Nuclear Theory·nucl-th

Friday·April 11, 2025

10 papers—5 primary·5 cross-listed

01
[Submitted on 10 Apr 2025]
Microscopic model for yields and total kinetic energy in nuclear fission
B. Li · D. Vretenar · T. Nikšić · P. W. Zhao · J. Meng
An extension of time-dependent density functional theory (TDDFT), the generalized time-dependent generator coordinate method (TDGCM), is applied to a study of induced nuclear fission dynamics. In the generalized TDGCM, the correlated nuclear wave function is represented as a coherent superposition of time-dependent DFT trajectories. In the first realistic application, a large basis of 25 TDDFT trajectories is employed to calculate the charge yields and total kinetic energy distribution for the fission of $^{240}$ Pu. The results are compared with available data, and with those obtained using a standard TDDFT, that does not consider quantum fluctuations, and the adiabatic TDGCM+GOA (Gaussian overlap approximation). It is shown that fragment yields and kinetic energies can simultaneously be described in a consistent microscopic framework that includes fluctuations in the collective degrees of freedom and the one-body dissipation mechanism.
Comments:
25 pages, 5 figures. arXiv admin note: text overlap with arXiv:2309.12564
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2504.07487 [pdf]
PRC(2025)·14 citations
02
[Submitted on 10 Apr 2025]
Excitation energies of $2_{1}^{+}$ and $4_{1}^{+}$ states of neutron deficient U and Pu isotopes
L.A. Malov · N.Yu. Shirikova · R.V. Jolos · E.A. Kolganova
The microscopic variant of the Grodzins relation and the Quasiparticle Phonon Model are applied to predict the excitation energies of the $2_{1}^{+}$ states of neutron deficient U and Pu isotopes. The P-factor systematics is used to determine the quadrupole deformation of nuclei under consideration. The excitation energies of the $4_{1}^{+}$ states are predicted based on the simple universal anharmonic vibrator type relation.
Comments:
5 pages
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2504.07564 [pdf]
IJMPE(2024)·0 citations
03
[Submitted on 10 Apr 2025]
Simultaneous calculation of elastic scattering, transfer, breakup, and other direct cross sections for $d$ + $^{197}$ Au reaction
H. M. Maridi · D. K. Sharp · J. Lubian
Simultaneous analyses are performed for cross section of elastic scattering, Coulomb breakup, transfer, and other direct yields for the $d$ + $^{197}$ Au system at all available energies. The data are reproduced well by the optical model that is based on parts related to the Coulomb and nuclear contributions of the direct cross sections. This method of calculation can be successfully applied to the reactions of deuteron with heavy targets.
Comments:
4 pages, 2 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2504.07648 [pdf]
NPA(2025)·0 citations
04
[Submitted on 10 Apr 2025]
Radiative $α$ capture on $^{12}$ C in cluster effective field theory: short review
Shung-Ichi Ando
Study of radiative $α$ capture on $^{12}$ C, $^{12}$ C( $α$ , $γ$ ) $^{16}$ O, in cluster effective field theory (EFT) is reviewed. A low energy EFT for $^{12}$ C( $α$ , $γ$ ) $^{16}$ O at the Gamow-peak energy, $E_{G} = 0.3$ ~MeV, is constructed, and the theory is first applied to the study of elastic $α$ - $^{12}$ C scattering at low energies. The effective range parameters are fitted to the precise phase shift data of the elastic scattering and the astrophysical $S_{E 1}$ factor of the $E 1$ transition of $^{12}$ C( $α$ , $γ$ ) $^{16}$ O at $E_{G}$ is estimated. For the study of the $E 2$ transition of $^{12}$ C( $α$ , $γ$ ) $^{16}$ O, we discuss a difficulty to determine the asymptotic normalization coefficient (ANC) of the subthreshold $2_{1}^{+}$ state of $^{16}$ O from the elastic scattering data, and demonstrate the difficulty with the estimate of the astrophysical $S_{E 2}$ factor of $^{12}$ C( $α$ , $γ$ ) $^{16}$ O at $E_{G}$ . We discuss the uncertainty in the estimate of the $S$ factors at $E_{G}$ in the present approach.
Comments:
9 pages, 4 figures, contribution to NN2024, version accepted for publication in Nucl. Phys. A
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2504.07767 [pdf]
NPA(2025)·3 citations
05
[Submitted on 10 Apr 2025]
Symmetry energy dependence of the bulk viscosity of nuclear matter
Yumu Yang🇺🇸 · Mauricio Hippert🇧🇷 · Enrico Speranza🇨🇭 · Jorge Noronha🇺🇸
We clarify how the weak-interaction-driven bulk viscosity $ζ$ and the bulk relaxation time $τ_{Π}$ of neutrino-transparent $n p e$ matter depend on the nuclear symmetry energy. We show that, at saturation density, the equation-of-state dependence of these transport quantities is fully determined by the experimentally constrained nuclear symmetry energy $S$ and its slope $L$ . Variations of $L$ can change the bulk viscosity by orders of magnitude, which can affect both the dissipative and the conservative tidal response of neutron stars. This suggests that both conservative and dissipative effects encoded in the gravitational-wave signatures of binary neutron star inspirals may help constrain nuclear symmetry energy properties.
Comments:
15 pages, 3 figures, appendices revised, version accepted for publication in Physical Review Letters
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc)
arXiv:
2504.07805 [pdf]
PRL(2025)·12 citations

Affiliations

first authorsco-authorsvia INSPIRE

Microscopic model for yields and total kinetic energy in nuclear fission

Excitation energies of 21+​ and 41+​ states of neutron deficient U and Pu isotopes

Simultaneous calculation of elastic scattering, transfer, breakup, and other direct cross sections for d+197Au reaction

Radiative α capture on 12C in cluster effective field theory: short review

Symmetry energy dependence of the bulk viscosity of nuclear matter

Affiliations

Excitation energies of $2_{1}^{+}$ and $4_{1}^{+}$ states of neutron deficient U and Pu isotopes

Simultaneous calculation of elastic scattering, transfer, breakup, and other direct cross sections for $d$ + $^{197}$ Au reaction

Radiative $α$ capture on $^{12}$ C in cluster effective field theory: short review