L. Barber, J. Heery, D.M. Cullen, B.S. Nara Singh, R.-D. Herzberg, C. Müller-Gatermann, G. Beeton, M. Bowry, A. Dewald, T. Grahn, P.T. Greenlees, A. Illana, R. Julin, S. Juutinen, J.M. Keatings, M. Luoma, D. O’Donnell, J. Ojala, J. Pakarinen, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Sarén, J. Sinclair, J.F. Smith, J. Sorri, P. Spagnoletti, H. Tann, J. Uusitalo, J. Vilhena, G. Zimba, 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, Volume 979, 2020, 164454, ISSN 0168-9002, https://doi.org/10.1016/j.nima.2020.164454
A charge plunger device to measure the lifetimes of excited nuclear states where transitions are dominated by internal conversion
|Author:||Barber, L.1; Heery, J.2; Cullen, D. M.1;|
1Department of Physics & Astronomy, Schuster Building, The University of Manchester, Manchester, M13 9PL, United Kingdom
2Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
3School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley PA1 2BE, United Kingdom
4Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
5Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyvaskyla, Finland
6Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland
|Online Access:||PDF Full Text (PDF, 0.7 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2020111089862
|Publish Date:|| 2020-11-10
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)¹⁸⁰ reaction was used to populate excited states in ¹⁸⁰. A lifetime measurement of the state \(2_1^+\) 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 \(2_1^+\) 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.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
114 Physical sciences
This work was supported by the EU 7th Framework Programme, Integrating Activities Transnational Access, Project No. 262010 ENSAR and support from GAMMAPOOL for the loan of the JUROGAM 3 detectors. L.B. and D.M.C. acknowledge support of the Science and Technology Facilities Council, UK, Grant Nos. ST/L005794/1 and ST/P004423/1. C.M-G. and A.D. were supported by the Deutsche Forschungs Gemeinschaft (DFG), Germany under contract number DE 1516/5-1.
© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).