Quadrupole and octupole collectivity in the semi-magic nucleus 20680Hg126

L. Morrison; K. Hadyńska-Klȩk; Zs. Podolyák; L.P. Gaffney; M. Zielińska; B.A. Brown; H. Grawe; P.D. Stevenson; T. Berry; A. Boukhari; M. Brunet; R. Canavan; R. Catherall; J. Cederkäll; S.J. Colosimo; J.G. Cubiss; H. De Witte; D.T. Doherty; Ch. Fransen; G. Georgiev; E. Giannopoulos; M. Górska; H. Hess; L. Kaya; T. Kröll; N. Lalović; B. Marsh; Y. Martinez Palenzuela; G. O'Neill; J. Pakarinen; J.P. Ramos; P. Reiter; J.A. Rodriguez; D. Rosiak; S. Rothe; M. Rudigier; M. Siciliano; E. C. Simpson; J. Snall; P. Spagnoletti; S. Thiel; N. Warr; F. Wenander; R. Zidarova

doi:10.1016/j.physletb.2023.137675

Quadrupole and octupole collectivity in the semi-magic nucleus ²⁰⁶₈₀Hg₁₂₆

L. Morrison, K. Hadyńska-Klȩk, Zs. Podolyák, L.P. Gaffney, M. Zielińska, B.A. Brown, H. Grawe, P.D. Stevenson, T. Berry, A. Boukhari, M. Brunet, R. Canavan, R. Catherall, J. Cederkäll, S.J. Colosimo, J.G. Cubiss, H. De Witte, D.T. Doherty, Ch. Fransen, G. GeorgievE. Giannopoulos, M. Górska, H. Hess, L. Kaya, T. Kröll, N. Lalović, B. Marsh, Y. Martinez Palenzuela, G. O'Neill, J. Pakarinen, J.P. Ramos, P. Reiter, J.A. Rodriguez, D. Rosiak, S. Rothe, M. Rudigier, M. Siciliano, E. C. Simpson, J. Snall, P. Spagnoletti, S. Thiel, N. Warr, F. Wenander, R. Zidarova

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

Abstract

The first low-energy Coulomb-excitation measurement of the radioactive, semi-magic, two proton-hole nucleus ²⁰⁶Hg, was performed at CERN's recently-commissioned HIE-ISOLDE facility. Two γ rays depopulating low-lying states in ²⁰⁶Hg were observed. From the data, a reduced transition strength B(E2; 2⁺₁ → 0⁺₁) = 4.4(6) W.u. was determined, the first such value for an N=126 nucleus south of ²⁰⁸Pb, which is found to be slightly lower than that predicted by shell-model calculations. In addition, a collective octupole state was identified at an excitation energy of 2705 keV, for which a reduced B(E3) transition probability of 30⁺¹⁰_-30 W.u. was extracted. These results are crucial for understanding both quadrupole and octupole collectivity in the vicinity of the heaviest doubly-magic nucleus ²⁰⁸Pb, and for benchmarking a number of theoretical approaches in this key region. This is of particular importance given the paucity of data on transition strengths in this region, which could be used, in principle, to test calculations relevant to the astrophysical r-process.

Original language	English
Article number	137675
Journal	Physics Letters B
Volume	838
Early online date	2023
DOIs	https://doi.org/10.1016/j.physletb.2023.137675
Publication status	Published - 2023

Subject classification (UKÄ)

Subatomic Physics

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Cite this

Morrison, L., Hadyńska-Klȩk, K., Podolyák, Z., Gaffney, L. P., Zielińska, M., Brown, B. A., Grawe, H., Stevenson, P. D., Berry, T., Boukhari, A., Brunet, M., Canavan, R., Catherall, R., Cederkäll, J., Colosimo, S. J., Cubiss, J. G., De Witte, H., Doherty, D. T., Fransen, C., ... Zidarova, R. (2023). Quadrupole and octupole collectivity in the semi-magic nucleus ²⁰⁶₈₀Hg₁₂₆. Physics Letters B, 838, Article 137675. https://doi.org/10.1016/j.physletb.2023.137675

@article{54d9eb8950704bd6898ca16725d0305d,

title = "Quadrupole and octupole collectivity in the semi-magic nucleus 20680Hg126",

abstract = "The first low-energy Coulomb-excitation measurement of the radioactive, semi-magic, two proton-hole nucleus 206Hg, was performed at CERN's recently-commissioned HIE-ISOLDE facility. Two γ rays depopulating low-lying states in 206Hg were observed. From the data, a reduced transition strength B(E2; 2+1 → 0+1) = 4.4(6) W.u. was determined, the first such value for an N=126 nucleus south of 208Pb, which is found to be slightly lower than that predicted by shell-model calculations. In addition, a collective octupole state was identified at an excitation energy of 2705 keV, for which a reduced B(E3) transition probability of 30+10-30 W.u. was extracted. These results are crucial for understanding both quadrupole and octupole collectivity in the vicinity of the heaviest doubly-magic nucleus 208Pb, and for benchmarking a number of theoretical approaches in this key region. This is of particular importance given the paucity of data on transition strengths in this region, which could be used, in principle, to test calculations relevant to the astrophysical r-process.",

author = "L. Morrison and K. Hady{\'n}ska-Klȩk and Zs. Podoly{\'a}k and L.P. Gaffney and M. Zieli{\'n}ska and B.A. Brown and H. Grawe and P.D. Stevenson and T. Berry and A. Boukhari and M. Brunet and R. Canavan and R. Catherall and J. Cederk{\"a}ll and S.J. Colosimo and J.G. Cubiss and {De Witte}, H. and D.T. Doherty and Ch. Fransen and G. Georgiev and E. Giannopoulos and M. G{\'o}rska and H. Hess and L. Kaya and T. Kr{\"o}ll and N. Lalovi{\'c} and B. Marsh and Palenzuela, {Y. Martinez} and G. O'Neill and J. Pakarinen and J.P. Ramos and P. Reiter and J.A. Rodriguez and D. Rosiak and S. Rothe and M. Rudigier and M. Siciliano and Simpson, {E. C.} and J. Snall and P. Spagnoletti and S. Thiel and N. Warr and F. Wenander and R. Zidarova",

year = "2023",

doi = "10.1016/j.physletb.2023.137675",

language = "English",

volume = "838",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

}

Morrison, L, Hadyńska-Klȩk, K, Podolyák, Z, Gaffney, LP, Zielińska, M, Brown, BA, Grawe, H, Stevenson, PD, Berry, T, Boukhari, A, Brunet, M, Canavan, R, Catherall, R, Cederkäll, J, Colosimo, SJ, Cubiss, JG, De Witte, H, Doherty, DT, Fransen, C, Georgiev, G, Giannopoulos, E, Górska, M, Hess, H, Kaya, L, Kröll, T, Lalović, N, Marsh, B, Palenzuela, YM, O'Neill, G, Pakarinen, J, Ramos, JP, Reiter, P, Rodriguez, JA, Rosiak, D, Rothe, S, Rudigier, M, Siciliano, M, Simpson, EC, Snall, J, Spagnoletti, P, Thiel, S, Warr, N, Wenander, F & Zidarova, R 2023, 'Quadrupole and octupole collectivity in the semi-magic nucleus ²⁰⁶₈₀Hg₁₂₆', Physics Letters B, vol. 838, 137675. https://doi.org/10.1016/j.physletb.2023.137675

TY - JOUR

T1 - Quadrupole and octupole collectivity in the semi-magic nucleus 20680Hg126

AU - Morrison, L.

AU - Hadyńska-Klȩk, K.

AU - Podolyák, Zs.

AU - Gaffney, L.P.

AU - Zielińska, M.

AU - Brown, B.A.

AU - Grawe, H.

AU - Stevenson, P.D.

AU - Berry, T.

AU - Boukhari, A.

AU - Brunet, M.

AU - Canavan, R.

AU - Catherall, R.

AU - Cederkäll, J.

AU - Colosimo, S.J.

AU - Cubiss, J.G.

AU - De Witte, H.

AU - Doherty, D.T.

AU - Fransen, Ch.

AU - Georgiev, G.

AU - Giannopoulos, E.

AU - Górska, M.

AU - Hess, H.

AU - Kaya, L.

AU - Kröll, T.

AU - Lalović, N.

AU - Marsh, B.

AU - Palenzuela, Y. Martinez

AU - O'Neill, G.

AU - Pakarinen, J.

AU - Ramos, J.P.

AU - Reiter, P.

AU - Rodriguez, J.A.

AU - Rosiak, D.

AU - Rothe, S.

AU - Rudigier, M.

AU - Siciliano, M.

AU - Simpson, E. C.

AU - Snall, J.

AU - Spagnoletti, P.

AU - Thiel, S.

AU - Warr, N.

AU - Wenander, F.

AU - Zidarova, R.

PY - 2023

Y1 - 2023

N2 - The first low-energy Coulomb-excitation measurement of the radioactive, semi-magic, two proton-hole nucleus 206Hg, was performed at CERN's recently-commissioned HIE-ISOLDE facility. Two γ rays depopulating low-lying states in 206Hg were observed. From the data, a reduced transition strength B(E2; 2+1 → 0+1) = 4.4(6) W.u. was determined, the first such value for an N=126 nucleus south of 208Pb, which is found to be slightly lower than that predicted by shell-model calculations. In addition, a collective octupole state was identified at an excitation energy of 2705 keV, for which a reduced B(E3) transition probability of 30+10-30 W.u. was extracted. These results are crucial for understanding both quadrupole and octupole collectivity in the vicinity of the heaviest doubly-magic nucleus 208Pb, and for benchmarking a number of theoretical approaches in this key region. This is of particular importance given the paucity of data on transition strengths in this region, which could be used, in principle, to test calculations relevant to the astrophysical r-process.

AB - The first low-energy Coulomb-excitation measurement of the radioactive, semi-magic, two proton-hole nucleus 206Hg, was performed at CERN's recently-commissioned HIE-ISOLDE facility. Two γ rays depopulating low-lying states in 206Hg were observed. From the data, a reduced transition strength B(E2; 2+1 → 0+1) = 4.4(6) W.u. was determined, the first such value for an N=126 nucleus south of 208Pb, which is found to be slightly lower than that predicted by shell-model calculations. In addition, a collective octupole state was identified at an excitation energy of 2705 keV, for which a reduced B(E3) transition probability of 30+10-30 W.u. was extracted. These results are crucial for understanding both quadrupole and octupole collectivity in the vicinity of the heaviest doubly-magic nucleus 208Pb, and for benchmarking a number of theoretical approaches in this key region. This is of particular importance given the paucity of data on transition strengths in this region, which could be used, in principle, to test calculations relevant to the astrophysical r-process.

U2 - 10.1016/j.physletb.2023.137675

DO - 10.1016/j.physletb.2023.137675

M3 - Article

SN - 0370-2693

VL - 838

JO - Physics Letters B

JF - Physics Letters B

M1 - 137675

ER -