Nuclear Theory·nucl-th

Thursday·August 10, 2023

10 papers—3 primary·7 cross-listed

01
Simulation of the 2E Technique on neutron multiplicity measurement as a function of fragment mass in spontaneous fission of 252Cf
Modesto Montoya
A Monte Carlo simulation algorithm to investigate the measurement of the average prompt neutron multiplicity as a function of pre-neutron mass, for fragments from the spontaneous fission of 252Cf is presented. The input data consist of experimental measurements of the kinetic energy and mass distributions obtained by Gook et al. and the values calculated using the FIFRELIN model by Piau et al. We analyze the output curve obtained by simulation of the 2E technique, which should ideally match the theoretical curve. However, we find that the simulated as experiential curve exhibits a maximum value at A=122, close to mass symmetry, while the pre-neutron curve has a maximum at A=118. Additionally, we observe that que the simulated as pre neutron values are higher than the theoretical values for A<90 and A>162, respectively. We attribute this discrepancy to inaccuracies in the relationship between provisional mass and the pre-neutron mass used in the 2E technique for data processing in each fission event.
nucl-thnucl-exRev.Mex.Fis.(2024)·0 citations
02
Beyond-mean-field description of octupolarity in dysprosium isotopes with the Gogny-D1M energy density functional
R. Rodriguez-Guzman · L. M. Robledo
The emergence and stability of (static) octupole deformation effects in Dy isotopes from dripline to dripline ( $72 \leq N \leq 142$ ) is analyzed in this paper using mean-field and beyond-mean-field techniques often used for this purpose. We find static octupole deformations at the Hartree-Fock-Bogoliubov (HFB) level with the Gogny D1M force for $N \approx 134$ isotopes, while nuclei with $N \approx 88$ exhibit reflection-symmetric ground states. It is shown that, given the softness found in the mean-field and parity-projected potential energy surfaces along the octupole direction, neither of these two levels of approximation is suficcient to extract conclusions about the (permanent and/or vibrational) nature of octupole dynamic in Dy isotopes. From the analysis of the collective wave functions as well as the excitation energies of the first negative-parity states and $B (E 3)$ strengths, obtained within the framework of a two-dimensional symmetry-conserving generator coordinate method (2D-GCM), it is concluded that the increased octupole collectivity in Dy isotopes with $N \approx 88$ and $N \approx 134$ is a vibrational-like effect that is not directly related to permanent mean-field octupole deformation in the considered nuclei. A pronounced suppression of the $B (E 1)$ strengths is predicted for isotopes with $N \approx 82$ and $N \approx 126$ . The comparison of results obtained with other parametrizations, show the robustness of the predicted trends with respect to the underlying Gogny energy density functional.
nucl-thPRC(2023)·11 citations
03
A novel approach to light cluster production in heavy-ion collisions
Hui-Gan Cheng🇨🇳 · Zhao-Qing Feng🇨🇳
The issue of cluster production in heavy-ion collisions is addressed in a new manner, by implementing cluster correlation into the quantum molecular dynamics (QMD) transport model. We demonstrate for the first time, the good potentialities of this popular transport approach in the description of light cluster production including the deuteron, triton, $^{3}$ He and $α$ particle in heavy-ion collisions at intermediate energies. Both the INDRA and FOPI experimental data of the total multiplicities of light clusters and the charge distributions of heavier fragments are reasonably reproduced by the unified approach. The effects of both the cluster binding energies and the pauli repulsion are also shown to play crucial roles in the production of clusters.
nucl-thPRC(2024)·12 citations

Affiliations

first authorsco-authorsvia INSPIRE

Simulation of the 2E Technique on neutron multiplicity measurement as a function of fragment mass in spontaneous fission of 252Cf

Beyond-mean-field description of octupolarity in dysprosium isotopes with the Gogny-D1M energy density functional

A novel approach to light cluster production in heavy-ion collisions

Affiliations