019.01.089 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3034173 |
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