Systematic study of nuclear matrix elements in neutrinoless double-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>decay with a beyond-mean-field covariant density functional theory

Yao, J. M.; Song, L. S.; Hagino, K.; Ring, P.; Meng, J.

doi:10.1103/physrevc.91.024316

Cited by 170 publications

(151 citation statements)

References 77 publications

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“…Other methods investigating the light neutrinoexchange NME, such as Projected Hartree Fock Bogoliubov [58], Energy Density Functional [59], and the Relativistic Energy Density Functional [60,91], do not fall within our selection criteria, and are not included in our Figures.…”

Section: The Newmentioning

confidence: 99%

Shell model predictions forSn124double-βdecay

Horoi¹,

Neacsu²

2016

Phys. Rev. C

131

194

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Neutrinoless double-beta (0νββ) decay is a promising beyond Standard Model process. Twoneutrino double-beta (2νββ) decay is an associated process that is allowed by the Standard Model, and it was observed in about 10 isotopes, including decays to the excited states of the daughter.124 Sn was the first isotope whose double-beta decay modes were investigated experimentally, and despite few other recent efforts, no signal has been seen so far. Shell model calculations were able to make reliable predictions for 2νββ decay half-lives. Here we use shell model calculations to predict the 2νββ decay half-life of 124 Sn. Our results are quite different from the existing quasiparticle randomphase approximation (QRPA) results, and we envision that they will be useful for guiding future experiments. We also present shell model nuclear matrix elements for two potentially competing mechanisms to the 0νββ decay of 124 Sn.

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Section: The Newmentioning

confidence: 99%

Shell model predictions forSn124double-βdecay

Horoi¹,

Neacsu²

2016

Phys. Rev. C

131

194

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“…Very recently also the beyond-mean-field covariant density functional theory [54] and the corresponding non-relativistic version [55] have been used to describe the 0νββ decays of nuclei. For more details see the reviews [25,56].…”

Section: Nuclear Model and The Two-stage Fitting Proceduresmentioning

confidence: 99%

Impact of the quenching of gA on the sensitivity of 0νββ experiments

Suhonen

2017

Phys. Rev. C

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Detection of the neutrinoless ββ (0νββ) decay is of high priority in the particle-and neutrinophysics communities. The detectability of this decay mode is strongly influenced by the value of the weak axial-vector coupling constant gA. The recent nuclear-model analyses of β and ββ decays suggest that the value of gA could be dramatically quenched, reaching ratios of g free A /gA ≈ 4, where g free A = 1.27 is the free, neutron-decay, value of gA. The effects of this quenching appear devastating for the sensitivity of the present and future 0νββ experiments since the 4th power of this ratio scales the 0νββ half-lives. This, in turn, could lead to some two orders of magnitude less sensitivity for the 0νββ experiments. In the present article it is shown that by using a consistent approach to both the two-neutrino ββ and 0νββ decays by the proton-neutron quasiparticle random-phase approximation (pnQRPA), the feared two-orders-of-magnitude reduction in the sensitivity of the 0νββ experiments actually shrinks to a reduction by factors in the range 2 − 6. This certainly has dramatic consequences for the potential to detect the 0νββ decay.PACS numbers: 21.60.Jz, 23.40.Hc, 27.50.+e, 27.60.+j Keywords: Detectability of the neutrinoless double beta decay, nuclear matrix elements, quenching of the axial-vector coupling strength, sensitivity of the double-beta experiments

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“…Very recently also the beyond-mean-field covariant density functional theory [18,19] and advanced shell-model frameworks [20][21][22][23] have been used to describe the 0νββ NMEs of nuclei. For more details see the reviews [5,24].…”

Section: Introductionmentioning

confidence: 99%

Neutrinoless ββ nuclear matrix elements using isovector spin-dipole Jπ=2− data

et al. 2018

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Ground-state-to-ground-state neutrinoless double-beta (0νββ) decays in nuclei of current experimental interest are revisited. In order to improve the reliability of the nuclear matrix element (NME) calculations for the light Majorana-neutrino mode, the NMEs are calculated by exploiting the newly available data on isovector spindipole (IVSD) J π = 2 − giant resonances. In order to correctly describe the IVSD up to and beyond the giantresonance region, the present computations are performed in extended no-core single-particle model spaces using the spherical version of the proton-neutron quasiparticle random-phase approximation (pnQRPA) with twonucleon interactions based on the Bonn one-boson-exchange G matrix. The appropriate short-range correlations, nucleon form factors, higher-order nucleonic weak currents, and partial restoration of the isospin symmetry are included in the calculations. The results are compared with earlier calculations of Hyvärinen and Suhonen [Phys. Rev. C 91, 024613 (2015)] performed in much smaller single-particle bases without access to the IVSD J π = 2 − giant-resonance data reported here.

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Systematic study of nuclear matrix elements in neutrinoless double-βdecay with a beyond-mean-field covariant density functional theory

Cited by 170 publications

References 77 publications

Shell model predictions forSn124double-βdecay

Shell model predictions forSn124double-βdecay

Impact of the quenching of gA on the sensitivity of 0νββ experiments

Neutrinoless ββ nuclear matrix elements using isovector spin-dipole Jπ=2− data

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