Quenching of gA deduced from the β-spectrum shape of 113Cd measured with the COBRA experiment

Bodenstein-Dresler, L.; Chu, Y.; Gehre, D.; Gößling, C.; Heimbold, Arne; Herrmann, Christian; Hodak, Rastislav; Kostensalo, Joel; Kroeninger, K.; Küttler, Julia; Nitsch, Christian; Quante, Thomas; Rukhadze, E.; Štekl, I.; Suhonen, J.; Tebrügge, Jan; Temminghoff, R.; Volkmer, Juliane; Zatschler, Stefan; Zuber, Κ.

doi:10.1016/j.physletb.2019.135092

Cited by 36 publications

(17 citation statements)

References 61 publications

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“…On the experimental side advances have been made by measuring the 113 Cd spectrum to high accuracy [85]. When compared with the spectral shapes given in Haaranen et al [48] the following effective values of g A were obtained g eff A (ISM) = 0.915 ± 0.021 ,…”

Section: Higher-forbidden Decaysmentioning

confidence: 92%

Double β Decay and the Axial Strength

Suhonen

Kostensalo

2019

Front. Phys.

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Quenching of the weak axial strength g A is discussed and relations of this quenching to the nuclear matrix elements of double beta decays are highlighted. An analysis of Gamow-Teller transitions in the mass range A = 62 − 142 is presented and its results are compared with those of many previous works. The enhancement of the axial charge is discussed for first-forbidden pseudoscalar β transitions. Higher-forbidden β transitions are introduced and their role in determining the effective value of g A is examined, in particular from the point of view of the β-decay half-lives and the shapes of electron spectra of forbidden non-unique β transitions. Keywords: double beta decay, Gamow-Teller beta decay, quenching of weak axial coupling, forbidden beta decay, enhancement of weak axial charge, electron spectral shapes

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Section: Higher-forbidden Decaysmentioning

confidence: 92%

Double β Decay and the Axial Strength

Suhonen

Kostensalo

2019

Front. Phys.

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“…The 4-fold non-unique forbidden decays of 113 Cd (1/2 + → 9/2 + ) and 115 In (9/2 + → 1/2 + ) are sensitive to the quenching of g A because the spectral shape will change with the value of g A [67]. A measurement of 44 individual detectors in the COBRA experiment indeed indicate a value for g A in the ISM and MQPM models of 0.915 ± 0.021 and 0.911 ± 0.009 respectively [68], which is lower than the free value. Half-lives of t β 1/2 = 8 ± 0.11(stat.)…”

Section: Single Beta-decay and Electron-capture Experiments 221 Allowed And Forbidden β/Ec Experimentsmentioning

confidence: 94%

Neutrino–nuclear responses for astro-neutrinos, single beta decays and double beta decays

2019

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Neutrino-nuclear responses associated with astro-neutrinos, single beta decays and double beta decays are crucial in studies of neutrino properties of interest for astro-particle physics. The present report reviews briefly recent studies of the neutrino-nuclear responses from both experimental and theoretical points of view in order to obtain a consistent understanding of the many facets of the neutrino-nuclear responses. Subjects discussed in this review include (i) experimental studies of neutrino-nuclear responses by means of single beta decays, charge-exchange nuclear reactions, muon-photon-and neutrino-nuclear reactions, and nucleon-transfer reactions, (ii) implications of and discussions on neutrino-nuclear responses for single beta decays, for astroneutrinos, and for astro-neutrino nucleosynthesis, (iii) theoretical aspects of neutrino-nuclear responses for beta and double beta decays, for nuclear muon capture and for neutrino-nucleus scattering, and (iv) critical discussions on nucleonic and non-nucleonic spin-isospin correlations and renormalization (quenching or enhancement) effects on the axial weak coupling. Remarks are given on perspectives of experimental and theoretical studies of the neutrino-nuclear responses and on future experiments of double beta decays.

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“…For the nuclei with A = 133-142 the Hamiltonian jj56pnb [41] was used in the full model space spanned by the proton orbitals 0g 7/2 -1d-2s-0h 11/2 and neutron orbitals 0h 9/2 -1 f -2p-0i 13/2 for A < 139, while for the heavier nuclei the proton orbital 0h 11/2 and the neutron orbital 0i 13/2 were kept empty due to the enormous dimensions of a full model space calculation. Uncertainties due to g A quenching and meson exchange currents (MECs) in pseudoscalar transitions in the fission fragment region have been reported [31,[42][43][44][45][46], and will be briefly commented upon further in this work.…”

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confidence: 99%

First-forbidden transitions in reactor antineutrino spectra

et al. 2019

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We study the dominant forbidden transitions in the antineutrino spectra of the fission actinides from 4 MeV onward using the nuclear shell model. Through explicit calculation of the shape factor, we show the expected changes in cumulative electron and antineutrino spectra. Relative to the allowed approximation this results in a minor decrease of electron spectra above 4 MeV, whereas an increase of several percent is observed in antineutrino spectra. We show that forbidden transitions dominate the spectral flux for most of the experimentally accessible range. Based on the shell model calculations we attempt a parametrization of forbidden transitions and propose a spectral correction for all first-forbidden transitions. We enforce correspondence with the Institut Laue-Langevin data set using a summation+conversion approach. When compared against modern reactor neutrino experiments, the resultant spectral change is observed to be of comparable magnitude and shape as the reported spectral shoulder.

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Quenching of gA deduced from the β-spectrum shape of 113Cd measured with the COBRA experiment

Cited by 36 publications

References 61 publications

Double β Decay and the Axial Strength

Double β Decay and the Axial Strength

Neutrino–nuclear responses for astro-neutrinos, single beta decays and double beta decays

First-forbidden transitions in reactor antineutrino spectra

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