Value of the Axial-Vector Coupling Strength in β and ββ Decays: A Review

Suhonen, J.

doi:10.3389/fphy.2017.00055

Cited by 187 publications

(189 citation statements)

References 256 publications

(571 reference statements)

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“…• Even if our results may be still significantly improved, we can assert that the effect of the renormalization of the 0νββ-decay operator, with respect to the truncation of the full Hilbert space to the shell-model one, is far less important than that regarding the well-known problem of the g A quenching [33,76]. Namely, the M 0ν s calculated using the effective 0νββ-decay operator are quite larger than those calculated employing a quenching factor deduced by our results for the 2νββ-decay (see Section III).…”

Section: Discussionmentioning

confidence: 76%

Calculation of the neutrinoless double- β decay matrix element within the realistic shell model

et al. 2020

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We approach the calculation of the nuclear matrix element of the neutrinoless double-β decay process, considering the light-neutrino-exchange channel, by way of the realistic shell model. To this end, we start from a realistic nucleon-nucleon potential and then derive the effective shellmodel Hamiltonian and 0νββ-decay operator within the many-body perturbation theory. We focus on investigating the perturbative properties of the effective shell-model operator of such a decay process, aiming to establish the degree of reliability of our predictions. The contributions of the socalled short-range correlations and of the correction of Pauli-principle violations to the effective shellmodel operator, the latter introduced in many-valence nucleon systems, are also taken into account. The subjects of our study are a few candidates to the 0νββ-decay detection, in a mass interval ranging from A = 48 up to A = 136, whose spin-and spin-isospin-dependent decay properties we have studied in previous works. Our results evidence that the effect of the renormalization of the 0νββ-beta decay operator on the values of the nuclear matrix elements is less relevant than what we have obtained in previous studies of the effective single-body GT transitions operating also in the two neutrinos double-beta decay PACS numbers: 21.60.Cs, 21.30.Fe, 27.60.+j, 23.40-s 1/2 −1/2 . Moreover, combining the calculated nuclear structure factor with neutrino mixing parameters [10] and limits on m ν from current experiments, one may extract an estimation of the half-life an experiment should measure in order to be sensitive to a particular value of the neutrino effective mass [1]. All the above considerations evidence that reliable calculations of M 0ν are of paramount importance, and, currently, various nuclear structure models arXiv:2001.00890v2 [nucl-th] 3 Apr 2020

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Section: Discussionmentioning

confidence: 76%

Calculation of the neutrinoless double- β decay matrix element within the realistic shell model

et al. 2020

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“…Low-threshold optical bolometers can also be exploited for the investigation of other rare processes as the study of a beta spectrum shape of 4-fold-forbidden β decays of 113 Cd and 115 In [25] to scrutinize the value of the axial-vector coupling constant. Its value is expected to be similar to one involved in the neutrino-less double-beta decay process [26]. In spite of 10 14 -10 16 yr half-live of these rare beta decays, the induced counting rate and subsequently the probability of pile-ups in macro-bolometers containing these nuclides can be rather high, which strongly affects the precision of the spectrum reconstruction.…”

Section: Discussionmentioning

confidence: 97%

Charge-to-heat transducers exploiting the Neganov-Trofimov-Luke effect for light detection in rare-event searches

Novati

Bergé

Dumoulin

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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In this work we present how to fabricate large-area (15 cm 2 ), ultra-low threshold germanium bolometric photo-detectors and how to operate them to detect few (optical) photons. These detectors work at temperatures as low as few tens of mK and exploit the Neganov-Trofimov-Luke (NTL) effect. They are operated as charge-to-heat transducers: the heat signal is linearly increased by simply changing a voltage bias applied to special metal electrodes, fabricated onto the germanium absorber, and read by a (NTD-Ge) thermal sensor. We fabricated a batch of five prototypes and ran them in different facilities with dilution refrigerators. We carefully studied how impinging spurious infrared radiation impacts the detector performances, by shining infrared photons via optical-fiber-guided LED signals, in a controlled manner, into the bolometers. We hence demonstrated how the radiation-tightness of the test environment tremendously enhances the detector performances, allowing to set electrode voltage bias up to 90 volts without any leakage current and signal-to-noise gain as large as a factor 12 (for visible photons). As consequence, for the first time we could operate large-area NTD-Ge-sensorequipped NTL bolometric photo-detectors capable to reach sub 10-eV baseline noise (RMS). Such detectors open new frontiers for rare-event search experiments based on low light yield Ge-NTD equipped scintillating bolometers, such the CUPID neutrinoless double-beta decay experiment.1 The enhancement of visible-wavelength photons absorption was initially found to be 35% [45].

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“…Moreover, the effective value of g A can also depend on the energy scale of the process and it can be different for β and 2β decays (for exhaustive reviews see Refs. [169,170]). A good probe to study the effective value of g A can be the β decay of the 113 Cd isotope (4th forbidden non-unique, Q β = (323.83 ± 0.27) keV [63]).…”

Section: The Rare β Decaysmentioning

confidence: 99%

“…[244,245,190], the investigations of the spectral shape of non-unique forbidden β decays have the potential to give an estimate of the weak interaction coupling constants g A and g V by comparing a theoretical shape with the experimental spectrum. The approach provides an important possibility to solve the g A problem of the neutrinoless double beta decay [246,247,248,170]. However, the spectrum measured in [193] and utilized in the work [244] to estimate the g A constant, was without systematic uncertainties which limited the capability of the approach to find the most suitable nuclear models and to estimate g A .…”

Section: CD β Decaymentioning

confidence: 99%

Experimental searches for rare alpha and beta decays

et al. 2019

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The current status of the experimental searches for rare alpha and beta decays is reviewed. Several interesting observations of alpha and beta decays, previously unseen due to their large half-lives (10 15 − 10 20 yr), have been achieved during the last years thanks to the improvements in the experimental techniques and to the underground locations of experiments that allows to suppress backgrounds. In particular, the list includes first observations of alpha decays of 151 Eu, 180 W (both to the ground state of the daughter nuclei), 190 Pt (to excited state of the daughter nucleus), 209 Bi (to the ground and excited states of the daughter nucleus). The isotope 209 Bi has the longest known half-life of T 1/2 ≈ 10 19 yr relatively to alpha decay. The beta decay of 115 In to the first excited state of 115 Sn (Eexc = 497.334 keV), recently observed for the first time, has the Q β value of only (147 ± 10) eV, which is the lowest Q β value known to-date. Searches and investigations of other rare alpha and beta decays ( 48 Ca, 50 V, 96 Zr, 113 Cd, 123 Te, 178m2 Hf, 180m Ta and others) are also discussed.

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Value of the Axial-Vector Coupling Strength in β and ββ Decays: A Review

Cited by 187 publications

References 256 publications

Calculation of the neutrinoless double- β decay matrix element within the realistic shell model

Calculation of the neutrinoless double- β decay matrix element within the realistic shell model

Charge-to-heat transducers exploiting the Neganov-Trofimov-Luke effect for light detection in rare-event searches

Experimental searches for rare alpha and beta decays

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