109 citations · 579 across the 21 of their papers we have counts for
23 papers
Sensitivity of quasifission dynamics to the nuclear symmetry energy in Ca+Cf
C. Ross, R. Gumbel, K. Godbey +1
We present a systematic study of the sensitivity of quasifission dynamics to the nuclear symmetry energy in the Ca~+~Cf system, the reaction used for the synthesis o…
The advanced evolution of massive stars: I. New reaction rates for carbon and oxygen nuclear reactions
T. Dumont, A. Bonhomme, A. Griffiths +9
The nuclear rates for reactions involving 12C and 16O are key to compute the energy release and nucleosynthesis of massive stars during their evolution. These rates shape the stell…
Shell effects in quasi-fission for calcium induced reactions forming thorium isotopes
C. Simenel, A. S. Umar, K. Godbey +1
Quantum shell effects induce an asymmetric fission mode in actinides, which disappears in neutron deficient isotopes. Quasi-fission, characterized by a significant mass transfer in…
Impact of tensor forces on quasifission product yield distributions
Liang Li, Lu Guo, K. Godbey +1
We employ the microscopic time-dependent Hartree-Fock (TDHF) theory to study the 48Ca+249Bk and 48Ti+238U systems, taking into account the dependence on orientation for deformed nu…
Pauli energy contribution to nucleus-nucleus interaction
A. S. Umar, K. Godbey, C. Simenel
The investigation delves into understanding how the Pauli exclusion principle influences the bare potential between atomic nuclei through the application of advanced theoretical me…
Isospin composition of fission barriers
K. Godbey, C. Ross, A. S. Umar
We employ a microscopic method to study how isospin affect the fission potential of Pu. Our approach uses constrained Hartree-Fock theory (CHF) which allows us to separatel…
Cluster model of 12C in density functional theory framework
A. S. Umar, K. Godbey, C. Simenel
We employ the constrained density functional theory to investigate cluster phenomena for the C nucleus. The proton and neutron densities are generated from the placement of…
Impact of tensor force on quantum shell effects in quasifission reactions
Liang Li, Lu Guo, K. Godbey +1
Quantum shell effects drive many aspects of many-body quantal systems and their interactions. Among these are the quasifission reactions that impede the formation of a compound nuc…
Theoretical Uncertainty Quantification for Heavy-ion Fusion
K. Godbey, A. S. Umar, C. Simenel
Despite recent advances and focus on rigorous uncertainty quantification for microscopic models of quantum many-body systems, the uncertainty on the dynamics of those systems has b…
Fragment Intrinsic Spins and Fragments' Relative Orbital Angular Momentum in Nuclear Fission
Aurel Bulgac, Ibrahim Abdurrahman, Kyle Godbey +1
We present the first fully unrestricted microscopic calculations of the primary fission fragment intrinsic spins and of the fission fragments' relative orbital angular momentum for…
Comparison of fission and quasi-fission modes
C. Simenel, P. McGlynn, A. S. Umar +1
Quantum shell effects are known to affect the formation of fragments in nuclear fission. Shell effects also affect quasi-fission reactions occurring in heavy-ion collisions. System…
Pauli energy contribution to nucleus-nucleus interaction
A. S. Umar, C. Simenel, K. Godbey
Background: The Pauli exclusion principle plays a crucial role as a building block of many-body quantal systems comprised of fermions. It also induces a "Pauli repulsion" in the in…
Timescales of quantum equilibration, dissipation and fluctuation in nuclear collisions
C. Simenel, K. Godbey, A. S. Umar
Understanding the dynamics of equilibration processes in quantum systems as well as their interplay with dissipation and fluctuation is a major challenge in quantum many-body theor…
Quasifission dynamics in microscopic theories
K. Godbey, A. S. Umar
In the search for superheavy elements quasifission reactions represent one of the reaction pathways that curtail the formation of an evaporation residue. In addition to its importa…
Microscopic predictions for production of neutron rich nuclei in the reaction
K. Godbey, C. Simenel, A. S. Umar
Background: Production of neutron-rich nuclei is of vital importance to both understanding nuclear structure far from stability and to informing astrophysical models of the rapid n…
Influence of the tensor interaction on heavy-ion fusion cross sections
K. Godbey, Lu Guo, A. S. Umar
[Background] While the tensor interaction has been shown to significantly affect the nuclear structure of exotic nuclei, its influence on nuclear reactions has only recently been i…
Deformed shell effects in Ca+Bk quasifission fragments
K. Godbey, A. S. Umar, C. Simenel
Background: Quasifission is the main reaction channel hindering the formation of superheavy nuclei (SHN). Its understanding will help to optimize entrance channels for SHN studies.…
Absence of hindrance in microscopic C+C fusion study
K. Godbey, C. Simenel, A. S. Umar
Background: Studies of low-energy fusion of light nuclei are important in astrophysical modeling, with small variations in reaction rates having a large impact on nucleosynthesis y…
Equilibration dynamics and isospin effects in nuclear reactions
A. S. Umar, C. Simenel, K. Godbey
We discuss equilibration times and isospin effect for various quantities in low-energy heavy-ion reactions. These include equilibration of mass, isospin, and total kinetic energy (…
The influence of tensor force on the microscopic heavy-ion interaction potential
Lu Guo, K. Godbey, A. S. Umar
Background: The tensor interaction is known to play an important role in the nuclear structure studies of exotic nuclei. However, most microscopic studies of low-energy nuclear rea…
Effect of Pauli repulsion and transfer on fusion
C. Simenel, K. Godbey, A. S. Umar +4
The effect of the Pauli exclusion principle on the nucleus-nucleus bare potential is studied using a new density-constrained extension of the Frozen-Hartree-Fock (DCFHF) technique.…
How the Pauli exclusion principle affects fusion of atomic nuclei
C. Simenel, A. S. Umar, K. Godbey +2
The Pauli exclusion principle induces a repulsion between composite systems of identical fermions such as colliding atomic nuclei. Our goal is to study how heavy-ion fusion is impa…
Dependence of fusion on isospin dynamics
K. Godbey, A. S. Umar, C. Simenel
We introduce a new microscopic approach to calculate the dependence of fusion barriers and cross-sections on isospin dynamics. The method is based on the time-dependent Hartree-Foc…