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NSR database version of April 11, 2024.

Search: Author = X.Roca-Maza

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2024SA06      Phys.Rev. C 109, L011302 (2024)

H.Sagawa, T.Naito, X.Roca-Maza, T.Hatsuda

QCD-based charge symmetry breaking interaction and the Okamoto-Nolen-Schiffer anomaly

doi: 10.1103/PhysRevC.109.L011302
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2023FE08      Phys. Rev. Res. 5, L022044 (2023)

R.W.Fearick, P.von Neumann-Cosel, S.Bacca, J.Birkhan, F.Bonaiti, I.Brandherm, G.Hagen, H.Matsubara, W.Nazarewicz, N.Pietralla, V.Yu.Ponomarev, P.-G.Reinhard, X.Roca-Maza, A.Richter, A.Schwenk, J.Simonis, and A.Tamii

Electric dipole polarizability of 40Ca

NUCLEAR REACTIONS 40Ca(p, p'), E=5-25 MeV; measured reaction products, Ep, Ip; deduced electric dipole strength distribution, σ(θ, E). Comparison with available data. The Grand Raiden spectrometer, RCNP, Osaka.

doi: 10.1103/PhysRevResearch.5.L022044
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2023JA09      Phys.Rev. C 108, 034314 (2023)

D.H.Jakubassa-Amundsen, X.Roca-Maza

Dispersion effects in elastic electron scattering from 208Pb

doi: 10.1103/PhysRevC.108.034314
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2023KL02      Phys.Rev. C 108, 035808 (2023)

P.Klausner, F.Barranco, P.M.Pizzochero, X.Roca-Maza, E.Vigezzi

Microscopic calculation of the pinning energy of a vortex in the inner crust of a neutron star

doi: 10.1103/PhysRevC.108.035808
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2023MA20      Phys.Rev. C 107, 044311 (2023)

F.Marino, G.Colo, X.Roca-Maza, E.Vigezzi

Perturbed nuclear matter studied within density functional theory with a finite number of particles

doi: 10.1103/PhysRevC.107.044311
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2023NA16      Phys.Rev. C 107, 064302 (2023)

T.Naito, G.Colo, H.Liang, X.Roca-Maza, H.Sagawa

Effects of Coulomb and isospin symmetry breaking interactions on neutron-skin thickness

NUCLEAR STRUCTURE 16O, 40,48Ca, 48Ni, 208Pb; calculated neutron-skin-thickness. 40,48Ca; calculated charge radii difference between 40Ca and 48Ca. 48Ca, 48Ni; calculated mass difference of mirror nuclei.Investigated the influence of the corrections to the Hartree-Fock-Slater approximation by the Coulomb interaction and charge-symmetry breaking term originating from the strong interaction. Comparison to experimental values.

doi: 10.1103/PhysRevC.107.064302
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2022LI14      Phys.Rev. C 105, 034309 (2022)

A.Liardi, F.Marino, G.Colo, X.Roca-Maza, E.Vigezzi

Complete solution to the inverse Kohn-Sham problem: From the density to the energy

NUCLEAR STRUCTURE 16O; calculated neutron density, self-consistent potentials, kinetic energies, total energies. Comparison between inverse Kohn-Sham and constrained Hartree-Fock calculations. Proposed complete solution of the inverse Kohn-Sham density functional theory problem. Discussed possible applications of the proposed method to ab-initio calculations.

doi: 10.1103/PhysRevC.105.034309
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2022NA10      Phys.Rev. C 105, L021304 (2022)

T.Naito, G.Colo, H.Liang, X.Roca-Maza, H.Sagawa

Toward ab initio charge symmetry breaking in nuclear energy density functionals

NUCLEAR STRUCTURE 48Ca, 208Pb; calculated neutron skin thickness, mass difference for mirror nuclei 48Ca-48Ni, dependence of neutron-skin thickness on the charge symmetry breaking strength s0. Comparison to experimental data.

doi: 10.1103/PhysRevC.105.L021304
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2022NA38      Phys.Rev. C 106, L061306 (2022)

T.Naito, X.Roca-Maza, G.Colo, H.Liang, H.Sagawa

Isospin symmetry breaking in the charge radius difference of mirror nuclei

NUCLEAR STRUCTURE 48Ca, 48Ni; calculated charge radius difference of mirror nuclei. Discussed the connection of obtained values with the nuclear equation of state and effect of isospin symmetry breaking on such relation. Hartree-Fock calculations with SAMi-J family of energy density functionals.

doi: 10.1103/PhysRevC.106.L061306
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2022RE14      Phys.Rev.Lett. 129, 232501 (2022)

P.-G.Reinhard, X.Roca-Maza, W.Nazarewicz

Combined Theoretical Analysis of the Parity-Violating Asymmetry for 48Ca and 208Pb

NUCLEAR STRUCTURE 48Ca, 208Pb; analyzed available data; deduced the parity violating asymmetry, the static electric dipole polarizability, masses and charge radii.

doi: 10.1103/PhysRevLett.129.232501
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2022XU09      Phys.Lett. B 833, 137333 (2022)

J.-Y.Xu, Z.-Z.Li, B.-H.Sun, Y.-F.Niu, X.Roca-Maza, H.Sagawa, I.Tanihata

Constraining equation of state of nuclear matter by charge-changing cross section measurements of mirror nuclei

NUCLEAR STRUCTURE 30Si, 30S; analyzed available data; calculated the charge changing σ difference for both the Skyrme-Hartree-Fock theory (SHF) and covariant (relativistic) density functionals (CDF).

doi: 10.1016/j.physletb.2022.137333
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2021KO22      Phys.Rev. C 103, 064316 (2021)

O.Koshchii, M.Gorchtein, X.Roca-Maza, H.Spiesberger

Beam-normal single-spin asymmetry in elastic scattering of electrons from a spin-0 nucleus

NUCLEAR REACTIONS 12C, 28Si, 40Ca, 90Zr, 208Pb(e, e), E=0.57-3 GeV; analyzed beam-normal single-spin asymmetry (BNSSA) observed in the PREX collaboration for 208Pb, called the PREX puzzle using plane-wave formalism and Compton scattering cross section data for 12C, 27Al, 49Ti, 64Cu, 109Ag and 197Au; deduced average values and corresponding theoretical uncertainties for the Compton slope parameter; predicted kinematical conditions of soon-to-be published measurements by the PREX-II, CREX, and Qweak collaborations at Jefferson Lab.

doi: 10.1103/PhysRevC.103.064316
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2021MA52      Phys.Rev. C 104, 024315 (2021)

F.Marino, C.Barbieri, A.Carbone, G.Colo, A.Lovato, F.Pederiva, X.Roca-Maza, E.Vigezzi

Nuclear energy density functionals grounded in ab initio calculations

NUCLEAR STRUCTURE 16O, 34Si, 36S, 36,40,48,52Ca, 90Zr, 132Sn, 208Pb; calculated energies per nucleon and charge radii by ab initio computation of equations of state (EoSs) of symmetric nuclear and pure neutron matter using the chiral NNLOsat-based nuclear energy density functional (EDF), and the phenomenological AV4+UIXc Hamiltonians. Comparison with experimental data. Discussed practical and systematic way to merge ab initio nuclear theory and density functional theory.

doi: 10.1103/PhysRevC.104.024315
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2021NA16      Phys.Rev. C 104, 024316 (2021)

T.Naito, G.Colo, H.Liang, X.Roca-Maza

Second and fourth moments of the charge density and neutron-skin thickness of atomic nuclei

NUCLEAR STRUCTURE 36,38,40,42,44,46,48,50,52,54Ca, 100,102,104,106,108,110,112,114,116,118,120,122,124,126,128,130,132,134,136,138,140Sn; calculated second r2 and fourth r4 moments of the proton, neutron, and charge density distributions as function of mass number, correlation of proton second and fourth moments for 44,46Ca, 110,112Sn. Skyrme Hartree-Fock-Bogoliubov calculation with the assumption of axial symmetry using the code HFBTHO and SLy4 energy density functional. Comparison with experimental data. Relevance to extraction of neutron radius using the experimentally measured second and fourth moments of the charge distribution.

doi: 10.1103/PhysRevC.104.024316
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2021RE13      Phys.Rev.Lett. 127, 232501 (2021)

P.-G.Reinhard, X.Roca-Maza, W.Nazarewicz

Information Content of the Parity-Violating Asymmetry in 208Pb

NUCLEAR STRUCTURE 208Pb; analyzed data on the parity-violating asymmetry; deduced the theoretical uncertainty, neutron skin thickness, the symmetry-energy slope. Set of relativistic energy density functionals.

doi: 10.1103/PhysRevLett.127.232501
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2020AC03      Phys.Rev. C 101, 024315 (2020)

G.Accorto, P.Brandolini, F.Marino, A.Porro, A.Scalesi, G.Colo, X.Roca-Maza, E.Vigezzi

First step in the nuclear inverse Kohn-Sham problem: From densities to potentials

NUCLEAR STRUCTURE 40Ca, 208Pb; calculated neutron and proton densities, Kohn-Sham (KS) potentials for neutrons and protons using an iterative procedure of van Leeuwen and Baerends (vLB) and the constrained variational (CV) procedure for the density functional theory (DFT). Inversion methods for the inverse Kohn-Sham (KS) problem, based on Hohenberg-Kohn theorems(HKTs). Comparison with experimental densities.

doi: 10.1103/PhysRevC.101.024315
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2020BA50      Phys.Lett. B 810, 135804 (2020)

S.Bassauer, P.von Neumann-Cosel, P.-G.Reinhard, A.Tamii, S.Adachi, C.A.Bertulani, P.Y.Chan, G.Colo, A.D'Alessio, H.Fujioka, H.Fujita, Y.Fujita, G.Gey, M.Hilcker, T.H.Hoang, A.Inoue, J.Isaak, C.Iwamoto, T.Klaus, N.Kobayashi, Y.Maeda, M.Matsuda, N.Nakatsuka, S.Noji, H.J.Ong, I.Ou, N.Paar, N.Pietralla, V.Yu.Ponomarev, M.S.Reen, A.Richter, X.Roca-Maza, M.Singer, G.Steinhilber, T.Sudo, Y.Togano, M.Tsumura, Y.Watanabe, V.Werner

Evolution of the dipole polarizability in the stable tin isotope chain

NUCLEAR REACTIONS 112,114,116,118,120,124Sn(p, p'), E=295 MeV; 116Sn(γ, X), E<30 MeV; measured reaction products, Ep, Ip; deduced σ(θ, E), σ, total dipole polarizability. Comparison with available data.

doi: 10.1016/j.physletb.2020.135804
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2020GO15      Phys.Rev. C 102, 064309 (2020)

S.Goriely, S.Peru, G.Colo, X.Roca-Maza, I.Gheorghe, D.Filipescu, H.Utsunomiya

E1 moments from a coherent set of measured photoneutron cross sections

NUCLEAR REACTIONS 59Co, 89Y, 103Rh, 139La, 159Tb, 165Ho, 169Tm, 181Ta, 197Au, 209Bi(γ, xn), E=neutron threshold to 40 MeV quasimonochromatic laser Compton-scattering (LCS) γ-ray beams; analyzed E1 moments, dipole polarizability times the symmetry energy, and enhancement factor of the TRK sum rule from experimental data for E1 photoneutron σ(E), integrated σ(E)TRK, centroid energies, and the polarizabilities obtained at the newSUBARU facility. Skyrme and Gogny Hartree-Fock-Bogolyubov (HFB) plus QRPA calculations, with D1M, D1S, and D1N interactions. Comparison between experimental E1 photon strength function (PSF) of 208Pb and 209Bi with the corresponding estimate of the strength contribution to the polarizability.

doi: 10.1103/PhysRevC.102.064309
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetK2683.


2020GR10      Phys.Rev. C 102, 015501 (2020)

J.M.Grames, C.K.Sinclair, M.Poelker, X.Roca-Maza, M.L.Stutzman, R.Suleiman, Md.A.Mamun, M.McHugh, D.Moser, J.Hansknecht, B.Moffit, T.J.Gay

High precision 5 MeV Mott polarimeter

NUCLEAR REACTIONS 197Au(polarized e, e), E=4.7, 5, 5.3 MeV; measured energy and timing of the scattered electrons, time-of-flight distribution of Mott coincidence triggers, E-ΔE histograms, normalized energy spectra, energy-time coincidence plots, Mott scattering asymmetries, and beam polarizations using a newly designed Mott polarimeter at the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab; deduced Pade functions for asymmetries, differential σ(E). Comparison to GEANT4 simulation. Relevance to next generation of parity-violation measurements.

doi: 10.1103/PhysRevC.102.015501
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2020KO22      Phys.Rev. C 102, 022501 (2020)

O.Koshchii, J.Erler, M.Gorchtein, C.J.Horowitz, J.Piekarewicz, X.Roca-Maza, C.-Y.Seng, H.Spiesberger

Weak charge and weak radius of 12C

NUCLEAR REACTIONS 12C(e, e), E=155 MeV; calculated parity-violating (PV) asymmetry; deduced weak charge, weak radius and neutron skin of 12C nucleus. Parity-violating electron scattering (PVEC), based on model-independent assessment of the uncertainties. Relevance to experiments at the upcoming MESA facility in Mainz, to quantification of generic isospin symmetry-breaking (ISB) effects, test of unitarity of Cabibbo-Kobayashi-Maskawa (CKM) matrix, and new physics searches with superallowed β decays.

doi: 10.1103/PhysRevC.102.022501
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2020NA19      Phys.Rev. C 101, 064311 (2020)

T.Naito, X.Roca-Maza, G.Colo, H.Liang

Effects of finite nucleon size, vacuum polarization, and electromagnetic spin-orbit interaction on nuclear binding energies and radii in spherical nuclei

NUCLEAR STRUCTURE 4He, 14,16,24O, 40,48Ca, 48Ni, 100,124,132,162Sn, 208Pb, 310126; calculated total energies, Coulomb energies, and charge radii, ratios of the Coulomb direct and exchange energies, mirror nuclei mass difference between 48Ca and 48Ni using self-consistent Skyrme Hartree-Fock method with generalized gradient approximation (GGA), and including electromagnetic effects of nucleon finite size, vacuum polarization, and electromagnetic spin-orbit interaction. Comparison with other theoretical predictions.

doi: 10.1103/PhysRevC.101.064311
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2020RO01      Phys.Rev. C 101, 014320 (2020)

X.Roca-Maza, H.Sagawa, G.Colo

Double charge-exchange phonon states

NUCLEAR STRUCTURE 48Ca, 78Ni, 90Zr, 132,176Sn, 208Pb; calculated energy differences between the isobaric analog states (IAS) and double isobaric analog states (DIAS), contribution of the Coulomb direct and exchange terms to these energy differences, excitation energies of single and double Gamow-Teller giant resonances (GTR) using double and quartic commutator relations for double charge-exchange (DCX) phonon states in neutron-rich nuclei. Comparison with experimental data.

doi: 10.1103/PhysRevC.101.014320
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2020RO23      Phys.Rev. C 102, 064303 (2020)

X.Roca-Maza, H.Sagawa, G.Colo

Isobaric analog state energy in deformed nuclei: A toy model

NUCLEAR STRUCTURE 102,104,106,108,110,112,114,116,118,120,122,124,126,128,130Sn; calculated energies and isospin mixing probabilities of the isobaric analog states (IAS). 102Pd, 106Cd, 112Sn, 120Te, 124Xe, 130Ba, 136,138Ce, 142Nd, 144Sm, 156,158Dy, 162,164Er, 168Yb, 174,176Hf, 180W, 184Os, 190Pt, 196Hg; calculated deformation parameters, proton rms radii, and neutron skin thicknesses, direct Coulomb, exchange Coulomb and the isospin mixing contributions to the IAS, deformation effect on the IAS energy. Microscopic deformed Hartree-Fock-Bogoliubov (HFB) calculations with the SAMi energy density functional. Comparison with available experimental data. Relevance to planned experiments in the neutron-deficient nuclei proposed in the LUNESTAR project at RCNP, Osaka University.

doi: 10.1103/PhysRevC.102.064303
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2020SH07      Phys.Rev. C 101, 044316 (2020)

S.Shen, G.Colo, X.Roca-Maza

Particle-vibration coupling for giant resonances beyond the diagonal approximation

NUCLEAR STRUCTURE 16O; calculated strength functions and sum rules (EWSR) for isoscalar giant monopole resonance (ISGMR), isoscalar giant dipole resonance (ISGDR), isoscalar giant quadrupole resonance (ISGQR) using random phase approximation (RPA), and self-consistent particle-vibration coupling (PVC) model with and without diagonal approximation. Comparison with experimental results, and with other theoretical predictions.

doi: 10.1103/PhysRevC.101.044316
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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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2019NA03      Phys.Rev. C 99, 024309 (2019)

T.Naito, X.Roca-Maza, G.Colo, H.Liang

Coulomb exchange functional with generalized gradient approximation for self-consistent Skyrme Hartree-Fock calculations

NUCLEAR STRUCTURE 4He, 14,16,24O, 40,48Ca, 100,124,132,162Sn, 208Pb, 310126; calculated Coulomb exchange energies with the LDA and PBE-GGA Coulomb exchange functionals and compared with the exact-Fock energies, radial Coulomb exchange potential, proton and neutron density distributions, and proton single-particle energies in 208Pb using self-consistent Skyrme Hartree-Fock calculations with Coulomb exchange functional and generalized gradient approximation (GGA). Comparison with values calculated by local density approximation.

doi: 10.1103/PhysRevC.99.024309
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2019SA57      Eur.Phys.J. A 55, 227 (2019)

H.Sagawa, G.Colo, X.Roca-Maza, Y.Niu

Collective excitations involving spin and isospin degrees of freedom

doi: 10.1140/epja/i2019-12923-y
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2019SH16      Phys.Rev. C 99, 034322 (2019)

S.Shen, G.Colo, X.Roca-Maza

Skyrme functional with tensor terms from ab initio calculations of neutron-proton drops

NUCLEAR STRUCTURE 16O, 40,48Ca, 56,68Ni, 90Zr, 100,132Sn, 208Pb; calculated binding energies, charge radii, strength function associated with the GMR and isovector GDR in 208Pb, Gamow-Teller resonance (GTR) strength function for 48Ca, 90Zr, 208Pb, and spin-dipole resonance (SDR) strength function for 90Zr, 208Pb using SAMi-T functional. Calculations used ab initio relativistic Brueckner-Hartree-Fock approach with a new Skyrme functional Sami-T for neutron-proton drops. Comparison with experimental data and other theoretical predictions.

doi: 10.1103/PhysRevC.99.034322
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2019ZA06      Phys.Rev.Lett. 123, 112501 (2019)

S.Zanoli, X.Roca-Maza, G.Colo, S.Shen

Harmonic Potential Theorem: Extension to Spin-, Velocity-, and Density-Dependent Interactions

doi: 10.1103/physrevlett.123.112501
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2018RO08      Phys.Rev.Lett. 120, 202501 (2018)

X. Roca-Maza, G. Colo, H. Sagawa

Nuclear Symmetry Energy and the Breaking of the Isospin Symmetry: How Do They Reconcile with Each Other?

NUCLEAR STRUCTURE 208Pb; analyzed available data; calculated isobaric analog states using state-of-the-art Hartree-Fock plus random phase approximation.

doi: 10.1103/PhysRevLett.120.202501
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2018RO12      Prog.Part.Nucl.Phys. 101, 96 (2018)

X.Roca-Maza, N.Paar

Nuclear equation of state from ground and collective excited state properties of nuclei

doi: 10.1016/j.ppnp.2018.04.001
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2016MO20      Phys.Rev. C 93, 064303 (2016)

C.Mondal, B.K.Agrawal, M.Centelles, G.Colo, X.Roca-Maza, N.Paar, X.Vinas, S.K.Singh, S.K.Patra

Model dependence of the neutron-skin thickness on the symmetry energy

NUCLEAR STRUCTURE 132Sn, 208Pb; calculated symmetry-energy coefficient and symmetry-energy slope parameter as a function of neutron-skin thickness using several microscopic mean-field models.

doi: 10.1103/PhysRevC.93.064303
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2016RO25      Phys.Rev. C 94, 044313 (2016)

X.Roca-Maza, L.-G.Cao, G.Colo, H.Sagawa

Fully self-consistent study of charge-exchange resonances and the impact on the symmetry energy parameters

NUCLEAR STRUCTURE 90Zr, 208Pb; calculated energy of the IAS and strength for 90Zr, single-particle proton levels in 208Pb, energy of the IAS as a function of neutron skin in 208Pb, energy difference between the anti-analog giant dipole resonance (AGDR) and the isobaric analog state; deduced correlations between the neutron-skin thickness and either the symmetry energy at saturation density or the corresponding slope parameter. HF+RPA calculations with the exchange term of the two-body Coulomb interaction treated exactly without Slater approximation, and the two-parameters spin-orbit interaction is treated in a consistent way within the energy density functional theory using several SAMi-J interactions. Comparison with available experimental information.

doi: 10.1103/PhysRevC.94.044313
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2016YA12      Phys.Rev. C 94, 034311 (2016)

C.J.Yang, M.Grasso, X.Roca-Maza, G.Colo, K.Moghrabi

Second-order equation of state with the Skyrme interaction: Cutoff and dimensional regularization with the inclusion of rearrangement terms

doi: 10.1103/PhysRevC.94.034311
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2015BA45      Phys.Rev. C 92, 035802 (2015)

D.Basilico, D.Pena Arteaga, X.Roca-Maza, G.Colo

Outer crust of a cold non-accreting magnetar

NUCLEAR STRUCTURE 56Fe, 62,68,77,78,79,98Ni, 77,78,79,80Zn, 81Ga, 82Ge, 84Se, 85,117Br, 86Kr, 87,119Rb, 88,120Sr, 121Y, 122Zr, 123Nb, 124Mo, 125Tc; calculated effects of magnetic field on the binding energies using NL3 and DD-ME2 relativistic mean-field models; deduced composition of the outer crust of a cold non-accreting and strongly magnetized neutron star.

doi: 10.1103/PhysRevC.92.035802
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2015CA20      Phys.Rev. C 92, 034308 (2015)

L.-G.Cao, X.Roca-Maza, G.Colo, H.Sagawa

Constraints on the neutron skin and symmetry energy from the anti-analog giant dipole resonance in 208Pb

NUCLEAR STRUCTURE 208Pb; calculated neutron skin thickness, energies of anti-analog giant dipole resonance (AGDR), isobaric analog state (IAS) and isovector giant dipole resonance (IVGDR). Droplet model, and fully self-consistent Hartree-Fock (HF) plus charge-exchange random phase approximation (RPA) framework. Comparison with experimental data.

doi: 10.1103/PhysRevC.92.034308
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2015CO05      Acta Phys.Pol. B46, 395 (2015)

G.Colo, X.Roca-Maza, N.Paar

The Nuclear Symmetry Energy and Other Isovector Observables from the Point of View of Nuclear Structure

NUCLEAR STRUCTURE 208Pb; analyzed available data; deduced the values of the Pearson-product correlation coefficient, covariance analysis.

doi: 10.5506/APhysPolB.46.395
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2015RO04      J.Phys.(London) G42, 034033 (2015)

X.Roca-Maza, N.Paar, G.Colo

Covariance analysis for energy density functionals and instabilities

doi: 10.1088/0954-3899/42/3/034033
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2015RO26      Phys.Rev. C 92, 064304 (2015)

X.Roca-Maza, X.Vinas, M.Centelles, B.K.Agrawal, G.Colo, N.Paar, J.Piekarewicz, D.Vretenar

Neutron skin thickness from the measured electric dipole polarizability in 68Ni, 120Sn, and 208Pb

NUCLEAR STRUCTURE 68Ni, 120Sn, 208Pb; calculated dipole polarizability, and dipole polarizability times the symmetry energy as a function of the neutron skin thickness using self-consistent random-phase approximation (QRPA) with a large set of energy density functionals (EDFs), and comparison to experimental data; deduced symmetry energy αD and its density dependence. 48Ca, 90Zr; deduced neutron skin thickness and electric dipole polarizability.

doi: 10.1103/PhysRevC.92.064304
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2014BR16      Phys.Rev. C 90, 044316 (2014)

M.Brenna, G.Colo, X.Roca-Maza

Regularization of zero-range effective interactions in finite nuclei

NUCLEAR STRUCTURE 16O; calculated total energy in the finite system, density profiles using momentum-independent Skyrme force to regularize zero-range effective interactions. Discussed problem of the validity of the perturbative approach in finite nuclei.

doi: 10.1103/PhysRevC.90.044316
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2014CO20      Phys.Scr. 89, 054006 (2014)

G.Colo, P.F.Bortignon, M.Brenna, X.Roca-Maza, E.Vigezzi, K.Moghrabi, M.Grasso, K.Mizuyama

Progress in nuclear structure beyond the mean-field approximation

NUCLEAR STRUCTURE 39,41Ca; calculated level density, spectroscopic factor, strength functions using nuclear density functional theory with particle-vibration coupling and other extensions. Compared with available data.

doi: 10.1088/0031-8949/89/5/054006
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2014VI01      Eur.Phys.J. A 50, 27 (2014)

X.Vinas, M.Centelles, X.Roca-Maza, M.Warda

Density dependence of the symmetry energy from neutron skin thickness in finite nuclei

COMPILATION 40Ca, 54,56,57Fe, 59Co, 58,60,64Ni, 90,96Zr, 106,116Cd, 116,120,124Sn, 124,126,128,130Te, 208Pb, 209Bi, 232Th, 238U; compiled, calculated neutron skin thickness vs symmetry energy slope parameter. 208Pb; compiled calculations of mean-field model of parity-violating asymmetry vs skin thickness vs symmetry energy ope parameter and vs central radius, surface difuseness vs central radii.

doi: 10.1140/epja/i2014-14027-8
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2014WA20      Phys.Rev. C 89, 064302 (2014)

M.Warda, M.Centelles, X.Vinas, X.Roca-Maza

Influence of the single-particle structure on the nuclear surface and the neutron skin

NUCLEAR STRUCTURE 40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70Ca, 48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78Ni, 90,92,94,96,98,100,102,104,106,108,110,112,114,116,118,120,122Zr, 132,134,136,138,140,142,144,146,148,150,152,154,156,158,160,162,164,166,168,170,172,174,176Sn, 208,210,212,214,216,218,220,222,224,226,228,230,232,234,236,238,240,242,244,246,248,250,252,254,256,258,260,262,264,266Pb; calculated proton and neutron rms radii, neutron skin thickness (NST), single-particle energies and Fermi level, configurations, rms radii, neutron, shell, and single-particle level densities and density ratios. Skyrme-Hartree-Fock plus BCS approach with the SLy4 Skyrme force. Discussed impact of the valence shell neutrons on the tail of the neutron density distributions.

doi: 10.1103/PhysRevC.89.064302
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2013BR03      Phys.Scr. T154, 014020 (2013)

M.Brenna, X.Roca-Maza, G.Colo, P.F.Bortignon, K.Mizuyama, G.Pozzi

Low-lying dipole response in stable and unstable nuclei

NUCLEAR STRUCTURE 68Ni, 132Sn, 208Pb; calculated total energy and rms charge radii, dipole response and strength functions, neutron and proton transition densities, RPA-pygmy states. Skyrme Hartree-Fock plus random phase approximation (RPA) predictions.

doi: 10.1088/0031-8949/2013/T154/014020
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2013RE12      Phys.Rev. C 88, 034325 (2013)

P.-G.Reinhard, J.Piekarewicz, W.Nazarewicz, B.K.Agrawal, N.Paar, X.Roca-Maza

Information content of the weak-charge form factor

NUCLEAR STRUCTURE 48Ca, 132Sn, 208Pb; calculated neutron rms radius, neutron skin, weak charge form factor, electric dipole polarizability. Statistical covariance analysis. Impact of proposed PREX-II and CREX measurements on constraining the isovector sector of the nuclear EDF. Nuclear density functional theory with nonrelativistic Skyrme-Hartree-Fock (SHF), relativistic mean-field (RMF), and relativistic density dependent meson-nucleon couplings (DDME) models.

doi: 10.1103/PhysRevC.88.034325
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2013RO02      Phys.Rev. C 87, 014304 (2013)

X.Roca-Maza, M.Centelles, F.Salvat, X.Vinas

Electron scattering in isotonic chains as a probe of the proton shell structure of unstable nuclei

NUCLEAR STRUCTURE 22O, 24Ne, 26Mg, 28Si, 30S, 32Ar, 34Ca, 70Ca, 84Se, 90Zr, 100Sn, 122Zr, 140Ce, 146Gd, 154Hf; calculated proton and neutron single-particle levels, and charge densities. Relativistic nuclear mean-field interaction G2.

NUCLEAR REACTIONS 122Zr, 140Ce, 154Hf(e, e), E=250, 500 MeV; calculated DWBA and Mott differential σ(θ, E). 22O, 24Ne, 26Mg, 28Si, 30S, 32Ar, 34Ca, 70Ca, 74Cr, 78Ni, 80Zn, 82Ge, 84Se, 86Kr, 88Sr, 90Zr, 92Mo, 94Ru, 96Pd, 98Cd, 100Sn, 120Sr, 122Zr, 128Pd, 132Sn, 136Xe, 140Ce, 142Nd, 144Sm, 146Gd, 148Dy, 150Er, 152Yb, 154Hf(e, e), E=500 MeV; calculated Helm model parameters, mass-number dependence of Helm parameters, square charge form factors as function of Helm parameters in DWBA. Dirac partial-wave approach, and covariant mean-field model G2.

doi: 10.1103/PhysRevC.87.014304
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2013RO08      Phys.Rev. C 87, 034301 (2013)

X.Roca-Maza, M.Brenna, B.K.Agrawal, P.F.Bortignon, G.Colo, L.-G.Cao, N.Paar, D.Vretenar

Giant quadrupole resonances in 208Pb, the nuclear symmetry energy, and the neutron skin thickness

NUCLEAR STRUCTURE 208Pb; calculated strength functions, neutron and proton transition densities, excitation energies of isoscalar and isovector giant quadrupole resonance (ISGQR and IVGQR), neutron skin thickness, symmetry energy. Macroscopic approach based on quantal harmonic oscillator model, and microscopic approach based on nonrelativistic and covariant energy density functionals (EDF) within the RPA. Comparison with experimental data.

doi: 10.1103/PhysRevC.87.034301
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2013RO15      Phys.Scr. T154, 014011 (2013)

X.Roca-Maza, G.Colo, H.Sagawa

New Skyrme energy density functional for a better description of the Gamow-Teller resonance

NUCLEAR STRUCTURE 40,48Ca, 90Zr, 132Sn, 208Pb; analyzed and fitted available data for binding energies, charge radii and the spin-orbit splittings; deduced Gamow-Teller resonance. Skyrme energy density functional (SAMi).

doi: 10.1088/0031-8949/2013/T154/014011
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2013RO20      Phys.Rev. C 88, 024316 (2013)

X.Roca-Maza, M.Brenna, G.Colo, M.Centelles, X.Vinas, B.K.Agrawal, N.Paar, D.Vretenar, J.Piekarewicz

Electric dipole polarizability in 208Pb: Insights from the droplet model

NUCLEAR STRUCTURE 208Pb; calculated electric dipole polarizability αD as function of neutron skin thickness, correlation between αD and symmetry energy, parity-violating asymmetry as function of αD. Droplet model. Large set of relativistic and nonrelativistic nuclear mean-field models with modern nuclear energy density functionals (EDF). Comparison with experimental data.

doi: 10.1103/PhysRevC.88.024316
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2012LI36      Phys.Rev. C 86, 021302 (2012)

H.Liang, P.Zhao, P.Ring, X.Roca-Maza, J.Meng

Localized form of Fock terms in nuclear covariant density functional theory

NUCLEAR STRUCTURE 90Zr, 208Pb; calculated Gamow-Teller resonance (GTR) and spin-dipole resonance (SDR) strength distributions. Relativistic Hartree-Fock (RHF) covariant density functional. Comparison with experimental data.

doi: 10.1103/PhysRevC.86.021302
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2012MO12      Phys.Rev. C 85, 044323 (2012); Erratum Phys.Rev. C 94, 069901 (2016)

K.Moghrabi, M.Grasso, X.Roca-Maza, G.Colo

Second-order equation of state with the full Skyrme interaction: Toward new effective interactions for beyond-mean-field models

doi: 10.1103/PhysRevC.85.044323
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2012PI06      Phys.Rev. C 85, 041302 (2012)

J.Piekarewicz, B.K.Agrawal, G.Colo, W.Nazarewicz, N.Paar, P.-G.Reinhard, X.Roca-Maza, D.Vretenar

Electric dipole polarizability and the neutron skin

NUCLEAR STRUCTURE 208Pb, 132Sn, 48Ca; analyzed correlation between neutron-skin thickness and electric dipole polarizability using ensemble of 48 nuclear energy density functionals. NL3/FSU, DD-ME, and Skyrme-SV models. Comparison with experimental data.

doi: 10.1103/PhysRevC.85.041302
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2012RO05      Phys.Rev. C 85, 024601 (2012)

X.Roca-Maza, G.Pozzi, M.Brenna, K.Mizuyama, G.Colo

Low-lying dipole response: Isospin character and collectivity in 68Ni, 132Sn, and 208Pb

NUCLEAR STRUCTURE 68Ni, 132Sn, 208Pb; calculated excitation energies of PDS, ISGDR and IVGDR, B(E1) strengths, neutron and proton transition densities, single particle levels for isoscalar and isovector transitions. Fully self-consistent nonrelativistic mean field (MF), Skyrme Hartree-Fock plus random phase approximation (RPA). Comparison with experimental data.

doi: 10.1103/PhysRevC.85.024601
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2012RO26      Phys.Rev. C 86, 031306 (2012)

X.Roca-Maza, G.Colo, H.Sagawa

New Skyrme interaction with improved spin-isospin properties

NUCLEAR STRUCTURE 16O, 40,48Ca, 56,68Ni, 90Zr, 100,132Sn, 208Pb; calculated binding energies, charge radii, proton spin-orbit splittings using the Skyrme-Aizu-Milano (SAMi) functional. 48Ca, 90Zr, 208Pb; calculated Gamow-Teller (GT) strength distributions and spin dipole resonance (SDR) strength functions using several Skyrme interactions. New Skyrme energy density functional proposed. Comparison with experimental data.

doi: 10.1103/PhysRevC.86.031306
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2012TS04      Phys.Rev. C 86, 015803 (2012)

M.B.Tsang, J.R.Stone, F.Camera, P.Danielewicz, S.Gandolfi, K.Hebeler, C.J.Horowitz, J.Lee, W.G.Lynch, Z.Kohley, R.Lemmon, P.Moller, T.Murakami, S.Riordan, X.Roca-Maza, F.Sammarruca, A.W.Steiner, I.Vidana, S.J.Yennello

Constraints on the symmetry energy and neutron skins from experiments and theory

NUCLEAR STRUCTURE 208Pb; analyzed neutron-skin thickness, symmetry energy constraints. Contributions of three-body forces in neutron matter models.

doi: 10.1103/PhysRevC.86.015803
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2012VI03      Int.J.Mod.Phys. E21, 1250029 (2012)

X.Vinas, M.Warda, M.Centelles, X.Roca-Maza

Neutron skin thickness in neutron-rich nuclei: Bulk and surface contributions and shell effects

NUCLEAR STRUCTURE 208Pb, 90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122Zr; calculated neutron skin thickness; deduced shell effects. Mean field models.

doi: 10.1142/S0218301312500292
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2012WA02      Acta Phys.Pol. B43, 209 (2012)

M.Warda, M.Centelles, X.Vinas, X.Roca-Maza

Nuclear Symmetry Energy and Neutron Skin Thickness

NUCLEAR STRUCTURE 208Pb; calculated neutron skin thickness, parity violating asymmetry parameters. Comparison with experimental data.

doi: 10.5506/APhysPolB.43.209
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2011RO17      Phys.Rev.Lett. 106, 252501 (2011)

X.Roca-Maza, M.Centelles, X.Vinas, M.Warda

Neutron Skin of 208Pb, Nuclear Symmetry Energy, and the Parity Radius Experiment

NUCLEAR STRUCTURE 208Pb; analyzed difference between neutron and proton rms radii, neutron skin; deduced a high linear correlation between parity-violating asymmetry and neutron skin. Parity radius experiment (PREX).

doi: 10.1103/PhysRevLett.106.252501
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2011RO50      Phys.Rev. C 84, 054309 (2011); Erratum Phys.Rev. C 93, 069905 (2016)

X.Roca-Maza, X.Vinas, M.Centelles, P.Ring, P.Schuck

Relativistic mean-field interaction with density-dependent meson-nucleon vertices based on microscopical calculations

NUCLEAR STRUCTURE 16,18,26,28,30Ne, 20,32Mg, 34,36Si, 36S, 38,40Ar, 36,38,40,42,44,46,48,50,52Ca, 40,42,44,48,50,52,54Ti, 46,52Cr, 54,64,66,68Fe, 54,56,58,66,68,70,72Ni, 58,70,72Zn, 82Ge, 84,86Se, 86,88Kr, 86,88,90Sr, 86,88,90,92Zr, 86,88,90,92,94Mo, 94,96Ru, 96,98Pd, 98,100Cd, 100,102,104,106,108,110,112,114,116,118,120,122,124,126,128,130,132,134Sn, 126,128,130,132,134,136Te, 134,136,138Xe, 136,138,140Ba, 138,140,142,144Ce, 140,142,144Nd, 142,144,146Sm, 146Gd, 148Dy, 150Er, 152Yb, 170,172Pt, 172,174,176,204,206Hg, 178,180,182,184,186,188,190,192,194,196,198,200,202,204,206,208,210,212,214Pb, 204,206,208,210,212,214,216Po, 208,210,212,214,216Rn, 210,212,214,216,218Ra, 212,214,216,218,220Th, 224U; analyzed binding energies, and charge radii. 100,132,176Sn; calculated isoscalar, isovector parts of the spin-orbit potential, spin orbit splitting. Relativistic Brueckner theory, high-precision density functional DD-MEδ with density-dependent meson-nucleon couplings. Comparison with experimental data.

doi: 10.1103/PhysRevC.84.054309
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2010CE01      J.Phys.(London) G37, 075107 (2010)

M.Centelles, S.K.Patra, X.Roca-Maza, B.K.Sharma, P.D.Stevenson, X.Vinas

The influence of the symmetry energy on the giant monopole resonance of neutron-rich nuclei analyzed in Thomas-Fermi theory

NUCLEAR STRUCTURE 90Zr, 208,266Pb; calculated neutron skin thickness, energy per particle, giant monopole resonance. Relativistic extended Thomas-Fermi method.

doi: 10.1088/0954-3899/37/7/075107
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2010CE02      Phys.Rev. C 82, 054314 (2010)

M.Centelles, X.Roca-Maza, X.Vinas, M.Warda

Origin of the neutron skin thickness of 208Pb in nuclear mean-field models

NUCLEAR STRUCTURE 208Pb; calculated neutron skin thickness, sharp radius, surface width, central radius and surface diffuseness of neutron and proton density distributions, and nucleon densities using Skyrme, Gogny and relativistic mean-field models with about 25 different interactions.

doi: 10.1103/PhysRevC.82.054314
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2010PI11      Eur.Phys.J. A 46, 379 (2010)

J.Piekarewicz, M.Centelles, X.Roca-Maza, X.Vinas

Garvey-Kelson relations for nuclear charge radii

NUCLEAR STRUCTURE Z=9-96; calculated charge radii using Garvey-Kelson algebraic expressions. Calculations compared to 455 measured radii, radii for Kr, Sn, Ba, Hg isotopes plotted explicitly together with other calculations.

doi: 10.1140/epja/i2010-11051-8
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2010WA13      Phys.Rev. C 81, 054309 (2010)

M.Warda, X.Vinas, X.Roca-Maza, M.Centelles

Analysis of bulk and surface contributions in the neutron skin of nuclei

NUCLEAR STRUCTURE 100,132Sn, 208Pb; Z=50, A=100-176; Z=82, A=168-268; calculated halo factor, neutron and proton densities, neutron skin thicknesses using Gogny, Skyrme, and covariant nuclear mean-field interactions. 40,48Ca, 54,56,57Fe, 58,60,64Ni, 59Co, 90,96Zr, 106,116Cd, 112,116,120,124Sn, 122,124,126,128,130Te, 208Pb, 209Bi, 232Th, 238U; analyzed experimental neutron skin thicknesses with results of the covariant NL3 and FSUGold parameter sets of the nonrelativistic Skyrme SLy4 and Gogny D1S forces.

doi: 10.1103/PhysRevC.81.054309
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2009CE01      Phys.Rev.Lett. 102, 122502 (2009)

M.Centelles, X.Roca-Maza, X.Vinas, M.Warda

Nuclear Symmetry Energy Probed by Neutron Skin Thickness of Nuclei

doi: 10.1103/PhysRevLett.102.122502
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2009WA14      Phys.Rev. C 80, 024316 (2009)

M.Warda, X.Vinas, X.Roca-Maza, M.Centelles

Neutron skin thickness in the droplet model with surface width dependence: Indications of softness of the nuclear symmetry energy

NUCLEAR STRUCTURE A=40-238; analyzed neutron skin thickness, its correlation with ratio of bulk symmetry energy to surface stiffness coefficient (J/Q) and neutron excess (N-Z)/A using the droplet model and effective nuclear interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.80.024316
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2008RO20      Phys.Rev. C 78, 025807 (2008)

X.Roca-Maza, J.Piekarewicz

Impact of the symmetry energy on the outer crust of nonaccreting neutron stars

doi: 10.1103/PhysRevC.78.025807
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2008RO26      Phys.Rev. C 78, 044332 (2008)

X.Roca-Maza, M.Centelles, F.Salvat, X.Vinas

Theoretical study of elastic electron scattering off stable and exotic nuclei

NUCLEAR REACTIONS 16O, 40,42,44,48Ca, 48Ti, 90Zr, 116,118,124,132,176Sn, 208Pb(e, e), E=225, 250, 500 MeV; calculated charge densities, σ(θ), form factors. Skyrme forces and effective Lagrangians.

doi: 10.1103/PhysRevC.78.044332
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