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Search: Author = O.Civitarese

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2023CI02      Universe 9, 275 (2023)


The Neutrino Mass Problem: From Double Beta Decay to Cosmology

doi: 10.3390/universe9060275
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2023YE01      Nucl.Phys. A1029, 122566 (2023)

T.Yepez-Martinez, P.O.Hess, O.Civitarese

BCS solutions and effective quark energies of the QCD Hamiltonian in the Coulomb gauge

doi: 10.1016/j.nuclphysa.2022.122566
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2022PE08      Int.J.Mod.Phys. E31, 2250038 (2022)

A.V.Penacchioni, O.Civitarese

Constraining the axion mass from the nonobservation of Oνββ decay

doi: 10.1142/S0218301322500380
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2021MA81      Phys.Rev. C 104, L061304 (2021)

A.O.Macchiavelli, O.Civitarese, S.M.Lenzi, R.J.Liotta, D.R.Bes

"Piston" mechanism in a time-dependent two-level model

NUCLEAR STRUCTURE 19N; analyzed one-proton knockout reaction on 19N. populating unbound state in 18C, in the framework of a time-dependent two-level model. 18C; calculated wave functions of g.s. and the first two 2+ states; quantified validity of the so-called 'piston' mechanism (proposed by 2018Re06: Phys. Rev. Lett. 120, 152504) in terms of time scales involved in the process, reaction time, period of oscillation between the mixed states, and the lifetime of the excited unbound state in 18C.

doi: 10.1103/PhysRevC.104.L061304
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2021SA21      Int.J.Mod.Phys. E30, 2150028 (2021)

M.M.Saez, K.J.Fushimi, M.E.Mosquera, O.Civitarese

Limits on active-sterile neutrino mixing parameters using heavy nuclei abundances

doi: 10.1142/S0218301321500282
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2020FU06      Int.J.Mod.Phys. E29, 2050072 (2020)

K.Fushimi, M.E.Mosquera, O.Civitarese

MSSM WIMPs-Nucleon cross-section for Ex < 500 GeV

doi: 10.1142/S021830132050072X
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2020ME05      Phys.Rev. C 101, 035806 (2020)

B.E.Melendez, M.E.Mosquera, O.Civitarese

Cross sections of ultrahigh-energy neutrinos: Comparison with ICE-CUBE data

doi: 10.1103/PhysRevC.101.035806
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2020MO30      Phys.Rev. C 102, 025803 (2020)

M.E.Mosquera, O.Civitarese

Cross section of ultrahigh-energy neutrinos: Estimation of the uncertanties due to parton distribution functions

NUCLEAR REACTIONS 12C(ν, ν'), (ν, X), (ν-bar, ν-bar'), (ν-bar, X), E=0.3-32000 TeV; calculated σ(E) for charged and neutral currents, and total neutrino scattering σ(E) by included the uncertainties of the parton distribution function. Comparison with the IceCube experimental data.

doi: 10.1103/PhysRevC.102.025803
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2019BE10      Nucl.Phys. A983, 53 (2019)

D.R.Bes, O.Civitarese

The contribution of the pairing field to the transfer of two nucleons

NUCLEAR STRUCTURE A=110-124; calculated two-nucleon pairing transfer amplitude vs distance of the centers, moment of inertia for pairing rotational motion using radial-dependent BCS approach; deduced its mass dependence.

doi: 10.1016/j.nuclphysa.2018.12.026
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2019CI04      Phys.Rev. C 99, 065504 (2019)

O.Civitarese, T.Tarutina

Multipole decomposition of the rate of muon-to-electron (μ → e-) conversion in 208Pb

NUCLEAR STRUCTURE 208Pb; calculated levels, J, π, radial nuclear density, and radial wave function, nuclear matrix elements, and multipole decomposition of muon to electron conversion in the 208Pb nucleus, by considering the most general effective Lagrangian responsible for the lepton-flavor violation, and by performing a diagonalization of the δ-force interaction in the space of particle-hole pairs for neutrons and protons for the level spectrum of 208Pb.

doi: 10.1103/PhysRevC.99.065504
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2018KO29      Phys.Rev. C 98, 065504 (2018)

J.Kostensalo, J.Suhonen, O.Civitarese

Muon-electron lepton-flavor-violating transitions: Shell-model calculations of transitions in 27Al

NUCLEAR STRUCTURE 27Al; calculated levels, J, π, single-particle occupation factors for active proton and neutron orbitals, vector and axial matrix elements of muon-to-electron conversion. Large-scale shell-model calculations of muon-to-electron lepton-flavor violating transitions in 27Al target. Comparison with experimental level structure of 27Al.

doi: 10.1103/PhysRevC.98.065504
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2018YE02      Eur.Phys.J. A 54, 22 (2018)

T.Yepez-Martinez, O.Civitarese, P.O.Hess

Non-perturbative RPA-method implemented in the Coulomb gauge QCD Hamiltonian: From quarks and gluons to baryons and mesons

doi: 10.1140/epja/i2018-12424-7
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2017CI04      Phys.Rev. C 95, 054307 (2017)

O.Civitarese, M.Reboiro, D.Tielas

Applicability of the Richardson method in a complex-energy basis: Fermionic case

doi: 10.1103/PhysRevC.95.054307
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2017GU17      Phys.Rev. C 96, 014319 (2017)

V.Guadilla, A.Algora, J.L.Tain, J.Agramunt, D.Jordan, A.Montaner-Piza, S.E.A.Orrigo, B.Rubio, E.Valencia, J.Suhonen, O.Civitarese, J.Aysto, J.A.Briz, A.Cucoanes, T.Eronen, M.Estienne, M.Fallot, L.M.Fraile, E.Ganioglu, W.Gelletly, D.Gorelov, J.Hakala, A.Jokinen, A.Kankainen, V.Kolhinen, J.Koponen, M.Lebois, T.Martinez, M.Monserrate, I.Moore, E.Nacher, H.Penttila, I.Pohjalainen, A.Porta, J.Reinikainen, M.Reponen, S.Rinta-Antila, K.Rytkonen, T.Shiba, V.Sonnenschein, A.A.Sonzogni, V.Vedia, A.Voss, J.N.Wilson, A.-A.Zakari-Issoufou

Experimental study of 100Tc β decay with total absorption γ-ray spectroscopy

RADIOACTIVITY 100Tc(β-)[from 100Mo(p, n), E=8 MeV]; measured Eγ, Iγ, β spectrum using a vase-shaped plastic scintillator, βγ-coin, total absorption TAGS γ spectra using Decay Total Absorption γ-ray Spectrometer (DTAS), IGISOL-IV mass separator and JYFLTRAP Penning trap at the University of Jyvaskyla cyclotron facility; deduced β-intensity distribution extracted from the TAGS analysis, β feedings to g.s. and excited states of 100Ru, logft. Comparison with high-resolution decay data in the ENSDF database at NNDC-BNL, and with quasiparticle random-phase approximation calculations. Benchmark for calculations of the double β decay of 100Mo.

doi: 10.1103/PhysRevC.96.014319
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2017MO36      Phys.Rev. C 96, 045802 (2017)

M.E.Mosquera, O.Civitarese

Time variation of fundamental constants in nonstandard cosmological models

doi: 10.1103/PhysRevC.96.045802
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2017RE07      Phys.Scr. 92, 094004 (2017)

M.Reboiro, O.Civitarese, R.Ramirez, D.Tielas

Use of discrete Wigner functions in the study of a hybrid dissipative system

doi: 10.1088/1402-4896/aa8079
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2016CI06      Int.J.Mod.Phys. E25, 1650081 (2016)

O.Civitarese, J.Suhonen, K.Zuber

Combining data from high-energy pp-reactions and neutrinoless double-beta decay: Limits on the mass of the right-handed boson

RADIOACTIVITY 76Ge, 136Xe(2β-); analyzed available data; deduced limits on the mass of the right-handed boson.

doi: 10.1142/S0218301316500816
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2016CI07      Phys.Rev. C 94, 054603 (2016)

O.Civitarese, T.Tarutina

Multipole decomposition of the cross section of the neutrino-lead scattering process 208Pb(g.s.)(ν, ν')208Pb

NUCLEAR REACTIONS 208Pb(ν, ν'), E=150 MeV; calculated contribution of neutral-current part of the neutrino-lead interaction to the cross section as a function of neutrino energy and for different eignestates of 208Pb.

NUCLEAR STRUCTURE 208Pb; calculated levels, J, π using δ-force interaction, and compared with experimental values.

doi: 10.1103/PhysRevC.94.054603
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2014CI01      Phys.Rev. C 89, 044319 (2014)

O.Civitarese, J.Suhonen

Strength of Jπ = 1 + Gamow-Teller and isovector spin monopole transitions in double-β-decay triplets

RADIOACTIVITY 76Ge, 82Se, 100Mo, 116Cd, 128,130Te, 136Xe(2β-); calculated pairing scaling factors, pairing gaps, distribution of Gamow-Teller (GT-) and isovector spin monopole transition strengths (IVSM-), particle-hole and particle-particle interactions in the 1+ channel, energy of the first pnQRPA eigenvalue, energetics, intensities and amplitudes of the GT-, GT+, IVSM-, IVSM+ modes, cumulative strengths. Realistic pnQRPA calculations of the GT and IVSM excitations in double-odd intermediate mass nuclei 76As, 82Br, 100Tc, 116In, 128,130I, 136Cs. Relevance to (p, n) strengths in the 10-20 MeV excitation region.

doi: 10.1103/PhysRevC.89.044319
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2014SU06      Nucl.Phys. A924, 1 (2014)

J.Suhonen, O.Civitarese

Single and double beta decays in the A=100, A=116 and A=128 triplets of isobars

RADIOACTIVITY 100Mo, 100Tc, 100Ru, 116Cd, 116In, 116Sn, 128Te, 128I, 128Xe(β-);100Mo, 116Cd, 128Te(2β-); calculated mean-field orbitals proton orbitals energy, pairing, β decay, 2β decay nuclear matrix elements, gA coupling constant, B(GT), effective strength function using pnQRPA. Compared with other calculations.

doi: 10.1016/j.nuclphysa.2014.01.004
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2013CI01      Nucl.Phys. A898, 1 (2013)

O.Civitarese, M.E.Mosquera

Nuclear structure constrains on resonant energies: A solution of the cosmological 7Li problem?

NUCLEAR REACTIONS 7Be(d, pα), (n, p), (α, γ), E not given (low); calculated freeze-out temperature, resonance energy, 7Li, Be cosmic abundance using semi-analytical solution of balance equations.

doi: 10.1016/j.nuclphysa.2012.11.012
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2013SU19      Phys.Lett. B 725, 153 (2013)

J.Suhonen, O.Civitarese

Probing the quenching of gA by single and double beta decays

RADIOACTIVITY 100Mo, 116Cd, 128Te(2β-); calculated nuclear matrix elements, decay parameters. Proton-neutron quasiparticle random-phase approximation exploiting realistic effective interactions in very large single-particle bases.

doi: 10.1016/j.physletb.2013.06.042
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2012BE25      Phys.Rev. C 86, 024314 (2012)

D.R.Bes, O.Civitarese, J.Suhonen

Schematic and realistic model calculations of the isovector spin monopole excitations in 116In

NUCLEAR REACTIONS 116Cd(p, n)116In, 116Sn(n, p)116In, E not given; calculated Gamow-Teller (GT) and isovector spin monopole (IVSM) strength distributions of 1+ excitations; deduced mixing between GT and IVSM modes, and contribution to 2νββ decay of 116Cd at and beyond the Gamow-Teller giant resonance (GTGR) region of energies.

doi: 10.1103/PhysRevC.86.024314
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2012CI04      Phys.Rev. C 86, 024602 (2012)

O.Civitarese, M.Gadella

Analyticity of the time dependence of resonance poles: Solving the Friedrichs model with a time-dependent interaction

doi: 10.1103/PhysRevC.86.024602
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2012CI06      J.Phys.:Conf.Ser. 387, 012007 (2012)

O.Civitarese, J.Suhonen

Nuclear and weak interaction aspects of neutrinoless double beta decay: recent results

doi: 10.1088/1742-6596/387/1/012007
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2012SU12      J.Phys.(London) G39, 085105 (2012)

J.Suhonen, O.Civitarese

Double-beta-decay nuclear matrix elements in the QRPA framework

RADIOACTIVITY 74Se, 96Ru, 102Pd, 106Cd, 112Sn, 136Ce, 144Sm, 152Gd, 156Dy, 162Er, 168Yb(2EC), 70Zn, 86Kr, 94Zr, 104Ru, 110Pd, 124Sn, 76Ge, 82Se, 96Zr, 116Cd, 100Mo, 128,130Te, 136Xe(2β-); calculated nuclear matrix elements. QRPA framework.

doi: 10.1088/0954-3899/39/8/085105
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2012SU24      J.Phys.(London) G39, 124005 (2012)

J.Suhonen, O.Civitarese

Review of the properties of the 0νβ-β- nuclear matrix elements

RADIOACTIVITY 48Ca, 76Ge, 82Se, 96Zr, 100Mo, 110Pd, 116Cd, 124Sn, 128,130Te, 136Xe(2β-); calculated neutrinoless nuclear matrix elements. pnQRPA, IBA-2, ISM(J) methods.

doi: 10.1088/0954-3899/39/12/124005
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2011MO31      Phys.Rev. C 84, 065803 (2011)

M.E.Mosquera, O.Civitarese

Constraints on active-sterile neutrino mixing from primordial abundances

NUCLEAR STRUCTURE 2H, 4He, 7Li; calculated primordial abundance using a modified version of Kawano's code by including mixing between active and sterile neutrinos.

doi: 10.1103/PhysRevC.84.065803
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2010BE02      Phys.Rev. C 81, 014315 (2010)

D.R.Bes, O.Civitarese

Matrix elements for the ground-state to ground-state 2νβ-β- decay of Te isotopes in a hybrid model

RADIOACTIVITY 128,130Te(2β-); calculated matrix elements for ground state to ground state two-neutrino double-β decay within a formalism that describes interactions between neutrons in a superfluid phase and protons in a normal phase. Comparison with experimental data.

doi: 10.1103/PhysRevC.81.014315
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2010CI02      Nucl.Phys. A846, 157 (2010)

O.Civitarese, M.A.Moline, M.E.Mosquera

Cosmological bounds to the variation of the Higgs vacuum expectation value: BBN constraints

doi: 10.1016/j.nuclphysa.2010.06.011
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2010SU29      Nucl.Phys. A847, 207 (2010)

J.Suhonen, O.Civitarese

Effects of orbital occupancies and spin-orbit partners on 0νββ-decay rates

RADIOACTIVITY 76Ge, 82Se, 128,130Te, 136Xe(2β); calculated single-particle energies, nuclear matrix elements for neutrinoless 2β-decay. Comparison of various models and data.

doi: 10.1016/j.nuclphysa.2010.08.003
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2010YE03      Phys.Rev. C 81, 045204 (2010)

T.Yepez-Martinez, P.O.Hess, A.P.Szczepaniak, O.Civitarese

Solvable model for many-quark systems in QCD Hamiltonians

doi: 10.1103/PhysRevC.81.045204
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2008BE23      Phys.Rev. C 78, 014317 (2008)

D.R.Bes, O.Civitarese

Isospin-spin excitations in the A = 58 mass region: The 58Ni(3He, t)58Cu reaction

NUCLEAR REACTIONS 58Ni(3He, t), E not given; calculated GT matrix elements.A=52-59; analyzed levels, J, π, configurations. Perturbation theory.

doi: 10.1103/PhysRevC.78.014317
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2008CI03      Int.J.Mod.Phys. E17, 493 (2008)

O.Civitarese, S.J.Landau, M.E.Mosquera

Double beta decay rates as test of the time variation of fundamental constants

doi: 10.1142/S0218301308009847
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2008CI04      Int.J.Mod.Phys. E17, 351 (2008)

O.Civitarese, M.E.Mosquera

Study of the compatibility of LSND and WMAP data

doi: 10.1142/S0218301308006156
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2008CI05      Phys.Rev. C 77, 045806 (2008)

O.Civitarese, M.E.Mosquera

Testing primordial abundances with sterile neutrinos

NUCLEAR STRUCTURE 2H, 3,4He, 7Li; calculated abundances, big-bang model. Comparison with experimental data.

doi: 10.1103/PhysRevC.77.045806
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2008CI06      Phys.Rev. C 78, 064308 (2008)

O.Civitarese, R.J.Liotta, M.E.Mosquera

Effects of resonant and continuum states on the neutrino-nucleus cross section

NUCLEAR REACTIONS 208Pb(ν, e-), E<200 MeV; calculated σ, level energies, multipolarities.

doi: 10.1103/PhysRevC.78.064308
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2008SU17      Phys.Lett. B 668, 277 (2008)

J.Suhonen, O.Civitarese

Effects of orbital occupancies on the neutrinoless ββ matrix element of 76Ge

RADIOACTIVITY 76As(β-); calculated log ft. compared results to data.76Ge(2β-); calculated nuclear matrix elements using the QRPA formalism.

doi: 10.1016/j.physletb.2008.08.056
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2007BA33      Phys.Rev. C 75, 044316 (2007)

A.Ballesteros, O.Civitarese, F.J.Herranz, M.Reboiro

Generalized rotational Hamiltonians from nonlinear angular momentum algebras

doi: 10.1103/PhysRevC.75.044316
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2007CI06      Phys.Rev. C 76, 024303 (2007)

O.Civitarese, J.G.Hirsch, A.Mariano, M.Reboiro

Testing approximations beyond the proton-neutron quasiparticle random phase approximation

doi: 10.1103/PhysRevC.76.024303
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2007KO34      Phys.Lett. B 647, 128 (2007)

M.Kortelainen, O.Civitarese, J.Suhonen, J.Toivanen

Short-range correlations and neutrinoless double beta decay

RADIOACTIVITY 48Ca, 76Ge(2β-); calculated multipole and total 0ν2β-decay matrix elements. Shell model and quasi-particle RPA.

doi: 10.1016/j.physletb.2007.01.054
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2006CI01      Phys.Rev. C 73, 034306 (2006)

O.Civitarese, H.B.Geyer, M.Reboiro

Dyson boson mapping of effective bi-fermion Hamiltonians

doi: 10.1103/PhysRevC.73.034306
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2006CI02      Czech.J.Phys. 56, 447 (2006)

O.Civitarese, J.Suhonen

Neutrinoless ββ decay and the electron neutrino mass

RADIOACTIVITY 48Ca, 76Ge, 82Se, 96Zr, 100Mo, 116Cd, 128,130Te, 136Xe(2β-); analyzed 0νββ-decay matrix elements, neutrino mass limits.

doi: 10.1007/s10582-006-0107-5
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2006CI03      Int.J.Mod.Phys. E15, 1273 (2006)

O.Civitarese, M.Gadella

The Friedrichs-Model with Fermion-Boson couplings

doi: 10.1142/S0218301306004776
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2006PA22      Czech.J.Phys. 56, 481 (2006)

P.Papakonstantinou, J.Wambach, O.Civitarese, T.S.Kosmas

The role of the continuum and the spurious 1- transitions in incoherent μ--e- conversion rate calculations

NUCLEAR REACTIONS 40Ca, 208Pb(μ-, e), E at rest; calculated conversion rates, strength distributions. Self-consistent continuum RPA, Skyrme interactions.

doi: 10.1007/s10582-006-0112-8
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2005BA62      Phys.Rev. C 72, 014305 (2005)

A.Ballesteros, O.Civitarese, M.Reboiro

Nonstandard q-deformed realizations of the harmonic oscillator

doi: 10.1103/PhysRevC.72.014305
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2005CI02      Phys.Rev. C 71, 14318 (2005)

O.Civitarese, M.Reboiro, J.G.Hirsch

Test of consistency of the so-called fully renormalized quasiparticle random phase approximation

doi: 10.1103/PhysRevC.71.014318
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2005CI05      Phys.Lett. B 626, 80 (2005)

O.Civitarese, J.Suhonen

Universal features of the nuclear matrix elements governing the mass sector of the 0νββ decay

RADIOACTIVITY 76Ge, 82Se, 100Mo, 116Cd(2β-); analyzed multipole contributions; deduced 0ν-accompanied 2β-decay matrix elements.

doi: 10.1016/j.physletb.2005.08.107
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2005CI06      Nucl.Phys. A761, 313 (2005)

O.Civitarese, J.Suhonen

Extracting information on the 0νββ decays from the 2νββ decays

RADIOACTIVITY 76Ge, 82Se, 100Mo, 116Cd(2β-); calculated 0νββ- and2νββ-decay matrix elements. Quasiparticle RPA, multipole decomposition.

doi: 10.1016/j.nuclphysa.2005.07.017
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2004BE03      Nucl.Phys. A732, 49 (2004)

D.R.Bes, O.Civitarese

Isospin-symmetry violation. Collective treatment of the I.A.S.

NUCLEAR STRUCTURE 208Pb, 208Bi; calculated analog states energies, Fermi transition intensities, isospin symmetry violation effects.

doi: 10.1016/j.nuclphysa.2003.12.008
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2004BE33      Nucl.Phys. A741, 60 (2004)

D.R.Bes, O.Civitarese

The coupling between the IAS and the IMS

doi: 10.1016/j.nuclphysa.2004.06.019
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2004CI04      Phys.Rep. 396, 41 (2004)

O.Civitarese, M.Gadella

Physical and mathematical aspects of Gamow states

doi: 10.1016/j.physrep.2004.03.001
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2004CI06      Yad.Fiz. 67, 1228 (2004); Phys.Atomic Nuclei 67, 1206 (2004)

O.Civitarese, J.Suhonen

Neutrino Masses, Nuclear Matrix Elements, and the Oνββ Decay of 76Ge

RADIOACTIVITY 76Ge(2β-); analyzed neutrino mass data; deduced 0ν-accompanied 2β decay matrix elements, T1/2 lower limit.

doi: 10.1134/1.1772461
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2004NU02      Phys.Rev. C 70, 025201 (2004)

M.Nunez, S.Lerma, P.O.Hess, S.Jesgarz, O.Civitarese, M.Reboiro

Modeling pentaquark and heptaquark states

doi: 10.1103/PhysRevC.70.025201
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2004NU03      Phys.Rev. C 70, 035208 (2004)

M.V.Nunez, S.H.Lerma, P.O.Hess, S.Jesgarz, O.Civitarese, M.Reboiro

Schematic model for QCD. III. Hadronic states

doi: 10.1103/PhysRevC.70.035208
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2003BA93      Phys.Rev. C 68, 044307 (2003)

A.Ballesteros, O.Civitarese, M.Reboiro

Correspondence between the q-deformed harmonic oscillator and finite range potentials

doi: 10.1103/PhysRevC.68.044307
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2003BE20      Yad.Fiz. 66, 466 (2003); Phys.Atomic Nuclei 66, 438 (2003)

D.R.Bes, O.Civitarese

Symmetry Violations in Nuclear Hamiltonians and Their Consequences for Electroweak Decays

doi: 10.1134/1.1563701
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2003CI01      Eur.Phys.J. A 16, 353 (2003)

O.Civitarese, J.Suhonen, H.Ejiri

Perturbative analysis of the 2νββ decays of 100Mo and 116Cd

RADIOACTIVITY 100Mo, 116Cd(2β-); calculated 2ν-accompanied 2β-decay matrix elements. Perturbative approach, quasiparticle RPA.

doi: 10.1140/epja/i2002-10100-3
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2003CI05      Nucl.Phys. A729, 867 (2003)

O.Civitarese, J.Suhonen

Light-neutrino mass spectrum, nuclear matrix elements, and the observability of neutrinoless ββ decay

RADIOACTIVITY 48Ca, 76Ge, 82Se, 96Zr, 100Mo, 116Cd, 124Sn, 128,130Te, 136Xe, 150Nd(2β); analyzed 0ν-accompanied 2β-decay data, neutrino mass limits. Observability of decay discussed.

doi: 10.1016/j.nuclphysa.2002.10.004
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2003JE03      Phys.Rev. C 67, 055210 (2003)

S.Jesgarz, S.Lerma, P.O.Hess, O.Civitarese, M.Reboiro

Schematic model for QCD. II. Finite temperature regime

doi: 10.1103/PhysRevC.67.055210
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2003LE09      Phys.Rev. C 67, 055209 (2003)

S.Lerma, S.Jesgarz, P.O.Hess, O.Civitarese, M.Reboiro

Schematic model for QCD. I. Low energy meson states

doi: 10.1103/PhysRevC.67.055209
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2002BB05      Phys.Rev. C 66, 064317 (2002)

A.Ballesteros, O.Civitarese, F.J.Herranz, M.Reboiro

Fermion-boson interactions and quantum algebras

doi: 10.1103/PhysRevC.66.064317
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2002BE38      Nucl.Phys. A705, 297 (2002)

D.R.Bes, O.Civitarese

Collective Motion in Iso- and Gauge-Spaces Application to 2νββ-Decay Transitions

RADIOACTIVITY 76Ge(2β-); calculated 2ν-accompanied 2β-decay Gamow-Teller transition matrix elements.

doi: 10.1016/S0375-9474(02)00655-3
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2002BE43      Czech.J.Phys. 52, 481 (2002)

D.R.Bes, O.Civitarese

The Calculation of 2νββ Matrix Elements within the Collective Description

doi: 10.1023/A:1015301125199
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2002BE44      Czech.J.Phys. 52, 495 (2002)

D.R.Bes, O.Civitarese

Spurious Center of Mass Effects in Electroweak Decays

doi: 10.1023/A:1015353109269
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2002HI06      Phys.Lett. 534B, 57 (2002)

J.G.Hirsch, O.Castanos, P.O.Hess, O.Civitarese

Selection Rules in the ββ Decay of Deformed Nuclei

RADIOACTIVITY 154Sm, 160Gd, 170Er, 176Yb, 232Th, 244Pu(2β-); calculated 2ν- and 0ν-accompanied 2β-decay T1/2, deformation effects.

doi: 10.1016/S0370-2693(02)01593-9
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2002HI09      Czech.J.Phys. 52, 513 (2002)

J.G.Hirsch, O.Castanos, P.O.Hess, V.E.Ceron, O.Civitarese

Double-Beta Decay in Deformed Nuclei

RADIOACTIVITY 146,148,150Nd, 160Gd, 186W, 192Os, 238U(2β-); 156Dy, 162Er, 168Yb(2EC); calculated 0ν- and 2ν-accompanied 2β-decay T1/2. Pseudo-SU(3) model, deformed nuclei.

doi: 10.1023/A:1015357210178
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2002HI12      Phys.Rev. C66, 015502 (2002)

J.G.Hirsch, O.Castanos, P.O.Hess, O.Civitarese

Theoretical Description of Double β Decay of 160Gd

RADIOACTIVITY 160Gd(2β-); calculated 0ν- and 2ν-accompanied 2β decay matrix elements, T1/2. Pseudo-SU(3) model with pairing interaction.

doi: 10.1103/PhysRevC.66.015502
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2002HI13      Eur.Phys.J. A 14, 355 (2002)

J.G.Hirsch, P.O.Hess, O.Civitarese

The Use of Coherent States in the Variational Treatment of Proton-Neutron Interactions

doi: 10.1140/epja/i2002-10029-5
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2002LE28      Phys.Rev. C66, 045207 (2002)

S.Lerma, S.Jesgarz, P.O.Hess, O.Civitarese, M.Reboiro

Schematic model for QCD at finite temperature

doi: 10.1103/PhysRevC.66.045207
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2001BE14      Phys.Rev. C63, 044323 (2001)

D.R.Bes, O.Civitarese

Removal of Spurious Center of Mass Effects in Nuclear Many-Body Systems

doi: 10.1103/PhysRevC.63.044323
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2001CI01      Phys.Rev. C63, 034323 (2001)

O.Civitarese, M.Reboiro

Gamow-Teller Transitions at Finite Temperatures in the Extended Quasiparticle Random Phase Approximation

NUCLEAR STRUCTURE 106Cd; calculated Gamow-Teller transition strength distribution. Extended quasiparticle RPA, finite temperature blocking effects.

doi: 10.1103/PhysRevC.63.034323
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2001CI05      Eur.Phys.J. A 11, 263 (2001)

O.Civitarese, F.Montani, M.Reboiro

Application of the Dyson Boson Expansion Method to the Treatment of the Pairing Force

doi: 10.1007/s100500170063
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2001CI06      Phys.Rev. C64, 054317 (2001)

O.Civitarese, M.Reboiro, S.Jesgarz, P.O.Hess

Coherent States and the Calculation of Nuclear Partition Functions

doi: 10.1103/PhysRevC.64.054317
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2001CI07      Phys.Rev. C64, 057305 (2001)

O.Civitarese, R.J.Liotta, T.Vertse

Temperature Dependent BCS-Gap Equations in the Continuum

NUCLEAR STRUCTURE Z=50-112; calculated quasiparticle energies, pair gaps for N=50, 114. 106Ba, 204Th; calculated pair gap vs temperature. Suitability of BCS method near proton drip line discussed.

doi: 10.1103/PhysRevC.64.057305
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2001CI08      Phys.Rev. C64, 064312 (2001)

O.Civitarese, J.Suhonen

Theoretical Analysis of the Second-Forbidden Electron Capture Transition 123Te(1/2g.s.+) → 123Sb(7/2g.s.+)

RADIOACTIVITY 122Sb(β-); calculated transitions logft. 123Te(EC); calculated transition matrix elements. Proton-neutron quasiparticle RPA, comparisons with data.

doi: 10.1103/PhysRevC.64.064312
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2001SU01      Phys.Lett. 497B, 221 (2001)

J.Suhonen, O.Civitarese

Theoretical Results on the Double Positron Decay of 106Cd

RADIOACTIVITY 106Cd(2β+), (β+EC), (2EC); calculated 2ν-accompanied decay T1/2, decay branching ratios. Comparison with data.

NUCLEAR STRUCTURE 106Cd, 106Pd; calculated levels, J, π.

doi: 10.1016/S0370-2693(00)01324-1
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2000BE02      Phys.Rev. C61, 024315 (2000)

D.R.Bes, O.Civitarese, E.E.Maqueda, N.N.Scoccola

Structure of the Vacuum States in the Presence of Isovector and Isoscalar Pairing Correlations

doi: 10.1103/PhysRevC.61.024315
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2000CI02      Phys.Lett. 482B, 368 (2000)

O.Civitarese, J.Suhonen

Questioning Model-Independent Estimates of 2 νββ Decay Rates

RADIOACTIVITY 76Ge, 82Se, 96Zr, 100Mo, 116Cd(2β-); analyzed previous results for 2ν accompanied 2β-decay; deduced no model independence.

doi: 10.1016/S0370-2693(00)00462-7
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2000CI03      Phys.Rev. C61, 064303 (2000)

O.Civitarese, P.O.Hess, J.G.Hirsch, M.Reboiro

Fermion and Boson Condensates in a QCD-Inspired Model Hamiltonian

doi: 10.1103/PhysRevC.61.064303
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2000CI04      Phys.Rev. C61, 064306 (2000)

O.Civitarese, F.Montani, M.Reboiro, H.Toki

Spontaneous Symmetry Breaking and the Energy of Nuclear Isobaric Analog States

NUCLEAR STRUCTURE 90,92,94Nb, 100Tc, 116In, 124Sb, 169Yb, 208Bi; calculated IAS energies, role of symmetry breaking, ρ-meson exchange mechanism.

doi: 10.1103/PhysRevC.61.064306
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2000CI06      Phys.Rev. C62, 054318 (2000)

O.Civitarese, J.G.Hirsch, F.Montani, M.Reboiro

Extended Quasiparticle Random Phase Approximation at Finite Temperatures: Calculation of single β-decay Fermi transitions

RADIOACTIVITY 76Ge(β-); calculated Fermi transitions sum rule, strength distributions, temperature effects. Extended quasiparticle RPA.

doi: 10.1103/PhysRevC.62.054318
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2000SA14      Phys.Rev. C61, 044317 (2000)

N.Sandulescu, O.Civitarese, R.J.Liotta

Temperature Dependent BCS Equations with Continuum Coupling

doi: 10.1103/PhysRevC.61.044317
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1999BE03      Phys.Lett. 446B, 93 (1999)

D.R.Bes, O.Civitarese, N.N.Scoccola

Collective Description of Nuclear Double Beta Decay Transitions

doi: 10.1016/S0370-2693(98)01520-2
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1999CI01      Phys.Rev. C59, 194 (1999)

O.Civitarese, P.O.Hess, J.G.Hirsch, M.Reboiro

Spontaneous and Dynamical Breaking of Mean Field Symmetries in the Proton-Neutron Quasiparticle Random Phase Approximation and the Description of Double β Decay Transitions

NUCLEAR STRUCTURE 76Ge; calculated 2ν-accompanied 2β-decay matrix elements. Isospin symmetry breaking.

doi: 10.1103/PhysRevC.59.194
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1999CI04      Phys.Scr. 59, 352 (1999)

O.Civitarese, A.Ray

Centroids of Gamow-Teller Transitions at Finite Temperature in fp-Shell Neutron-Rich Nuclei

NUCLEAR STRUCTURE 54,56Fe, 58,60Ni; calculated Gamow-Teller transitions energies, strengths, temperature dependence. Quasiparticle RPA.

doi: 10.1238/Physica.Regular.059a00352
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1999CI08      Nucl.Phys. A653, 321 (1999)

O.Civitarese, J.Suhonen

Systematic Study of the Single-State Dominance in 2νββ Decay Transitions

RADIOACTIVITY 100Mo, 110Pd, 114,116Cd, 128Te(2β-); 106Cd, 136Ce(2EC); analyzed 2ν-accompanied 2β-decay data; deduced single-state-dominance hypothesis validity. Quasiparticle RPA.

doi: 10.1016/S0375-9474(99)00172-4
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1999CI09      Phys.Rev. C60, 024305 (1999)

O.Civitarese, F.Montani, M.Reboiro

Extended Proton-Neutron Quasiparticle Random-Phase Approximation in a Boson Expansion Method

doi: 10.1103/PhysRevC.60.024305
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1999CI12      Phys.Rev. C60, 034302 (1999)

O.Civitarese, M.Reboiro

Boson Mapping at Finite Temperature: An application to the thermo field dynamics

doi: 10.1103/PhysRevC.60.034302
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1999CI14      Nucl.Phys. A660, 255 (1999)

O.Civitarese, M.Gadella, R.Id Betan

On the Mean Value of the Energy for Resonant States

doi: 10.1016/S0375-9474(99)00405-4
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1999HI04      Phys.Rev. C60, 024309 (1999)

J.G.Hirsch, O.Civitarese, M.Reboiro

Comparison between Wave Functions in the Random Phase Approximation, Renormalized Random phase Approximation, and Self-Consistent Random Phase Approximation Methods

doi: 10.1103/PhysRevC.60.024309
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1999HI09      Phys.Rev. C60, 064303 (1999)

J.G.Hirsch, P.O.Hess, O.Civitarese

Boson Expansion Techniques, the Pauli Principle, and the Quasiparticle Random Phase Approximation Phase Transition

doi: 10.1103/PhysRevC.60.064303
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1998BH04      Phys.Rev. C58, 1247 (1998)

M.Bhattacharya, A.Garcia, M.M.Hindi, E.B.Norman, C.E.Ortiz, N.I.Kaloskamis, C.N.Davids, O.Civitarese, J.Suhonen

Electron Capture Decay of 116In and Nuclear Structure of Double β Decays

RADIOACTIVITY 116In(EC) [from 115In(d, p), E=7.6 MeV]; measured X-ray spectra vs time; deduced EC decay branch, log ft. 116Cd(2β); calculated 2ν associated 2β-decay T1/2. QRPA calculations, low-lying-state dominance hypothesis.

doi: 10.1103/PhysRevC.58.1247
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1998CI02      Phys.Rev. C57, 3055 (1998)

O.Civitarese, M.Reboiro

Exactly Solvable Fermion-Boson Mapping Representations

doi: 10.1103/PhysRevC.57.3055
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1998CI03      Phys.Rev. C57, 3062 (1998)

O.Civitarese, M.Reboiro

Comparative Study on the Validity of the Renormalized Random-Phase Approximation

doi: 10.1103/PhysRevC.57.3062
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1998CI05      Phys.Rev. C58, 1535 (1998)

O.Civitarese, J.Suhonen

Is the Single-State Dominance Realized in Double-β-Decay Transitions ?

RADIOACTIVITY 100Mo, 110Pd, 106,114,116Cd, 128Te, 136Ce(2β); calculated 2ν accompanied 2β-decay matrix elements, T1/2; deduced support for single-state-dominance hypothesis.

doi: 10.1103/PhysRevC.58.1535
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1998CI08      Phys.Rev. C58, 2787 (1998)

O.Civitarese, M.Reboiro

Fermion-Boson Interactions in a Solvable Model

doi: 10.1103/PhysRevC.58.2787
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1998CI09      Nucl.Phys. A642, 531 (1998)

O.Civitarese, A.L.De Paoli, M.C.Rocca

Resonant States in the Thermo Field Dynamics

doi: 10.1016/S0375-9474(98)00488-6
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1998CI10      Prog.Part.Nucl.Phys. 40, 297 (1998)


Nuclear Structure and Double Beta Decay

doi: 10.1016/S0146-6410(98)00039-8
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1998SU19      Phys.Rep. 300, 123 (1998)

J.Suhonen, O.Civitarese

Weak-Interaction and Nuclear-Structure Aspects of Nuclear Double Beta Decay

RADIOACTIVITY 48Ca, 76Ge, 78Kr, 82Se, 96Zr, 92,100Mo, 96Ru, 106,116Cd, 124Sn, 128,130Te, 124,136Xe, 130Ba, 136Ce, 150Nd(2β); compiled, analyzed 2β-decay data; deduced phase-space factors, matrix elements systematics.

doi: 10.1016/S0370-1573(97)00087-2
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