First Limit on the Direct Detection of Lightly Ionizing Particles for Electric Charge as Low as 
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 with the Majorana Demonstrator

Alvis, S. I.; Arnquist, I. J.; Avignone, F. T.; Barabash, A. S.; Barton, C. J.; Bertrand, F.; Brudanin, V.; Busch, M.; Buuck, M.; Caldwell, T. S.; Chan, Y-D.; Christofferson, C. D.; Chu, Pinghan; Cuesta, C.; Detwiler, J. A.; Dunagan, C.; Efremenko, Yu.; Ejiri, H.; Elliott, S. R.; Gilliss, T.; Giovanetti, G. K.; Green, M. P.; Gruszko, J.; Guinn, I. S.; Guiseppe, V. E.; Haufe, C. R.; Hehn, L.; Henning, R.; Hoppe, E. W.; Howe, M. A.; Коновалов, С. И.; Kouzes, Richard T.; López, A.; Martin, R. D.; Massarczyk, R.; Meijer, S. J.; Mertens, S.; Myslik, J.; O’Shaughnessy, C.; Othman, G.; Pettus, W.; Poon, A. W. P.; Radford, D. C.; Rager, J.; Reine, A. L.; Rielage, K.; Robertson, R. G. H.; Ruof, N. W.; Shanks, B.; Shirchenko, M.; Suriano, A. M.; Tedeschi, D. J.; Varner, R. L.; Vasilyev, S.; Vorren, K.; White, B. R.; Wilkerson, J. F.; Wiseman, C.; Xu, W.; Yakushev, E.; Yu, C.‐H.; Yumatov, V.; Zhitnikov, I.; Zhu, B. X.

doi:10.1103/physrevlett.120.211804

Cited by 51 publications

(40 citation statements)

References 76 publications

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“…The combined Ge mass of the Demonstrator is 44.8 kg with 14.4 kg of natural Ge detectors and 29.7 kg of detectors enriched to 88.1±0.7% in 76 Ge [17]. The enriched detectors are P-type, point contact (PPC) detectors [18][19][20] with low capacitance and sub-keV energy thresholds, permitting a variety of low-energy physics studies [21,22]. The ultra low-backgrounds achieved with the Demonstrator also permit other searches for new exotic physics, for instance tri-nucleon decay [23].…”

Section: Introductionmentioning

confidence: 99%

Search for neutrinoless double- β decay in Ge76 with 26 kg yr of exposure from the Majorana Demonstrator

Alvis¹,

Arnquist²,

Avignone³

et al. 2019

Phys. Rev. C

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133

129

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The Majorana Collaboration is operating an array of high purity Ge detectors to search for the neutrinoless double-beta decay of 76 Ge. The Majorana Demonstrator consists of 44.1 kg of Ge detectors (29.7 kg enriched to 88% in 76 Ge) split between two modules constructed from ultra-clean materials. Both modules are contained in a low-background shield at the Sanford Underground Research Facility in Lead, South Dakota. We present updated results on the search for neutrinoless double-beta decay in 76 Ge with 26.0 ± 0.5 kg-yr of enriched exposure. With the Demonstrator's unprecedented energy resolution of 2.53 keV FWHM at Q ββ , we observe one event in the region of interest with 0.65 events expected from the estimated background, resulting in a lower limit on the 76 Ge neutrinoless double-beta decay half-life of 2.7 × 10 25 yr (90% CL) with a median sensitivity of 4.8 × 10 25 yr (90% CL). Depending on the matrix elements used, a 90% CL upper limit on the effective Majorana neutrino mass in the range of 200-433 meV is obtained. The measured background in the low-background configurations is 11.9 ± 2.0 counts/(FWHM t yr).

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Section: Introductionmentioning

confidence: 99%

Search for neutrinoless double- β decay in Ge76 with 26 kg yr of exposure from the Majorana Demonstrator

Alvis¹,

Arnquist²,

Avignone³

et al. 2019

Phys. Rev. C

Self Cite

133

129

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“…MCP have been studied and searched for on various fronts (see, e.g., Refs. [4][5][6][7][8][9][10][11][12][13][14][15][16]) 1 .…”

Section: Introductionmentioning

confidence: 99%

Proton fixed-target scintillation experiment to search for millicharged dark matter

Kelly

Tsai

2019

Phys. Rev. D

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We propose a low-cost and movable setup to probe minicharged particles (or milli-charged particles) using high-intensity proton fixed-target facilities. This proposal, FerMINI, consists of a milliQan-type detector, requiring multi-coincident (nominally, triple-coincident) scintillation signatures within a small time window, located downstream of the proton target of a neutrino experiment. During the collisions of a large number of protons on the target, intense minicharged particle beams may be produced via meson photo-decays and Drell-Yan production. We take advantage of the high statistics, shielding, and potential neutrino-detector-related background reduction to search for minicharged particles in two potential sites: the MINOS near detector hall and the proposed DUNE near detector hall, both at Fermilab. We also explore several alternative designs, including the modifications of the nominal detector to increase signal yield, and combining this detector technology with existing and planned neutrino detectors to better search for minicharged particles. The CERN SPS beam and associated experimental structure also provide a similar alternative. FerMINI can achieve unprecedented sensitivity for minicharged particles in the MeV to few GeV regime with fractional charge ε = Qχ/e between 10 −4 (potentially saturating the detector limitation) and 10 −1 .

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“…on incoming flux of χq from secondary dark cosmic-rays versus its charge fraction δ. Results from other benchmark experiments such as LSD [54], Kamiokande-II [55], MACRO [56],CDMS II [57], and MAJORANA [58] are superimposed. The constraints are applicable to mχ q > 4 × 10 −4 GeV/c 2 , below which attenuation effects before reaching the detectors would limit the sensitivities.…”

Section: Experimental Constraintsmentioning

confidence: 99%

Constraints on millicharged particles with low-threshold germanium detectors at Kuo-Sheng Reactor Neutrino Laboratory

et al. 2019

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Relativistic millicharged particles (χq) have been proposed in various extensions to the Standard Model of particle physics. We consider the scenarios where they are produced at nuclear reactor core and via interactions of cosmic-rays with the earth's atmosphere. Millicharged particles could also be candidates for dark matter, and become relativistic through acceleration by supernova explosion shock waves. The atomic ionization cross section of χq with matter are derived with the equivalent photon approximation. Smoking-gun signatures with significant enhancement in the differential cross section are identified. New limits on the mass and charge of χq are derived, using data taken with a point-contact germanium detector with 500 g mass functioning at an energy threshold of 300 eV at the Kuo-Sheng Reactor Neutrino Laboratory.Big Bang nucleosynthesis [12,13], and direct laboratory experiments [14][15][16].The theme of this article is to report new direct laboratory limits on χ q using data acquired by an n-type Point-Contact Germanium (PCGe) detector with sub-keV sensitivity and excellent energy resolution. The PCGe technology [17] is being used in the studies of coherent neutrino nucleus elastic scattering, as well as searches of "light" WIMPs [18][19][20][21] and neutrinoless double beta decay.This article is organized as follows. Three cases of χ q are selected for investigations, whose origins and flux estimations are given in Section II. The interaction of χ q with matter and the derivation of cross sections are discussed in Section III. Physics constraints on χ q derived from data taken with the PCGe at the Kuo-Sheng Reactor Neutrino Laboratory (KSNL) [17,[22][23][24][25] are presented in Section IV. II. SOURCES OF MILLICHARGED PARTICLES A. Nuclear Reactor-χqNuclear reactor cores are powerful sources of γ-rays and therefore have been used for searches of axions [26,27], dark photons [28,29], and millicharged neutrinos [30]. Approximately half of the γ-radioactivity are of "prompt" origins directly from highly excited fission frag-arXiv:1808.02719v2 [hep-ph]

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First Limit on the Direct Detection of Lightly Ionizing Particles for Electric Charge as Low as e/1000 with the Majorana Demonstrator

Cited by 51 publications

References 76 publications

Search for neutrinoless double- β decay in Ge76 with 26 kg yr of exposure from the Majorana Demonstrator

Search for neutrinoless double- β decay in Ge76 with 26 kg yr of exposure from the Majorana Demonstrator

Proton fixed-target scintillation experiment to search for millicharged dark matter

Constraints on millicharged particles with low-threshold germanium detectors at Kuo-Sheng Reactor Neutrino Laboratory

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