A charge plunger device to measure the lifetimes of excited nuclear states where transitions are dominated by internal conversion
Barber, L.; Heery, J.; Cullen, D. M.; Singh, B. S. Nara; Herzberg, R.-D.; Müller-Gatermann, C.; Beeton, G.; Bowry, M.; Dewald, A.; Grahn, T.; Greenlees, P. T.; Illana, A.; Julin, R.; Juutinen, S.; Keatings, J. M.; Luoma, M.; O’Donnell, D.; Ojala, J.; Pakarinen, J.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Sarén, J.; Sinclair, J.; Smith, J. F.; Sorri, J.; Spagnoletti, P.; Tann, H.; Uusitalo, J.; Vilhena, J.; Zimba, G. (2020-07-25)
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
© 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/).
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe2020111089862
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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)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.
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