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

E.R. Gamba; A.M. Bruce; S. Lalkovski; M. Rudigier; S. Bottoni; M.P. Carpenter; S. Zhu; J.T. Anderson; A.D. Ayangeakaa; T.A. Berry; I. Burrows; M. Carmona Gallardo; R.J. Carroll; P. Copp; D.M. Cullen; T. Daniel; G. Fernandez Martinez; J.P. Greene; L.A. Gurgi; D.J. Hartley; R. Ilieva; S. Ilieva; F.G. Kondev; T. Kroell; G.J. Lane; T. Lauritsen; I. Lazarus; G. Lotay; C.R. Nita; Zs. Podolyak; V. Pucknell; M. Reed; P.H. Regan; J. Rohrer; J. Sethi; D. Seweryniak; C.M. Shand; J. Simpson; M. Smolen; E. A. Stefanova; V. Vedia; O. Yordanov

doi:10.1103/PhysRevC.100.044309

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

E.R. Gamba, A.M. Bruce^*, S. Lalkovski, M. Rudigier, S. Bottoni, M.P. Carpenter, S. Zhu, J.T. Anderson, A.D. Ayangeakaa, T.A. Berry, I. Burrows, M. Carmona Gallardo, R.J. Carroll, P. Copp, D.M. Cullen, T. Daniel, G. Fernandez Martinez, J.P. Greene, L.A. Gurgi, D.J. HartleyR. Ilieva, S. Ilieva, F.G. Kondev, T. Kroell, G.J. Lane, T. Lauritsen, I. Lazarus, G. Lotay, C.R. Nita, Zs. Podolyak, V. Pucknell, M. Reed, P.H. Regan, J. Rohrer, J. Sethi, D. Seweryniak, C.M. Shand, J. Simpson, M. Smolen, E. A. Stefanova, V. Vedia, O. Yordanov

^*Corresponding author for this work

School of Computing, Engineering and Physical Sciences

Research output: Contribution to journal › Article › peer-review

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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 R_B(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 R_B(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.

Original language	English
Article number	044309
Number of pages	10
Journal	Physical Review C
Volume	100
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.100.044309
Publication status	Published - 11 Oct 2019

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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., Carmona Gallardo, M., Carroll, R. J., Copp, P., Cullen, D. M., Daniel, T., Martinez, G. F., Greene, J. P., Gurgi, L. A., ... Yordanov, O. (2019). Fast-timing measurements in the ground-state band of ¹¹⁴Pd. Physical Review C, 100(4), [044309]. https://doi.org/10.1103/PhysRevC.100.044309

@article{c692135056774b5c9fc4854b6ff08ba8,

title = "Fast-timing measurements in the ground-state band of 114Pd",

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.",

author = "E.R. Gamba and A.M. Bruce and S. Lalkovski and M. Rudigier and S. Bottoni and M.P. Carpenter and S. Zhu and J.T. Anderson and A.D. Ayangeakaa and T.A. Berry and I. Burrows and {Carmona Gallardo}, M. and R.J. Carroll and P. Copp and D.M. Cullen and T. Daniel and Martinez, {G. Fernandez} and J.P. Greene and L.A. Gurgi and D.J. Hartley and R. Ilieva and S. Ilieva and F.G. Kondev and T. Kroell and G.J. Lane and T. Lauritsen and I. Lazarus and G. Lotay and C.R. Nita and Zs. Podolyak and V. Pucknell and M. Reed and P.H. Regan and J. Rohrer and J. Sethi and D. Seweryniak and C.M. Shand and J. Simpson and M. Smolen and Stefanova, {E. A.} and V. Vedia and O. Yordanov",

year = "2019",

month = oct,

day = "11",

doi = "10.1103/PhysRevC.100.044309",

language = "English",

volume = "100",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "4",

}

Gamba, ER, Bruce, AM, Lalkovski, S, Rudigier, M, Bottoni, S, Carpenter, MP, Zhu, S, Anderson, JT, Ayangeakaa, AD, Berry, TA, Burrows, I, Carmona Gallardo, M, Carroll, RJ, Copp, P, Cullen, DM, Daniel, T, Martinez, GF, Greene, JP, Gurgi, LA, Hartley, DJ, Ilieva, R, Ilieva, S, Kondev, FG, Kroell, T, Lane, GJ, Lauritsen, T, Lazarus, I, Lotay, G, Nita, CR, Podolyak, Z, Pucknell, V, Reed, M, Regan, PH, Rohrer, J, Sethi, J, Seweryniak, D, Shand, CM, Simpson, J, Smolen, M, Stefanova, EA, Vedia, V & Yordanov, O 2019, 'Fast-timing measurements in the ground-state band of ¹¹⁴Pd', Physical Review C, vol. 100, no. 4, 044309. https://doi.org/10.1103/PhysRevC.100.044309

TY - JOUR

T1 - Fast-timing measurements in the ground-state band of 114Pd

AU - Gamba, E.R.

AU - Bruce, A.M.

AU - Lalkovski, S.

AU - Rudigier, M.

AU - Bottoni, S.

AU - Carpenter, M.P.

AU - Zhu, S.

AU - Anderson, J.T.

AU - Ayangeakaa, A.D.

AU - Berry, T.A.

AU - Burrows, I.

AU - Carmona Gallardo, M.

AU - Carroll, R.J.

AU - Copp, P.

AU - Cullen, D.M.

AU - Daniel, T.

AU - Martinez, G. Fernandez

AU - Greene, J.P.

AU - Gurgi, L.A.

AU - Hartley, D.J.

AU - Ilieva, R.

AU - Ilieva, S.

AU - Kondev, F.G.

AU - Kroell, T.

AU - Lane, G.J.

AU - Lauritsen, T.

AU - Lazarus, I.

AU - Lotay, G.

AU - Nita, C.R.

AU - Podolyak, Zs.

AU - Pucknell, V.

AU - Reed, M.

AU - Regan, P.H.

AU - Rohrer, J.

AU - Sethi, J.

AU - Seweryniak, D.

AU - Shand, C.M.

AU - Simpson, J.

AU - Smolen, M.

AU - Stefanova, E. A.

AU - Vedia, V.

AU - Yordanov, O.

PY - 2019/10/11

Y1 - 2019/10/11

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevC.100.044309

DO - 10.1103/PhysRevC.100.044309

M3 - Article

SN - 2469-9985

VL - 100

JO - Physical Review C

JF - Physical Review C

IS - 4

M1 - 044309

ER -

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

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