1. A charge plunger device to measure the lifetimes of excited nuclear states where transitions are dominated by internal conversion
- Author
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Barber, L. (L.), Heery, J. (J.), Cullen, D. M. (D. M.), Singh, B. S. (B. S. Nara), Herzberg, R.-D. (R.-D.), Müller-Gatermann, C. (C.), Beeton, G. (G.), Bowry, M. (M.), Dewald, A. (A.), Grahn, T. (T.), Greenlees, P. T. (P. T.), Illana, A. (A.), Julin, R. (R.), Juutinen, S. (S.), Keatings, J. M. (J. M.), Luoma, M. (M.), O’Donnell, D. (D.), Ojala, J. (J.), Pakarinen, J. (J.), Rahkila, P. (P.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Sarén, J. (J.), Sinclair, J. (J.), Smith, J. F. (J. F.), Sorri, J. (J.), Spagnoletti, P. (P.), Tann, H. (H.), Uusitalo, J. (J.), Vilhena, J. (J.), and Zimba, G. (G.)
- Subjects
DDCM ,Plunger ,RDDS ,Charge plunger ,Nuclear-state lifetimes - 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.
- Published
- 2020