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

Joonas Ojala; Janne Pakarinen; Philippos Papadakis; Juha Sorri; Mikael Sandzelius; Daniel M. Cox; Kalle Auranen; Hussam Badran; Paul J. Davies; Tuomas Grahn; Paul T. Greenlees; Jack Henderson; Andrej Herzáň; Rolf Dietmar Herzberg; Joshua Hilton; Ulrika Jakobsson; David G. Jenkins; David T. Joss; Rauno Julin; Sakari Juutinen; Tibor Kibédi; Joonas Konki; Gregory J. Lane; Matti Leino; Jarkko Liimatainen; Christopher G. McPeake; Olavi Neuvonen; Robert D. Page; Edward Parr; Jari Partanen; Pauli Peura; Panu Rahkila; John Revill; Panu Ruotsalainen; Jan Sarén; Catherine Scholey; Sanna Stolze; Juha Uusitalo; Andrew Ward; Robert Wadsworth

doi:10.1038/s42005-022-00990-4

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

Joonas Ojala, Janne Pakarinen^*, Philippos Papadakis, Juha Sorri, Mikael Sandzelius, Daniel M. Cox, Kalle Auranen, Hussam Badran, Paul J. Davies, Tuomas Grahn, Paul T. Greenlees, Jack Henderson, Andrej Herzáň, Rolf Dietmar Herzberg, Joshua Hilton, Ulrika Jakobsson, David G. Jenkins, David T. Joss, Rauno Julin, Sakari JuutinenTibor Kibédi, Joonas Konki, Gregory J. Lane, Matti Leino, Jarkko Liimatainen, Christopher G. McPeake, Olavi Neuvonen, Robert D. Page, Edward Parr, Jari Partanen, Pauli Peura, Panu Rahkila, John Revill, Panu Ruotsalainen, Jan Sarén, Catherine Scholey, Sanna Stolze, Juha Uusitalo, Andrew Ward, Robert Wadsworth

^*Corresponding author for this work

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

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 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.

Original language	English
Article number	213
Journal	Communications Physics
Volume	5
Issue number	1
DOIs	https://doi.org/10.1038/s42005-022-00990-4
Publication status	Published - 18 Aug 2022

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Reassigning the shapes of the 0+ states in the 186Pb nucleus
© The Author(s) 2022
Final published version, 1.58 MBLicence: CC BY

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Ojala, J., Pakarinen, J., Papadakis, P., Sorri, J., Sandzelius, M., Cox, D. M., Auranen, K., Badran, H., Davies, P. J., Grahn, T., Greenlees, P. T., Henderson, J., Herzáň, A., Herzberg, R. D., Hilton, J., Jakobsson, U., Jenkins, D. G., Joss, D. T., Julin, R., ... Wadsworth, R. (2022). Reassigning the shapes of the 0⁺ states in the ¹⁸⁶Pb nucleus. Communications Physics, 5(1), Article 213. https://doi.org/10.1038/s42005-022-00990-4

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title = "Reassigning the shapes of the 0+ states in the 186Pb nucleus",

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 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.",

author = "Joonas Ojala and Janne Pakarinen and Philippos Papadakis and Juha Sorri and Mikael Sandzelius and Cox, {Daniel M.} and Kalle Auranen and Hussam Badran and Davies, {Paul J.} and Tuomas Grahn and Greenlees, {Paul T.} and Jack Henderson and Andrej Herz{\'a}{\v n} and Herzberg, {Rolf Dietmar} and Joshua Hilton and Ulrika Jakobsson and Jenkins, {David G.} and Joss, {David T.} and Rauno Julin and Sakari Juutinen and Tibor Kib{\'e}di and Joonas Konki and Lane, {Gregory J.} and Matti Leino and Jarkko Liimatainen and McPeake, {Christopher G.} and Olavi Neuvonen and Page, {Robert D.} and Edward Parr and Jari Partanen and Pauli Peura and Panu Rahkila and John Revill and Panu Ruotsalainen and Jan Sar{\'e}n and Catherine Scholey and Sanna Stolze and Juha Uusitalo and Andrew Ward and Robert Wadsworth",

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month = aug,

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doi = "10.1038/s42005-022-00990-4",

language = "English",

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Ojala, J, Pakarinen, J, Papadakis, P, Sorri, J, Sandzelius, M, Cox, DM, Auranen, K, Badran, H, Davies, PJ, Grahn, T, Greenlees, PT, Henderson, J, Herzáň, A, Herzberg, RD, Hilton, J, Jakobsson, U, Jenkins, DG, Joss, DT, Julin, R, Juutinen, S, Kibédi, T, Konki, J, Lane, GJ, Leino, M, Liimatainen, J, McPeake, CG, Neuvonen, O, Page, RD, Parr, E, Partanen, J, Peura, P, Rahkila, P, Revill, J, Ruotsalainen, P, Sarén, J, Scholey, C, Stolze, S, Uusitalo, J, Ward, A & Wadsworth, R 2022, 'Reassigning the shapes of the 0⁺ states in the ¹⁸⁶Pb nucleus', Communications Physics, vol. 5, no. 1, 213. https://doi.org/10.1038/s42005-022-00990-4

TY - JOUR

T1 - Reassigning the shapes of the 0+ states in the 186Pb nucleus

AU - Ojala, Joonas

AU - Pakarinen, Janne

AU - Papadakis, Philippos

AU - Sorri, Juha

AU - Sandzelius, Mikael

AU - Cox, Daniel M.

AU - Auranen, Kalle

AU - Badran, Hussam

AU - Davies, Paul J.

AU - Grahn, Tuomas

AU - Greenlees, Paul T.

AU - Henderson, Jack

AU - Herzáň, Andrej

AU - Herzberg, Rolf Dietmar

AU - Hilton, Joshua

AU - Jakobsson, Ulrika

AU - Jenkins, David G.

AU - Joss, David T.

AU - Julin, Rauno

AU - Juutinen, Sakari

AU - Kibédi, Tibor

AU - Konki, Joonas

AU - Lane, Gregory J.

AU - Leino, Matti

AU - Liimatainen, Jarkko

AU - McPeake, Christopher G.

AU - Neuvonen, Olavi

AU - Page, Robert D.

AU - Parr, Edward

AU - Partanen, Jari

AU - Peura, Pauli

AU - Rahkila, Panu

AU - Revill, John

AU - Ruotsalainen, Panu

AU - Sarén, Jan

AU - Scholey, Catherine

AU - Stolze, Sanna

AU - Uusitalo, Juha

AU - Ward, Andrew

AU - Wadsworth, Robert

PY - 2022/8/18

Y1 - 2022/8/18

N2 - 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.

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

Abstract

Bibliographical note

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Nuclear Physics Consolidated Grant 2021-2024

Nuclear Physics Consolidated Grant

Nuclear Physics Consolidation Grant

Cite this

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

Abstract

Bibliographical note

Access to Document

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Projects

Nuclear Physics Consolidated Grant 2021-2024

Nuclear Physics Consolidated Grant

Nuclear Physics Consolidation Grant

Cite this

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