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Fast-timing measurements in the ground-state band of ¹¹⁴Pd

Gamba, E. R., Bruce, A. M., Lalkovski, S., Rudigier, M., Bottoni, S., Carpenter, M. P., Zhu, S., Anderson, J. T., Ayangeakaa, A. D., Berry, T. A. , Burrows, I., Gallardo, M. Carmona, Carroll, R. J., Copp, P., Cullen, D. M., Daniel, T., Martínez, G. Fernández, Greene, J. P., Gurgi, L. A., Hartley, D. J., Ilieva, R., Ilieva, S., Kondev, F. G., Kröll, T., Lane, G. J., Lauritsen, T., Lazarus, I., Lotay, G., Niţă, C. R., Podolyak, Zs., Pucknell, V., Reed, M., Regan, P. H., Rohrer, J., Sethi, J., Seweryniak, D., Shand, C. M., Simpson, J., Smoleń, M., Stefanova, E. A., Vedia, V. and Yordanov, O. (2019) Fast-timing measurements in the ground-state band of ¹¹⁴Pd Physical Review C, 100 (4), 044309. 044309-1.

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Abstract

Using a hybrid Gammasphere array coupled to 25 LaBr3(Ce) detectors, the lifetimes of the first three levels of the yrast band in ¹¹⁴Pd populated via ²⁵²Cf decay, have been measured. The measured lifetimes are τ₂+=103(10)ps, τ₄+=22(13)ps, and τ₆+≤10ps for the 2⁺₁, 4⁺₁, and 6⁺₁ levels, respectively. Palladium-114 was predicted to be the most deformed isotope of its isotopic chain, and spectroscopic studies have suggested it might also be a candidate nucleus for low-spin stable triaxiality. From the lifetimes measured in this work, reduced transition probabilities B(E2;J→J−2) are calculated and compared with interacting boson model, projected shell model, and collective model calculations from the literature. The experimental ratio RB(E₂)=B(E2;4⁺₁→2⁺₁)/B(E2;2⁺₁→0⁺₁)=0.80(42) is measured for the first time in ¹¹⁴Pd and compared with the known values RB(E₂) in the palladium isotopic chain: the systematics suggest that, for N=68, a transition from γ-unstable to a more rigid γ-deformed nuclear shape occurs.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Gamba, E. R.
Bruce, A. M.
Lalkovski, S.
Rudigier, M.m.rudigier@surrey.ac.uk
Bottoni, S.
Carpenter, M. P.
Zhu, S.
Anderson, J. T.
Ayangeakaa, A. D.
Berry, T. A.t.berry@surrey.ac.uk
Burrows, I.
Gallardo, M. Carmona
Carroll, R. J.
Copp, P.
Cullen, D. M.
Daniel, T.
Martínez, G. Fernández
Greene, J. P.
Gurgi, L. A.l.a.gurgi@surrey.ac.uk
Hartley, D. J.
Ilieva, R.r.ilieva@surrey.ac.uk
Ilieva, S.
Kondev, F. G.
Kröll, T.
Lane, G. J.
Lauritsen, T.
Lazarus, I.
Lotay, G.g.lotay@surrey.ac.uk
Niţă, C. R.
Podolyak, Zs.Z.Podolyak@surrey.ac.uk
Pucknell, V.
Reed, M.
Regan, P. H.P.Regan@surrey.ac.uk
Rohrer, J.
Sethi, J.
Seweryniak, D.
Shand, C. M.c.shand@surrey.ac.uk
Simpson, J.
Smoleń, M.
Stefanova, E. A.
Vedia, V.
Yordanov, O.
Date : 11 October 2019
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1103/PhysRevC.100.044309
Copyright Disclaimer : ©2019 American Physical Society
Depositing User : Clive Harris
Date Deposited : 01 Nov 2019 14:03
Last Modified : 01 Nov 2019 14:03
URI: http://epubs.surrey.ac.uk/id/eprint/853028

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