Lifetime limits on (B-L)-violating nucleon decay and di-nucleon decay modes from the Fréjus experiment

Berger, Ch.; Fröhlich, Matthias; Mönch, H.; Nisius, R.; Raupach, F.; Schleper, P.; Benadjal, Y.; Blum, D.; Boudarios, C.; Dudelzack, B.; Eschstruth, P.; Jullian, S.; Lalanne, D.; Laplanche, F.; Longemare, C.; Paulot, C.; Perdereau, O.; Roy, P.; Szklarz, G.; Behr, L.; Degrange, B.; Nguyen-Khac, U.; Tisserant, S.; Arpesella, C.; Bareyre, P.; Barloutaud, R.; Borg, A.; Chardin, G.; Ernwein, J.; Glicenstein, J. F.; Mosca, L.; Moscoso, L.; Becker, J. K.; Becker, K.; Daum, K.; Jacobi, B.; Кузник, Б. И.; Löffler, Jörg F.; Meyer, H.; Rhode, W.; Schubnell, M.; Wei, Y.

doi:10.1016/0370-2693(91)91479-f

Cited by 56 publications

(45 citation statements)

References 29 publications

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“…Experimental limits have been set for n → 3ν decay in underground experiments [19,20] assuming that the whole Earth is the source of decaying neutrons. The underground detectors in this case measure the specific energy spectrum above the background level of atmospheric neutrino signals, resulting from decay-neutrinos interactions with the material of the detector.…”

Section: Existing Limits For Neutron Disappearancementioning

confidence: 99%

“…The best limit set from the analysis of the muon events induced by charge-current ν µ interactions in the detector [19] was τ (n → 3ν µ ) > 5 · 10 26 years. The best limit from ν e interactions was set in [20] as τ (n → 3ν e ) ≥ 3 · 10 25 years. Due to the detection method, these limits are only valid for the specific decay of a neutron into particular types of neutrinos and cannot generally be applied to the neutron disappearance.…”

Section: Existing Limits For Neutron Disappearancementioning

confidence: 99%

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Signatures of nucleon disappearance in large underground detectors

Kamyshkov

Kolbe

2003

Phys. Rev. D

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For neutrons bound inside nuclei, baryon instability can manifest itself as a decay into undetectable particles (e.g., n → ννν ), i.e., as a disappearance of a neutron from its nuclear state. If electric charge is conserved, a similar disappearance is impossible for a proton. The existing experimental lifetime limit for neutron disappearance is 4-7 orders of magnitude lower than the lifetime limits with detectable nucleon decay products in the final state [1]. In this paper we calculated the spectrum of nuclear de-excitations that would result from the disappearance of a neutron or two neutrons from 12 C. We found that some de-excitation modes have signatures that are advantageous for detection in the modern high-mass, low-background, and low-threshold underground detectors, where neutron disappearance would result in a characteristic sequence of time-and space-correlated events. Thus, in the KamLAND detector [2], a time-correlated triple coincidence of a prompt signal, a captured neutron, and a β + decay of the residual nucleus, all originating from the same point in the detector, will be a unique signal of neutron disappearance allowing searches for baryon instability with sensitivity 3-4 orders of magnitude beyond the present experimental limits.

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Section: Existing Limits For Neutron Disappearancementioning

confidence: 99%

Section: Existing Limits For Neutron Disappearancementioning

confidence: 99%

Signatures of nucleon disappearance in large underground detectors

Kamyshkov

Kolbe

2003

Phys. Rev. D

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“…Such a connection may already be hinted at from the requirement of baryon number violation as a necessary condition for explaining the asymmetry [18]. The disappearance ΔB ¼ 2 reactions, with invisible final state particles, have been studied and no signal excess was observed [19][20][21]. The channels np → e þ ν, np → μ þ ν, and np → τ þ ν violate the baryon number by two units and violate the lepton number by either two or zero units.…”

mentioning

confidence: 96%

“…This allows us to perform all the analyses within a unified framework. The previous searches for n → νγ, np → e þ ν, and np → μ þ ν, which were performed with a smaller detector using a counting method, resulted in the lifetime limits of 2.8 × 10 31 yr [5], 2.8 × 10 30 yr [19], and 1.6 × 10 30 yr [19], respectively. In contrast, the spectral fit employed within this work allows utilization of the extra information from the energy dependence of signal, background, and the systematic errors.…”

mentioning

confidence: 99%

Search for Nucleon and Dinucleon Decays with an Invisible Particle and a Charged Lepton in the Final State at the Super-Kamiokande Experiment

Takhistov¹,

Abe²,

Haga³

et al. 2015

Phys. Rev. Lett.

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Artículo escrito por muchos autores, sólo se referencian el primero, los autores que firman como Universidad Autónoma de Madrid y el grupo de colaboración en el caso de que aparezca en el artículoSearch results for nucleon decays p→e+X, p→μ+X, n→νγ (where X is an invisible, massless particle) as well as dinucleon decays np→e+ν, np→μ+ν, and np→τ+ν in the Super-Kamiokande experiment are presented. Using single-ring data from an exposure of 273.4 kton·yr, a search for these decays yields a result consistent with no signal. Accordingly, lower limits on the partial lifetimes of τp→e+X>7.9×1032yr, τp→μ+X>4.1×1032yr, τn→νγ>5.5×1032yr, τnp→e+ν>2.6×1032yr, τnp→μ+ν>2.2×1032yr, and τnp→τ+ν>2.9×1031yr at a 90% confidence level are obtained. Some of these searches are novelThe Super- Kamiokande experiment was built and has been operated with funding from the Japanese Ministry of Education, Culture, Sports, Science and Technology, the U.S. Department of Energy, and the U.S. National Science Foundatio

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“…Thus, in the search we have carried out, we cautiously assumed N eff obj = 1 for all the N N N processes (nnn, nnp, npp and ppp), as done in the search for the N N decays into invisible channels in ref. [32]. The used values of N eff obj are summarized in table 2.…”

Section: Xe Isotopementioning

confidence: 99%

Search for rare processes with DAMA/LXe experiment at Gran Sasso

Bernabei¹,

Belli²,

Montecchia³

et al.

The 2nd International Conference on Nuclear Physics in Astrophysics

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Abstract. After a short introduction on the low background liquid xenon DAMA set-up (DAMA/LXe) and its main previous results, we discuss the search for the nucleon, di-nucleon and tri-nucleon decays into invisible channels (disappearance or decay to neutrinos, Majorons, etc.) in the 136 Xe isotope. The obtained limits (90% C.L.) on the lifetimes are: τn > 3.3 · 10 23 yr, τp > 4.5 · 10 23 yr, τnp > 3.2 · 10 23 yr, τpp > 1.9 · 10 24 yr, τnnp > 1.4 · 10 22 yr, τnpp > 2.7 · 10 22 yr and τppp > 3.6 · 10 22 yr. In particular, the tri-nucleon decay into invisible channels is investigated here for the first time.

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Lifetime limits on (B-L)-violating nucleon decay and di-nucleon decay modes from the Fréjus experiment

Cited by 56 publications

References 29 publications

Signatures of nucleon disappearance in large underground detectors

Signatures of nucleon disappearance in large underground detectors

Search for Nucleon and Dinucleon Decays with an Invisible Particle and a Charged Lepton in the Final State at the Super-Kamiokande Experiment

Search for rare processes with DAMA/LXe experiment at Gran Sasso

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