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Reassigning the shapes of the 0+ states in the 186Pb nucleus

Ojala, Joonas ; Pakarinen, Janne ; Papadakis, Philippos ; Sorri, Juha ; Sandzelius, Mikael ; Cox, Daniel M. LU ; Auranen, Kalle ; Badran, Hussam ; Davies, Paul J. and Grahn, Tuomas , et al. (2022) In Communications Physics 5(1).
Abstract

Across the physics disciplines, the 186Pb nucleus is the only known system, where the two first excited states, together with the ground state, form a triplet of zero-spin states assigned with prolate, oblate and spherical shapes. Here we report on a precision measurement where the properties of collective transitions in 186Pb were determined in a simultaneous in-beam γ-ray and electron spectroscopy experiment employing the recoil-decay tagging technique. The feeding of the 02+ state and the interband 22+→21+ transition have been observed. We also present direct measurement of the energies of the electric monopole transitions from the excited 0+ states to the 0+ ground state. In contrast to... (More)

Across the physics disciplines, the 186Pb nucleus is the only known system, where the two first excited states, together with the ground state, form a triplet of zero-spin states assigned with prolate, oblate and spherical shapes. Here we report on a precision measurement where the properties of collective transitions in 186Pb were determined in a simultaneous in-beam γ-ray and electron spectroscopy experiment employing the recoil-decay tagging technique. The feeding of the 02+ state and the interband 22+→21+ transition have been observed. We also present direct measurement of the energies of the electric monopole transitions from the excited 0+ states to the 0+ ground state. In contrast to the earlier understanding, the obtained reduced transition probability B(E2;21+→02+) value of 190(80) W.u., the transitional quadrupole moment ∣Qt(21+→02+)∣=7.7(33) eb and intensity balance arguments provide evidence to reassign the 02+ and 03+ states with predominantly prolate and oblate shape, respectively. Our work demonstrates a step-up in experimental sensitivity and paves the way for systematic studies of electric monopole transitions in this region. These electric monopole transitions probe the nuclear volume in a unique manner and provide unexploited input for development of the next-generation energy density functional models.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Communications Physics
volume
5
issue
1
article number
213
publisher
Nature Publishing Group
external identifiers
  • scopus:85136509203
ISSN
2399-3650
DOI
10.1038/s42005-022-00990-4
language
English
LU publication?
yes
id
9f8fd47e-4bcc-4679-9299-4eb52f5ba770
date added to LUP
2022-12-30 09:00:17
date last changed
2022-12-30 09:00:17
@article{9f8fd47e-4bcc-4679-9299-4eb52f5ba770,
  abstract     = {{<p>Across the physics disciplines, the <sup>186</sup>Pb nucleus is the only known system, where the two first excited states, together with the ground state, form a triplet of zero-spin states assigned with prolate, oblate and spherical shapes. Here we report on a precision measurement where the properties of collective transitions in <sup>186</sup>Pb were determined in a simultaneous in-beam γ-ray and electron spectroscopy experiment employing the recoil-decay tagging technique. The feeding of the 02+ state and the interband 22+→21+ transition have been observed. We also present direct measurement of the energies of the electric monopole transitions from the excited 0<sup>+</sup> states to the 0<sup>+</sup> ground state. In contrast to the earlier understanding, the obtained reduced transition probability B(E2;21+→02+) value of 190(80) W.u., the transitional quadrupole moment ∣Qt(21+→02+)∣=7.7(33) eb and intensity balance arguments provide evidence to reassign the 02+ and 03+ states with predominantly prolate and oblate shape, respectively. Our work demonstrates a step-up in experimental sensitivity and paves the way for systematic studies of electric monopole transitions in this region. These electric monopole transitions probe the nuclear volume in a unique manner and provide unexploited input for development of the next-generation energy density functional models.</p>}},
  author       = {{Ojala, Joonas and Pakarinen, Janne and Papadakis, Philippos and Sorri, Juha and Sandzelius, Mikael and Cox, Daniel M. and Auranen, Kalle and Badran, Hussam and Davies, Paul J. and Grahn, Tuomas and Greenlees, Paul T. and Henderson, Jack and Herzáň, Andrej and Herzberg, Rolf Dietmar and Hilton, Joshua and Jakobsson, Ulrika and Jenkins, David G. and Joss, David T. and Julin, Rauno and Juutinen, Sakari and Kibédi, Tibor and Konki, Joonas and Lane, Gregory J. and Leino, Matti and Liimatainen, Jarkko and McPeake, Christopher G. and Neuvonen, Olavi and Page, Robert D. and Parr, Edward and Partanen, Jari and Peura, Pauli and Rahkila, Panu and Revill, John and Ruotsalainen, Panu and Sarén, Jan and Scholey, Catherine and Stolze, Sanna and Uusitalo, Juha and Ward, Andrew and Wadsworth, Robert}},
  issn         = {{2399-3650}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Communications Physics}},
  title        = {{Reassigning the shapes of the 0<sup>+</sup> states in the <sup>186</sup>Pb nucleus}},
  url          = {{http://dx.doi.org/10.1038/s42005-022-00990-4}},
  doi          = {{10.1038/s42005-022-00990-4}},
  volume       = {{5}},
  year         = {{2022}},
}