Author
Joseph D. Parker
Bio: Joseph D. Parker is an academic researcher from Kyoto University. The author has contributed to research in topics: Neutron imaging & Neutron. The author has an hindex of 19, co-authored 79 publications receiving 1256 citations.
Topics: Neutron imaging, Neutron, Gamma ray, Compton scattering, Neutron source
Papers
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Boston University1, University of Waterloo2, Perimeter Institute for Theoretical Physics3, Massachusetts Institute of Technology4, Joseph Fourier University5, University of California, Los Angeles6, Occidental College7, University of Pennsylvania8, University of Zaragoza9, University of Sheffield10, Brandeis University11, Harvard University12, Nagasaki Institute of Applied Science13, University of Edinburgh14, University of New Mexico15, University of Huelva16, University of Utah17, University of Nottingham18, Kyoto University19, Lawrence Berkeley National Laboratory20, Temple University21, University of Warwick22, New York University23, Nagoya University24, University of Tokyo25, Saga University26, University of Ioannina27
TL;DR: The case for a dark matter detector with directional sensitivity was presented at the 2009 CYGNUS workshop on directional dark matter detection, and contributions from theorists and experimental groups in the field as mentioned in this paper.
Abstract: We present the case for a dark matter detector with directional sensitivity. This document was developed at the 2009 CYGNUS workshop on directional dark matter detection, and contains contributions from theorists and experimental groups in the field. We describe the need for a dark matter detector with directional sensitivity; each directional dark matter experiment presents their project's status; and we close with a feasibility study for scaling up to a one ton directional detector, which would cost around $150M.
224 citations
Wellesley College1, University of Zaragoza2, Istituto Nazionale di Fisica Nucleare3, Nagoya University4, University of Grenoble5, University of Lyon6, California Institute of Technology7, Massachusetts Institute of Technology8, Université Paris-Saclay9, University of Chicago10, Royal Holloway, University of London11, Saga University12, Lawrence Berkeley National Laboratory13, Middle East Technical University14, Colorado State University15, Kobe University16, University of Hawaii17, University of Florida18, Kyoto University19, Chiba University20, University of New Mexico21, University of Colorado Boulder22, KEK23, Paris Diderot University24, University of Tokyo25, Occidental College26, University of Sheffield27
TL;DR: In this paper, the authors review the various detector readout technologies used by directional detectors, summarize the challenges, advantages and drawbacks of each approach, and discuss future prospects for these technologies.
100 citations
TL;DR: In this article, a direction-sensitive dark matter search experiment at Kamioka underground laboratory with the NEWAGE-0.3a detector was performed, which achieved a new record of 5400 pb for 150 GeV / c 2 WIMPs.
98 citations
Kyoto University1, Tohoku University2, Osaka University3, Pusan National University4, Seoul National University5, Ling Tung University6, Academia Sinica7, National Sun Yat-sen University8, Nagoya University9, Osaka Electro-Communication University10, Ohio University11, Wakayama Medical University12, National Defense Academy of Japan13, National Chung Cheng University14, Tokyo Institute of Technology15
TL;DR: In this article, the first measurement of the λ(1405) photoproduction cross section was made, and the line shapes of λ (1405)-generated lines were measured in two photon energy ranges: near the production threshold (1.5 to 2.0 GeV) and far from it (2.0
Abstract: Differential cross sections for {gamma}p{yields}K{sup +}{lambda}(1405) and {gamma}p{yields}K{sup +}{sigma}{sup 0}(1385) reactions have been measured in the photon energy range from 1.5 to 2.4 GeV and the angular range of 0.8
74 citations
Osaka University1, Kyoto University2, Pusan National University3, Konan University4, Academia Sinica5, Wakayama Medical University6, Japan Atomic Energy Agency7, Nagoya University8, Ohio University9, Tohoku University10, Yamagata University11, Chiba University12, University of Miyazaki13, National Defense Academy of Japan14, Tokyo Institute of Technology15, University of Saskatchewan16, University of Minnesota17, Joint Institute for Nuclear Research18, Gifu University19, National Chung Cheng University20, University of Connecticut21, Michigan State University22
TL;DR: In this article, a search for the K − p p bound state (the lightest kaonic nucleus) was performed using the γ d → K + π − X reaction at E γ = 1.5 − 2.4 GeV at LEPS/SPring-8.
74 citations
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Journal Article•
TL;DR: In this article, a self-scanned 1024 element photodiode array and a minicomputer are used to measure the phase (wavefront) in the interference pattern of an interferometer to lambda/100.
Abstract: A self-scanned 1024 element photodiode array and minicomputer are used to measure the phase (wavefront) in the interference pattern of an interferometer to lambda/100. The photodiode array samples intensities over a 32 x 32 matrix in the interference pattern as the length of the reference arm is varied piezoelectrically. Using these data the minicomputer synchronously detects the phase at each of the 1024 points by a Fourier series method and displays the wavefront in contour and perspective plot on a storage oscilloscope in less than 1 min (Bruning et al. Paper WE16, OSA Annual Meeting, Oct. 1972). The array of intensities is sampled and averaged many times in a random fashion so that the effects of air turbulence, vibrations, and thermal drifts are minimized. Very significant is the fact that wavefront errors in the interferometer are easily determined and may be automatically subtracted from current or subsequent wavefrots. Various programs supporting the measurement system include software for determining the aperture boundary, sum and difference of wavefronts, removal or insertion of tilt and focus errors, and routines for spatial manipulation of wavefronts. FFT programs transform wavefront data into point spread function and modulus and phase of the optical transfer function of lenses. Display programs plot these functions in contour and perspective. The system has been designed to optimize the collection of data to give higher than usual accuracy in measuring the individual elements and final performance of assembled diffraction limited optical systems, and furthermore, the short loop time of a few minutes makes the system an attractive alternative to constraints imposed by test glasses in the optical shop.
1,300 citations
01 Jan 1998
561 citations
01 Jan 2003
TL;DR: In this paper, the thermal and epithermal self-shielding factors in different materials (Al, Au, Cd, Co, Cu, Eu, Gd, In, Ir, Mo, Ni, Pt, Pb, Rh, Sc, Sm and Ta) and different geometries (foils, wires, spheres and) have been calculated using the MCNP code.
Abstract: The presence of a sample in the neutron field of a nuclear reactor creates a perturbation of the local neutron fluxes. In general, the interpretation of the sample activation due to thermal and epithermal neutrons requires the knowledge of two corrective parameters: the thermal neutron self-shielding factor, Gth, and the resonance neutron self-shielding factor, Gres. Thermal neutron self-shielding factors in different materials (Al, Au, Cd, Co, Cu, Eu, Gd, In, Ir, Mo, Ni, Pt, Pb, Rh, Sc, Sm and Ta) and different geometries (foils, wires, spheres and) have been calculated by using the MCNP code.
473 citations
TL;DR: In this paper, the status of direct dark matter searches is summarized, focusing on the detector technologies used to directly detect a dark matter particle producing recoil energies in the keV energy scale.
Abstract: In recent decades, several detector technologies have been developed with the quest to directly detect dark matter interactions and to test one of the most important unsolved questions in modern physics. The sensitivity of these experiments has improved with a tremendous speed due to a constant development of the detectors and analysis methods, proving uniquely suited devices to solve the dark matter puzzle, as all other discovery strategies can only indirectly infer its existence. Despite the overwhelming evidence for dark matter from cosmological indications at small and large scales, clear evidence for a particle explaining these observations remains absent. This review summarises the status of direct dark matter searches, focusing on the detector technologies used to directly detect a dark matter particle producing recoil energies in the keV energy scale. The phenomenological signal expectations, main background sources, statistical treatment of data and calibration strategies are discussed.
395 citations