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NSR database version of April 11, 2024.

Search: Author = V.E.Oberacker

Found 54 matches.

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2016RE07      Phys.Rev. C 93, 044618 (2016)

P.-G.Reinhard, A.S.Umar, P.D.Stevenson, J.Piekarewicz, V.E.Oberacker, J.A.Maruhn

Sensitivity of the fusion cross section to the density dependence of the symmetry energy

NUCLEAR REACTIONS 48Ca(48Ca, X)96Zr*, E(cm)=45-65 MeV; calculated folding model ion-ion interaction potentials, fusion σ(E). Impact of nuclear fusion on the nuclear equation of state (EOS). 48Ca; calculated Neutron root-mean-square radius (rms), neutron diffraction radius, and neutron halo. Dynamic microscopic method based on density-constrained time-dependent Hartree-Fock (DC-TDHF) approach, and direct TDHF study of barrier cross sections using a family of Skyrme parametrization.

doi: 10.1103/PhysRevC.93.044618
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2016UM04      Phys.Rev. C 94, 024605 (2016)

A.S.Umar, V.E.Oberacker, C.Simenel

Fusion and quasifission dynamics in the reactions 48Ca + 249Bk and 50Ti + 249Bk using a time-dependent Hartree-Fock approach

NUCLEAR REACTIONS 249Bk(48Ca, X), E(cm)=211, 218, 193-230 MeV; 249Bk(50Ti, X), E(cm)=233.2, 205-245 MeV; calculated contact time, mass and charge of the light fragment, and excitation energies of the heavy and light fragments as function of incident energy, mass-angle and mass-TKE distributions. Unrestricted time-dependent Hartree-Fock (TDHF) calculations, and the density-constrained TDHF method to extract NN potentials and excitation energy in each fragment. Relevance to the production of Z=117 and 119 superheavy elements, and fusion and quasifission processes.

doi: 10.1103/PhysRevC.94.024605
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2015HA12      Phys.Rev. C 91, 041602 (2015)

K.Hammerton, Z.Kohley, D.J.Hinde, M.Dasgupta, A.Wakhle, E.Williams, V.E.Oberacker, A.S.Umar, I.P.Carter, K.J.Cook, J.Greene, D.Y.Jeung, D.H.Luong, S.D.McNeil, C.S.Palshetkar, D.C.Rafferty, C.Simenel, K.Stiefel

Reduced quasifission competition in fusion reactions forming neutron-rich heavy elements

NUCLEAR REACTIONS 180W(50Cr, X), E(cm)=222.6 MeV; 180W(52Cr, X), E(cm)=221.2 MeV; 180W(54Cr, X), E(cm)=219.8 MeV; 186W(50Cr, X), E(cm)=221.0 MeV; 184W(52Cr, X), E(cm)=220.1 MeV; 182W(54Cr, X), E(cm)=221.0 MeV; 184W(54Cr, X), E(cm)=218.9 MeV; 186W(54Cr, X), E(cm)=218.3 MeV; measured spectra of neutron-rich fragments from fusion-fission and quasifission in coincidence mode, mass-angle distributions (MADs) using the ANU CUBE detector system at ANU's Heavy-Ion Accelerator Facility; deduced strong dependence on the N/Z of the compound system in quasifission system. Comparison with microscopic time-dependent Hartree-Fock calculations of the quasifission process.

doi: 10.1103/PhysRevC.91.041602
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2015UM02      Phys.Rev. C 92, 024621 (2015)

A.S.Umar, V.E.Oberacker, C.Simenel

Shape evolution and collective dynamics of quasifission in the time-dependent Hartree-Fock approach

NUCLEAR REACTIONS 238U(40Ca, X), E(cm)=211 MeV; 249Bk(48Ca, X), E(cm)=218 MeV; 238U(48Ca, X), E(cm)=203 MeV; calculated effect of moment of inertia on the angular distribution of the fragments, contour plot of the time evolution of the mass density for 249Bk+48Ca reaction, time dependence on the moments inertia, impact parameter and temperature using fully microscopic time-dependent Hartee-Fock (TDHF) approach.

doi: 10.1103/PhysRevC.92.024621
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2015UM03      Phys.Rev. C 92, 025808 (2015)

A.S.Umar, V.E.Oberacker, C.J.Horowitz, P.-G.Reinhard, J.A.Maruhn

Swelling of nuclei embedded in neutron-gas and consequences for fusion

NUCLEAR REACTIONS 28O(28O, X), E(cm)=2-14 MeV; 60Ca(60Ca, X), E(cm)=34-58 MeV; calculated pycnonuclear fusion cross sections and Astrophysical S factor as a function of external neutron-gas density, up to 500 neutrons for 28O and 1040 for 60Ca using Sao Paulo potential and incoming wave boundary condition (IWBC) method. Relevance to study of fusion of neutron rich nuclei at radioactive ion beam facilities, and to the study of composition and heating of the crust of accreting neutron stars.

doi: 10.1103/PhysRevC.92.025808
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2015UM04      Nucl.Phys. A944, 238 (2015)

A.S.Umar, V.E.Oberacker

Time-dependent HF approach to SHE dynamics

NUCLEAR REACTIONS 238U(48Ca, x), E(cm)=185-250 MeV; calculated potential barrier for different mutual orientation of colliding nuclei, capture σ, deformation time dependence, inertia moment time dependence, light fragment charge and mass. 186W(54Cr, x), E=218.6 MeV;238U(40Ca, x), E(cm)=208-220 MeV; calculated quasifission time development for different mutual orientation of colliding nuclei, deformation, TKE, orientation angle between the nuclei, mass and charge differences, moment of inertia. DC-TDHF (Density Constrained TDHF). Compared with available data.

doi: 10.1016/j.nuclphysa.2015.02.011
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2014OB06      Phys.Rev. C 90, 054605 (2014)

V.E.Oberacker, A.S.Umar, C.Simenel

Dissipative dynamics in quasifission

NUCLEAR REACTIONS 238U(40Ca, X), (48Ca, X), E(cm)=209 MeV; calculated contact time, mass and charge of light fragment as function of impact parameter, total kinetic energy (TKE) of the quasifission (QF) fragments. Evidence of less QF in 48Ca+238U system than in 40Ca+238U, relevance to formation of superheavy elements (SHE). Discussed the effect due to magicity of 48Ca. TDHF calculations with Skyrme SLy4d energy density functional (EDF).

doi: 10.1103/PhysRevC.90.054605
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2014ST22      Phys.Rev. C 90, 041603 (2014)

T.K.Steinbach, J.Vadas, J.Schmidt, C.Haycraft, S.Hudan, R.T.deSouza, L.T.Baby, S.A.Kuvin, I.Wiedenhover, A.S.Umar, V.E.Oberacker

Sub-barrier enhancement of fusion as compared to a microscopic method in 18O + 12C

NUCLEAR REACTIONS 12C(18O, X), E=16.25, 36 MeV; measured fragment spectra, fusion σ(E) in sub-barrier domain, time-of-flight (TOF) technique at FSU tandem accelerator facility. Pulsed beam. Comparison with previous experimental results, and with density-constrained time-dependent Hartree-Fock (DC-TDHF) and coupled channel calculations.

doi: 10.1103/PhysRevC.90.041603
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2142.


2014UM01      Phys.Rev. C 89, 034611 (2014)

A.S.Umar, C.Simenel, V.E.Oberacker

Energy dependence of potential barriers and its effect on fusion cross sections

NUCLEAR REACTIONS 40Ca(40Ca, X), E(cm)=50, 53, 60, 65 MeV; 208Pb(16O, X), E(cm)=75, 80, 100 MeV; calculated ion-ion interaction potentials, fusion σ(E), fusion barrier distributions as function of incident energy. Density-constrained and direct time-dependent Hartree-Fock (DC-TDHF) methods. Comparison with experimental data.

doi: 10.1103/PhysRevC.89.034611
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2013DE23      Phys.Rev. C 88, 014602 (2013)

R.T.deSouza, S.Hudan, V.E.Oberacker, A.S.Umar

Confronting measured near- and sub-barrier fusion cross sections for 20O+12C with a microscopic method

NUCLEAR REACTIONS 12C(20O, X), E(cm)=6-16 MeV; calculated total fusion cross section, heavy-ion potentials, averaged fusion σ. Density-constrained time-dependent Hartree-Fock (DC-TDHF) microscopic method. Comparison with σ measurements for an experiment at SPIRAL-1, GANIL facility at E(20O)=1-2 MeV/nucleon. Comparison with other theoretical calculations.

doi: 10.1103/PhysRevC.88.014602
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2013OB01      Phys.Rev. C 87, 034611 (2013)

V.E.Oberacker, A.S.Umar

Microscopic analysis of sub-barrier fusion enhancement in 132Sn+40Ca versus 132Sn+48Ca

NUCLEAR REACTIONS 132Sn(40Ca, X), (48Ca, X), E(cm)=106-140 MeV; calculated heavy-ion potential, total fusion σ(E). Microscopic calculations based on density-constrained time-dependent Hartree-Fock theory (DC-TDHF) using Skyrme SLy4 interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.87.034611
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2013SI21      Phys.Rev. C 88, 024617 (2013)

C.Simenel, R.Keser, A.S.Umar, V.E.Oberacker

Microscopic study of 16O+16O fusion

NUCLEAR REACTIONS 16O(16O, X), E(cm)=6-40 MeV; calculated fusion σ(E) using three dimensional time-dependent Hartree-Fock (TDHF), and density-constrained time-dependent Hartree Fock (DC-TDHF) calculations. 16O(16O, X), E(cm)=6-13 MeV; calculated fusion σ(E) with no coupling and couplings to first 3- states in one or both nuclei using coupled-channel approach (CCFULL computer code). Discussed role of coupling to low-lying octupole states. Comparison with experimental data.

doi: 10.1103/PhysRevC.88.024617
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2012KE03      Phys.Rev. C 85, 044606 (2012)

R.Keser, A.S.Umar, V.E.Oberacker

Microscopic study of Ca + Ca fusion

NUCLEAR REACTIONS 40Ca(40Ca, X), 48Ca(40Ca, X), (48Ca, X), E(cm)=45-65; calculated total fusion σ(E), potential barriers, neutron and proton transfer, and excitation energy as a function of the ion-ion distance, isoscalar deformation parameter, power spectrum of isovector dipole amplitude. Microscopic time-dependent Hartree-Fock theory with density constraint (DC-TDHF). Comparison with experimental data.

doi: 10.1103/PhysRevC.85.044606
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2012LO10      Phys.Rev. C 86, 024608 (2012)

N.Loebl, A.S.Umar, J.A.Maruhn, P.-G.Reinhard, P.D.Stevenson, V.E.Oberacker

Single-particle dissipation in a time-dependent Hartree-Fock approach studied from a phase-space perspective

NUCLEAR REACTIONS 40Ca(40Ca, X), E(cm)=160, 200, 240 MeV; calculated β and γ deformation parameter, quadrupole moment, and volume phase-space global observables in momentum and coordinate space using the time-dependent Hartree-Fock (TDHF) theory and the Wigner distribution function in the full six-dimensional phase space. Significance of extra time-odd terms.

doi: 10.1103/PhysRevC.86.024608
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2012OB02      Phys.Rev. C 85, 034609 (2012)

V.E.Oberacker, A.S.Umar, J.A.Maruhn, P.-G.Reinhard

Dynamic microscopic study of pre-equilibrium giant resonance excitation and fusion in the reactions 132Sn + 48Ca and 124Sn + 40Ca

NUCLEAR REACTIONS 132Sn(48Ca, X), 124Sn(40Ca, X), E(cm)=130 MeV; calculated time evolution of isoscalar quadrupole moment, deformation parameter and rms charge radius, isovector quadrupole moment, dipole amplitude, neutron leakage, pre-equilibrium dipole radiation spectrum, total fusion cross sections, heavy-ion potential, microscopic mass parameter. Pre-equilibrium Giant dipole resonance (GDR) excitation. Density-constrained time-dependent Hartree-Fock (TDHF) method. Comparison with experimental data.

doi: 10.1103/PhysRevC.85.034609
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2012UM01      Phys.Rev. C 85, 017602 (2012)

A.S.Umar, V.E.Oberacker, J.A.Maruhn, P.-G.Reinhard

Microscopic composition of ion-ion interaction potentials

NUCLEAR REACTIONS 16O(16O, X), (24O, X), E(cm)=12 MeV; 40Ca(40Ca, X), E(cm)=55 MeV; 132Sn(48Ca, X), E(cm)=120 MeV; calculated ion-ion interaction potentials for head-on collisions using TDHF approach for the time evolution of the nuclear collision.

doi: 10.1103/PhysRevC.85.017602
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2012UM02      Phys.Rev. C 85, 055801 (2012)

A.S.Umar, V.E.Oberacker, C.J.Horowitz

Microscopic sub-barrier fusion calculations for the neutron star crust

NUCLEAR REACTIONS 12C, 16,24,28O(16O, X), (24O, X), E(cm)=2-13 MeV; calculated nuclear density contours, potential barriers, fusion σ(E), astrophysical S factor. Time-dependent Hartree-Fock theory with density-constrained Hartree-Fock calculations. Comparison with Sao Paulo static barrier penetration model and experimental data.

doi: 10.1103/PhysRevC.85.055801
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2011RE05      Phys.Rev. C 83, 034312 (2011)

P.-G.Reinhard, J.A.Maruhn, A.S.Umar, V.E.Oberacker

Localization in light nuclei

NUCLEAR STRUCTURE 4He, 8Be, 12,20C, 16O, 20Ne, 24Mg, 28Si; calculated contours of proton localization and total density. Spatial localization of light nuclei within the Hartree-Fock approximation.

doi: 10.1103/PhysRevC.83.034312
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2010OB01      Phys.Rev. C 82, 034603 (2010)

V.E.Oberacker, A.S.Umar, J.A.Maruhn, P.-G.Reinhard

Microscopic study of the 132, 124Sn+96Zr reactions: Dynamic excitation energy, energy-dependent heavy-ion potential, and capture cross section

NUCLEAR REACTIONS 96Zr(124Sn, X), (132Sn, X), (134Sn, X), E(cm)=195-260 MeV; calculated mass density contour plots, potential barriers, intrinsic mass quadrupole moment, heavy ion potential barriers, precompound excitation energy, capture and inelastic cross sections using time-dependent Hartree-Fock (TDHF) and density-constrained time-dependent Hartree-Fock methods (DC-TDHF).

doi: 10.1103/PhysRevC.82.034603
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2010UM01      Phys.Rev.Lett. 104, 212503 (2010)

A.S.Umar, J.A.Maruhn, N.Itagaki, V.E.Oberacker

Microscopic Study of the Triple-α Reaction

NUCLEAR REACTIONS 8Be(α, X)12C, E(cm)=2 MeV; calculated time evolution, potential energy curves for 4He + 8Be head-n collision, single-particle parities of the neutron states; deduced formation of a metastable linear chain state of three α-like clusters. Time-dependent Hartree-Fock theory.

doi: 10.1103/PhysRevLett.104.212503
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2010UM02      Phys.Rev. C 81, 064607 (2010)

A.S.Umar, V.E.Oberacker, J.A.Maruhn, P.-G.Reinhard

Entrance channel dynamics of hot and cold fusion reactions leading to superheavy elements

NUCLEAR REACTIONS 208Pb(70Zn, X), E(cm)=260-350 MeV; 238U(48Ca, X), E(cm)=180-250 MeV; calculated potential barriers, excitation energies, and capture σ using fully microscopic time-dependent Hartree-Fock theory coupled with a density constraint. Comparison with experimental data.

doi: 10.1103/PhysRevC.81.064607
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2009UM01      J.Phys.(London) G36, 025101 (2009)

A.S.Umar, V.E.Oberacker

Center-of-mass motion and cross-channel coupling in the time-dependent Hartree-Fock theory

doi: 10.1088/0954-3899/36/2/025101
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2009UM03      Eur.Phys.J. A 39, 243 (2009)

A.S.Umar, V.E.Oberacker

Density-constrained time-dependent Hartree-Fock calculation of 16O + 208Pb fusion cross-sections

NUCLEAR REACTIONS 208Pb(16O, X), E(cm)=65-110 MeV; calculated total fusion σ using energy-dependent density-constrained time-dependent Hartree-Fock method. Comparison with data.

doi: 10.1140/epja/i2008-10712-5
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2009UM04      Phys.Rev. C 80, 041601 (2009)

A.S.Umar, V.E.Oberacker, J.A.Maruhn, P.-G.Reinhard

Microscopic calculation of pre-compound excitation energies for heavy-ion collisions

NUCLEAR REACTIONS 16O(16O, X), E(cm)=11, 20, 34, 50 MeV; 34Ne(16O, X), E(cm)=11, 15, 30 MeV; 40Ca(40Ca, X), E(cm)=55, 60, 80, 100 MeV;calculated excitation energies, internuclear potentials, and ion-ion potentials for head-on collisions using time-dependent Hartree-Fock (TDHF) theory.

doi: 10.1103/PhysRevC.80.041601
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2008UM03      Phys.Rev. C 77, 064605 (2008)

A.S.Umar, V.E.Oberacker

64Ni+64Ni fusion reaction calculated with the density-constrained time-dependent Hartree-Fock formalism

NUCLEAR REACTIONS 64Ni(64Ni, X), E(cm)=86-110 MeV; calculated orientation probabilities, potential barriers, density contours, σ. Time-dependent Hartree-Fock model.

doi: 10.1103/PhysRevC.77.064605
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2008UM04      Eur.Phys.J. A 37, 245 (2008)

A.S.Umar, V.E.Oberacker, J.A.Maruhn

Neutron transfer dynamics and doorway to fusion in time-dependent Hartree-Fock theory

NUCLEAR REACTIONS 24O(16O, X), E(cm)=7, 8, 9 MeV; 96Zr(40Ca, X), E(cm)=91, 97 MeV; calculated neutron and single-particle probability densities, potential barrier using time-dependent Hartree-Fock model.

doi: 10.1140/epja/i2008-10614-6
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2007UM02      Phys.Rev. C 76, 014614 (2007)

A.S.Umar, V.E.Oberacker

64Ni+132Sn fusion within the density-constrained time-dependent Hartree-Fock formalism

NUCLEAR REACTIONS 132Sn(64Ni, f)E(cm)<200 MeV; calculated fusion cross sections using the density constrained time-dependent Hartree-Fock formalism.

doi: 10.1103/PhysRevC.76.014614
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2007UM03      Phys.Rev. C 76, 024316 (2007)

A.S.Umar, V.E.Oberacker

Compressibility and equation of state of finite nuclei

doi: 10.1103/PhysRevC.76.024316
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2006UM02      Phys.Rev. C 73, 054607 (2006)

A.S.Umar, V.E.Oberacker

Three-dimensional unrestricted time-dependent Hartree-Fock fusion calculations using the full Skyrme interaction

NUCLEAR REACTIONS 16O(16O, X), E(cm)=34 MeV; calculated fusion σ. Three-dimensional unrestricted time-dependent Hartree-Fock approach, Skyrme interaction.

doi: 10.1103/PhysRevC.73.054607
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2006UM03      Phys.Rev. C 74, 021601 (2006)

A.S.Umar, V.E.Oberacker

Heavy-ion interaction potential deduced from density-constrained time-dependent Hartree-Fock calculation

NUCLEAR REACTIONS 16O(16O, X), E(cm)=34 MeV; 22Ne(16O, X), E(cm)=50 MeV; calculated internuclear potentials. Density-constrained time-dependent Hartree-Fock calculation.

doi: 10.1103/PhysRevC.74.021601
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2006UM04      Phys.Rev. C 74, 024606 (2006)

A.S.Umar, V.E.Oberacker

Time dependent Hartree-Fock fusion calculations for spherical, deformed systems

NUCLEAR REACTIONS 162Dy(64Ni, 64Ni'), E(cm)=200, 265 MeV; calculated Coulomb excitation probabilities for ground-state rotational band, dynamic alignment features. 22Ne(16O, X), E(cm)=95 MeV; calculated dynamic alignment due to Coulomb excitation, fusion σ vs orientation. Time dependent Hartree-Fock approach.

doi: 10.1103/PhysRevC.74.024606
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2006UM06      Phys.Rev.C 74, 061601 (2006)

A.S.Umar, V.E.Oberacker

Dynamical deformation effects in subbarrier fusion of 64Ni+132Sn

NUCLEAR REACTIONS 132Sn(64Ni, X), E(cm)=140-180 MeV; calculated internuclear potential, fusion σ, dynamical deformation effects.

doi: 10.1103/PhysRevC.74.061601
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2005BL12      Phys.Rev. C 71, 054321 (2005)

A.Blazkiewicz, V.E.Oberacker, A.S.Umar, M.Stoitsov

Coordinate space Hartree-Fock-Bogoliubov calculations for the zirconium isotope chain up to the two-neutron drip line

NUCLEAR STRUCTURE 102,104,106,108,110,112,114,116,118,120,122,124Zr; calculated binding energies, two-neutron separation energies, quadrupole moments, β2, radii, pairing energies. Hartree-Fock-Bogoliubov approach.

doi: 10.1103/PhysRevC.71.054321
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2005BL32      Eur.Phys.J. A 25, Supplement 1, 543 (2005)

A.Blazkiewicz, V.E.Oberacker, A.S.Umar

2-D lattice HFB calculations for neutron-rich zirconium isotopes

NUCLEAR STRUCTURE 102,104,106,108,110,112,114,116,118,120,122Zr; calculated two-neutron separation energies, quadrupole moments, radii. Hartree-Fock-Bogoliubov approach.

doi: 10.1140/epjad/i2005-06-100-7
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2005UM01      Phys.Rev. C 71, 034314 (2005)

A.S.Umar, V.E.Oberacker

Time-dependent response calculations of nuclear resonances

NUCLEAR STRUCTURE 16O, 32S, 40Ca; calculated giant resonance response functions, time-dependent features.

doi: 10.1103/PhysRevC.71.034314
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2005UM02      Eur.Phys.J. A 25, Supplement 1, 553 (2005)

A.S.Umar, V.E.Oberacker

TDHF studies with modern Skyrme forces

NUCLEAR REACTIONS 22Ne(16O, X), E=2.5 MeV/nucleon; calculate density distributions vs time; deduced orientation effects on fusion σ. Three-dimensional time-dependent Hartree-Fock approach, Skyrme forces.

doi: 10.1140/epjad/i2005-06-087-y
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2003OB06      Phys.Rev. C 68, 064302 (2003)

V.E.Oberacker, A.S.Umar, E.Teran, A.Blazkiewicz

Hartree-Fock-Bogoliubov calculations in coordinate space: Neutron-rich sulfur, zirconium, cerium, and samarium isotopes

NUCLEAR STRUCTURE 32,34,36,38,40,42,44,46,48,50,52S; calculated two-neutron separation energies, quadrupole moments, radii. 102,104Zr, 152Ce, 156Nd, 160Sm; calculated deformation parameters, radii. 158Sm; calculated ground-state binding energy, pairing energies, radii, density distributions. Hartree-Fock-Bogoliubov approach.

doi: 10.1103/PhysRevC.68.064302
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2003TE03      Phys.Rev. C 67, 064314 (2003)

E.Teran, V.E.Oberacker, A.S.Umar

Axially symmetric Hartree-Fock-Bogoliubov calculations for nuclei near the drip lines

NUCLEAR STRUCTURE 22O, 102Zr, 150Sn; calculated binding energies, pair gap energies, radii. Hartree-Fock-Bogoliubov approach, continuum coupling.

doi: 10.1103/PhysRevC.67.064314
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2002TE18      Acta Phys.Hung.N.S. 16, 437 (2002)

E.Teran, V.E.Oberacker, A.S.Umar

Theoretical Description of Hartree-Fock Calculations under Axial Symmetry: First Results on Tin Isotopes

NUCLEAR STRUCTURE 120,150Sn; calculated binding energies, pair gaps, deformation. Comparison with data.

doi: 10.1556/APH.16.2002.1-4.46
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2000WA07      Phys.Rev. C61, 044308 (2000)

J.C.Wang, G.Canchel, P.Dendooven, J.H.Hamilton, S.Hankonen, J.Huikari, J.K.Hwang, A.Jokinen, V.S.Kolhinen, G.Lhersonneau, A.Nieminen, V.E.Oberacker, K.Perajarvi, A.V.Ramayya, J.Aysto

Low-Spin Structure of 110Ru Studied by β Decay of 110Tc

RADIOACTIVITY 110Tc(β-) [from 238U(p, F)]; measured Eγ, Iγ, γγ-, βγ-coin; deduced β-branching, logft. 110Ru deduced levels, J, π, B(E2). Level systematics in Ru isotopes discussed. Comparisons with model predictions.

doi: 10.1103/PhysRevC.61.044308
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Data from this article have been entered in the XUNDL database. For more information, click here.


1999BU32      J.Phys.(London) G25, 2253 (1999)

K.Butler-Moore, R.Aryaeinejad, X.Q.Zhang, B.R.S.Babu, J.H.Hamilton, A.V.Ramayya, J.K.Hwang, V.E.Oberacker, S.J.Zhu, J.Kormicki, L.K.Peker, J.D.Cole, Y.X.Dardenne, W.C.Ma, S.J.Asztalos, S.Y.Chu, K.E.Gregorich, I.Y.Lee, M.F.Mohar, J.O.Rasmussen, R.W.Lougheed, K.J.Moody, M.A.Stoyer, J.F.Wild, S.G.Prussin, G.M.Ter-Akopian, Yu.Ts.Oganessian, A.V.Daniel, J.Kliman, M.Morhac

High-Spin States in Neutron-Rich Even-Even Pd Isotopes

RADIOACTIVITY 252Cf(SF); measured Eγ, Iγ, γγ-coin. 112,114,116Pd deduced high-spin levels, J, π, configurations. Gammasphere array. IBA calculations, level systematics in Pd isotopes discussed.

Data from this article have been entered in the XUNDL database. For more information, click here.


1999OB03      Acta Phys.Hung.N.S. 10, 221 (1999)

V.E.Oberacker

Prompt Muon-Induced Fission: A probe for nuclear energy dissipation

NUCLEAR REACTIONS 237Np(μ-, F), E at rest; calculated fission fragments mass asymmetry, muon attachment probability; deduced sensitivity to nuclear energy dissipation. Time-dependent Dirac equation. Comparison with data.


1996TR05      Nucl.Phys. A601, 56 (1996)

D.Troltenier, J.P.Draayer, B.R.S.Babu, J.H.Hamilton, A.V.Ramayya, V.E.Oberacker

The 108,110,112Ru Isotopes in the Generalized Collective Model

NUCLEAR STRUCTURE 108,110,112Ru; calculated potential energy surfaces, levels, B(λ). Generalized collective model.

doi: 10.1016/0375-9474(96)00018-8
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1995LU10      Phys.Rev. C52, 1348 (1995)

Q.H.Lu, K.Butler-Moore, S.J.Zhu, J.H.Hamilton, A.V.Ramayya, V.E.Oberacker, W.C.Ma, B.R.S.Babu, J.K.Deng, J.Kormicki, J.D.Cole, R.Aryaeinejad, Y.X.Dardenne, M.Drigert, L.K.Peker, J.O.Rasmussen, M.A.Stoyer, S.Y.Chu, K.E.Gregorich, I.Y.Lee, M.F.Mohar, J.M.Nitschke, N.R.Johnson, F.K.McGowan, G.M.Ter-Akopian, Yu.Ts.Oganessian, J.B.Gupta

Structure of 108,110,112Ru: Identical bands in 108,110Ru

RADIOACTIVITY 252Cf(SF); measured Eγ, Iγ, γγ-, γγγ-, (X-ray)γ-coin. 108,110,112Ru deduced levels, J, π, intraband B(E2) ratios. Rotation-vibration, rigid triaxial rotor calculation.

doi: 10.1103/PhysRevC.52.1348
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1995WE16      Nucl.Instrum.Methods Phys.Res. B99, 293 (1995)

J.C.Wells, V.E.Oberacker, M.R.Strayer, A.S.Umar

Lattice Calculation for Lepton Capture from Vacuum-Pair Production in Relativistic Heavy-Ion Collisions

NUCLEAR REACTIONS 197Au(197Au, X), E=2 GeV/nucleon; calculated muon-pair production associated K-shell capture probabilities, relativistic collisions. Lattice collocation techniques, time-dependent Dirac equation.

doi: 10.1016/0168-583X(94)00652-0
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1993OB02      Phys.Rev. C48, 1297 (1993)

V.E.Oberacker, A.S.Umar, J.C.Wells, C.Bottcher, M.R.Strayer, J.A.Maruhn

Muon-Induced Fission: A probe for nuclear dissipation and fission dynamics

NUCLEAR STRUCTURE 238U; calculated mesonic atom levels, Coulomb interaction potential; deduced muon induced fission features.

ATOMIC PHYSICS, Mesic-Atoms 238U; calculated mesonic atom levels, Coulomb interaction potential; deduced muon induced fission features.

doi: 10.1103/PhysRevC.48.1297
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1992OB03      Phys.Lett. 293B, 270 (1992)

V.E.Oberacker, A.S.Umar, J.C.Wells, M.R.Strayer, C.Bottcher

Study of Nuclear Dissipation via Muon-Induced Fission. A Relativistic Lattice Calculation

NUCLEAR REACTIONS 238U(μ-, F), E at rest; calculated muon-nucleus Coulomb interaction vs time during fission, muon to light fission fragment attachment probability vs dissipated energy. Relativistic lattice calculation.

doi: 10.1016/0370-2693(92)90882-5
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1989KA03      J.Phys.(London) G15, 333 (1989)

M.W.Katoot, V.E.Oberacker

Microscopic Theory of Heavy-Ion Interaction Potentials

NUCLEAR REACTIONS 40Ca(40Ca, 40Ca), 90Zr(90Zr, 90Zr), 238U(238U, 238U), E not given; calculated interaction potentials.

doi: 10.1088/0954-3899/15/3/011
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1988WI11      Z.Phys. A330, 87 (1988)

G.Wirth, W.Bruchle, F.Wo, K.Summerer, F.Funke, J.V.Kratz, N.Trautmann, V.E.Oberacker

Fission in 238U + 238U Collisions Below the Coulomb Barrier

NUCLEAR REACTIONS 238U(238U, F), E=5.4-6.2 MeV/nucleon; measured fission σ(E); 239U(238U, X), E=5.05-6.07 MeV/nucleon; calculated one-nucleon transfer σ(θ); deduced reaction mechanism.


1986KA16      Phys.Lett. 172B, 292 (1986)

M.W.Katoot, V.E.Oberacker, W.T.Pinkston

Microscopic Theory of Heavy-Ion Potentials

NUCLEAR STRUCTURE 16O, 28Si, 40Ca, 64Ni, 74Ge, 116Ba, 236U; calculated binding energy. Many-body theory, effective Skyrme nucleon interaction.

NUCLEAR REACTIONS 28Si(28Si, 28Si), 40Ca(40Ca, 40Ca), 90Zr(90Zr, 90Zr), E not given; calculated heavy-ion potential parameters vs separation distance. Many-body theory, effective Skyrme nucleon-nucleon interaction.

doi: 10.1016/0370-2693(86)90254-6
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1985RU06      Phys.Lett. 158B, 201 (1985)

D.P.Russell, W.T.Pinkston, V.E.Oberacker

Pockets in Heavy-Ion Potentials and Nucleon Transfer

NUCLEAR REACTIONS 238U(238U, 238U), (238U, X), E=673 MeV; calculated elastic, single nucleon transfer σ(θ). Schematic model, potential pockets.

doi: 10.1016/0370-2693(85)90954-2
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1983RH01      Phys.Rev.Lett. 50, 1435 (1983)

M.J.Rhoades-Brown, V.E.Oberacker

Strong Enhancement of Subbarrier Fusion due to Negative Hexadecapole Deformation

NUCLEAR REACTIONS, ICPND 184W(16O, X), E(cm)=57-67 MeV; calculated fusion σ(E); deduced hexadecapole deformation effects. Modified barrier penetration model.

doi: 10.1103/PhysRevLett.50.1435
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1983RH02      Z.Phys. A310, 287 (1983)

M.J.Rhoades-Brown, V.E.Oberacker, M.Seiwert, W.Greiner

Potential Pockets in the 238U + 238U System and Their Possible Consequences

NUCLEAR REACTIONS 238U(238U, 238U), E=5.7-6 MeV/nucleon; calculated ion-ion interaction potential separation, shape, orientation dependence. Effective interactions, deformed matter densities, quadrupole, hexadecapole deformations.

doi: 10.1007/BF01419514
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1980MA17      Phys.Rev.Lett. 44, 1576 (1980)

J.A.Maruhn, V.E.Oberacker, V.Maruhn-Rezwani

Muon-Induced Fission as a Probe for Fission Dynamics

NUCLEAR REACTIONS 242Pu(μ-, F), E at rest; calculated heavy fragment muon capture probability; deduced muonic final state dependence on fission dynamics. Time dependent Schrodinger equation.

doi: 10.1103/PhysRevLett.44.1576
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