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NSR database version of May 8, 2024.

Search: Author = S.Stoica

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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
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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
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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
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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
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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, T_1/2 for decay to ground and excited states. Shell model approach.

RADIOACTIVITY ⁴⁸Ca(2β^-); calculated 2νββ-decay matrix elements, T_1/2 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, T_1/2 for 0ν-accompanied 2β-decay. Quasiparticle RPA, comparison with data, implications for neutrino mass discussed.

doi: 10.1134/1.1811179
Citations: PlumX Metrics

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, T_1/2. 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
Citations: PlumX Metrics

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, T_1/2. 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 T_1/2, 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 T_1/2, 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 T_1/2, 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 ^{188,190,192,194}Pt, ^{182,184,186,188,190,192}Os, ^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.