Towards Special Daemon-Sensitive Electron Multiplier: Positive Outcome of March 2009 Experiment

Drobyshevski, E. M.; Drobyshevski, M. E.

doi:10.1142/s0217732310032639

Cited by 5 publications

(18 citation statements)

References 20 publications

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“…Among the many DM candidates we recall: SUSY particles (as e.g. neu-tralino [58][59][60][61][62][63][64][65][66][67][68] or sneutrino in various scenarios [69][70][71][72] ), inelastic Dark Matter in various scenarios, [73][74][75][76] electron interacting Dark Matter (also including some WIMP scenarios), 77,78 a heavy neutrino of the 4-th family, sterile neutrino, 79 Kaluza-Klein particles, self-interacting Dark Matter, 80 axion-like (light pseudoscalar and scalar candidate), 81 mirror Dark Matter in various scenarios, [82][83][84] Resonant Dark Matter, 85 DM from exotic 4th generation quarks, 86 Elementary Black holes, [87][88][89][90] Planckian objects, [87][88][89][90] Daemons, [87][88][89][90] Composite DM, 91,92 Light scalar WIMP through Higgs portal, 93 Complex Scalar Dark Matter, 94 specific two Higgs doublet models, exothermic DM,…”

Section: Dm Candidatesmentioning

confidence: 99%

Dark Matter Investigation by Dama at Gran Sasso

Bernabei

Belli

d’Angelo

et al. 2013

Int. J. Mod. Phys. A

141

305

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Experimental observations and theoretical arguments at Galaxy and larger scales have suggested that a large fraction of the Universe is composed by Dark Matter particles. This has motivated the DAMA experimental efforts to investigate the presence of such particles in the galactic halo by exploiting a model independent signature and very highly radiopure set-ups deep underground. Few introductory arguments are summarized before presenting a review of the present model independent positive results obtained by the DAMA/NaI and DAMA/LIBRA set-ups at the Gran Sasso National Laboratory of the INFN. Implications and model dependent comparisons with other different kinds of results will be shortly addressed. Some arguments put forward in literature will be confuted.

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Section: Dm Candidatesmentioning

confidence: 99%

Dark Matter Investigation by Dama at Gran Sasso

Bernabei

Belli

d’Angelo

et al. 2013

Int. J. Mod. Phys. A

141

305

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“…This conclusion was supported by our reconnaissance underground experiments at Baksan, in which the triggering pulse was initiated by an HPS excited by a daemon in the ZnS(Ag) screen and the second, time-shifted pulse characterizing the daemon velocity was created by a light-insulated FEU-167 with increased thickness of the inner Al coating [19]. These experiments naturally suggested that the second, short pulse with an NLS shape was presumably created in our first experiments [1] in the lower FEU-167 itself, without the lower ZnS(Ag) scintillation screen being involved [3]. Therefore, a good reproducibility of these results would not be expected in replication of detectors of this kind with PMTs of other types (or even the same devices from other manufacturers) [3].…”

Section: Dark Electron Multiplier a New Device For Detection Of Daemonsmentioning

confidence: 77%

“…These experiments naturally suggested that the second, short pulse with an NLS shape was presumably created in our first experiments [1] in the lower FEU-167 itself, without the lower ZnS(Ag) scintillation screen being involved [3]. Therefore, a good reproducibility of these results would not be expected in replication of detectors of this kind with PMTs of other types (or even the same devices from other manufacturers) [3].…”

Section: Dark Electron Multiplier a New Device For Detection Of Daemonsmentioning

confidence: 89%

“…For this purpose, the manufacturer covered, on our request, the surface of the nearcathode section of the FEU-167 tube with a rather thick (~0.5 µm) Al layer. An experiment in March 2009 demonstrated that these DEMs (dark electron multipliers) do detect flight-through of daemons [3]. Further, the devices were improved so that they become sensitive to a direction of the daemon motion.…”

Section: Dark Electron Multiplier a New Device For Detection Of Daemonsmentioning

confidence: 99%

“…It is noteworthy that the shape of the scintillation signal excited by a daemon capturing a nucleus in ZnS(Ag) is naturally characteristic of somewhat prolonged scintillations caused in ZnS(Ag) by heavy non-relativistic particles of the type of α-particles (heavy particle scintillations, HPSs). Joint analysis of results of many years' measurements shows that the confidence level of the March peak in the flux of NEACHO daemons presently reaches a value of 5σ [3].…”

Section: Introduction Physics Of Daemon Detectionmentioning

confidence: 98%

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Daemons: Detection at Pulkovo, Gran Sasso and Soudan

Drobyshevski

Ponyaev

et al. 2012

Mod. Phys. Lett. A

Self Cite

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During a week of the March maximum in 2011, two oppositely installed direction-sensitive TEU-167dDark Electron Multipliers (DEMs) recorded a flux of daemons from the near-Earth almost circular heliocentric orbits (NEACHOs). The flux measured from above is f ≈ (8±3)×10 -7 cm -2 s -1 , and that from below is twice smaller. The difference may be due both to specific design features of the TEUs themselves, and to dissimilarities in the slope of trajectories along which objects are coming from above or from below. It is shown that the daemon paradigm enables a quantitative interpretation of DAMA andCoGeNT experiments with no additional hypotheses. Both the experiments record a daemon flux of f ~ 10 -6 cm -2 s -1 from strongly elongated Earth-crossing heliocentric orbits (SEECHOs), predecessors of NEACHOs. Recommendations are given for processing of DAMA/LIBRA data, which unambiguously suggest that, in approximately half of cases (when there occur double events in the detector, rejected in processing under a single-hit criterion), the signals being recorded are successively excited by a single SEECHO object along a path of ~1 m, i.e., this is not a WIMP. It is noted that due regard to cascade events and pair interaction of ions will weaken the adverse influence exerted by the blocking effect on the channeling of iodine ions knocked out in NaI(Tl) crystal. This influence will become not so catastrophic as it follows from simplified semi-analytical models of the process: one might expect the energy of up to ~10% of primary recoil iodine ions will be converted to the scintillation light.

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Now the Dark Electron Multiplier Does Sense Direction of the Daemon Motion

Drobyshevski

Pikulin

2010

Mod. Phys. Lett. A

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Detection of the September maximum in the primary near-Earth daemon flux at high (~60 o ) Northern latitudes by our set-up with a plane horizontal scintillator is plagued by purely geometric factors; indeed, because of the Earth's rotation axis being tilted, the daemons catching up with the Earth in outer Near-Earth, Almost Circular Heliocentric Orbits (NEACHOs) strike the Earth along close-tohorizontal paths. Nevertheless, application of only two oppositely oriented, specially designed "dark electron multipliers" of the type TEU-167d (only their ø125-mm front disc is coated on the inside by a thick, ~0.5 µm Al layer, which permits such multipliers to detect primarily daemons flying inside them from the base to the disc) has made it possible for us to detect in one experiment, at a confidence level of >3σ, a flux of daemons captured from NEACHOs into Geocentric Earth-Surface-Crossing Orbits, as well as to record a decrease in the velocity of these objects from ~10 to ~7 km/s in a characteristic time of ~1 month resulting from their being slowed down in transits through the Earth's body. Keywords: DM detection; Planck black holes; DM objects' interaction with matter PACS Nos.: 95.35.+d Introduction. On the Interaction of the Daemon with MatterAny object can be detected only through its interaction with matter. The fairly strong interaction with matter of daemons, these negative, multiply electrically charged objects of tentatively Planck nature [1-5], makes the task facing a researcher a far from trivial, manyfaceted problem. We are going to consider (and use) here only some of its aspects.Electromagnetic capture by a negative daemon, say, of a Zn nucleus in the ZnS(Ag) scintillator gives rise to excitation of the nucleus, with the ensuing ejection of a host of particles (electrons, nucleons, γ's) and generation of scintillations similar in shape to the ones caused by α-particles (Heavy Particle Scintillations -HPSs) [6]. Such capture of a nucleus in a fairly thick internal metallic (e.g., Al) coating of a PM tube also initiates emission of electrons. These electrons, similar to the photoelectrons, undergo in a PM tube trivial multiplication, which gives rise to formation of an electric signal at the instrument output [7].In our previous publication [8], we have reported on a successful detection of daemons with a TEU-167 (Dark Electron Multiplier, DEM), a modified FEU-167 photoelectron multiplier, in which not only the rear (conical) and side (cylindrical) surfaces of the cathode section of the bulb, but the front disc (ø125 mm) as well, were coated on the inside with a fairly thick (~0.5 µm) aluminum film.The results obtained in the experiment were very promising for the first attempt. These DEM experiments not only have corroborated the existence of a diurnal variation in the daemon flux from NEACHOs [8,9], which followed from celestial mechanics considerations, but offered also a lower estimate of its maximum morning level f ≥ 3.4×10 -7 cm -2 s -1 . The measurements were conducted in March 2009. The response o...

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Towards Special Daemon-Sensitive Electron Multiplier: Positive Outcome of March 2009 Experiment

Cited by 5 publications

References 20 publications

Dark Matter Investigation by Dama at Gran Sasso

Dark Matter Investigation by Dama at Gran Sasso

Daemons: Detection at Pulkovo, Gran Sasso and Soudan

Now the Dark Electron Multiplier Does Sense Direction of the Daemon Motion

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