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

Morrison, L. ; Hadyńska-Klȩk, K. ; Podolyák, Zs. ; Gaffney, L.P. ; Zielińska, M. ; Brown, B.A. ; Grawe, H. ; Stevenson, P.D. ; Berry, T. and Boukhari, A. , et al. (2023) In Physics Letters B 838.
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... (More)
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. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physics Letters B
volume
838
article number
137675
publisher
Elsevier
external identifiers
  • scopus:85146728684
ISSN
0370-2693
DOI
10.1016/j.physletb.2023.137675
language
English
LU publication?
yes
id
54d9eb89-5070-4bd6-898c-a16725d0305d
date added to LUP
2023-01-17 15:10:41
date last changed
2023-02-10 14:32:08
@article{54d9eb89-5070-4bd6-898c-a16725d0305d,
  abstract     = {{The first low-energy Coulomb-excitation measurement of the radioactive, semi-magic, two proton-hole nucleus <sup>206</sup>Hg, was performed at CERN's recently-commissioned HIE-ISOLDE facility. Two <em>γ</em> rays depopulating low-lying states in <sup>206</sup>Hg were observed. From the data, a reduced transition strength <i>B</i>(<i>E</i>2; 2<sup>+</sup><sub>1</sub> → 0<sup>+</sup><sub>1</sub>) = 4.4(6) W.u. was determined, the first such value for an <i>N</i>=126 nucleus south of <sup>208</sup>Pb,<br>
 which is found to be slightly lower than that predicted by shell-model <br>
calculations. In addition, a collective octupole state was identified at<br>
 an excitation energy of 2705 keV, for which a reduced <i>B</i>(<i>E</i>3) transition probability of 30<sup>+10</sup><sub>-30</sub> W.u. was extracted. These results are crucial for understanding both <br>
quadrupole and octupole collectivity in the vicinity of the heaviest <br>
doubly-magic nucleus <sup>208</sup>Pb, and for benchmarking a number of <br>
theoretical approaches in this key region. This is of particular <br>
importance given the paucity of data on transition strengths in this <br>
region, which could be used, in principle, to test calculations relevant<br>
 to the astrophysical <em>r</em>-process.}},
  author       = {{Morrison, L. and Hadyńska-Klȩk, K. and Podolyák, Zs. and Gaffney, L.P. and Zielińska, M. and Brown, B.A. and Grawe, H. and Stevenson, P.D. and Berry, T. and Boukhari, A. and Brunet, M. and Canavan, R. and Catherall, R. and Cederkäll, J. and Colosimo, S.J. and Cubiss, J.G. and De Witte, H. and Doherty, D.T. and Fransen, Ch. and Georgiev, G. and Giannopoulos, E. and Górska, M. and Hess, H. and Kaya, L. and Kröll, T. and Lalović, N. and Marsh, B. and Palenzuela, Y. Martinez and O'Neill, G. and Pakarinen, J. and Ramos, J.P. and Reiter, P. and Rodriguez, J.A. and Rosiak, D. and Rothe, S. and Rudigier, M. and Siciliano, M. and Simpson, E. C. and Snall, J. and Spagnoletti, P. and Thiel, S. and Warr, N. and Wenander, F. and Zidarova, R.}},
  issn         = {{0370-2693}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters B}},
  title        = {{Quadrupole and octupole collectivity in the semi-magic nucleus <sup>206</sup><sub>80</sub>Hg<sub>126</sub>}},
  url          = {{http://dx.doi.org/10.1016/j.physletb.2023.137675}},
  doi          = {{10.1016/j.physletb.2023.137675}},
  volume       = {{838}},
  year         = {{2023}},
}