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Article
Title Reinterpretation of excited states in 212Po: Shell-model multiplets rather than α-cluster states
Author(s) Fernández, A (CSIC, Madrid) ; Jungclaus, A (CSIC, Madrid) ; Golubev, P (Lund U.) ; Rudolph, D (Lund U.) ; Sarmiento, L G (Lund U.) ; Gargano, A (INFN, Naples) ; Naïdja, H (Constantine U.) ; Astier, A (IJCLab, Orsay) ; Dupont, E (IJCLab, Orsay) ; Gadea, A (Valencia U., IFIC) ყველა 74 ავტორის ჩვენება
Publication 2021
Number of pages 19
In: Phys. Rev. C 104 (2021) 054316
DOI 10.1103/PhysRevC.104.054316 (publication)
Subject category Nuclear Physics - Theory
Accelerator/Facility, Experiment AGATA
Abstract A γ -ray spectroscopic study of 212Po was performed at the Grand Accélérateur National d’Ions Lourds, using the inverse kinematics α-transfer reaction 12C(208Pb, 212Po) 8Be and the AGATA spectrometer. A careful analysis based on γγ coincidence relations allowed us to establish 14 new excited states in the energy range between 1.9 and 3.3 MeV. None of these states, however, can be considered as candidates for the levels with spins and parities of 1 and 2 and excitation energies below 2.1 MeV, which have been predicted by recent αcluster model calculations. A systematic comparison of the experimentally established excitation scheme of 212Po with shell-model calculations was performed. This comparison suggests that the six states with excitation energies (spins and parities) of 1744 (4), 1751 (8), 1787 (6), 1946 (4), 1986 (8), and 2016 (6) keV, which previously were interpreted as α-cluster states, may in fact be of positive parity and belong to low-lying shell-model multiplets. This reinterpretation of the structure of 212Po is supported by experimental information with respect to the linear polarization of γ rays, which suggests a magnetic character of the 432-keV γ ray decaying from the state at an excitation energy of 1787 keV to the 61+ yrast state, and exclusive reaction cross sections.
Copyright/License publication: © 2021-2025 authors (License: CC BY 4.0)

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 ჩანაწერი შექმნილია 2021-12-15, ბოლოს შესწორებულია 2021-12-17


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