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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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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 :
Gamba, E. R.
Bruce, A. M.
Lalkovski, S.
Bottoni, S.
Carpenter, M. P.
Zhu, S.
Anderson, J. T.
Ayangeakaa, A. D.
Berry, T.
Burrows, I.
Gallardo, M. Carmona
Carroll, R. J.
Copp, P.
Cullen, D. M.
Daniel, T.
Martínez, G. Fernández
Greene, J. P.
Gurgi, L.
Hartley, D. J.
Ilieva, S.
Kondev, F. G.
Kröll, T.
Lane, G. J.
Lauritsen, T.
Lazarus, I.
Niţă, C. R.
Pucknell, V.
Reed, M.
Regan, P.
Rohrer, J.
Sethi, J.
Seweryniak, D.
Shand, C.
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

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