First measeurements in search for keV-sterile neutrino in tritium beta-decay by Troitsk nu-mass experiment, "Письма в Журнал экспериментальной и теоретической физики"

Abdurashitov, J. N.; Belesev, A. I.; Chernov, V. G.; Geraskin, E. V.; Голубев, А. А.; Grigorieva, P. V.; Коротеев, Г. А.; Likhovid, N. A.; Nozik, Alexander; Pantuev, V.; Парфенов, В. И.; Skasyrskaya, A. K.; Tkachev, I.; Zadorozhny, S. V.

doi:10.7868/s0370274x17120013

Cited by 8 publications

(2 citation statements)

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“…The rest of the region is represented by an almost flat curve (the height depends only on initial electron energy). Due to this flatness, it was possible to replace the trapping effect with a simplified formula (with a constant rate for each energy) at [1,6]. The simulation utilized the simplified geometric model and supposes that reflection from the magnetic bottleneck is instantaneous.…”

Section: Jinst 16 P05022mentioning

confidence: 99%

“…The setup consists of a windowless gaseous tritium source (WGTS), electrostatic spectrometer with adiabatic magnetic collimation (MAC-E spectrometer), and a semiconductor detector (figure 1). The setup with a smaller spectrometer was used in measurements of the mass of electron anti-neutrino before 2010 [1][2][3][4] and the larger version was used after 2010 to search for sterile neutrinos [5,6]. The tritium source remained the same.…”

Section: Introductionmentioning

confidence: 99%

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Electron evaporation from magnetic trap in Troitsk nu-mass experiment

Nozik¹,

Hamitov²

2021

J. Inst.

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This paper is dedicated to the simulation of the so-called trapping-effect observed in the Troitsk nu-mass experiment. The effect is caused by the magnetic trapping of decay electrons in the windowless gaseous tritium source and the gradual evaporation of those electrons. As a result, alongside regular tritium beta-spectrum electrons, we see additional electrons that are initially trapped in the source and escape it with changed energy. The spectrum of evaporated electrons is quite peculiar (almost flat for monochromatic initial electrons) and could not be directly measured in the experiment. So one has to rely on simulations. Also, it is possible that the same effect could be observed in other cases of magnetic traps.

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Section: Jinst 16 P05022mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electron evaporation from magnetic trap in Troitsk nu-mass experiment

Nozik¹,

Hamitov²

2021

J. Inst.

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Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

Bolton

Deppisch

Dev³

2020

J. High Energ. Phys.

173

138

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We make a comparative study of the neutrinoless double beta decay constraints on heavy sterile neutrinos versus other direct and indirect constraints from both lepton number conserving and violating processes, as a sensitive probe of the extent of lepton number violation and possible interference effects in the sterile sector. To this effect, we introduce a phenomenological parametrisation of the simplified one-generation seesaw model with one active and two sterile neutrino states in terms of experimentally measurable quantities, such as active-sterile neutrino mixing angles, CP phases, masses and mass splittings. This simple parametrisation enables us to analytically derive a spectrum of possible scenarios between the canonical seesaw with purely Majorana heavy neutrinos and inverse seesaw with pseudo-Dirac ones. We then go on to constrain the simplified parameters of this model from various experiments in energy, intensity and cosmic frontiers. We emphasise that the constraints from lepton number violating processes strongly depend on the mass splitting between the two sterile states and the relative CP phase between them. This is particularly relevant for the neutrinoless double beta decay constraint, which could now get significantly weaker for small mass splitting and opposite CP parities between the sterile states. It is important to keep this in mind while comparing the neutrinoless double beta decay constraint with the direct search limits in the electron flavour from high-energy colliders.

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