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Reassigning the shapes of the 0+ states in the 186Pb nucleus (2022)

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

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Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajatOjala, Joonas; Pakarinen, Janne; Papadakis, Philippos; Sorri, Juha; Sandzelius, Mikael; Cox, Daniel M.; Auranen, Kalle; Badran, Hussam; Davies, Paul J.; Grahn, Tuomas; et al.

Lehti tai sarjaCommunications physics






KustantajaSpringer Science and Business Media LLC


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Linkki tutkimusaineistoonhttps://doi.org/10.23729/a6444894-5fe7-4683-a9d5-a8ff1e28208b

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Julkaisu on rinnakkaistallennettu (JYX)https://jyx.jyu.fi/handle/123456789/82751


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.


Vapaat asiasanatexperimental nuclear physics; physics

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Viimeisin päivitys 2024-03-04 klo 18:56