Journal
COMMUNICATIONS PHYSICS
Volume 5, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s42005-022-00990-4
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Funding
- Academy of Finland [257562]
- European Gamma-Ray Spectroscopy pool
- Science and Technology Facilities Council (UK)
- EU 7th framework programme Integrating Activities - Transnational Access [262010]
- Slovak Research and Development Agency [APVV-20-0532]
- Slovak grant agency VEGA [2/0067/21]
- Academy of Finland (AKA) [257562, 257562] Funding Source: Academy of Finland (AKA)
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The Pb-186 nucleus has been found to have three excited states with different shapes, and precision measurements have been conducted. These measurements are of great importance for the development of next-generation energy density functional models.
Across the physics disciplines, the Pb-186 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 Pb-186 were determined in a simultaneous in-beam gamma-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 vertical bar Q(t)(2(1)(+) -> 0(2)(+))vertical bar = 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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