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Book ; Online: $^6$Li-loaded liquid scintillators produced by direct dissolution of compounds in diisopropylnaphthalene (DIPN)

Zaitseva, N. P. / Carman, M. L. / Ford, M. J. / Glenn, A. M. / Roca, C. / Durham, S. / Sutanto, F. / Dazeley, S. A. / Bowden, N. S.

2023

Abstract: The paper describes preparation of $^6$Li-loaded liquid scintillators by methods involving direct dissolution of $^6$Li salts in the commercial diisopropylnaphthalene (DIPN) solvent, without the formation of water-in-oil emulsions. Methods include ... ...

Abstract	The paper describes preparation of $^6$Li-loaded liquid scintillators by methods involving direct dissolution of $^6$Li salts in the commercial diisopropylnaphthalene (DIPN) solvent, without the formation of water-in-oil emulsions. Methods include incorporation of $^6$Li that, unlike previously reported formulations, does not require additions of water or a strong acid such as hydrochloric acid (HCl). Results of the conducted experiments show that dissolution of aromatic and aliphatic $^6$Li salts in DIPN can be easily achieved at 0.1- 0.3% by weight of atomic $^6$Li, using small additions of waterless surfactants, or mild carboxylic acids. An alternative way suggests incorporation of $^6$Li as a part of a surfactant molecule that can be dissolved in DIPN without any solubilizing additions. Proposed methods enable preparation of efficient $^6$Li-loaded liquid scintillators that, at a large scale of 50 cm, exhibit good pulse shape discrimination (PSD) properties combined with up to 107% of light output and up to 115% of the attenuation length measured relative to standard undoped EJ-309 liquid scintillator. Comment: Submitted to Nuclear Instruments and Methods in Physics Research A
Keywords	Physics - Instrumentation and Detectors
Subject code	660
Publishing date	2023-03-28
Publishing country	us
Document type	Book ; Online
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Book ; Online: SANDD

Sutanto, F. / Classen, T. M. / Dazeley, S. A. / Duvall, M. J. / Jovanovic, I. / Li, V. A. / Mabe, A. N. / Reedy, E. T. E. / Wu, T.

A directional antineutrino detector with segmented 6Li-doped pulse-shape-sensitive plastic scintillator

2021

Abstract: We present a characterization of a small (9-liter) and mobile 0.1% 6Li-doped pulse-shape-sensitive plastic scintillator antineutrino detector called SANDD (Segmented AntiNeutrino Directional Detector), constructed for the purpose of near-field reactor ... ...

Abstract	We present a characterization of a small (9-liter) and mobile 0.1% 6Li-doped pulse-shape-sensitive plastic scintillator antineutrino detector called SANDD (Segmented AntiNeutrino Directional Detector), constructed for the purpose of near-field reactor monitoring with sensitivity to antineutrino direction. SANDD comprises three different types of module. A detailed Monte Carlo simulation code was developed to match and validate the performance of each of the three modules. The combined model was then used to produce a prediction of the performance of the entire detector. Analysis cuts were established to isolate antineutrino inverse beta decay events while rejecting large fraction of backgrounds. The neutron and positron detection efficiencies are estimated to be 34.8% and 80.2%, respectively, while the coincidence detection efficiency is estimated to be 71.7%, resulting in inverse beta decay detection efficiency of 20.05 +/- 0.2%(stat.) +/- 2.1%(syst.). The predicted directional sensitivity of SANDD produces an uncertainty of 20 degree in the azimuthal direction per 100 detected antineutrino events.
Keywords	Physics - Instrumentation and Detectors ; High Energy Physics - Experiment
Subject code	621
Publishing date	2021-04-30
Publishing country	us
Document type	Book ; Online
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Article: Social categorization and empathy for outgroup members.

Tarrant, Mark / Dazeley, Sarah / Cottom, Tom

The British journal of social psychology

2009 Volume 48, Issue Pt 3, Page(s) 427–446

Abstract: Three experiments (N=370) investigated the effects of social categorization on the experience of empathy. In Experiment 1, university students reported their empathy for, and intentions to help, a student who described a distressful experience. As ... ...

Abstract	Three experiments (N=370) investigated the effects of social categorization on the experience of empathy. In Experiment 1, university students reported their empathy for, and intentions to help, a student who described a distressful experience. As predicted, participants reported stronger empathy and helping intentions when the student belonged to an ingroup compared to an outgroup university. Experiments 2 and 3 demonstrated that stronger empathy for outgroup members was experienced following the activation of an ingroup norm that prescribed the experience of this emotion. Activating this norm also led to the expression of more positive attitudes towards the outgroup (Experiment 3), and empathy fully mediated this effect. These findings indicate that like other emotions, empathy is influenced by social categorization processes.
MeSH term(s)	Adolescent ; Emotions ; Empathy ; Female ; Helping Behavior ; Humans ; Intention ; Male ; Motivation ; Social Distance ; Social Identification ; Social Values ; Stereotyping ; Students/psychology ; Young Adult
Language	English
Publishing date	2009-09
Publishing country	England
Document type	Journal Article
ZDB-ID	625325-8
ISSN	2044-8309 ; 0144-6665
ISSN (online)	2044-8309
ISSN	0144-6665
DOI	10.1348/014466608X373589
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Book ; Online: A Call to Arms Control

Akindele, T. / Anderson, T. / Anderssen, E. / Askins, M. / Bohles, M. / Bacon, A. J. / Bagdasarian, Z. / Baldoni, A. / Barna, A. / Barros, N. / Bartoszek, L. / Bat, A. / Beier, E. W. / Benson, T. / Bergevin, M. / Bernstein, A. / Birrittella, B. / Blucher, E. / Boissevain, J. /

Bonventre, R. / Borusinki, J. / Bourret, E. / Brown, D. / Callaghan, E. J. / Caravaca, J. / Chen, M. / Cowen, D. F. / Crow, B. / Dalnoki-Veress, F. / Danielson, D. / Dazeley, S. / Diwan, M. / Djurcic, Z. / Druetzler, A. / Dye, S. / Dye, S. T. / Eisch, J. / Elagin, A. / Enqvist, T. / Erlandson, Andrew / Fahrendholz, U. / Fienberg, A. / Fischer, V. / Frankiewicz, K. / Garzelli, M. V. / Gooding, D. / Graham, C. / Grant, C. / Griskevich, J. / Guffanti, D.

Synergies between Nonproliferation Applications of Neutrino Detectors and Large-Scale Fundamental Neutrino Physics Experiments

2022

Abstract: The High Energy Physics community can benefit from a natural synergy in research activities into next-generation large-scale water and scintillator neutrino detectors, now being studied for remote reactor monitoring, discovery and exclusion applications ... ...

Abstract	The High Energy Physics community can benefit from a natural synergy in research activities into next-generation large-scale water and scintillator neutrino detectors, now being studied for remote reactor monitoring, discovery and exclusion applications in cooperative nonproliferation contexts. Since approximately 2010, US nonproliferation researchers, supported by the National Nuclear Security Administration (NNSA), have been studying a range of possible applications of relatively large (100 ton) to very large (hundreds of kiloton) water and scintillator neutrino detectors. In parallel, the fundamental physics community has been developing detectors at similar scales and with similar design features for a range of high-priority physics topics, primarily in fundamental neutrino physics. These topics include neutrino oscillation studies at beams and reactors, solar, and geological neutrino measurements, supernova studies, and others. Examples of ongoing synergistic work at U.S. national laboratories and universities include prototype gadolinium-doped water and water-based and opaque scintillator test-beds and demonstrators, extensive testing and industry partnerships related to large area fast position-sensitive photomultiplier tubes, and the development of concepts for a possible underground kiloton-scale water-based detector for reactor monitoring and technology demonstrations. Some opportunities for engagement between the two communities include bi-annual Applied Antineutrino Physics conferences, collaboration with U.S. National Laboratories engaging in this research, and occasional NNSA funding opportunities supporting a blend of nonproliferation and basic science R&D, directed at the U.S. academic community. Comment: contribution to Snowmass 2021
Keywords	Physics - Instrumentation and Detectors ; High Energy Physics - Experiment ; Physics - Physics and Society
Subject code	306
Publishing date	2022-02-28
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: Directionally Accelerated Detection of an Unknown Second Reactor with Antineutrinos for Mid-Field Nonproliferation Monitoring

Danielson, D. L. / Akindele, O. A. / Askins, M. / Bergevin, M. / Bernstein, A. / Burns, J. / Carroll, A. / Coleman, J. / Collins, R. / Connor, C. / Cowen, D. F. / Dalnoki-Veress, F. / Dazeley, S. / Diwan, M. V. / Duron, J. / Dye, S. T. / Eisch, J. / Ezeribe, A. / Fischer, V. /

Foster, R. / Frankiewicz, K. / Grant, C. / Gribble, J. / He, J. / Holligan, C. / Holt, G. / Huang, W. / Jovanovic, I. / Kneale, L. / Korkeila, L. / Kudryavtsev, V. A. / Kunkle, P. / Mak, R. Lap Keung / Learned, J. G. / Lewis, P. / Li, V. A. / Liu, X. / Malek, M. / Maricic, J. / Mauger, C. / McCauley, N. / Metelko, C. / Mills, R. / Muheim, F. / Murphy, A. St. J / Needham, M. / Nishimura, K. / Gann, G. D. Orebi / Paling, S. M. / Pershing, T. / Pickard, L. / Pinheiro, B. / Quillin, S. / Rogers, S. / Scarff, A. / Schnellbach, Y. / Scovell, P. R. / Shaw, T. / Shebalin, V. / Smith, G. D. / Smy, M. B. / Spooner, N. / Sutanto, F. / Svoboda, R. / Thompson, L. F. / Toth, C. / Vagins, M. R. / Ventura, S. / Wetstein, M. J. / Yeh, M.

2019

Abstract: When monitoring a reactor site for nuclear nonproliferation purposes, the presence of an unknown or hidden nuclear reactor could be obscured by the activities of a known reactor of much greater power nearby. Thus when monitoring reactor activities by the ...

Abstract	When monitoring a reactor site for nuclear nonproliferation purposes, the presence of an unknown or hidden nuclear reactor could be obscured by the activities of a known reactor of much greater power nearby. Thus when monitoring reactor activities by the observation of antineutrino emissions, one must discriminate known background reactor fluxes from possible unknown reactor signals under investigation. To quantify this discrimination, we find the confidence to reject the (null) hypothesis of a single proximal reactor, by exploiting directional antineutrino signals in the presence of a second, unknown reactor. In particular, we simulate the inverse beta decay (IBD) response of a detector filled with a 1 kT fiducial mass of Gadolinium-doped liquid scintillator in mineral oil. We base the detector geometry on that of WATCHMAN, an upcoming antineutrino monitoring experiment soon to be deployed at the Boulby mine in the United Kingdom whose design and deployment will be detailed in a forthcoming white paper. From this simulation, we construct an analytical model of the IBD event distribution for the case of one $4\mathrm{\ GWt}\pm2\%$ reactor 25 km away from the detector site, and for an additional, unknown, 35 MWt reactor 3 to 5 km away. The effects of natural-background rejection cuts are approximated. Applying the model, we predict $3\sigma$ confidence to detect the presence of an unknown reactor within five weeks, at standoffs of 3 km or nearer. For more distant unknown reactors, the $3\sigma$ detection time increases significantly. However, the relative significance of directional sensitivity also increases, providing up to an eight week speedup to detect an unknown reactor at 5 km away. Therefore, directionally sensitive antineutrino monitoring can accelerate the mid-field detection of unknown reactors whose operation might otherwise be masked by more powerful reactors in the vicinity. Comment: 9 pages, 10 figures
Keywords	Physics - Instrumentation and Detectors ; High Energy Physics - Experiment ; High Energy Physics - Phenomenology ; Physics - Applied Physics
Subject code	660
Publishing date	2019-09-10
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Results from a search for light-mass dark matter with a p-type point contact germanium detector.

Aalseth, C E / Barbeau, P S / Bowden, N S / Cabrera-Palmer, B / Colaresi, J / Collar, J I / Dazeley, S / de Lurgio, P / Fast, J E / Fields, N / Greenberg, C H / Hossbach, T W / Keillor, M E / Kephart, J D / Marino, M G / Miley, H S / Miller, M L / Orrell, J L / Radford, D C /

Reyna, D / Tench, O / Van Wechel, T D / Wilkerson, J F / Yocum, K M

Physical review letters

2011 Volume 106, Issue 13, Page(s) 131301

Abstract: We report on several features in the energy spectrum from an ultralow-noise germanium detector operated deep underground. By implementing a new technique able to reject surface events, a number of cosmogenic peaks can be observed for the first time. We ... ...

Abstract	We report on several features in the energy spectrum from an ultralow-noise germanium detector operated deep underground. By implementing a new technique able to reject surface events, a number of cosmogenic peaks can be observed for the first time. We discuss an irreducible excess of bulklike events below 3 keV in ionization energy. These could be caused by unknown backgrounds, but also dark matter interactions consistent with DAMA/LIBRA. It is not yet possible to determine their origin. Improved constraints are placed on a cosmological origin for the DAMA/LIBRA effect.
Language	English
Publishing date	2011-04-01
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.106.131301
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Article ; Online: First results from the LUX dark matter experiment at the Sanford underground research facility.

Akerib, D S / Araújo, H M / Bai, X / Bailey, A J / Balajthy, J / Bedikian, S / Bernard, E / Bernstein, A / Bolozdynya, A / Bradley, A / Byram, D / Cahn, S B / Carmona-Benitez, M C / Chan, C / Chapman, J J / Chiller, A A / Chiller, C / Clark, K / Coffey, T /

Currie, A / Curioni, A / Dazeley, S / de Viveiros, L / Dobi, A / Dobson, J / Dragowsky, E M / Druszkiewicz, E / Edwards, B / Faham, C H / Fiorucci, S / Flores, C / Gaitskell, R J / Gehman, V M / Ghag, C / Gibson, K R / Gilchriese, M G D / Hall, C / Hanhardt, M / Hertel, S A / Horn, M / Huang, D Q / Ihm, M / Jacobsen, R G / Kastens, L / Kazkaz, K / Knoche, R / Kyre, S / Lander, R / Larsen, N A / Lee, C / Leonard, D S / Lesko, K T / Lindote, A / Lopes, M I / Lyashenko, A / Malling, D C / Mannino, R / McKinsey, D N / Mei, D-M / Mock, J / Moongweluwan, M / Morad, J / Morii, M / Murphy, A St J / Nehrkorn, C / Nelson, H / Neves, F / Nikkel, J A / Ott, R A / Pangilinan, M / Parker, P D / Pease, E K / Pech, K / Phelps, P / Reichhart, L / Shutt, T / Silva, C / Skulski, W / Sofka, C J / Solovov, V N / Sorensen, P / Stiegler, T / O'Sullivan, K / Sumner, T J / Svoboda, R / Sweany, M / Szydagis, M / Taylor, D / Tennyson, B / Tiedt, D R / Tripathi, M / Uvarov, S / Verbus, J R / Walsh, N / Webb, R / White, J T / White, D / Witherell, M S / Wlasenko, M / Wolfs, F L H / Woods, M / Zhang, C

Physical review letters

2014 Volume 112, Issue 9, Page(s) 91303

Abstract: The Large Underground Xenon (LUX) experiment is a dual-phase xenon time-projection chamber operating at the Sanford Underground Research Facility (Lead, South Dakota). The LUX cryostat was filled for the first time in the underground laboratory in ... ...

Abstract	The Large Underground Xenon (LUX) experiment is a dual-phase xenon time-projection chamber operating at the Sanford Underground Research Facility (Lead, South Dakota). The LUX cryostat was filled for the first time in the underground laboratory in February 2013. We report results of the first WIMP search data set, taken during the period from April to August 2013, presenting the analysis of 85.3 live days of data with a fiducial volume of 118 kg. A profile-likelihood analysis technique shows our data to be consistent with the background-only hypothesis, allowing 90% confidence limits to be set on spin-independent WIMP-nucleon elastic scattering with a minimum upper limit on the cross section of 7.6 × 10(-46) cm(2) at a WIMP mass of 33 GeV/c(2). We find that the LUX data are in disagreement with low-mass WIMP signal interpretations of the results from several recent direct detection experiments.
Language	English
Publishing date	2014-03-07
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.112.091303
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Book ; Online: LUXSim

Akerib, D. S. / Bai, X. / Bedikian, S. / Bernard, E. / Bernstein, A. / Bradley, A. / Cahn, S. B. / Carmona-Benitez, M. C. / Carr, D. / Chapman, J. J. / Clark, K. / Classen, T. / Coffey, T. / Dazeley, S. / de Viveiros, L. / Dragowsky, M. / Druszkiewicz, E. / Faham, C. H. / Fiorucci, S. /

Gaitskell, R. J. / Gibson, K. R. / Hall, C. / Hanhardt, M. / Holbrook, B. / Ihm, M. / Jacobsen, R. G. / Kastens, L. / Kazkaz, K. / Lander, R. / Larsen, N. / Lee, C. / Leonard, D. / Lesko, K. / Lyashenko, A. / Malling, D. C. / Mannino, R. / McKinsey, D. N. / Mei, D. -M / Mock, J. / Morii, M. / Nelson, H. / Nikkel, J. A. / Pangilinan, M. / Parker, P. D. / Phelps, P. / Shutt, T. / Skulski, W. / Sorensen, P. / Spaans, J. / Stiegler, T. / Svoboda, R. / Sweany, M. / Szydagis, M. / Thomson, J. / Tripathi, M. / Verbus, J. R. / Walsh, N. / Webb, R. / White, J. T. / Wlasenko, M. / Wolfs, F. L. H. / Woods, M. / Zhang, C.

A Component-Centric Approach to Low-Background Simulations

2011

Abstract: Geant4 has been used throughout the nuclear and high-energy physics community to simulate energy depositions in various detectors and materials. These simulations have mostly been run with a source beam outside the detector. In the case of low-background ...

Abstract	Geant4 has been used throughout the nuclear and high-energy physics community to simulate energy depositions in various detectors and materials. These simulations have mostly been run with a source beam outside the detector. In the case of low-background physics, however, a primary concern is the effect on the detector from radioactivity inherent in the detector parts themselves. From this standpoint, there is no single source or beam, but rather a collection of sources with potentially complicated spatial extent. LUXSim is a simulation framework used by the LUX collaboration that takes a component-centric approach to event generation and recording. A new set of classes allows for multiple radioactive sources to be set within any number of components at run time, with the entire collection of sources handled within a single simulation run. Various levels of information can also be recorded from the individual components, with these record levels also being set at runtime. This flexibility in both source generation and information recording is possible without the need to recompile, reducing the complexity of code management and the proliferation of versions. Within the code itself, casting geometry objects within this new set of classes rather than as the default Geant4 classes automatically extends this flexibility to every individual component. No additional work is required on the part of the developer, reducing development time and increasing confidence in the results. We describe the guiding principles behind LUXSim, detail some of its unique classes and methods, and give examples of usage. * Corresponding author, kareem@llnl.gov Comment: 45 pages, 15 figures
Keywords	Physics - Data Analysis ; Statistics and Probability ; High Energy Physics - Experiment ; Nuclear Experiment
Subject code	621
Publishing date	2011-11-08
Publishing country	us
Document type	Book ; Online
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Article: Precision measurement of neutrino oscillation parameters with KamLAND.

Abe, S / Ebihara, T / Enomoto, S / Furuno, K / Gando, Y / Ichimura, K / Ikeda, H / Inoue, K / Kibe, Y / Kishimoto, Y / Koga, M / Kozlov, A / Minekawa, Y / Mitsui, T / Nakajima, K / Nakamura, K / Nakamura, M / Owada, K / Shimizu, I /

Shimizu, Y / Shirai, J / Suekane, F / Suzuki, A / Takemoto, Y / Tamae, K / Terashima, A / Watanabe, H / Yonezawa, E / Yoshida, S / Busenitz, J / Classen, T / Grant, C / Keefer, G / Leonard, D S / McKee, D / Piepke, A / Decowski, M P / Detwiler, J A / Freedman, S J / Fujikawa, B K / Gray, F / Guardincerri, E / Hsu, L / Kadel, R / Lendvai, C / Luk, K-B / Murayama, H / O'Donnell, T / Steiner, H M / Winslow, L A / Dwyer, D A / Jillings, C / Mauger, C / McKeown, R D / Vogel, P / Zhang, C / Berger, B E / Lane, C E / Maricic, J / Miletic, T / Batygov, M / Learned, J G / Matsuno, S / Pakvasa, S / Foster, J / Horton-Smith, G A / Tang, A / Dazeley, S / Downum, K E / Gratta, G / Tolich, K / Bugg, W / Efremenko, Y / Kamyshkov, Y / Perevozchikov, O / Karwowski, H J / Markoff, D M / Tornow, W / Heeger, K M / Piquemal, F / Ricol, J-S

Physical review letters

2008 Volume 100, Issue 22, Page(s) 221803

Abstract: The KamLAND experiment has determined a precise value for the neutrino oscillation parameter Deltam21(2) and stringent constraints on theta12. The exposure to nuclear reactor antineutrinos is increased almost fourfold over previous results to 2.44 x 10( ... ...

Abstract	The KamLAND experiment has determined a precise value for the neutrino oscillation parameter Deltam21(2) and stringent constraints on theta12. The exposure to nuclear reactor antineutrinos is increased almost fourfold over previous results to 2.44 x 10(32) proton yr due to longer livetime and an enlarged fiducial volume. An undistorted reactor nu[over]e energy spectrum is now rejected at >5sigma. Analysis of the reactor spectrum above the inverse beta decay energy threshold, and including geoneutrinos, gives a best fit at Deltam21(2)=7.58(-0.13)(+0.14)(stat) -0.15+0.15(syst) x 10(-5) eV2 and tan2theta12=0.56(-0.07)+0.10(stat) -0.06+0.10(syst). Local Deltachi2 minima at higher and lower Deltam21(2) are disfavored at >4sigma. Combining with solar neutrino data, we obtain Deltam21(2)=7.59(-0.21)+0.21 x 10(-5) eV2 and tan2theta12=0.47(-0.05)+0.06.
Language	English
Publishing date	2008-06-06
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.100.221803
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Article: Search for the invisible decay of neutrons with KamLAND.

Araki, T / Enomoto, S / Furuno, K / Gando, Y / Ichimura, K / Ikeda, H / Inoue, K / Kishimoto, Y / Koga, M / Koseki, Y / Maeda, T / Mitsui, T / Motoki, M / Nakajima, K / Nakamura, K / Ogawa, H / Ogawa, M / Owada, K / Ricol, J-S /

Shimizu, I / Shirai, J / Suekane, F / Suzuki, A / Tada, K / Takeuchi, S / Tamae, K / Tsuda, Y / Watanabe, H / Busenitz, J / Classen, T / Djurcic, Z / Keefer, G / Leonard, D S / Piepke, A / Yakushev, E / Berger, B E / Chan, Y D / Decowski, M P / Dwyer, D A / Freedman, S J / Fujikawa, B K / Goldman, J / Gray, F / Heeger, K M / Hsu, L / Lesko, K T / Luk, K-B / Murayama, H / O'Donnell, T / Poon, A W P / Steiner, H M / Winslow, L A / Jillings, C / Mauger, C / McKeown, R D / Vogel, P / Zhang, C / Lane, C E / Miletic, T / Guillian, G / Learned, J G / Maricic, J / Matsuno, S / Pakvasa, S / Horton-Smith, G A / Dazeley, S / Hatakeyama, S / Rojas, A / Svoboda, R / Dieterle, B D / Detwiler, J / Gratta, G / Ishii, K / Tolich, N / Uchida, Y / Batygov, M / Bugg, W / Efremenko, Y / Kamyshkov, Y / Kozlov, A / Nakamura, Y / Karwowski, H J / Markoff, D M / Rohm, R M / Tornow, W / Wendell, R / Chen, M-J / Wang, Y-F / Piquemal, F

Physical review letters

2006 Volume 96, Issue 10, Page(s) 101802

Abstract: The Kamioka Liquid scintillator Anti-Neutrino Detector is used in a search for single neutron or two-neutron intranuclear disappearance that would produce holes in the -shell energy level of (12)C nuclei. Such holes could be created as a result of ... ...

Abstract	The Kamioka Liquid scintillator Anti-Neutrino Detector is used in a search for single neutron or two-neutron intranuclear disappearance that would produce holes in the -shell energy level of (12)C nuclei. Such holes could be created as a result of nucleon decay into invisible modes (inv), e.g., n--> 3v or nn--> 2v. The deexcitation of the corresponding daughter nucleus results in a sequence of space and time-correlated events observable in the liquid scintillator detector. We report on new limits for one- and two-neutron disappearance: tau(n--> inv) > 5.8 x 10(29) years and tau (nn--> inv) > 1.4 x 10(30) years at 90% C.L. These results represent an improvement of factors of approximately 3 and >10(4) and over previous experiments.
Language	English
Publishing date	2006-03-17
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.96.101802
Database	MEDical Literature Analysis and Retrieval System OnLINE

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