Double β Decay and the Axial Strength

Suhonen, J.; Kostensalo, Joel

doi:10.3389/fphy.2019.00029

Cited by 36 publications

(29 citation statements)

References 87 publications

(184 reference statements)

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“…Studies of highly-forbidden β decays are of particular interest to scrutinize the value of the axial-vector coupling constant, g A [30,31,[137][138][139]. A possible g A quenching with respect to the free nucleon value ( 1.27, see [140] and references therein) would affect the β spectral shape, notably at low energies.…”

Section: Rare Beta Decaymentioning

confidence: 99%

Scintillation in Low-Temperature Particle Detectors

Poda

2021

Physics

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Inorganic crystal scintillators play a crucial role in particle detection for various applications in fundamental physics and applied science. The use of such materials as scintillating bolometers, which operate at temperatures as low as 10 mK and detect both heat (phonon) and scintillation signals, significantly extends detectors performance compared to the conventional scintillation counters. In particular, such low-temperature devices offer a high energy resolution in a wide energy interval thanks to a phonon signal detection, while a simultaneous registration of scintillation emitted provides an efficient particle identification tool. This feature is of great importance for a background identification and rejection. Combined with a large variety of elements of interest, which can be embedded in crystal scintillators, scintillating bolometers represent powerful particle detectors for rare-event searches (e.g., rare alpha and beta decays, double-beta decay, dark matter particles, neutrino detection). Here, we review the features and results of low-temperature scintillation detection achieved over a 30-year history of developments of scintillating bolometers and their use in rare-event search experiments.

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Section: Rare Beta Decaymentioning

confidence: 99%

Scintillation in Low-Temperature Particle Detectors

Poda

2021

Physics

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“…Here it is appropriate to note that the effective value of g A can also be enhanced, as in the case of first-forbidden J + ↔ J − decays. In these cases the enhancement is coming from the two-body meson-exchange currents affecting the axial-charge nuclear matrix element and there is an interference of this enhancement and the quenching related to the usual sources of quenching of g A [15,20,21].…”

Section: Values Of G Effmentioning

confidence: 99%

Neutrino-nuclear responses and the effective value of weak axial coupling

Suhonen

2019

Workshop on Calculation of Double-Beta-Decay Matrix Elements (Medex’19)

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“…This approach then provides a mean value of the effective axial-vector coupling g A = 0.68. References [15,16] offer a detailed survey of the effective axial-vector strength in β decay. In particular, Table 1 found in Ref.…”

Section: Numerical Applicationmentioning

confidence: 99%

Effective axial-vector strength within proton-neutron deformed quasiparticle random-phase approximation

2019

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We use the available experimental Gamow-Teller β − and β + /EC (electron-capture) decay rates between 0 + and 1 + ground states in neighboring even-even and odd-odd nuclei, combined with 2νββ half-lives, to analyze the influence of the nuclear environment on the weak axial-vector strength g A. For this purpose, the proton-neutron deformed quasiparticle random-phase approximation (pn-dQRPA), with schematic dipole residual interaction is employed. The Hamiltonian contains particle-hole (ph) and particle-particle (pp) channels with mass-dependent strengths. In deriving the equations of motion we use a self-consistent procedure in terms of a single-particle basis with projected angular momentum provided by the diagonalization of a spherical mean field plus the quadrupole-quadrupole interaction. Our analysis evidenced a quenched average effective value g A ≈ 0.7 with a root-mean-square deviation of σ ≈ 0.3 for transitions from even-even emitters and σ ≈ 0.6 for transitions from odd-odd emitters.

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Double β Decay and the Axial Strength

Cited by 36 publications

References 87 publications

Scintillation in Low-Temperature Particle Detectors

Scintillation in Low-Temperature Particle Detectors

Neutrino-nuclear responses and the effective value of weak axial coupling

Effective axial-vector strength within proton-neutron deformed quasiparticle random-phase approximation

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