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NSR database version of May 24, 2024.

Search: Author = S.Stoica

Found 39 matches.

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2024NI06      Universe 10, 98 (2024)

O.Nitescu, S.Ghinescu, S.Stoica, F.Simkovic

A Systematic Study of Two-Neutrino Double Electron Capture

RADIOACTIVITY 36Ar, 40Ca, 50Cr, 54Fe, 58Ni, 64Zn, 74Se, 78Kr, 84Sr, 92Mo, 96Ru, 102Pd, 106,108Cd, 112Sn, 120Te, 124,126Xe, 130,132Ba, 136,138Ce, 144Sm, 152Gd, 156,158Dy, 162,164Er, 168Yb, 174Hf, 180W, 184Os, 190Pt, 196Hg(2EC); calculated phase factors for all two-neutrino double electron capture processes with the Dirac–Hartree–Fock–Slater self-consistent method. Comparison with available data.

doi: 10.3390/universe10020098
Citations: PlumX Metrics


2023HO04      Phys.Rev. C 107, 045501 (2023)

M.Horoi, A.Neacsu, S.Stoica

Predicting the neutrinoless double-β-decay matrix element of 136Xe using a statistical approach

RADIOACTIVITY 136Xe(2β-); calculated nuclear matrix elements (NMEs) of 0νββ-decay, probability distributions of NMEs calculated with SVD, jj55t and gcn5082 Hamiltonians. Statistical method based on Bayesian averaging model for analyzing the distribution and the theoretical uncertainty of the 0νββ decay NMEs. Obtained correlation matrix between 24 observables and defined the set of desired experimental precise values to reduce uncertainties in NMEs.

doi: 10.1103/PhysRevC.107.045501
Citations: PlumX Metrics


2023NI03      Phys.Rev. C 107, 025501 (2023)

O.Nitescu, S.Stoica, F.Simkovic

Exchange correction for allowed β decay

RADIOACTIVITY 14C, 45Ca, 63Ni, 241Pu(β-); Z=1-102(β-); calculated Eβ β-spectrum shape, exchange corrections to the β-spectrum, contributions from exchange with occupied orbitals, antineutrino spectra corresponding to the β transitions. Dirac-Hartree-Fock-Slater self-consistent method modified to ensure the orthogonality between the continuum and bound electron states in the potential of the final atom.

doi: 10.1103/PhysRevC.107.025501
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2022HO16      Phys.Rev. C 106, 054302 (2022)

M.Horoi, A.Neacsu, S.Stoica

Statistical analysis for the neutrinoless double-β-decay matrix element of 48Ca

NUCLEAR STRUCTURE 48Ca, 48Ti; calculated levels, J, π, B(E2), occupation probabilities, Gamow-Teller strength, probability density functions (PDF) for observables. Interactive shell model in the fp-shell model space with FPD6, GXPF1A, and KB3G effective Hamiltonians. Comparison to experimental values.

RADIOACTIVITY 48Ca(2β-); calculated nuclear matrix elements (NMEs) of 0νββ-decay and 2νββ, GT-strength, NME probability density function. Interactive shell model in the fp-shell model space with FPD6, GXPF1A, and KB3G effective Hamiltonians. Obtained correlation matrix between 24 observables and defined the set of desired experimental precise values to reduce uncertainties in NMEs.

doi: 10.1103/PhysRevC.106.054302
Citations: PlumX Metrics


2021NI02      Phys.Rev. D 103, L031701 (2021)

O.V.Nitescu, S.A.Ghinescu, M.Mirea, S.Stoica

Probing Lorentz violation in 2νββ using single electron spectra and angular correlations

RADIOACTIVITY 100Mo(2β-); calculated Lorentz invariance violation (LIV) in the summed energy spectra of electrons.

doi: 10.1103/PhysRevD.103.L031701
Citations: PlumX Metrics


2021NI10      Universe 7, 147 (2021)

O.Nitescu, R.Dvornicky, S.Stoica, F.Simkovic

Angular Distributions of Emitted Electrons in the Two-Neutrino ββ Decay

doi: 10.3390/universe7050147
Citations: PlumX Metrics


2020NA41      Universe 6, 5 (2020)

J.-U.Nabi, M.Ishfaq, O.Nitescu, M.Mirea, S.Stoica

β-Decay Half-Lives of Even-Even Nuclei Using the Recently Introduced Phase Space Recipe

doi: 10.3390/universe6010005
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2020NI07      J.Phys.(London) G47, 055112 (2020)

O.Nitescu, S.Ghinescu, S.Stoica

Lorentz violation effects in νββ decay

RADIOACTIVITY 48Ca, 76Ge, 82Se, 100Mo, 110Pd, 116Cd, 130Te, 136Xe(2β-); calculated phase space factors, summed energy spectra of electrons, Lorentz invariance violation (LIV) effects. Comparison with available data.

doi: 10.1088/1361-6471/ab7e8c
Citations: PlumX Metrics


2019ST08      Chin.Phys.C 43, 064108 (2019)

S.Stoica

Computation of products of phase space factors and nuclear matrix elements for double beta decay

RADIOACTIVITY 48Ca, 76Ge, 82Se, 130Te, 136Xe(2β-); calculated nuclear matrix elements and phase space factors. Comparison with experimental data.

doi: 10.1088/1674-1137/43/6/064108
Citations: PlumX Metrics


2019ST14      Front.Phys.(Lausanne) 7, 12 (2019)

S.Stoica, M.Mirea

Phase Space Factors for Double-Beta Decays

RADIOACTIVITY 48Ca, 76Ge, 82Se, 96Zr, 100Mo, 110Pd, 116Cd, 128,130Te, 136Xe, 150Nd, 238U(2β-), 78Kr, 96Ru, 106Cd, 124Xe, 130Ba, 136Ce(2β+), 78Kr, 96Ru, 106Cd, 124Xe, 130Ba, 136Ce, 50Cr, 58Ni, 64Zn, 74Se, 84Sr, 92Mo, 102Pd, 112Sn, 120Te, 144Sm, 156Dy, 162Er, 168Yb, 174Hf, 184Os, 190Pt(β+EC), 78Kr, 96Ru, 106Cd, 124Xe, 130Ba, 136Ce, 78Kr, 96Ru, 106Cd, 124Xe, 130Ba, 136Ce, 50Cr, 58Ni, 64Zn, 74Se, 84Sr, 92Mo, 102Pd, 112Sn, 120Te, 144Sm, 156Dy, 162Er, 168Yb, 174Hf, 184Os, 190Pt, 36Ar, 40Ca, 54Fe, 108Cd, 126Xe, 132Ba, 138Ce, 152Gd, 158Dy, 164Er, 180W, 196Hg(2EC); analyzed available data; deduced phase factors, decay parameters.

doi: 10.3389/fphy.2019.00012
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2013ST19      Phys.Rev. C 88, 037303 (2013)

S.Stoica, M.Mirea

New calculations for phase space factors involved in double-β decay

RADIOACTIVITY 48Ca, 76Ge, 82Se, 96Zr, 100Mo, 110Pd, 116Cd, 128,130Te, 136Xe, 150Nd, 238U(2β-); calculated phase space factors (PSF) for ββ transitions to ground states and excited 0+ states. Numerical solution of Dirac equation including the finite nuclear size and electron screening effects. Comparison with other theoretical calculations using different approximations, and discussed possible causes of differences.

doi: 10.1103/PhysRevC.88.037303
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2012NE11      Phys.Rev. C 86, 067304 (2012)

A.Neacsu, S.Stoica, M.Horoi

Fast, efficient calculations of the two-body matrix elements of the transition operators for neutrinoless double-β decay

RADIOACTIVITY 48Ca, 82Se(2β-); calculated two-body matrix elements (TBME) of neutrinoless double beta (0νββ) decay transition operator using a new, and fast algorithm.

doi: 10.1103/PhysRevC.86.067304
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2010HO02      Phys.Rev. C 81, 024321 (2010)

M.Horoi, S.Stoica

Shell model analysis of the neutrinoless double-β decay of 48Ca

RADIOACTIVITY 48Ca(2β-); calculated nuclear matrix elements for neutrinoless double-β decay using large-scale shell model.

NUCLEAR STRUCTURE 48Ca, 48Ti; calculated neutron and proton occupation probabilities, and nuclear matrix elements for double-β decay using large-scale shell model.

doi: 10.1103/PhysRevC.81.024321
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2010NE02      J.Phys.(London) G37, 055109 (2010)

A.G.Negoita, J.P.Vary, S.Stoica

No-core shell model for A = 47 and A = 49

NUCLEAR STRUCTURE 47K, 47,48,49Ca, 49Sc; calculated single-particle ground and excitation energy levels, correlation matrix elements. GXPF1 interaction.

doi: 10.1088/0954-3899/37/5/055109
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2009ST25      Nucl.Phys. A828, 439 (2009); Addendum Nucl.Phys. A832, 148 (2010)

S.Stoica, B.Pastrav, J.E.Horvath, M.P.Allen

Pion mass effects on axion emission from neutron stars through NN bremsstrahlung processes

doi: 10.1016/j.nuclphysa.2009.07.007
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2009VA09      J.Phys.(London) G36, 085103 (2009)

J.P.Vary, S.Popescu, S.Stoica, P.Navratil

A no-core shell model for 48Ca, 48Sc and 48Ti

NUCLEAR STRUCTURE 48Ca, 48Sc, 48Ti; calculated binding, excitation energies, J, π. NCSM model, comparison with experiment.

doi: 10.1088/0954-3899/36/8/085103
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2007HO07      Phys.Rev. C 75, 034303 (2007)

M.Horoi, S.Stoica, B.A.Brown

Shell-model calculations of two-neutrino double-β decay rates of 48Ca with the GXPF1A interaction

NUCLEAR STRUCTURE 48Ca; calculated 2νββ-decay matrix elements, T1/2 for decay to ground and excited states. Shell model approach.

RADIOACTIVITY 48Ca(2β-); calculated 2νββ-decay matrix elements, T1/2 for decay to ground and excited states. Shell model approach.

doi: 10.1103/PhysRevC.75.034303
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2005VA32      Eur.Phys.J. A 25, Supplement 1, 475 (2005)

J.P.Vary, O.V.Atramentov, B.R.Barrett, M.Hasan, A.C.Hayes, R.Lloyd, A.I.Mazur, P.Navratil, A.G.Negoita, A.Nogga, W.E.Ormand, S.Popescu, B.Shehadeh, A.M.Shirokov, J.R.Spence, I.Stetcu, S.Stoica, T.A.Weber, S.A.Zaytsev

Ab initio No-Core Shell Model -- Recent results and future prospects

NUCLEAR STRUCTURE 4He; calculated radius. 6Li, 16O, 48Ar, 48K, 48Ca, 48Sc, 48Ti, 48V, 48Cr, 48Mn; calculated ground-state energies. 16O, 47Ca; calculated excited states energies. No-core shell model.

doi: 10.1140/epjad/i2005-06-214-x
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2004ST15      Phys.Rev. C 69, 068801 (2004)

S.Stoica, V.P.Paun, A.G.Negoita

Nuclear effects on neutrino emissivities from nucleon-nucleon bremsstrahlung

doi: 10.1103/PhysRevC.69.068801
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2004ST26      Yad.Fiz. 67, 1814 (2004); Phys.Atomic Nuclei 67, 1786 (2004)

S.Stoica

Double-Beta Decay and Neutrino Mass

RADIOACTIVITY 76Ge, 82Se, 96Zr, 100Mo, 116Cd, 128,130Te, 136Xe(2β-); calculated matrix elements, T1/2 for 0ν-accompanied 2β-decay. Quasiparticle RPA, comparison with data, implications for neutrino mass discussed.

doi: 10.1134/1.1811179
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2003ST14      Eur.Phys.J. A 17, 529 (2003)

S.Stoica, H.V.Klapdor-Kleingrothaus

Calculation of the β+ β+, β+ /EC and EC/EC half-lives for 106Cd with the second quasi random phase approximation method

RADIOACTIVITY 106Cd(2β+), (β+EC), (2EC); calculated decay matrix elements, T1/2. Second quasi RPA method.

doi: 10.1140/epja/i2003-10028-0
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2002ST03      Phys.Rev. C65, 028801 (2002)

S.Stoica, J.E.Horvath

Nuclear Effects on Bremsstrahlung Neutrino Rates of Astrophysical Interest

doi: 10.1103/PhysRevC.65.028801
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2001ST13      Phys.Rev. C63, 064304 (2001)

S.Stoica, H.V.Klapdor-Kleingrothaus

Neutrinoless Double-β-Decay Matrix Elements within the Second Quasirandom Phase Approximation Method

RADIOACTIVITY 76Ge, 82Se, 96Zr, 100Mo, 116Cd, 128,130Te, 136Xe(2β-); calculated matrix elements for neutrinoless 2β decay. Second quasirandom phase approximation.

doi: 10.1103/PhysRevC.63.064304
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2001ST17      Phys.Rev. C64, 017303 (2001)

S.Stoica, I.Mihut, J.Suhonen

Test of the Proton-Neutron Random-Phase Approximation Method within an Extended Lipkin-Type Model

doi: 10.1103/PhysRevC.64.017303
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2001ST24      Nucl.Phys. A694, 269 (2001)

S.Stoica, H.V.Klapdor-Kleingrothaus

Critical View on Double-Beta Decay Matrix Elements within Quasi Random Phase Approximation-Based Methods

RADIOACTIVITY 82Se, 96Zr, 100Mo, 116Cd, 128,130Te, 136Xe(2β-); calculated 0ν and 2ν accompanied 2β-decay matrix elements, T1/2. Quasi RPA approach.

doi: 10.1016/S0375-9474(01)00988-5
Citations: PlumX Metrics


2000ST32      Eur.Phys.J. A 9, 345 (2000)

S.Stoica, H.V.Klapdor-Kleingrothaus

Double-Beta Decay Matrix Elements for 76Ge

RADIOACTIVITY 76Ge(2β); calculated matrix element for the 2-neutrino and neutrinoless decay modes; deduced neutrino mass upper value. Random phase approximation calculations.

doi: 10.1007/s100500070018
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1998ST30      Eur.Phys.J. A 3, 319 (1998)

S.Stoica, I.Mihut, J.Suhonen

Charge-Changing Transitions in an Extended Lipkin-Type Model

doi: 10.1007/s100500050186
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1997ST15      Nucl.Phys. A620, 16 (1997)

S.Stoica, J.Suhonen, I.Mihut

An Extended Lipkin-Type Model with Residual Proton-Neutron Interaction

doi: 10.1016/S0375-9474(97)00153-X
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1996ST19      Nucl.Phys. A602, 197 (1996)

S.Stoica, I.Mihut

Nuclear Structure Calculations of Two-Neutrino Double-Beta Decay Transitions to Excited Final States

RADIOACTIVITY 76Ge, 96Zr, 100Mo, 116Cd, 136Xe(2β); calculated 2ν-accompanied 2β-decay T1/2, Gamow-Teller matrix elements. Quasi-RPA, other nuclei, other aspects discussed.

doi: 10.1016/0375-9474(96)00122-4
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1996ST36      Roum.J.Phys. 41, 481 (1996)

S.Stoica, I.Mihut

Higher-Order QRPA for Charge-Changing Processes


1995ST19      Phys.Lett. 350B, 152 (1995)

S.Stoica

Two-Neutrino Double-Beta Decay Half-Lives of 96Zr and 100Mo to Excited States of 96Mo and 100Ru

NUCLEAR STRUCTURE 100Mo, 96Zr; calculated 2ν-accompanied 2β-decay T1/2, log ft, Gamow-Teller matrix elements, B(λ). Second quasi-RPA.

doi: 10.1016/0370-2693(95)00326-G
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1994ST04      Phys.Rev. C49, 2240 (1994)

S.Stoica

Half-Lives for Two Neutrino Double-Beta-Decay Transitions to First 2+ Excited

RADIOACTIVITY 76Ge, 82Se, 110Pd, 116Cd, 128,130Te, 136Xe(2β); calculated 2ν-accompanied 2β-decay T1/2, transitions to first 2+ states; deduced (g(pp)) parameter dependence. Second quasirandom phase approximation.

doi: 10.1103/PhysRevC.49.2240
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1993ST05      Phys.Rev. C47, 867 (1993)

S.Stoica, W.A.Kaminski

Gamow-Teller Matrix Elements for Two-Neutrino Double β Decay within a Second Quasi-Random-Phase Approximation

RADIOACTIVITY 76Ge, 116,110Cd, 128,130Te, 136Ba(2β); calculated Gamow-Teller matrix element vs (particle)(particle)-strength. Second order quasiparticle RPA.

doi: 10.1103/PhysRevC.47.867
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1993ST17      Nuovo Cim. 106A, 723 (1993)

S.Stoica, W.A.Kaminski

Double-β-Decay Rates within a Second Quasi-Random-Phase Approximation

RADIOACTIVITY 76Ge, 110,116Cd, 128,130Te, 136Ba(2β); calculated 2β-decay, Gamow-Teller matrix elements. Second quasiparticle RPA procedure.

doi: 10.1007/BF02771490
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1991RA07      Phys.Lett. 254B, 7 (1991)

A.A.Raduta, A.Faessler, S.Stoica, W.A.Kaminski

The 2vββ Decay Rate within a Higher RPA Approach

RADIOACTIVITY 82Se(2β); calculated Gamow-Teller matrix element. Quasiparticle RPA, higher terms.

doi: 10.1016/0370-2693(91)90385-4
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1991RA16      Nucl.Phys. A534, 149 (1991)

A.A.Raduta, A.Faessler, S.Stoica

The 2νββ Decay Rate within a Boson Expansion Formalism

RADIOACTIVITY 82Se(2β); calculated 2ν-accompanied double β-decay rate, Gamow-Teller transition rate. Boson expansion formalism.

doi: 10.1016/0375-9474(91)90561-J
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1987RA11      Z.Phys. A327, 275 (1987)

A.A.Raduta, S.Stoica

Coupling of One and Three Quasiparticles to a Collective Core Projected from Quadrupole Coherent States

NUCLEAR STRUCTURE 189,191,193Pt; calculated levels, gyromagnetic factors, electric quadrupole, magnetic dipole moments, B(M1), B(E2). Particle-core coupling, coherent state models.


1984RA05      Rev.Roum.Phys. 29, 55 (1984)

A.A.Raduta, S.Stoica, N.Sandulescu

The Energies Predicted by the Coherent State Model for near Vibrational Nuclei

NUCLEAR STRUCTURE 188,190,192,194Pt, 182,184,186,188,190,192Os, 194,196Hg, 162Dy; calculated levels. Coherent state model.


1983RA42      Rev.Roum.Phys. 28, 867 (1983)

A.A.Raduta, C.Sabac, S.Stoica

The Phenomenological Description of the Rotational Spectra of 189,191,193Pt

NUCLEAR STRUCTURE 189,191,193Pt; calculated levels, μ, electric quadrupole moment, rotational band structure. Phenomenological Hamiltonian, multipole-multipole interaction.


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