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Search: Author = G.Scamps

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2024FR02      Phys.Rev.Lett. 132, 142501 (2024)

A.Francheteau, L.Gaudefroy, G.Scamps, O.Roig, V.Meot, A.Ebran, G.Belier

Scission Deformation of the 120Cd/132Sn Neutronless Fragmentation in 252Cf

RADIOACTIVITY 252Cf(SF); measured decay products, Eγ, Iγ. 120Cd, 132Sn; deduced total kinetic energy (TKE) versus the mass of the fragment, γ-ray energies in coincidence with the neutronless fission events, fragment energy levels and transitions, deformation parameter using a time-dependent collective Hamiltonian model. Twin Frisch-grid ionization chamber (TFGIC).

doi: 10.1103/PhysRevLett.132.142501
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2024SC01      Phys.Rev. C 109, L011602 (2024)


Quantal effect on the opening angle distribution between the spins of the fission fragments

doi: 10.1103/PhysRevC.109.L011602
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2023GR08      Eur.Phys.J. A 59, 270 (2023)

G.Grams, W.Ryssens, G.Scamps, S.Goriely, N.Chamel

Skyrme-Hartree-Fock-Bogoliubov mass models on a 3D mesh: III. From atomic nuclei to neutron stars

doi: 10.1140/epja/s10050-023-01158-6
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2023RY02      Eur.Phys.J. A 59, 96 (2023)

W.Ryssens, G.Scamps, S.Goriely, M.Bender

Skyrme-Hartree-Fock-Bogoliubov mass models on a 3D mesh: IIb. Fission properties of BSkG2

NUCLEAR STRUCTURE 232,234,236,238U, 238,240,242,244Pu, 242,244,246,248Cm; analyzed available data; deduced fission barriers, potential energy surfaces as a function of quadrupole deformation, the effect of the rotational and vibrational correction, effect of triaxial deformation on the inner fission barrier. New BSkG2 model based on an energy density functional of the Skyrme type.

doi: 10.1140/epja/s10050-023-01002-x
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2023SC15      Phys.Rev. C 108, 034616 (2023)

G.Scamps, G.Bertsch

Generation, dynamics, and correlations of the fission fragments' angular momenta

doi: 10.1103/PhysRevC.108.034616
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2023SC16      Phys.Rev. C 108, L061602 (2023)

G.Scamps, I.Abdurrahman, M.Kafker, A.Bulgac, I.Stetcu

Spatial orientation of the fission fragment intrinsic spins and their correlations

doi: 10.1103/PhysRevC.108.L061602
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2022MA03      Phys.Lett. B 825, 136859 (2022)

K.Mahata, C.Schmitt, S.Gupta, A.Shrivastava, G.Scamps, K.-H.Schmidt

Evidence for the general dominance of proton shells in low-energy fission

RADIOACTIVITY 178Pt, 191Au, 180,182,190Hg, 201Tl, 194,196Po, 202Rn, 188Pb(SF); analyzed available data; deduced mean Z and N for of the light (heavy) fragment as a function of compound nucleus fissioning system.

doi: 10.1016/j.physletb.2021.136859
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2022RY02      Eur.Phys.J. A 58, 246 (2022)

W.Ryssens, G.Scamps, S.Goriely, M.Bender

Skyrme-Hartree-Fock-Bogoliubov mass models on a 3D mesh: II. Time-reversal symmetry breaking

NUCLEAR STRUCTURE N<160; calculated difference of masses with the Skyrme-based BSkG2 model whose parameters were adjusted to essentially all known nuclear masses without relying on the Equal Filling Approximation (EFA) and AME 20270; deduced model parameters.

doi: 10.1140/epja/s10050-022-00894-5
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2022SC14      Phys.Rev. C 106, 054614 (2022)


Microscopic description of the torque acting on fission fragments

RADIOACTIVITY 240Pu(SF); calculated energy of the fission fragment pairs 144Ba+96Sr and 132St+108Ru as a function of the orientation angle, Hartree-Fock potential as a function of the orientation, evolution of angular momentum density of fissioning fragments. Hartree-Fock (FHF) and the time-dependent Hartree-Fock (TDHF) methods.

doi: 10.1103/PhysRevC.106.054614
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2021SC16      Eur.Phys.J. A 57, 333 (2021)

G.Scamps, S.Goriely, E.Olsen, M.Bender, W.Ryssens

Skyrme-Hartree-Fock-Bogoliubov mass models on a 3D mesh: effect of triaxial shape

doi: 10.1140/epja/s10050-021-00642-1
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2020BE28      J.Phys.(London) G47, 113002 (2020)

M.Bender, R.Bernard, G.Bertsch, S.Chiba, J.Dobaczewski, N.Dubray, S.A.Giuliani, K.Hagino, D.Lacroix, Z.Li, P.Magierski, J.Maruhn, W.Nazarewicz, J.Pei, S.Peru, N.Pillet, J.Randrup, D.Regnier, P.G.Reinhard, L.M.Robledo, W.Ryssens, J.Sadhukhan, G.Scamps, N.Schunck, C.Simenel, J.Skalski, I.Stetcu, P.Stevenson, S.Umar, M.Verriere, D.Vretenar, M.Warda, S.Aberg

Future of nuclear fission theory

doi: 10.1088/1361-6471/abab4f
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2020DU01      Phys.Rev. C 101, 014309 (2020)

E.Dupont, A.Astier, C.M.Petrache, B.F.Lv, I.Deloncle, J.Kiener, R.Orlandi, H.Makii, K.Nishio, K.Hirose, M.Asai, T.K.Sato, K.Tsukada, Y.Ito, K.R.Kean, R.Yanagihara, G.Scamps

New excited 2+ and 3- two-proton states in 21084Po126 populated by two-proton transfer

NUCLEAR REACTIONS 208Pb(12C, 10Be)9Be/10Be/11B/12C/13C, 14C/210Po, E=58, 60, 62, 63.7 MeV; measured reaction products, light beamlike ejectiles, Eγ, Iγ, (charged particles)γ-coin at the 18 MV tandem of JAEA Tokai. 210Po; deduced six 2+ and three 3- levels in two-proton stripping reaction, configurations.

doi: 10.1103/PhysRevC.101.014309
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2019BU11      Phys.Rev. C 99, 054314 (2019)

S.Burrello, M.Colonna, G.Colo, D.Lacroix, X.Roca-Maza, G.Scamps, H.Zheng

Interplay between low-lying isoscalar and isovector dipole modes: A comparative analysis between semiclassical and quantum approaches

NUCLEAR STRUCTURE 68Ni, 132Sn, 208Pb; calculated neutron and proton rms radii, binding energies, isoscalar density and local asymmetry profiles, strength functions of the isoscalar (IS) response. 132Sn; calculated imaginary part of the IS response with IS and isovector (IV) perturbations, IS and IV dipole responses, strength function of the IS and IV responses, transition densities in the IS and IV strength functions. 100,120,132Sn; calculated isoscalar density profiles, strength function of the IS and IV responses for 100,120Sn, local asymmetry profiles, transition densities of the pygmy dipole resonances (PDR), transition densities of the second IV and IS peaks, fraction of the EWSR in the PDR region, for the IS and IV responses. Time-dependent Hartree-Fock (TDHF) calculations, with Skyrme functionals and SAMi-J31 interaction for the small amplitude dipole response. Comparison with zero-amplitude limit (RPA), and its semiclassical limit (Vlasov) calculations, and with experimental data.

doi: 10.1103/PhysRevC.99.054314
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2019SC14      Phys.Rev. C 100, 024623 (2019)

G.Scamps, Y.Hashimoto

Density-constrained time-dependent Hartree-Fock-Bogoliubov method

NUCLEAR REACTIONS 16O(16O, X), 20O(20O, X), E(cm)=6-15 MeV; 40Ca(40Ca, X), E(cm)=48-65 MeV; 44Ca(44Ca, X), E(cm)=53 MeV; calculated V(r) and fusion σ(E) versus distance between fragments (R) using a density-constrained time-dependent Hartree-Fock (DC-TDHF) method with a Gogny interaction and a DC-TDHF-Bogoliubov method.

doi: 10.1103/PhysRevC.100.024623
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2019SC17      Phys.Rev. C 100, 041602 (2019)

G.Scamps, C.Simenel

Effect of shell structure on the fission of sub-lead nuclei

NUCLEAR STRUCTURE 180Hg; calculated potential energy as a function of quadrupole moment along the symmetric fission path and asymmetric fission valley, neutron and proton single-particle energies as function of quadrupole and octupole deformation parameters for 100Ru, a heavy fragment in the fission of 180Hg. 176,178,180,182,184,186,188,190,192,194,196,198Hg; calculated centroids of light and heavy fragments in asymmetric fission due to the effect of octupole correlations induced by deformed shell gaps at N=52-56 neutrons in the fission fragments. Z=20-60, N=25-75; calculated expected values of the neutron and proton numbers of the fission fragments in the asymmetric mode of systems. Microscopic mean-field calculations of fission based on the Hartree-Fock approach with BCS pairing correlations.

doi: 10.1103/PhysRevC.100.041602
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2018RE04      Phys.Rev. C 97, 034627 (2018)

D.Regnier, D.Lacroix, G.Scamps, Y.Hashimoto

Microscopic description of pair transfer between two superfluid Fermi systems: Combining phase-space averaging and combinatorial techniques

NUCLEAR REACTIONS 20O(20O, X), E<Coulomb barrier; calculated probability to transfer one and two pairs in symmetric central collision as function of the closest distance of approach. 20O(14O, X), E(cm)=7.903, 8.903, 9.403 MeV; calculated average drift along with fluctuation of the number of transferred particles, and pair transfer probabilities. Phase-space combinatorial (PSC) technique combined with TDHFB framework to obtain multiple pair transfer probabilities between superfluid systems.

doi: 10.1103/PhysRevC.97.034627
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2018SC06      Phys.Rev. C 97, 044611 (2018)


Examining empirical evidence of the effect of superfluidity on the fusion barrier

NUCLEAR REACTIONS 90,96Zr(40Ca, X), E=87-105 MeV; 124Sn(40Ca, X), E=107.5-125.5 MeV; 168Er(34S, X), E=110-135 MeV; 208Pb(16O, X), E=70-82.5 MeV; 74Ge(18O, X), E=30-47.5 MeV; calculated σ(E), fusion barrier distribution using CCFULL code with local regression, and integral methods; deduced enhancement of the fluctuations of the fusion barrier between superfluid nuclei. Systematically evaluated 115 fusion reactions. Comparison with experimental values, and with time-dependent Hartree-Fock-Bogoliubov (TDHFB) predictions.

doi: 10.1103/PhysRevC.97.044611
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2018ZH37      Phys.Rev. C 98, 024622 (2018)

H.Zheng, S.Burrello, M.Colonna, D.Lacroix, G.Scamps

Connecting the nuclear equation of state to the interplay between fusion and quasifission processes in low-energy nuclear reactions

NUCLEAR REACTIONS 238U(40Ca, X), E(cm)=203 MeV; calculated density contour plot at different time instants, quadrupole moment Q(t) time evolution, symmetry energy and incompressibility dependence and surface effects of the quadrupole moment evolution; deduced impact of several different EOS on the exit channel (fusion versus quasifission) of nuclear reactions at energies close to the Coulomb barrier by using a variety of effective Skyrme interactions within the TDHF approach. 40Ca, 238U; calculated neutron and proton rms radii and their difference, quadrupole deformations, and binding energies using SAMi-J31 interaction. Relevance to production of superheavy elements.

doi: 10.1103/PhysRevC.98.024622
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2017SC03      Phys.Rev. C 95, 024613 (2017)

G.Scamps, C.Rodriguez-Tajes, D.Lacroix, F.Farget

Time-dependent mean-field determination of the excitation energy in transfer reactions: Application to the reaction 238U on 12C at 6.14 MeV/nucleon

NUCLEAR REACTIONS 12C(238U, X), (238U, 237U), (238U, 236U), (238U, 239Np), (238U, 241Pu), (238U, 240Pu), E=6.14 MeV/nucleon; calculated particle transfer probabilities, excitation energies, energy loss after reseparation, transfer-induced fission and transfer cross sections using time-dependent mean-field (TDHF3D+BCS) theory, and heavy-ion phase-space (HIPSE) model. Comparison with experimental data from GANIL.

doi: 10.1103/PhysRevC.95.024613
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2017SC15      Phys.Rev. C 96, 031602 (2017)

G.Scamps, Y.Hashimoto

Transfer probabilities for the reactions 14, 20O + 20O in terms of multiple time-dependent Hartree-Fock-Bogoliubov trajectories

NUCLEAR REACTIONS 20O(20O, X), E=8.91, 9.21, 9.31; calculated pair transfer probability as a function of time, neutron pair transfer probability as a function of distance. 14O(20O, X), E not given; calculated transfer probability of one and two neutrons as a function of the distance of closest approach. Time-dependent Hartree-Fock-Bogoliubov (TDHFB) theory.

doi: 10.1103/PhysRevC.96.031602
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2016HA21      Phys.Rev. C 94, 014610 (2016)

Y.Hashimoto, G.Scamps

Gauge angle dependence in time-dependent Hartree-Fock-Bogoliubov calculations of 20O+20O head-on collisions with the Gogny interaction

NUCLEAR REACTIONS 20O(20O, X), E(cm)=9.21, 9.41, 9.61 MeV; calculated density contours in y-z plane, trajectories of head-on collisions, pairing energies, numbers of transferred protons and neutrons. Time-dependent Hartree-Fock-Bogoliubov (TDHFB) calculations using Gogny D1S effective interaction for head-on collision processes.

doi: 10.1103/PhysRevC.94.014610
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2016SC24      Phys.Rev. C 94, 064606 (2016)

G.Scamps, V.V.Sargsyan, G.G.Adamian, N.V.Antonenko, D.Lacroix

Extraction of pure transfer probabilities from experimental transfer and capture data

NUCLEAR REACTIONS 96Zr(40Ca, X), E=84-111 MeV; calculated s-wave capture probability, one- and two-neutron transfer probabilities. Comparison with experimental data.

doi: 10.1103/PhysRevC.94.064606
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2015HA28      Phys.Rev. C 92, 064602 (2015)

K.Hagino, G.Scamps

Enhancement factor for two-neutron transfer reactions with a schematic coupled-channels model

NUCLEAR REACTIONS 96Zr(40Ca, n), (40Ca, 2n), E not given; calculated one-neutron (Pn) and two-neutron (P2n) transfer probabilities in the no-correlation limit. Schematic coupled-channels model, with the transfer channels treated as effective inelastic excitations. Comparison to experimental data.

doi: 10.1103/PhysRevC.92.064602
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2015LA21      Int.J.Mod.Phys. E24, 1541005 (2015)

D.Lacroix, Y.Tanimura, G.Scamps, C.Simenel

Microscopic description of large amplitude collective motion in the nuclear astrophysics context

doi: 10.1142/S0218301315410050
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2015SC03      Phys.Rev. C 91, 024601 (2015)

G.Scamps, V.V.Sargsyan, G.G.Adamian, N.V.Antonenko, D.Lacroix

Analysis of the dependence of the few-neutron transfer probability on the Q-value magnitudes

NUCLEAR REACTIONS 116,124,130Sn(40Ca, xn), at Vb-E(cm)<25 MeV; analyzed dependence of one-, two-, three-, and four-neutron transfer probabilities on the magnitudes of Q values, and compared with calculations of nucleon transfer probabilities within the time-dependent Hartree-Fock plus BCS approach.

doi: 10.1103/PhysRevC.91.024601
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2015SC08      Phys.Rev. C 91, 044606 (2015)

G.Scamps, K.Hagino

Multidimensional fission model with a complex absorbing potential

doi: 10.1103/PhysRevC.91.044606
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2015SC11      Phys.Rev. C 92, 011602 (2015)

G.Scamps, C.Simenel, D.Lacroix

Superfluid dynamics of 258Fm fission

RADIOACTIVITY 258Fm(SF); calculated potential energies and density contours in symmetric compact fragment, symmetric elongated fragment, and asymmetric elongated fragment, distribution of TKEs, time evolution of pairing energy and quadrupole moment, proton and neutron number distributions in the fragments. Role of quantum shell effects and quantum fluctuations in the dynamics and formation of the fragments. Time-dependent Hartree-Fock theory including BCS dynamical pairing correlations. Comparison with experimental data.

doi: 10.1103/PhysRevC.92.011602
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2015SC19      Phys.Rev. C 92, 054614 (2015)

G.Scamps, K.Hagino

Coupled-channels description of multinucleon transfer and fusion reactions at energies near and far below the Coulomb barrier

NUCLEAR REACTIONS 96Zr(40Ca, X), E(cm)=82-102 MeV; 116Sn(60Ni, X), E(cm)=150-175 MeV; calculated 1n- and 2n-transfer probabilities, s-wave survival probability for each channel, fusion σ(E). Adjustment of parameters for transfer couplings using the experimental data at energies far below the Coulomb barrier. Simultaneously description for fusion and transfer cross sections, role of absorption and sequential and direct two-neutron transfer process. Semiclassical time-dependent coupled-channels method using a modified version of CCFULL computer code. Comparison with experimental data.

doi: 10.1103/PhysRevC.92.054614
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2015TA21      Phys.Rev. C 92, 034601 (2015)

Y.Tanimura, D.Lacroix, G.Scamps

Collective aspects deduced from time-dependent microscopic mean-field with pairing: Application to the fission process

NUCLEAR STRUCTURE 258Fm; calculated potential energy curve, neutron and proton single-particle energies as function of quadrupole moment along the adiabatic potential energy curve (PEC) using EV8 program.

RADIOACTIVITY 258Fm(SF); calculated Density profiles for different initial Q2 and as a function of time, Quadrupole mass parameter from time-dependent energy density functional (TD-EDF) paths, evolution of the total collective kinetic energy as a function of time. Time-dependent microscopic mean-field theory with pairing.

doi: 10.1103/PhysRevC.92.034601
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2014AD23      Phys.Rev. C 90, 034322 (2014)

G.G.Adamian, N.V.Antonenko, L.A.Malov, G.Scamps, D.Lacroix

Effects of angular dependence of surface diffuseness in deformed nuclei on Coulomb barrier

NUCLEAR STRUCTURE 152Sm, 220,238U; calculated neutron, proton density distributions. 220,222,224,226,228,230,232,234Ra, 220,222,224,226,228,230,232,234,236,238Th, 240,242,244,246,248,250,252Cm; calculated isotopic dependency of average surface diffuseness. 226,228,230,232,234,236,238,240U; calculated isotopic dependencies of nucleon density distribution diffuseness. self-consistent calculations. Comparison with phenomenological mean-field potential calculations.

NUCLEAR REACTIONS 238U(36S, 36S), (16O, 16O), E not given; calculated dependencies of the Coulomb-barrier heights on the orientation angle. Self-consistent and mean-field potential calculations.

doi: 10.1103/PhysRevC.90.034322
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2014SC03      Phys.Rev. C 89, 034314 (2014)

G.Scamps, D.Lacroix

Systematic study of isovector and isoscalar giant quadrupole resonances in normal and superfluid deformed nuclei

NUCLEAR STRUCTURE Z=8-110, N=8-170; Z=60, A=124-160; Z=62, A=128-164; 178,184,190Pt, 200Hg, 232Th, 254No; calculated isovector (IV) and isoscalar (IS) giant quadrupole resonance (GQR) energies, strengths, widths, damping widths, effect of deformation on fragmentation and damping, ground-state deformation parameters β2, β4, β6 versus mass. IS- and IV-GQR restoring force as function of mass, GQR splitting for 749 nuclei; deduced prolate deformation for 301 nuclei, and oblate for 65 nuclei. Interplay between deformation and collective motion. Triaxial nuclei. Plots of GQR resonance strengths and widths for all deformed nuclei given in supplemental material. Time-independent energy density functional theory based on Skyrme effective interaction using EV8 computer code. Discussed geometric deformation effects and coupling to other vibrational modes.

doi: 10.1103/PhysRevC.89.034314
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2013SA64      Phys.Rev. C 88, 064601 (2013)

V.V.Sargsyan, G.Scamps, G.G.Adamian, N.V.Antonenko, D.Lacroix

Neutron-pair transfer in the sub-barrier capture process

NUCLEAR REACTIONS 58Ni(64Ni, 2n), E(cm)=88-110 MeV; 64Ni(132Sn, 2n), E(cm)=145-220 MeV; 40Ca(48Ca, 2n), E(cm)=46-66 MeV; 40Ca(116Sn, 2n), (124Sn, 2n), E(cm)=106-133 MeV; 102,104Ru, 104,106Pd(32S, 2n), E(cm)=74-94 MeV; calculated 2n transfer σ(E). 58Ni(62Ni, X), 40Ca(64Ni, X), E(cm)-Vb=-8 to 11 MeV; calculated capture σ(E). 116,124,130Sn(40Ca, n), 116,124,130Sn(40Ca, 2n), B0-E(cm)<22 MeV; calculated one-neutron and two-neutron transfer probabilities. Comparison with experimental data. TDHF plus BCS Within the quantum diffusion approach for neutron pair transfer and pair correlation phenomenon. Evidence for dominance of the dineutron (preformed dineutron-like clusters) structure.

doi: 10.1103/PhysRevC.88.064601
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2013SC02      Phys.Rev. C 87, 014605 (2013)

G.Scamps, D.Lacroix

Effect of pairing on one- and two-nucleon transfer below the Coulomb barrier: A time-dependent microscopic description

NUCLEAR REACTIONS 40,42,44,46,48,50Ca(40Ca, X), E(cm)=36-50 MeV; calculated neutron density, one- and two-neutron transfer probabilities, fusion barrier, neutron pairing gap. Time-dependent Hartree-Fock (TDHF)+ BCS approach. Comparison with experimental data. Effect of pairing correlation on transfer reactions.

doi: 10.1103/PhysRevC.87.014605
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2013SC21      Phys.Rev. C 88, 044310 (2013)

G.Scamps, D.Lacroix

Systematics of isovector and isoscalar giant quadrupole resonances in normal and superfluid spherical nuclei

NUCLEAR STRUCTURE A=20-235; calculated isoscalar and isovector quadrupole responses in spherical nuclei, rms radii, energy, width, quadrupole moments and %EWSR of ISGQR and IVGQR, energies and B(E2) values of first 2+ states. TDHF+BCS approach based on different Skyrme energy density functionals. Comparison with experimental data.

doi: 10.1103/PhysRevC.88.044310
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2013SC24      Phys.Rev. C 88, 064327 (2013)

G.Scamps, D.Lacroix, G.G.Adamian, N.V.Antonenko

Polarization of the nuclear surface in deformed nuclei

NUCLEAR STRUCTURE Z=8-108; analyzed behavior of the nuclear diffuseness polarization, nuclear density, r0, correlations between the neutron and proton deformation and diffuseness parameters, fusion barrier in the 40Ca+238U reaction. 158,168,178Yb, 226,234,242U; calculated contours of shape and diffuseness distortions. HF+BCS calculation in r space with Skyrme energy density functional theory using EV8 computer code.

doi: 10.1103/PhysRevC.88.064327
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2012SC05      Phys.Rev. C 85, 034328 (2012)

G.Scamps, D.Lacroix, G.F.Bertsch, K.Washiyama

Pairing dynamics in particle transport

doi: 10.1103/PhysRevC.85.034328
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