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. N., 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., . . . Zimba, G. (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, Article 164454. https://doi.org/10.1016/j.nima.2020.164454
Authors
Tann, H. |
Date
2020Copyright
© 2020 the Authors
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.
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https://converis.jyu.fi/converis/portal/detail/Publication/41656299
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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, Grant Nos. ST/L005794/1 and ST/P004423/1. C.M-G and A.D were supported by the Deutsche Forschungs Gemeinschaft (DFG) under contract number DE 1516/5-1.![showless](/themes/JYX2//images/showless.png)
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