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Search Results: 1 - 10 of 50529 matches for " Y. Kamyshkov "
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Neutron-Antineutron Oscillations
Yuri Kamyshkov
Physics , 2002,
Abstract: Experimental observation of nucleon instability is one of the missing key components required for the explanation of baryon asymmetry of the universe. Proton decays with the modes and rates predicted by(B-L)-conserving schemes of Grand Unification are not observed experimentally. There are reasons to believe that (B-L) might not be conserved in nature, thus leading to the nucleon decay into lepton+(X) and to phenomena such as Majorana masses of neutrinos, neutrinoless double-beta decays, and most spectacularly to the transitions of neutron to anti-neutron. The energy scale where (B-L) violation takes place cannot be predicted by theory and therefore has to be explored by experiments. Different experimental approaches to searching for (B-L)-violating transition of neutron to antineutron are discussed in this paper. Most powerful search for neutron to antineutron transitions can be performed in a new reactor-based experiment at HFIR reactor (ORNL) where sensitivity can be >1,000 times higher than in the previous experiments.
Signatures of Nucleon Disappearance in Large Underground Detectors
Yuri Kamyshkov,Edwin Kolbe
Physics , 2002, DOI: 10.1103/PhysRevD.67.076007
Abstract: For neutrons bound inside nuclei, baryon instability can manifest itself as a decay into undetectable particles (e.g., $\it n \to \nu \nu \bar{\nu} $), i.e., as a disappearance of a neutron from its nuclear state. If electric charge is conserved, a similar disappearance is impossible for a proton. The existing experimental lifetime limit for neutron disappearance is 4-7 orders of magnitude lower than the lifetime limits with detectable nucleon decay products in the final state [PDG2000]. In this paper we calculated the spectrum of nuclear de-excitations that would result from the disappearance of a neutron or two neutrons from $^{12}$C. We found that some de-excitation modes have signatures that are advantageous for detection in the modern high-mass, low-background, and low-threshold underground detectors, where neutron disappearance would result in a characteristic sequence of time- and space-correlated events. Thus, in the KamLAND detector [Kamland], a time-correlated triple coincidence of a prompt signal, a captured neutron, and a $\beta^{+}$ decay of the residual nucleus, all originating from the same point in the detector, will be a unique signal of neutron disappearance allowing searches for baryon instability with sensitivity 3-4 orders of magnitude beyond the present experimental limits.
Bounds on new light particles from high-energy and very small momentum transfer np elastic scattering data
Kamyshkov, Yuri;Tithof, Jeffrey;Vysotsky, Mikhail
High Energy Physics - Phenomenology , 2008, DOI: 10.1103/PhysRevD.78.114029
Abstract: We found that spin-one new light particle exchanges are strongly bounded by high-energy and small momentum transfer np elastic scattering data; the analogous bound for a scalar particle is considerably weaker, while for a pseudoscalar particle no bounds can be set. These bounds are compared with the bounds extracted from low-energy n-Pb scattering experiments and from the bounds of pi0 and K+ meson decays.
Proposal for U.S. participation in Double-CHOOZ: A New theta-13 Experiment at the Chooz Reactor
S. Berridge,W. Bugg,J. Busenitz,S. Dazeley,G. Drake,Y. Efremenko,M. Goodman,J. Grudzinski,V. Guarino,G. Horton-Smith,Y. Kamyshkov,T. Kutter,C. Lane,J. LoSecco,R. McNeil,W. Metcalf,D. Reyna,I. Stancu,R. Svoboda,R. Talaga
Physics , 2004,
Abstract: It has recently been widely recognized that a reactor anti-neutrino disappearance experiment with two or more detectors is one of the most cost-effective ways to extend our reach in sensitivity for the neutrino mixing angle theta-13 without ambiguities from CP violation and matter effects. The physics capabilities of a new reactor experiment together with superbeams and neutrino factories have also been studied but these latter are considered by many to be more ambitious projects due to their higher costs, and hence to be farther in the future. We propose to contribute to an international collaboration to modify the existing neutrino physics facility at the Chooz-B Nuclear Power Station in France. The experiment, known as Double-CHOOZ, is expected to reach a sensitivity of sine squared of twice the mixing angle > 0.03 over a three year run, 2008-2011. This would cover roughly 85% of the remaining allowed region. The costs and time to first results for this critical parameter can be minimized since our project takes advantage of an existing infrastructure.
Proposal for an Electron Antineutrino Disappearance Search Using High-Rate 8Li Production and Decay
A. Bungau,A. Adelmann,J. R. Alonso,W. Barletta,R. Barlow,L. Bartoszek,L. Calabretta,A. Calanna,D. Campo,J. M. Conrad,Z. Djurcic,Y. Kamyshkov,M. H. Shaevitz,I. Shimizu,T. Smidt,J. Spitz,M. Wascko,L. A. Winslow,J. J. Yang
Physics , 2012, DOI: 10.1103/PhysRevLett.109.141802
Abstract: This paper introduces a novel, high-intensity source of electron antineutrinos from the production and subsequent decay of 8Li. When paired with an existing ~1 kton scintillator-based detector, this =6.4 MeV source opens a wide range of possible searches for beyond standard model physics via studies of the inverse beta decay interaction. In particular, the experimental design described here has unprecedented sensitivity to electron antineutrino disappearance at $\Delta m^2\sim$ 1 eV$^2$ and features the ability to distinguish between the existence of zero, one, and two sterile neutrinos.
Cost-effective Design Options for IsoDAR
A. Adelmann,J. R. Alonso,W. Barletta,R. Barlow,L. Bartoszek,A. Bungau,L. Calabretta,A. Calanna,D. Campo,J. M. Conrad,Z. Djurcic,Y. Kamyshkov,H. Owen,M. H. Shaevitz,I. Shimizu,T. Smidt,J. Spitz,M. Toups,M. Wascko,L. A. Winslow,J. J. Yang
Physics , 2012,
Abstract: This whitepaper reviews design options for the IsoDAR electron antineutrino source. IsoDAR is designed to produce $2.6 \times 10^{22}$ electron antineutrinos per year with an average energy of 6.4 MeV, using isotope decay-at-rest. Aspects which must be balanced for cost-effectiveness include: overall cost; rate and energy distribution of the electron antineutrino flux and backgrounds; low technical risk; compactness; simplicity of underground construction and operation; reliability; value to future neutrino physics programs; and value to industry. We show that the baseline design outlined here is the most cost effective.
DUSEL Theory White Paper
Raby, S.;Walker, T.;Babu, K. S.;Baer, H.;Balantekin, A. B.;Barger, V.;Berezhiani, Z.;de Gouvea, A.;Dermisek, R.;Dolgov, A.;Perez, P. Fileviez;Gabadadze, G.;Gal, A.;Gondolo, P.;Haxton, W.;Kamyshkov, Y.;Kayser, B.;Kearns, E.;Kopeliovich, B.;Lande, K.;Marfatia, D.;Mohapatra, R. N.;Nath, P.;Nomura, Y.;Olive, K. A.;Pati, J.;Profumo, S.;Shrock, R.;Tavartkiladze, Z.;Whisnant, K.;Wolfenstein, L.
High Energy Physics - Phenomenology , 2008,
Abstract: The NSF has chosen the site for the Deep Underground Science and Engineering Laboratory (DUSEL) to be in Lead, South Dakota. In fact, the state of South Dakota has already stepped up to the plate and contributed its own funding for the proposed lab, see The final decision by NSF for funding the Initial Suite of Experiments for DUSEL will be made early in 2009. At that time the NSF Science Board must make a decision. Of order 200 experimentalists have already expressed an interest in performing experiments at DUSEL. In order to assess the interest of the theoretical community, the Center for Cosmology and Astro-Particle Physics (CCAPP) at The Ohio State University (OSU) organized a 3-day DUSEL Theory Workshop in Columbus, Ohio from April 4 - 6, 2008. The workshop focused on the scientific case for six proposed experiments for DUSEL: long baseline neutrino oscillations, proton decay, dark matter, astrophysical neutrinos, neutrinoless double beta decay and N-Nbar oscillations. The outcome of this workshop is the DUSEL Theory White paper addressing the scientific case at a level which may be useful in the decision making process for policy makers at the NSF and in the U.S. Congress. In order to assess the physics interest in the DUSEL project we have posted the DUSEL Theory White paper on the following CCAPP link . Please read the white paper and, if you are interested, use the link to show your support by co-signing the white paper.
The OscSNS White Paper
OscSNS Collaboration,R. Allen,F. T. Avignone,J. Boissevain,Y. Efremenko,M. Elnimr,T. Gabriel,F. G. Garcia,G. T. Garvey,T. Handler,W. Huelsnitz,R. Imlay,Y. Kamyshkov,J. M. Link,W. C. Louis,G. B. Mills,S. R. Mishra,B. Osmanov,Z. Pavlovic,H. Ray,B. P. Roe,C. Rosenfeld,I. Stancu,R. Svoboda,R. Tayloe,R. Van de Water,M. J. Wetstein,D. H. White,M. Yeh
Physics , 2013,
Abstract: There exists a need to address and resolve the growing evidence for short-baseline neutrino oscillations and the possible existence of sterile neutrinos. Such non-standard particles require a mass of $\sim 1$ eV/c$^2$, far above the mass scale associated with active neutrinos, and were first invoked to explain the LSND $\bar \nu_\mu \rightarrow \bar \nu_e$ appearance signal. More recently, the MiniBooNE experiment has reported a $2.8 \sigma$ excess of events in antineutrino mode consistent with neutrino oscillations and with the LSND antineutrino appearance signal. MiniBooNE also observed a $3.4 \sigma$ excess of events in their neutrino mode data. Lower than expected neutrino-induced event rates using calibrated radioactive sources and nuclear reactors can also be explained by the existence of sterile neutrinos. Fits to the world's neutrino and antineutrino data are consistent with sterile neutrinos at this $\sim 1$ eV/c$^2$ mass scale, although there is some tension between measurements from disappearance and appearance experiments. In addition to resolving this potential major extension of the Standard Model, the existence of sterile neutrinos will impact design and planning for all future neutrino experiments. It should be an extremely high priority to conclusively establish if such unexpected light sterile neutrinos exist. The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory, built to usher in a new era in neutron research, provides a unique opportunity for US science to perform a definitive world-class search for sterile neutrinos.
The Physics and Nuclear Nonproliferation Goals of WATCHMAN: A WAter CHerenkov Monitor for ANtineutrinos
M. Askins,M. Bergevin,A. Bernstein,S. Dazeley,S. T. Dye,T. Handler,A. Hatzikoutelis,D. Hellfeld,P. Jaffke,Y. Kamyshkov,B. J. Land,J. G. Learned,P. Marleau,C. Mauger,G. D. Orebi Gann,C. Roecker,S. D. Rountree,T. M. Shokair,M. B. Smy,R. Svoboda,M. Sweany,M. R. Vagins,K. A. van Bibber,R. B. Vogelaar,M. J. Wetstein,M. Yeh
Physics , 2015,
Abstract: This article describes the physics and nonproliferation goals of WATCHMAN, the WAter Cherenkov Monitor for ANtineutrinos. The baseline WATCHMAN design is a kiloton scale gadolinium-doped (Gd) light water Cherenkov detector, placed 13 kilometers from a civil nuclear reactor in the United States. In its first deployment phase, WATCHMAN will be used to remotely detect a change in the operational status of the reactor, providing a first- ever demonstration of the potential of large Gd-doped water detectors for remote reactor monitoring for future international nuclear nonproliferation applications. During its first phase, the detector will provide a critical large-scale test of the ability to tag neutrons and thus distinguish low energy electron neutrinos and antineutrinos. This would make WATCHMAN the only detector capable of providing both direction and flavor identification of supernova neutrinos. It would also be the third largest supernova detector, and the largest underground in the western hemisphere. In a follow-on phase incorporating the IsoDAR neutrino beam, the detector would have world-class sensitivity to sterile neutrino signatures and to non-standard electroweak interactions (NSI). WATCHMAN will also be a major, U.S. based integration platform for a host of technologies relevant for the Long-Baseline Neutrino Facility (LBNF) and other future large detectors. This white paper describes the WATCHMAN conceptual design,and presents the results of detailed simulations of sensitivity for the project's nonproliferation and physics goals. It also describes the advanced technologies to be used in WATCHMAN, including high quantum efficiency photomultipliers, Water-Based Liquid Scintillator (WbLS), picosecond light sensors such as the Large Area Picosecond Photo Detector (LAPPD), and advanced pattern recognition and particle identification methods.
Whitepaper on the DAEdALUS Program
C. Aberle,A. Adelmann,J. Alonso,W. A. Barletta,R. Barlow,L. Bartoszek,A. Bungau,A. Calanna,D. Campo,L. Calabretta,L. Celona,G. Collin,J. M. Conrad,A. de Gouvea,Z. Djurcic,S. Gammino,D. Garisto,R. Gutierrez,R. R. Johnson,Y. Kamyshkov,G. Karagiorgi,A. Kolano,F. Labrecque,W. Loinaz,H. Okuno,V. Papavassiliou,K. Scholberg,M. H. Shaevitz,I. Shimizu,J. Spitz,M. Skuhersky,K. Terao,M. Toups,M. Vagins,D. Winklehner,L. A. Winslow,J. J. Yang
Physics , 2013,
Abstract: This whitepaper describes the status of the DAEdALUS program for development of high power cyclotrons as of the time of the final meeting of the Division of Particles and Fields 2013 Community Study ("Snowmass"). We report several new results, including a measurement capability between 4 and 12 degrees on the CP violating parameter in the neutrino sector. Past results, including the capability of the IsoDAR high Dm^2 antielectron neutrino disappearance search, are reviewed. A discussion of the R&D successes, including construction of a beamline teststand, and future plans are provided. This text incorporates short whitepapers written for subgroups in the Intensity Frontier and Frontier Capabilities Working Groups that are available on the Snowmass website.
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