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NSR database version of May 10, 2024.

Search: Author = A.Neacsu

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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
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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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2018HO11      Phys.Rev. C 98, 035502 (2018)

M.Horoi, A.Neacsu

Shell model study of using an effective field theory for disentangling several contributions to neutrinoless double-β decay

RADIOACTIVITY ⁴⁸Ca, ⁷⁶Ge, ⁸²Se, ¹³⁰Te, ¹³⁶Xe(2β^-); calculated 20 shell model nuclear matrix elements, Q values and nine phase space factors (PSFs) for 0νββ decay mode; deduced 12 lepton-number-violating (LNV) parameters corresponding to 12 0νββ decay mechanisms using limits on experimental half-lives, coupling limits including Majorana neutrino mass. Effective field theory approach, and beyond Standard Model physics for 0νββ decay.

doi: 10.1103/PhysRevC.98.035502
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2018JI09      Phys.Rev. C 98, 064324 (2018)

C.F.Jiao, M.Horoi, A.Neacsu

Neutrinoless double-β decay of ¹²⁴Sn, ¹³⁰Te, and ¹³⁶Xe in the Hamiltonian-based generator-coordinate method

RADIOACTIVITY ¹²⁴Sn, ¹³⁰Te, ¹³⁶Xe(2β^-); calculated matrix elements for 0νββ decay mode using generator-coordinate method (GCM) with realistic shell-model interactions. Comparison with shell-model calculations obtained by exactly diagonalizing the same effective Hamiltonian.

NUCLEAR STRUCTURE ¹²⁴Sn, ^124,130Te, ^130,136Xe, ¹³⁶Ba; calculated ground state energies, low-lying 2+ and 4+ levels, B(E2) for the first 2+ states, occupancies of valence neutron and proton orbits using generator-coordinate method (GCM) with realistic shell-model interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.98.064324
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2016HO03      Phys.Rev. C 93, 024308 (2016)

M.Horoi, A.Neacsu

Shell model predictions for ¹²⁴Sn double-β decay

RADIOACTIVITY ¹²⁴Sn(2β^-); calculated Gamow-Teller and Fermi nuclear matrix elements (NMEs), GT strengths, and half-lives for 2νββ and 0νββ decay modes using shell model. Comparison with existing calculations based on quasiparticle random-phase approximation (QRPA). ⁴⁸Ca, ⁷⁶Ge, ⁸²Se, ¹²⁴Sn, ¹³⁰Te, ¹³⁶Xe(2β^-);reviewed calculated nuclear matrix elements (NMEs) for 0νββ decay mode using different nuclear structure methods for the light and heavy neutrino-exchange mechanisms.

NUCLEAR STRUCTURE ¹²⁴Sn, ¹²⁴Te; calculated levels, J, π, B(E2) for first 2+ states, occupation probabilities, neutron- and proton-shell vacancies. ^126,128Te; calculated B(E2) for first 2+ states. Comparison with experimental values.

doi: 10.1103/PhysRevC.93.024308
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2016NE13      Adv.High Energy Phys. 2016, 1 (2016)

A.Neacsu, M.Horoi

An Effective Method to Accurately Calculate the Phase Space Factors for β-β-Decay

RADIOACTIVITY ⁴⁸Ca, ⁷⁶Ge, ⁸²Se, ⁹⁶Zr, ¹⁰⁰Mo, ¹¹⁰Pd, ¹¹⁶Cd, ¹³⁰Te, ¹³⁶Xe, ¹⁵⁰Nd(2β^-); calculated phase factors taking into account the distorted Coulomb field of the daughter nucleus. Comparison with available data.

doi: 10.1155/2016/7486712
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2015NE03      Phys.Rev. C 91, 024309 (2015)

A.Neacsu, M.Horoi

Shell model studies of the ¹³⁰Te neutrinoless double-β decay

NUCLEAR STRUCTURE ¹³⁰Te, ^130,136Xe, ¹³⁶Ba; calculated levels, J, π, GT strengths for ¹³⁰Te to ¹³⁰I and ¹³⁶Xe to ¹³⁶Cs transitions. ^128,130Te, ^130,132Xe; calculated neutron and proton shell vacancies, B(E2). Shell model calculations using SVD effective Hamiltonian. Comparison with available experimental values.

RADIOACTIVITY ¹³⁰Te, ¹³⁶Xe(2β^-); calculated GT strengths nuclear matrix elements (NME) for 2νββ and 0νββ decays for light and heavy neutrino exchanges. Shell model approach using a recently proposed effective Hamiltonian SVD, and jj55 model space. Comparison with calculations for double β decays of ⁴⁸Ca, ⁷⁶Ge, ⁸²Se.

doi: 10.1103/PhysRevC.91.024309
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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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2007SI33      Rom.J.Phys. 52, 807 (2007)

I.Silisteanu, A.Sandru, A.O.Silisteanu, B.Popovici, A.Neacsu

Theoretical Approaches to Clustering and Fine Structure in Heaviest Elements