Reassigning the shapes of the 0+ states in the 186Pb nucleus
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, Article 213. https://doi.org/10.1038/s42005-022-00990-4
Julkaistu sarjassa
Communications physicsTekijät
Päivämäärä
2022Oppiaine
KiihdytinlaboratorioYdin- ja kiihdytinfysiikan huippuyksikköFysiikkaKiihdytinfysiikka ja subatomäärinen fysiikkaAccelerator LaboratoryCentre of Excellence in Nuclear and Accelerator Based PhysicsPhysicsAccelerator and Subatomic PhysicsTekijänoikeudet
© The Author(s) 2022
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 0+2 state and the interband 2+2→2+1 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;2+1→0+2) value of 190(80) W.u., the transitional quadrupole moment |Qt(2+1→0+2)|=7.7(33) eb and intensity balance arguments provide evidence to reassign the 0+2 and 0+3 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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Julkaisija
Springer Science and Business Media LLCISSN Hae Julkaisufoorumista
2399-3650Julkaisuun liittyvä(t) tutkimusaineisto(t)
https://doi.org/10.23729/a6444894-5fe7-4683-a9d5-a8ff1e28208bJulkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/151719305
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Suomen AkatemiaRahoitusohjelmat(t)
Akatemiatutkija, SALisätietoja rahoituksesta
This work has been supported through the Academy of Finland under the Finnish Centre of Excellence Programme 2012–2017 (Nuclear and Accelerator Based Physics Programme at JYFL), through the Academy Research Fellow funding (contract number 257562) and the European Gamma-Ray Spectroscopy pool. Support from the Science and Technology Facilities Council (UK) and EU 7th framework programme Integrating Activities - Transnational Access, Project No. 262010 (ENSAR) are acknowledged. AH would like to thank the Slovak Research and Development Agency under contract No. APVV-20-0532, and Slovak grant agency VEGA (contract No. 2/0067/21).![showless](/themes/JYX2//images/showless.png)
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