التفاصيل البيبلوغرافية
| العنوان: |
Reassigning the shapes of the 0+ states in the 186Pb nucleus. |
| المؤلفون: |
Ojala, Joonas, Pakarinen, Janne, Papadakis, Philippos, Sorri, Juha, Sandzelius, Mikael, Cox, Daniel M., Auranen, Kalle, Badran, Hussam, Davies, Paul J., Grahn, Tuomas, Greenlees, Paul T., Henderson, Jack, Herzáň, Andrej, Herzberg, Rolf-Dietmar, Hilton, Joshua, Jakobsson, Ulrika, Jenkins, David G., Joss, David T., Julin, Rauno, Juutinen, Sakari |
| المصدر: |
Communications Physics; 8/18/2022, Vol. 5 Issue 1, p1-9, 9p |
| مصطلحات موضوعية: |
EXCITED states, ELECTRIC measurements, ELECTRON spectroscopy, QUADRUPOLE moments, ENERGY development |
| مستخلص: |
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 (E 2 ; 2 1 + → 0 2 + ) value of 190(80) W.u., the transitional quadrupole moment ∣ Q t ( 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. The authors study an interesting phenomena of shape coexistence in 186Pb. In an elegant and well-documented experiment, they confirm the coexistence of the three 0+ states in the 186Pb nucleus and reassign the shapes associated with the excited 0+ states. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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