The JSNS<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e376" altimg="si25.svg"><mml:msup><mml:mrow/><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:math> detector

Ajimura, S.; Botran, M.; Choi, Jiwon; Choi, Ji Won; Cheoun, Myung-Ki; Dodo, Taro; Furuta, H.; Goh, J.; Haga, Katsuhiro; Harada, Masahide; Hasegawa, Shoichi; Hino, Y.; Hiraiwa, T.; Jang, H. I.; Jang, J. S.; Jang, Min Woo; Jeon, Hye Kyung; Jeon, S.; Joo, K. K.; Jordan, J. R.; Jung, Dongmin; Kang, Sin Kyu; Kasugai, Yoshimi; Kawasaki, T.; Kim, E. J.; Kim, J. Y.; Kim, S. B.; Kim, W.; Kinoshita, Hidetaka; Konno, T.; Lee, D. H.; Lee, S.; Lim, I. T.; Marzec, E.; Maruyama, T.; Masuda, S.; Meigo, Shin-ichiro; Monjushiro, Hideaki; Moon, D. H.; Nakano, Takashi; Niiyama, M.; Nishikawa, K.; Nomachi, M.; Pac, M. Y.; Park, J.S.; Peeters, S. J. M.; Ray, H.; Roellinghoff, Gerrit; Rott, C.; Sakai, Kenji; Sakamoto, Shinichi; Shima, T.; Shin, Chang Dong; Spitz, J.; Stancu, I.; Sugaya, Yoshihiro; Suekane, F.; Suzuya, Kentaro; Taira, M.; Ujiie, R.; Yamaguchi, Yuki; Yeh, M.; Yeo, In Sung; Yoo, Chang Kyoo; Yu, I.; Zohaib, Adil

doi:10.1016/j.nima.2021.165742

Cited by 28 publications

(10 citation statements)

References 23 publications

(16 reference statements)

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“…The J-PARC Sterile Neutrino Search at JSNS (JSNS 2 ) experiment [90] is currently operational and expects to collect several tens of thousands IBD events in the best-fit regions of the sterile-neutrino interpretation of the LSND results in the course of 3 years of operation. The detector [91] is located 24 m away from the Hg target (see also future plans for a second detector [92]), and consists of a cylindrical volume containing a gamma-catcher and a veto volume on the outermost layers with 31 t of LS (no Gd), and a neutrino target with 17 tons of Gdloaded LS in the innermost volume. The IBD neutrons are captured by Gd after ∼ 30 µs, yielding an ∼ 8 MeV photon, to be compared with the 200 µs-delayed photons with ∼ 2.2 MeV energy from capture on H. The former is a preferred signal as the background of beam-related gammas are expected to be too severe up to energies of 2.6 MeV [93].…”

Section: J-parc Spallation Neutron Sourcementioning

confidence: 99%

Dark sectors in neutron-shining-through-a-wall and nuclear absorption signals

Hostert¹,

McKeen²,

Pospelov³

et al. 2022

Preprint

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We propose new searches for n , a dark baryon that can mix with the Standard Model neutron. We show that IsoDAR, a proposal to place an intense cyclotron near a large-volume neutrino detector deep underground, can look for n → n → n transitions with much lower backgrounds than surface experiments. This neutron-shining-through-a-wall search would be possible without any modifications to the experiment and would provide the strongest laboratory constraints on the n-n mixing for a wide range of mass splittings. We also consider dark neutrons as dark matter and show that their nuclear absorption at deep-underground detectors such as SNO and Borexino places some of the strongest limits in parameter space. Finally, we describe other n signatures, such as neutrons shining through walls at spallation sources, reactors, and the disappearance of ultracold neutrons.

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Section: J-parc Spallation Neutron Sourcementioning

confidence: 99%

Dark sectors in neutron-shining-through-a-wall and nuclear absorption signals

Hostert¹,

McKeen²,

Pospelov³

et al. 2022

Preprint

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show abstract

“…If this and the similar two or three sterile scenarios are confirmed experimentally by the various experimental methods, e.g., described in refs [33,34], our unitarity method for P (ν µ → ν τ ) has to be revised. Yet, all is not lost.…”

Section: How Could Non-unitarity Come In?mentioning

confidence: 99%

“…In more generic context including the ξ bound, we expect that the better constraints which improve the current ones [37,43,44] 4 will be obtained before DUNE starts to do τ neutrino physics. It will be done, for example, by the ongoing and upcoming experiments such as SBN program at Fermilab [33], JSNS2 [34], T2K [18], NOvA [19], Super-K [45], IceCube [46,47], KM3NeT [48], JUNO [36,49], and possibly Hyper-K [13]. These are the case of low-scale unitarity violation (or low mass sterile leptons) and the bound is much severer in high-scale unitarity violation case < ∼ 10 −3 [37].…”

Section: Improving the Bound On Non-unitaritymentioning

confidence: 99%

Measuring tau neutrino appearance probability via unitarity

Martinez-Soler,

Minakata

2021

Preprint

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We propose a unitarity method for determining τ neutrino appearance probability P (ν µ → ν τ ) in long-baseline (LBL) accelerator experiments and atmospheric neutrino observations. When simultaneous in situ measurements of P (ν µ → ν µ ) and P (ν µ → ν e ) proceed, as is typical in the LBL experiments, one can use unitarity to "measure" P (ν µ → ν τ ). A theorists' toy analysis for the model-independent determination of P (ν µ → ν µ ) and P (ν µ → ν e ) is presented by using the NOvA data. It is shown in our analysis that < ∼ 5% (8%) measurement of τ neutrino appearance probability in neutrino (antineutrino) mode is possible in the peak region 1.5 < ∼ E ν < ∼ 2.5 GeV. The νSM-independent nature of determination of the probabilities is emphasized.

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“…Thus, the chance of settling the tantalizing question of eV scale sterile neutrino(s) yes or no is left for the ongoing and upcoming searches, which is to be joined by those in refs. [16,17]. In more generic contexts, search for deviation from the SM expectation is done in the frameworks of so called the "non-standard interactions" (NSI) [18], and/or non-unitarity [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…If the eV scale sterile neutrino is the cause of non-unitarity, it is likely that its presence and the properties will be known by the advanced searches such as in refs. [15][16][17] in the very near future, unless their mixing to the active sector is extremely small. With positive evidence for accessible low-mass sterile(s), one can just go to the experimental data to dig out the correct shape of the sterile lepton model.…”

Section: Introductionmentioning

confidence: 99%

Toward diagnosing neutrino non-unitarity through CP phase correlations

Minakata

2021

Preprint

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We discuss correlations between the νSM CP phase δ and the phases that originate from new physics which causes neutrino-sector unitarity violation (UV) at low energies. This study is motivated to provide one of the building pieces for a machinery to diagnose non-unitarity, our ultimate goal. We extend the perturbation theory of neutrino oscillation in matter proposed by Denton et al. (DMP) to include the UV effect expressed by the α parametrization. By analyzing the DMP-UV perturbation theory to first order, we are able to draw a completed picture of the δ -UV phase correlations in the whole kinematical region covered by the terrestrial neutrino experiments. There exist the two regions with the characteristically different patterns of the correlations: (1) the chiraltype [e −iδ α µe , e −iδ α τ e , α τ µ ] (PDG convention) correlation in the entire high-energy region |ρE| > ∼ 6 (g/cm 3 ) GeV, and (2) (blobs of the α parameters) -e ±iδ correlation in anywhere else. Some relevant aspects for measurement of the UV parameters, such as the necessity of determining all the α βγ elements at once, are also pointed out.

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The JSNS2 detector

Cited by 28 publications

References 23 publications

Dark sectors in neutron-shining-through-a-wall and nuclear absorption signals

Dark sectors in neutron-shining-through-a-wall and nuclear absorption signals

Measuring tau neutrino appearance probability via unitarity

Toward diagnosing neutrino non-unitarity through CP phase correlations

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