Pregled bibliografske jedinice broj: 1043085
Microscopic self-consistent description of induced fission dynamics: Finite-temperature effects
Microscopic self-consistent description of induced fission dynamics: Finite-temperature effects // Physical review. C, 99 (2019), 1; 014618, 8 doi:10.1103/physrevc.99.014618 (međunarodna recenzija, članak, znanstveni)
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Naslov
Microscopic self-consistent description of induced
fission dynamics: Finite-temperature effects
Autori
Zhao, Jie ; Nikšić, Tamara ; Vretenar, Dario ; Zhou, Shan-Gui
Izvornik
Physical review. C (2469-9985) 99
(2019), 1;
014618, 8
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
induced fission ; nuclear energy density functional ; finite temperature
Sažetak
The dynamics of induced fission of 226Th is investigated in a theoretical framework based on the finite-temperature time-dependent generator coordinate method (TDGCM) in the Gaussian overlap approximation (GOA). The thermodynamical collective potential and inertia tensor at temperatures in the interval T=0–1.25 MeV are calculated using the self- consistent multidimensionally constrained relativistic mean-field (MDC-RMF) model, based on the energy density functional DD-PC1. Pairing correlations are treated in the BCS approximation with a separable pairing force of finite range. Constrained RMF+BCS calculations are carried out in the collective space of axially symmetric quadrupole and octupole deformations for the asymmetric fissioning nucleus 226Th. The collective Hamiltonian is determined by the temperature-dependent free energy surface and perturbative cranking inertia tensor, and the TDGCM+GOA is used to propagate the initial collective state in time. The resulting charge and mass fragment distributions are analyzed as functions of the internal excitation energy. The model can qualitatively reproduce the empirical triple-humped structure of the fission charge and mass distributions already at T=0, but the precise experimental position of the asymmetric peaks and the symmetric-fission yield can only be accurately reproduced when the potential and inertia tensor of the collective Hamiltonian are determined at finite temperature, in this particular case between T=0.75 MeV and T=1 MeV.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
POVEZANOST RADA
Projekti:
--KK.01.1.1.01.0004 - Provedba vrhunskih istraživanja u sklopu Znanstvenog centra izvrsnosti za kvantne i kompleksne sustave te reprezentacije Liejevih algebri (QuantiXLie) (Buljan, Hrvoje; Pandžić, Pavle) ( CroRIS)
Ustanove:
Prirodoslovno-matematički fakultet, Zagreb
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus