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2 results on '"Tann, H. (H.)"'

1. Lifetime measurements of yrast states in ¹⁷⁸ Pt using the charge plunger method with a recoil separator

Author

Heery, J. (J.), Barber, L. (L.), Vilhena, J. (J.), Singh, B. S. (B. S. Nara), Herzberg, R. -. (R. -D.), Cullen, D. M. (D. M.), Mueller-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.), Leino, M. (M.), Luoma, M. (M.), O'Donnell, D. (D.), Ojala, J. (J.), Pakarinen, J. (J.), Rahkila, P. (P.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Saren, J. (J.), Sinclair, J. (J.), Smith, J. F. (J. F.), Sorri, J. (J.), Spagnoletti, P. (P.), Tann, H. (H.), Uusitalo, J. (J.), Zimba, G. (G.), Heery, J. (J.), Barber, L. (L.), Vilhena, J. (J.), Singh, B. S. (B. S. Nara), Herzberg, R. -. (R. -D.), Cullen, D. M. (D. M.), Mueller-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.), Leino, M. (M.), Luoma, M. (M.), O'Donnell, D. (D.), Ojala, J. (J.), Pakarinen, J. (J.), Rahkila, P. (P.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Saren, J. (J.), Sinclair, J. (J.), Smith, J. F. (J. F.), Sorri, J. (J.), Spagnoletti, P. (P.), Tann, H. (H.), Uusitalo, J. (J.), and Zimba, G. (G.)

Abstract

Lifetime measurements in \(^{178}\)Pt with excited states de-exciting through \(\gamma\)-ray transitions and internal electron conversions have been performed. Ionic charges were selected by the in-flight mass separator MARA and measured at the focal plane in coincidence with the \(4^{+}_{1}→2^{+}_{1}\) 257 keV γ-ray transition detected using the JUROGAM 3 spectrometer. The resulting charge-state distributions were analysed using the differential decay curve method (DDCM) framework to obtain a lifetime value of 430(20) ps for the \(2^{+}_{1}\) state. This work builds on a method that combines the charge plunger technique with the DDCM analysis. As an alternative analysis, ions were selected in coincidence with the \(^{178}\)Pt alpha decay (\(E_{\mathrm {alpha}} = 5.458(5)\) MeV) at the focal plane. Lifetime information was obtained by fitting a two-state Bateman equation to the decay curve with the lifetime of individual states defined by a single quadrupole moment. This yielded a lifetime value of 430(50) ps for the \(2^{+}_{1}\) state, and 54(6) ps for the \(4^{+}_{1}\) state. An analysis method based around the Bateman equation will become especially important when using the charge plunger method for the cases where utilising coincidences between prompt \(\gamma\) rays and recoils is not feasible.

Published
2021

2. A charge plunger device to measure the lifetimes of excited nuclear states where transitions are dominated by internal conversion

Author

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

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