Indications of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>2</mml:mn><mml:mi>ν</mml:mi><mml:mn>2</mml:mn><mml:mi>K</mml:mi></mml:mrow></mml:math>capture in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>78</mml:mn></mml:msup></mml:math>Kr

Gavrilyuk, Yu. M.; Gangapshev, A. M.; Kazalov, V. V.; Kuzminov, V. V.; Panasenko, S. I.; Ratkevich, S. S.

doi:10.1103/physrevc.87.035501

Cited by 80 publications

(50 citation statements)

References 40 publications

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“…Such decays have been detected for several nuclei, including a few cases of transitions into excited states [26]. At present the similar but kinematically less favored β + β + and the 2ν double-electron-capture (ECEC) decays have only been observed in geochemical measurements for 130 Ba [56,57], and there is also an indication of a possible detection in 78 Kr [58]. In principle, both GT and F operators enter the description of 2νββ decays.…”

Section: B 2νββ Decaysmentioning

confidence: 99%

Gamow-Teller and double- β decays of heavy nuclei within an effective theory

2018

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We study β decays within an effective theory that treats nuclei as a spherical collective core with an even number of neutrons and protons that can couple to an additional neutron and/or proton. First we explore Gamow-Teller β decays of parent odd-odd nuclei into low-lying ground, one-phonon, and two-phonon states of the daughter even-even system. The low-energy constants of the effective theory are adjusted to data on β decays to ground states or Gamow-Teller strengths. The corresponding theoretical uncertainty is estimated based on the power counting of the effective theory. For a variety of medium-mass and heavy isotopes the theoretical matrix elements are in good agreement with experimental results within the theoretical uncertainties. We then study the two-neutrino double-β decay into ground and excited states. The results are remarkably consistent with experiment within theoretical uncertainties, without the necessity to adjust any low-energy constants.arXiv:1708.06140v2 [nucl-th]

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Section: B 2νββ Decaysmentioning

confidence: 99%

Gamow-Teller and double- β decays of heavy nuclei within an effective theory

2018

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“…Smaller ratios A 1 /A 0 correspond to edge events because of a smaller exposure angle of the cathode. The procedure of the analysis of the shape of a pulse was described in more detail in [32,33].…”

Section: New Experiments On Search For the Resonance Absorption Of Solmentioning

confidence: 99%

New experiment on search for the resonance absorption of solar axion emitted in the M1 transition of 83Kr nuclei

et al. 2015

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Axions with an energy of 9.4 keV emitted in the M1 transition of 83 Kr nuclei in the Sun have been sought in the resonance absorption reaction A + 83 Kr → 83 Kr* → 83 Kr + γ, e (9.4 keV). A proportional gas chamber filled with krypton and placed in a low background setup at the underground laboratory of the Baksan neu trino observatory was used to detect γ ray photons and electrons appearing after the decay of a nuclear level. As a result, a new constraint has been determined on the isoscalar and isovector coupling constants of the axion with nucleons: | -| ≤ 1.29 × 10 -6 . This constraint results in the following new bound on the mass of the axion in the hadronic axion model: m A ≤ 100 eV (95% C.L.).

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“…So far, 2ν2EC has only been observed for 130 Ba in geochemical experiments [8,9]. In addition, there is an indication for 2ν2EC of 78 Kr from a low-background proportional counter [10]. In natural xenon the isotopes 124 Xe (Q = 2864 keV [11], abundance 0.095% [12]) and 126 Xe (Q = 919 keV [11], abundance 0.089% [12]) can decay via 2ν2EC.…”

Section: Introductionmentioning

confidence: 99%

Search for two-neutrino double electron capture of Xe124 with XENON100

Aprile¹,

Aalbers²,

Agostini³

et al. 2017

Phys. Rev. C

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Two-neutrino double electron capture is a rare nuclear decay where two electrons are simultaneously captured from the atomic shell. For 124 Xe this process has not yet been observed and its detection would provide a new reference for nuclear matrix element calculations. We have conducted a search for two-neutrino double electron capture from the K-shell of 124 Xe using 7636 kg·d of data from the XENON100 dark matter detector. Using a Bayesian analysis we observed no significant excess above background, leading to a lower 90% credibility limit on the half-life T 1/2 > 6.5×10 20 yr. We have also evaluated the sensitivity of the XENON1T experiment, which is currently being commissioned, and found a sensitivity of T

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Indications of2ν2Kcapture in78Kr

Cited by 80 publications

References 40 publications

Gamow-Teller and double- β decays of heavy nuclei within an effective theory

Gamow-Teller and double- β decays of heavy nuclei within an effective theory

New experiment on search for the resonance absorption of solar axion emitted in the M1 transition of 83Kr nuclei

Search for two-neutrino double electron capture of Xe124 with XENON100

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