The νGeN experiment at the Kalinin Nuclear Power Plant

Belov, V.; Brudanin, V.; Egorov, V. S.; Filosofov, D.; Fomina, M.; Gurov, Yu. B.; Короткова, Л. П.; Lubashevskiy, A.; Medvedev, D. V.; Pritula, R.; Rozova, I.; Rozov, S.; Sandukovsky, V. G.; Timkin, V.; Yakushev, E.; Yurkowski, J.; Zhitnikov, I.

doi:10.1088/1748-0221/10/12/p12011

Cited by 85 publications

(84 citation statements)

References 12 publications

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“…The expected energy threshold for electrons of germanium bolometers is 200 eV [75], which, accounting for the quenching in germanium detectors [76], roughly corresponds to 1 keV of the 74 Ge recoil kinetic energy. We refer to the νGEN experiment at the Kalinin Nuclear Power Plant [51] as an example. For illustration we calculate the differential cross-sections for two ν e energies, 5 MeV and 7 MeV, and total cross-section for E ν ∈ (1, 20) MeV.…”

Section: Discussionmentioning

confidence: 99%

“…Dating back to the seminal paper by Freedman [1], a number of experimental proposals [2,[39][40][41][42][43][44][45][46][47][48][49][50][51][52][53] using reactor and accelerator neutrinos were suggested to observe neutrinonucleus coherent scattering. This process is an unavoidable background in sensitive searches for dark matter [54][55][56][57][58].…”

Section: Arxiv:180608768v1 [Hep-ph] 22 Jun 2018mentioning

confidence: 99%

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Coherency and incoherency in neutrino-nucleus elastic and inelastic scattering

2018

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Neutrino-nucleus scattering νA → νA, in which the nucleus conserves its integrity, is considered. Our consideration follows a microscopic description of the nucleus as a bound state of its constituent nucleons described by a multi-particle wave-function of a general form.We show that elastic interactions keeping the nucleus in the same quantum state lead to a quadratic enhancement of the corresponding cross-section in terms of the number of nucleons. Meanwhile, the crosssection of inelastic processes in which the quantum state of the nucleus is changed, essentially has a linear dependence on the number of nucleons. These two classes of processes are referred to as coherent and incoherent, respectively.Accounting for all possible initial and final internal states of the nucleus leads to a general conclusion independent of the nuclear model. The coherent and incoherent cross-sections are driven by factors |F p/n | 2 and (1 − |F p/n | 2 ), where |F p/n | 2 is a proton/neutron form-factor of the nucleus, averaged over its initial states. Therefore, our assessment suggests a smooth transition between regimes of coherent and incoherent neutrinonucleus scattering. In general, both regimes contribute to experimental observables.The coherent cross-section formula used in the literature is revised and corrections depending on kinematics are estimated. Consideration of only those matrix elements which correspond to the same initial and final spin states of the nucleus and accounting for a non-zero momentum of the target nucleon are two main sources of the corrections.As an illustration of the importance of the incoherent channel we considered three experimental setups with different nuclei. As an example, for 133 Cs and neutrino energies of 30 − 50 MeV the incoherent cross-section is about 10-20% of the coherent contribution if experimental detection threshold is accounted for.Experiments attempting to measure coherent neutrino scattering by solely detecting the recoiling nucleus, as is typical, might be including an incoherent background that is indistinguishable from the signal if the excitation gamma eludes its detection. However, as is shown here, the incoherent component can be measured directly by searching for photons released by the excited nuclei inherent to the incoherent channel. For a beam experiment these gammas should be correlated in time with the beam, and their higher energies make the corresponding signal easily detectable at a rate governed by the ratio of incoherent to coherent cross-sections. The detection of signals due to the nuclear recoil and excitation γs provides a more sensitive instrument in studies of nuclear structure and possible signs of new physics. CONTENTS

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Section: Discussionmentioning

confidence: 99%

Section: Arxiv:180608768v1 [Hep-ph] 22 Jun 2018mentioning

confidence: 99%

Coherency and incoherency in neutrino-nucleus elastic and inelastic scattering

2018

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“…Coherent scattering off atomic systems was studied in [36,37]. There are some experimental proposals to observe the CNNS [2,10,[38][39][40][41][42][43][44][45][46][47][48][49][50][51]. This process is an unavoidable background in sensitive direct dark matter searches [52][53][54][55][56].…”

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confidence: 99%

On Coherent Neutrino and Antineutrino Scattering off Nuclei

Bednyakov

Naumov

2019

Phys. Part. Nuclei Lett.

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Neutrino-nucleus νA → νA and antineutrino-nucleusνA →νA interactions, when the nucleus conserves its integrity, are discussed with coherent (elastic) and incoherent (inelastic) scattering regimes taken into account. In the first regime the nucleus remains in the same quantum state after the scattering and the cross-section depends on the quadratic number of nucleons. In the second regime the nucleus changes its quantum state and the cross-section has an essentially linear dependence on the number of nucleons. The coherent and incoherent cross-sections are driven by a nuclear nucleon form-factor squared |F | 2 term and a (1−|F | 2 ) term, respectively. One has a smooth transition between the regimes of coherent and incoherent (anti)neutrino-nucleus scattering. Due to the neutral current nature these elastic and inelastic processes are indistinguishable if the nucleus recoil energy is only observed. One way to separate the coherent signal from the incoherent one is to register γ quanta from deexcitation of the nucleus excited during the incoherent scattering. Another way is to use a very low-energy threshold detector and collect data at very low recoil energies, where the incoherent scattering is vanishingly small. In particular, for 133 Cs and neutrino energies of 30-50 MeV the incoherent cross-section is about 15-20% of the coherent one. Therefore, the COHERENT experiment (with 133 Cs) has measured the coherent elastic neutrino nucleus scattering (CEνNS) with the inelastic admixture at a level of 15-20%, if the excitation γ quantum escapes its detection.After Freedman's paper [1] it was confirmed [2-5] that in the Standard Model the cross-section of elastic neutrino scattering off a nucleus is enhanced with respect to neutrino scattering off a single nucleon. The amplification factor for a spinless even-evenHere T A is the kinetic energy of the scattered nucleus, m A is the nucleus mass, q is the momentum transfer, G F is the Fermi constant, Z and N are the numbers of protons and neutrons, g p/n V are the proton/neutron couplings of the nucleon vector current, and F p/n (q) are the proton/neutron form-factors of the nucleus. The form-factors vanish as |q| → ∞ and approach unity (F p/n (q) = 1) if |q|R A 1, where R A is the radius of the nucleus. The coherency requirement reads as |q|R 1. Freedman used the termin "coherent neutrino-nucleus scattering" (CNNS) [1] to emphasize the fact that the dependence of the corresponding cross-section is quadratic in terms of the number of nucleons.The importance of the CNNS was demonstrated for a number of observables in astrophysics, like stellar collapse [13,14], and Supernovae [12,[15][16][17], in studies of physics beyond the Standard Model (SM) [3,11,[18][19][20][21][22][23][24][25][26][27][28], and in investigation of the nuclear structure [4,[29][30][31][32][33]. Due to the neutral-current nature an observation of ν-oscillations with CNNS could be evidence for sterile neutrino(s) [34,35]. Coherent scattering off atomic systems was studied in [36,37]. There are some expe...

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“…This constraint is quite weak relative to the other experiments in the figure, but it is the only such analysis that can currently exclude any portion of this parameter space. We focus on a subset the many (existing and proposed) CEνNS experiments [78][79][80][81][82][83][84][85], starting with the RED100 [86] and MINER [87] proposals. The sensitivities of these experiments to sterile neutrinos were studied in Ref.…”

Section: Low-threshold Experimentsmentioning

confidence: 99%

Constraining sterile neutrino cosmology with terrestrial oscillation experiments

Berryman

2019

Phys. Rev. D

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We explore the complementarity between terrestrial neutrino oscillation experiments and astrophysical/cosmological measurements in probing the existence of sterile neutrinos. We find that upcoming accelerator neutrino experiments will not improve on constraints by the time they are operational, but that reactor experiments can already probe parameter space beyond the reach of Planck. We emphasize the tension between cosmological experiments and reactor antineutrino experiments and enumerate several possibilities for resolving this tension. † It is, by hypothesis, not possible to directly detect sterile neu-arXiv:1905.03254v1 [hep-ph]

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The νGeN experiment at the Kalinin Nuclear Power Plant

Cited by 85 publications

References 12 publications

Coherency and incoherency in neutrino-nucleus elastic and inelastic scattering

Coherency and incoherency in neutrino-nucleus elastic and inelastic scattering

On Coherent Neutrino and Antineutrino Scattering off Nuclei

Constraining sterile neutrino cosmology with terrestrial oscillation experiments

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