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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:38 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Theoretical Physics and Applied Mathematics
Title:
Systematics of the α-decay fine structure in even-even nuclei
Authors:
D. S. DELION (1,2,3), A. DUMITRESCU (1,4)
Affiliation:
1)”Horia Hulubei” National Institute of Physics and Nuclear Engineering, 407 Atomiștilor, POB MG-6, Bucharest-Măgurele, RO-077125, România
2)Academy of Romanian Scientists, 54 Splaiul Independentei, Bucharest, RO-050094, România
3)Bioterra University, 81 Gârlei str., Bucharest, RO-013724, România
4)Department of Physics, University of Bucharest, 405 Atomiștilor, POB MG-11, Bucharest-Măgurele, RO-077125, România
E-mail
alexandru.dumitrescu@theory.nipne.ro
Keywords:
nuclear structure, α-decay fine structure, coupled channels method
Abstract:
We describe α-decay transitions to low-lying states in even-even nuclei with Z > 50, N > 82 by using the Coherent State Model (CSM). We reproduce the energies and electromagnetic transitions of the ground state band by using two parameters, namely the deformation parameter and the strength of the harmonic CSM Hamiltonian. The B(E2) values are described in terms of an effective charge which depends linearly on the deformation parameter. The α-emission process is described by using an α-daughter interaction containing a monopole component, estimated within a double folding procedure with M3Y interaction plus a repulsive core simulating the Pauli principle, and a quadrupole-quadrupole (QQ) interaction. The decaying states are identified with the lowest narrow outgoing resonances obtained within the coupled channels method. The α-branching ratios to 2+ states were reproduced by using the QQ strength. This interaction strength can be fitted by a linear dependence versus the deformation parameter, as predicted by CSM. The theoretical intensities to 4+ and 6+ states are in a reasonable agreement with available experimental data.
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