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Search Results: 1 - 10 of 297532 matches for " J. Spitz "
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A Sterile Neutrino Search with Kaon Decay-at-rest
J. Spitz
Physics , 2012, DOI: 10.1103/PhysRevD.85.093020
Abstract: Monoenergetic muon neutrinos (235.5 MeV) from positive kaon decay-at-rest are considered as a source for an electron neutrino appearance search. In combination with a liquid argon time projection chamber based detector, such a source could provide discovery-level sensitivity to the neutrino oscillation parameter space indicative of a sterile neutrino. Current and future intense >3 GeV kinetic energy proton facilities around the world can be employed for this experimental concept.
Cross Section Measurements with Monoenergetic Muon Neutrinos
J. Spitz
Physics , 2014, DOI: 10.1103/PhysRevD.89.073007
Abstract: The monoenergetic 236 MeV muon neutrino from charged kaon decay-at-rest ($K^+ \rightarrow \mu^+ \nu_\mu$) can be used to produce a novel set of cross section measurements. Applicable for short- and long-baseline accelerator-based neutrino oscillation experiments, among others, such measurements would provide a "standard candle" for the energy reconstruction and interaction kinematics relevant for charged current neutrino events near this energy. This neutrino can also be exercised as a unique known-energy, purely weak interacting probe of the nucleus. A number of experiments are set to come online in the next few years that will be able to collect and characterize thousands of these events.
Search for neutrino-antineutrino oscillations with a reactor experiment
J. S. Diaz,T. Katori,J. Spitz,J. M. Conrad
Physics , 2013, DOI: 10.1016/j.physletb.2013.10.058
Abstract: The disappearance of reactor antineutrinos in the Double Chooz experiment is used to investigate the possibility of neutrino-antineutrino oscillations arising due to the breakdown of Lorentz invariance. We find no evidence for this phenomenon and set the first limits on 15 coefficients describing neutrino-antineutrino mixing within the framework of the Standard-Model Extension.
étude de la liaison génétique entre deux mutants de coloration chez le campagnol des champs (Microtus arvalis P.)
F Spitz, J-J Lauvergne, Colette Chassot
Genetics Selection Evolution , 1969, DOI: 10.1186/1297-9686-1-2-176b
Demonstrating a directional detector based on neon for characterizing high energy neutrons
A. Hexley,M. H. Moulai,J. Spitz,J. M. Conrad
Physics , 2015, DOI: 10.1088/1748-0221/10/11/P11010
Abstract: MITPC is a gas-based time projection chamber used for detecting fast, MeV-scale neutrons. The standard version of the detector relies on a mixture of 600~torr gas composed of 87.5% $^4$He and 12.5% CF$_4$ for precisely measuring the energy and direction of neutron-induced nuclear recoils. We describe studies performed with a prototype detector investigating the use of Ne, as a replacement for $^4$He, in the gas mixture. Our discussion focuses on the advantages of Ne as the fast neutron target for high energy neutron events ($\lesssim$100 MeV) and a demonstration that the mixture will be effective for this event class. We find that the achievable gain and transverse diffusion of drifting electrons in the Ne mixture are acceptable and that the detector uptime lost due to voltage breakdowns in the amplification plane is negligible, compared to $\sim$ 20% with the $^4$He mixture.
Oesophageal atresia
Lewis Spitz
Orphanet Journal of Rare Diseases , 2007, DOI: 10.1186/1750-1172-2-24
Abstract: Oesophageal atresia with or without tracheooesophageal fistula, OA, TOF, TEF (American)Oesophageal atresia encompasses a group of congenital anomalies comprising an interruption of the continuity of the oesophagus combined with or without a persistent communication with the trachea.Oesophageal atresia is a relatively common congenital malformation occurring in one in 2500–3000 live births. The overwhelming majority of cases of oesophageal atresia are sporadic/non-syndromic, although a small number within this non-familial group are associated with chromosomal abnormalities. Familial/syndromic cases of oesophageal atresia are extremely rare, representing less than 1% of the total. Oesophageal atresia is 2 to 3 times more common in twins [1].The first clearly documented case of oesophageal atresia, confirmed at post-mortem examination, was recorded by Thomas Gibson [2] in 1697, as follows: "About November 1696, I was sent for to an infant that would not swallow. The child seemed very desirous of food, and took what was offered it in a spoon with greediness; but when it went to swallow it, it was liked to be choked, and what should have gone down returned by the mouth and nose, and it fell into a struggling convulsive sort of fit upon it."The next recorded case was almost 150 years later by Thomas Hill [3] in 1840 who "was called, in the night, to visit Dr Webster's family". The newborn infant "made no effort to swallow but immediately convulsed and the drink which had been given returned by mouth and nose, mixed with bloody mucus". He recommended that "gently stimulating the rectum would remove the difficulty", however, when an attempt was made to do so, there was "no vestige of an anus". Hill was the first to document an associated anomaly with oesophageal atresia.Thomas Holmes [4] in 1869 was the first to suggest the possibility of operative treatment but he added "the attempt ought not, I think, be made".In 1913, Richter [5] proposed an operative plan consisting of
Observations on the origin of congenital intestinal atresia
Lewis Spitz
South African Medical Journal , 2006,
ArgoNeuT, a liquid argon time projection chamber in a low energy neutrino beam
Joshua Spitz
Physics , 2009, DOI: 10.1088/1742-6596/203/1/012108
Abstract: ArgoNeuT (Argon Neutrino Test), a NSF/DOE project at Fermilab, is the first LArTPC to go in a low energy neutrino beam and just the second LArTPC to go in a neutrino beam ever. ArgoNeuT sits just upstream of the on-axis MINOS near detector in the NuMI beamline, about 1 km from the target station and 100 m underground. The detector features a 47X40X90 cm (169 L) active volume TPC with a fully contained recirculation and purification system. Among other physics, ArgoNeuT will measure the charged-current quasi-elastic (anti-) neutrino cross section on argon at an energy of ~3 GeV.
Coherent Neutrino Scattering in Dark Matter Detectors
A. J. Anderson,J. M. Conrad,E. Figueroa-Feliciano,K. Scholberg,J. Spitz
Physics , 2011, DOI: 10.1103/PhysRevD.84.013008
Abstract: Coherent elastic neutrino- and WIMP-nucleus interaction signatures are expected to be quite similar. This paper discusses how a next generation ton-scale dark matter detector could discover neutrino-nucleus coherent scattering, a precisely-predicted Standard Model process. A high intensity pion- and muon- decay-at-rest neutrino source recently proposed for oscillation physics at underground laboratories would provide the neutrinos for these measurements. In this paper, we calculate raw rates for various target materials commonly used in dark matter detectors and show that discovery of this interaction is possible with a 2 ton$\cdot$year GEODM exposure in an optimistic energy threshold and efficiency scenario. We also study the effects of the neutrino source on WIMP sensitivity and discuss the modulated neutrino signal as a sensitivity/consistency check between different dark matter experiments at DUSEL. Furthermore, we consider the possibility of coherent neutrino physics with a GEODM module placed within tens of meters of the neutrino source.
Sterile Neutrino Fits to Short Baseline Neutrino Oscillation Measurements
J. M. Conrad,C. M. Ignarra,G. Karagiorgi,M. H. Shaevitz,J. Spitz
Physics , 2012,
Abstract: This paper reviews short baseline oscillation experiments as interpreted within the context of one, two, and three sterile neutrino models associated with additional neutrino mass states in the ~1 eV range. Appearance and disappearance signals and limits are considered. We show that fitting short baseline data sets to a (3+3) model, defined by three active and three sterile neutrinos, results in an overall goodness of fit of 67%, and a compatibility of 90% among all data sets -- to be compared to the compatibility of 0.043% and 13% for a (3+1) and a (3+2) model, respectively. While the (3+3) fit yields the highest quality overall, it still finds inconsistencies with the MiniBooNE appearance data sets; in particular, the global fit fails to account for the observed MiniBooNE low-energy excess. Given the overall improvement, we recommend using the results of (3+2) and (3+3) fits, rather than (3+1) fits, for future neutrino oscillation phenomenology. These results motivate the pursuit of further short baseline experiments, such as those reviewed in this paper.
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