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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.08469">arXiv:2209.08469</a> <span> [<a href="https://arxiv.org/pdf/2209.08469">pdf</a>, <a href="https://arxiv.org/ps/2209.08469">ps</a>, <a href="https://arxiv.org/format/2209.08469">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chaotic Dynamics">nlin.CD</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> </div> <p class="title is-5 mathjax"> Fluctuating Non-linear Non-equilibrium System in Terms of Nambu Thermodynamics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Katagiri%2C+S">So Katagiri</a>, <a href="/search/physics?searchtype=author&query=Matsuoka%2C+Y">Yoshiki Matsuoka</a>, <a href="/search/physics?searchtype=author&query=Sugamoto%2C+A">Akio Sugamoto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2209.08469v9-abstract-short" style="display: inline;"> It is shown that the structure of non-equilibrium thermodynamic system far from equilibrium can be captured in terms of a generalized "Nambu dynamics", in the presence of fluctuation effects in non-equilibrium thermodynamics. Triangular reactions are examined in detail, and it is shown that Nambu brackets can be used to describe them even when they are far from equilibrium, such as with cycles. Ti… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.08469v9-abstract-full').style.display = 'inline'; document.getElementById('2209.08469v9-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.08469v9-abstract-full" style="display: none;"> It is shown that the structure of non-equilibrium thermodynamic system far from equilibrium can be captured in terms of a generalized "Nambu dynamics", in the presence of fluctuation effects in non-equilibrium thermodynamics. Triangular reactions are examined in detail, and it is shown that Nambu brackets can be used to describe them even when they are far from equilibrium, such as with cycles. Time evolution of the non-equilibrium state using the Hamiltonian and entropy is analyzed and it is shown that the entropy evolution is periodic with the negative contribution caused by the Hamiltonian suppressing the increase caused by entropy. As concrete examples, chemical reaction systems with time oscillation, such as the Belousov-Zhabotinsky reaction (BZ reaction), Hindmarsh-Rose(H-R) mode, are examined. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.08469v9-abstract-full').style.display = 'none'; document.getElementById('2209.08469v9-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">48 pages, 20 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> OUJ-FTC-8, OCHA-PP-373 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.04900">arXiv:2201.04900</a> <span> [<a href="https://arxiv.org/pdf/2201.04900">pdf</a>, <a href="https://arxiv.org/ps/2201.04900">ps</a>, <a href="https://arxiv.org/format/2201.04900">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mathematical Physics">math-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> </div> </div> <p class="title is-5 mathjax"> Analytical Study of Anomalous Diffusion by Randomly Modulated Dipole </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Katagiri%2C+S">S. Katagiri</a>, <a href="/search/physics?searchtype=author&query=Matsuo%2C+Y">Y. Matsuo</a>, <a href="/search/physics?searchtype=author&query=Matsuoka%2C+Y">Y. Matsuoka</a>, <a href="/search/physics?searchtype=author&query=Sugamoto%2C+A">A. Sugamoto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2201.04900v3-abstract-short" style="display: inline;"> This paper derives the Fokker-Planck (FP) equation for a particle moving in potential by a randomly modulated dipole. The FP equation describes the anomalous diffusion observed in the companion paper [1] and breaks the conservation of the total probability at the singularity by the dipole. It also shows anisotropic diffusion, which is typical in fluid turbulence. We need to modify the probability… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.04900v3-abstract-full').style.display = 'inline'; document.getElementById('2201.04900v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.04900v3-abstract-full" style="display: none;"> This paper derives the Fokker-Planck (FP) equation for a particle moving in potential by a randomly modulated dipole. The FP equation describes the anomalous diffusion observed in the companion paper [1] and breaks the conservation of the total probability at the singularity by the dipole. It also shows anisotropic diffusion, which is typical in fluid turbulence. We need to modify the probability density by introducing a mechanism to recover the particle. After the modification, the latent fractal dimension matches with the results of the companion paper. We hope that our model gives a new example of fractional diffusion, where the random singularity triggers fractionality. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.04900v3-abstract-full').style.display = 'none'; document.getElementById('2201.04900v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 April, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">35 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> OUJ-FTC-7 OCHA-PP-369 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.04897">arXiv:2201.04897</a> <span> [<a href="https://arxiv.org/pdf/2201.04897">pdf</a>, <a href="https://arxiv.org/ps/2201.04897">ps</a>, <a href="https://arxiv.org/format/2201.04897">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mathematical Physics">math-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.cnsns.2023.107342">10.1016/j.cnsns.2023.107342 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Anomalous diffusion in a randomly modulated velocity field </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Aibara%2C+N">Noriaki Aibara</a>, <a href="/search/physics?searchtype=author&query=Fujimoto%2C+N">Naoaki Fujimoto</a>, <a href="/search/physics?searchtype=author&query=Katagiri%2C+S">So Katagiri</a>, <a href="/search/physics?searchtype=author&query=Matsuo%2C+Y">Yutaka Matsuo</a>, <a href="/search/physics?searchtype=author&query=Matsuoka%2C+Y">Yoshiki Matsuoka</a>, <a href="/search/physics?searchtype=author&query=Sugamoto%2C+A">Akio Sugamoto</a>, <a href="/search/physics?searchtype=author&query=Yokoyama%2C+K">Ken Yokoyama</a>, <a href="/search/physics?searchtype=author&query=Yumibayashi%2C+T">Tsukasa Yumibayashi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2201.04897v5-abstract-short" style="display: inline;"> This paper proposes a simple model of anomalous diffusion, in which a particle moves with the velocity field induced by a single "dipole" (a doublet or a pair of source and sink), whose moment is modulated randomly at each time step. A motivation to introduce such a model is that it may serve as a toy model to investigate an anomalous diffusion of fluid particles in turbulence. We perform a numeri… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.04897v5-abstract-full').style.display = 'inline'; document.getElementById('2201.04897v5-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.04897v5-abstract-full" style="display: none;"> This paper proposes a simple model of anomalous diffusion, in which a particle moves with the velocity field induced by a single "dipole" (a doublet or a pair of source and sink), whose moment is modulated randomly at each time step. A motivation to introduce such a model is that it may serve as a toy model to investigate an anomalous diffusion of fluid particles in turbulence. We perform a numerical simulation of the fractal dimension of the trajectory using periodic boundary conditions in two and three dimensions. For a wide range of the dipole moment, we estimate the fractal dimension of the trajectory to be 1.5--1.9 (2D) and 1.6--2.7 (3D). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.04897v5-abstract-full').style.display = 'none'; document.getElementById('2201.04897v5-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 9 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> OUJ-FTC-6 OCHA-PP-367 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2109.08300">arXiv:2109.08300</a> <span> [<a href="https://arxiv.org/pdf/2109.08300">pdf</a>, <a href="https://arxiv.org/ps/2109.08300">ps</a>, <a href="https://arxiv.org/format/2109.08300">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Soft Condensed Matter">cond-mat.soft</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1017/jfm.2021.5">10.1017/jfm.2021.5 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Prediction of shear-thickening of particle suspensions in viscoelastic fluids by direct numerical simulation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Matsuoka%2C+Y">Yuki Matsuoka</a>, <a href="/search/physics?searchtype=author&query=Nakayama%2C+Y">Yasuya Nakayama</a>, <a href="/search/physics?searchtype=author&query=Kajiwara%2C+T">Toshihisa Kajiwara</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2109.08300v1-abstract-short" style="display: inline;"> To elucidate the key factor for the quantitative prediction of the shear-thickening in suspensions in viscoelastic fluids, direct numerical simulations of many-particle suspensions in a multi-mode Oldroyd-B fluid are performed using the smoothed profile method. Suspension flow under simple shear flow is solved under periodic boundary conditions by using Lees--Edwards boundary conditions for partic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.08300v1-abstract-full').style.display = 'inline'; document.getElementById('2109.08300v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2109.08300v1-abstract-full" style="display: none;"> To elucidate the key factor for the quantitative prediction of the shear-thickening in suspensions in viscoelastic fluids, direct numerical simulations of many-particle suspensions in a multi-mode Oldroyd-B fluid are performed using the smoothed profile method. Suspension flow under simple shear flow is solved under periodic boundary conditions by using Lees--Edwards boundary conditions for particle dynamics and a time-dependent oblique coordinate system that evolves with mean shear flow for fluid dynamics. Semi-dilute many-particle suspensions up to a particle volume fraction of 0.1 are investigated. The presented numerical results regarding the bulk rheological properties of the shear-thickening behavior agree quantitatively with recent experimental results of semi-dilute suspensions in a Boger fluid. The presented result clarifies that an accurate estimation of the first normal stress difference of the matrix in the shear-rate range where the shear-thickening starts to occur is crucial for the quantitative prediction of the suspension shear-thickening in a Boger fluid matrix at around the Weissenberg number $\rm{Wi}=1$ by an Oldroyd-B model. Additionally, the effect of suspension microstructures on the suspension viscosity is examined. The paper concludes with a discussion on how the flow pattern and the elastic stress development change with the volume fraction and Weissenberg number. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.08300v1-abstract-full').style.display = 'none'; document.getElementById('2109.08300v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of Fluid Mechanics, 913, A38 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2012.10404">arXiv:2012.10404</a> <span> [<a href="https://arxiv.org/pdf/2012.10404">pdf</a>, <a href="https://arxiv.org/ps/2012.10404">ps</a>, <a href="https://arxiv.org/format/2012.10404">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Soft Condensed Matter">cond-mat.soft</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1039/C9SM01736D">10.1039/C9SM01736D <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Effects of viscoelasticity on shear-thickening in dilute suspensions in a viscoelastic fluid </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Matsuoka%2C+Y">Yuki Matsuoka</a>, <a href="/search/physics?searchtype=author&query=Nakayama%2C+Y">Yasuya Nakayama</a>, <a href="/search/physics?searchtype=author&query=Kajiwara%2C+T">Toshihisa Kajiwara</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2012.10404v1-abstract-short" style="display: inline;"> We investigate previously unclarified effects of fluid elasticity on shear-thickening in dilute suspensions in an Oldroyd-B viscoelastic fluid using a novel direct numerical simulation based on the smoothed profile method. Fluid elasticity is determined by the Weissenberg number Wi and by viscosity ratio $1-尾=畏_p/(畏_s+畏_p)$ which measures the coupling between the polymer stress and flow: $畏_p$ and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.10404v1-abstract-full').style.display = 'inline'; document.getElementById('2012.10404v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2012.10404v1-abstract-full" style="display: none;"> We investigate previously unclarified effects of fluid elasticity on shear-thickening in dilute suspensions in an Oldroyd-B viscoelastic fluid using a novel direct numerical simulation based on the smoothed profile method. Fluid elasticity is determined by the Weissenberg number Wi and by viscosity ratio $1-尾=畏_p/(畏_s+畏_p)$ which measures the coupling between the polymer stress and flow: $畏_p$ and $畏_s$ are the polymer and solvent viscosity, respectively.As $1-尾$ increases, while the stresslet does not change significantly compared to that in the $尾\to 1$ limit, the growth rate of the normalized polymer stress with Wi was suppressed.Analysis of flow and conformation dynamics around a particle for different $尾$ reveals that at large $1-尾$, polymer stress modulates flow, leading to suppression of polymer stretch.This effect of $尾$ on polymer stress development indicates complex coupling between fluid elasticity and flow, and is essential to understand the rheology and hydrodynamic interactions in suspensions in viscoelastic media. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.10404v1-abstract-full').style.display = 'none'; document.getElementById('2012.10404v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Soft Matter 16.3 (2020): 728-737 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1809.02287">arXiv:1809.02287</a> <span> [<a href="https://arxiv.org/pdf/1809.02287">pdf</a>, <a href="https://arxiv.org/format/1809.02287">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2018.08.042">10.1016/j.nima.2018.08.042 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Performance test of the MAIKo active target </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Furuno%2C+T">T. Furuno</a>, <a href="/search/physics?searchtype=author&query=Kawabata%2C+T">T. Kawabata</a>, <a href="/search/physics?searchtype=author&query=Ong%2C+H+J">H. J. Ong</a>, <a href="/search/physics?searchtype=author&query=Adachi%2C+S">S. Adachi</a>, <a href="/search/physics?searchtype=author&query=Ayyad%2C+Y">Y. Ayyad</a>, <a href="/search/physics?searchtype=author&query=Baba%2C+T">T. Baba</a>, <a href="/search/physics?searchtype=author&query=Fujikawa%2C+Y">Y. Fujikawa</a>, <a href="/search/physics?searchtype=author&query=Hashimoto%2C+T">T. Hashimoto</a>, <a href="/search/physics?searchtype=author&query=Inaba%2C+K">K. Inaba</a>, <a href="/search/physics?searchtype=author&query=Ishii%2C+Y">Y. Ishii</a>, <a href="/search/physics?searchtype=author&query=Kabuki%2C+S">S. Kabuki</a>, <a href="/search/physics?searchtype=author&query=Kubo%2C+H">H. Kubo</a>, <a href="/search/physics?searchtype=author&query=Matsuda%2C+Y">Y. Matsuda</a>, <a href="/search/physics?searchtype=author&query=Matsuoka%2C+Y">Y. Matsuoka</a>, <a href="/search/physics?searchtype=author&query=Mizumoto%2C+T">T. Mizumoto</a>, <a href="/search/physics?searchtype=author&query=Morimoto%2C+T">T. Morimoto</a>, <a href="/search/physics?searchtype=author&query=Murata%2C+M">M. Murata</a>, <a href="/search/physics?searchtype=author&query=Sawano%2C+T">T. Sawano</a>, <a href="/search/physics?searchtype=author&query=Suzuki%2C+T">T. Suzuki</a>, <a href="/search/physics?searchtype=author&query=Takada%2C+A">A. Takada</a>, <a href="/search/physics?searchtype=author&query=Tanaka%2C+J">J. Tanaka</a>, <a href="/search/physics?searchtype=author&query=Tanihata%2C+I">I. Tanihata</a>, <a href="/search/physics?searchtype=author&query=Tanimori%2C+T">T. Tanimori</a>, <a href="/search/physics?searchtype=author&query=Tran%2C+D+T">D. T. Tran</a>, <a href="/search/physics?searchtype=author&query=Tsumura%2C+M">M. Tsumura</a> , et al. (1 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1809.02287v1-abstract-short" style="display: inline;"> A new active target named MAIKo (Mu-PIC based Active target for Inverse Kinematics$_{\circ}$) has been developed at Kyoto University and Research Center for Nuclear Physics (RCNP), Osaka University. MAIKo is suited for missing-mass spectroscopy of unstable nuclei at forward scattering angles in inverse kinematics. MAIKo consists of a time projection chamber (TPC), which incorporates a micro-pixel… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.02287v1-abstract-full').style.display = 'inline'; document.getElementById('1809.02287v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1809.02287v1-abstract-full" style="display: none;"> A new active target named MAIKo (Mu-PIC based Active target for Inverse Kinematics$_{\circ}$) has been developed at Kyoto University and Research Center for Nuclear Physics (RCNP), Osaka University. MAIKo is suited for missing-mass spectroscopy of unstable nuclei at forward scattering angles in inverse kinematics. MAIKo consists of a time projection chamber (TPC), which incorporates a micro-pixel chamber ($渭$-PIC) as the electron multiplication and collection system. In MAIKo, the medium gas also plays the role of a reaction target, thus allowing detection of low-energy recoil particles with high position resolution. The MAIKo TPC was commissioned with He(93%)+iso-C$_{4}$H$_{10}$(7%) and He(93%)+CO$_{2}$(7%) mixture gasses at 430 hPa. The gas gain and the angular resolution of MAIKo were evaluated with an alpha source and a $^{4}$He beam at 56 MeV. The TPC was stably operated up to 1000-kcps beam intensity. A tracking algorithm using the Hough transform method has been developed to analyze scattering events. An angular resolution of 1.3$^{\circ}$ was achieved for scattered $^{4}$He particles. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.02287v1-abstract-full').style.display = 'none'; document.getElementById('1809.02287v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 September, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 17 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Instruments and Methods in Physics Research Section A 908, 215-224 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1702.01484">arXiv:1702.01484</a> <span> [<a href="https://arxiv.org/pdf/1702.01484">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/srep41972">10.1038/srep41972 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First On-Site True Gamma-Ray Imaging-Spectroscopy of Contamination near Fukushima Plant </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Tomono%2C+D">Dai Tomono</a>, <a href="/search/physics?searchtype=author&query=Mizumoto%2C+T">Tetsuya Mizumoto</a>, <a href="/search/physics?searchtype=author&query=Takada%2C+A">Atsushi Takada</a>, <a href="/search/physics?searchtype=author&query=Komura%2C+S">Shotaro Komura</a>, <a href="/search/physics?searchtype=author&query=Matsuoka%2C+Y">Yoshihiro Matsuoka</a>, <a href="/search/physics?searchtype=author&query=Mizumura%2C+Y">Yoshitaka Mizumura</a>, <a href="/search/physics?searchtype=author&query=Oda%2C+M">Makoto Oda</a>, <a href="/search/physics?searchtype=author&query=Tanimori%2C+T">Toru Tanimori</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1702.01484v1-abstract-short" style="display: inline;"> We have developed an Electron Tracking Compton Camera (ETCC), which provides a well-defined Point Spread Function (PSF) by reconstructing a direction of each gamma as a point and realizes simultaneous measurement of brightness and spectrum of MeV gamma-rays for the first time. Here, we present the results of our on-site pilot gamma-imaging-spectroscopy with ETCC at three contaminated locations in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.01484v1-abstract-full').style.display = 'inline'; document.getElementById('1702.01484v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1702.01484v1-abstract-full" style="display: none;"> We have developed an Electron Tracking Compton Camera (ETCC), which provides a well-defined Point Spread Function (PSF) by reconstructing a direction of each gamma as a point and realizes simultaneous measurement of brightness and spectrum of MeV gamma-rays for the first time. Here, we present the results of our on-site pilot gamma-imaging-spectroscopy with ETCC at three contaminated locations in the vicinity of the Fukushima Daiichi Nuclear Power Plants in Japan in 2014. The obtained distribution of brightness (or emissivity) with remote-sensing observations is unambiguously converted into the dose distribution. We confirm that the dose distribution is consistent with the one taken by conventional mapping measurements with a dosimeter physically placed at each grid point. Furthermore, its imaging spectroscopy, boosted by Compton-edge-free spectra, reveals complex radioactive features in a quantitative manner around each individual target point in the background-dominated environment. Notably, we successfully identify a "micro hot spot" of residual caesium contamination even in an already decontaminated area. These results show that the ETCC performs exactly as the geometrical optics predicts, demonstrates its versatility in the field radiation measurement, and reveals potentials for application in many fields, including the nuclear industry, medical field, and astronomy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.01484v1-abstract-full').style.display = 'none'; document.getElementById('1702.01484v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 February, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 7 figures, 2 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Scientific Reports 7, 41972 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1702.01483">arXiv:1702.01483</a> <span> [<a href="https://arxiv.org/pdf/1702.01483">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/srep41511">10.1038/srep41511 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Establishment of Imaging Spectroscopy of Nuclear Gamma-Rays based on Geometrical Optics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Tanimori%2C+T">Toru Tanimori</a>, <a href="/search/physics?searchtype=author&query=Mizumura%2C+Y">Yoshitaka Mizumura</a>, <a href="/search/physics?searchtype=author&query=Takada%2C+A">Atsushi Takada</a>, <a href="/search/physics?searchtype=author&query=Miyamoto%2C+S">Shohei Miyamoto</a>, <a href="/search/physics?searchtype=author&query=Takemura%2C+T">Taito Takemura</a>, <a href="/search/physics?searchtype=author&query=Kishimoto%2C+T">Tetsuro Kishimoto</a>, <a href="/search/physics?searchtype=author&query=Komura%2C+S">Shotaro Komura</a>, <a href="/search/physics?searchtype=author&query=Kubo%2C+H">Hidetoshi Kubo</a>, <a href="/search/physics?searchtype=author&query=Kurosawa%2C+S">Shunsuke Kurosawa</a>, <a href="/search/physics?searchtype=author&query=Matsuoka%2C+Y">Yoshihiro Matsuoka</a>, <a href="/search/physics?searchtype=author&query=Miuchi%2C+K">Kentaro Miuchi</a>, <a href="/search/physics?searchtype=author&query=Mizumoto%2C+T">Tetsuya Mizumoto</a>, <a href="/search/physics?searchtype=author&query=Nakamasu%2C+Y">Yuma Nakamasu</a>, <a href="/search/physics?searchtype=author&query=Nakamura%2C+K">Kiseki Nakamura</a>, <a href="/search/physics?searchtype=author&query=Parker%2C+J+D">Joseph D. Parker</a>, <a href="/search/physics?searchtype=author&query=Sawano%2C+T">Tatsuya Sawano</a>, <a href="/search/physics?searchtype=author&query=Sonoda%2C+S">Shinya Sonoda</a>, <a href="/search/physics?searchtype=author&query=Tomono%2C+D">Dai Tomono</a>, <a href="/search/physics?searchtype=author&query=Yoshikawa%2C+K">Kei Yoshikawa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1702.01483v1-abstract-short" style="display: inline;"> Since the discovery of nuclear gamma-rays, its imaging has been limited to pseudo imaging, such as Compton Camera (CC) and coded mask. Pseudo imaging does not keep physical information (intensity, or brightness in Optics) along a ray, and thus is capable of no more than qualitative imaging of bright objects. To attain quantitative imaging, cameras that realize geometrical optics is essential, whic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.01483v1-abstract-full').style.display = 'inline'; document.getElementById('1702.01483v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1702.01483v1-abstract-full" style="display: none;"> Since the discovery of nuclear gamma-rays, its imaging has been limited to pseudo imaging, such as Compton Camera (CC) and coded mask. Pseudo imaging does not keep physical information (intensity, or brightness in Optics) along a ray, and thus is capable of no more than qualitative imaging of bright objects. To attain quantitative imaging, cameras that realize geometrical optics is essential, which would be, for nuclear MeV gammas, only possible via complete reconstruction of the Compton process. Recently we have revealed that "Electron Tracking Compton Camera" (ETCC) provides a well-defined Point Spread Function (PSF). The information of an incoming gamma is kept along a ray with the PSF and that is equivalent to geometrical optics. Here we present an imaging-spectroscopic measurement with the ETCC. Our results highlight the intrinsic difficulty with CCs in performing accurate imaging, and show that the ETCC surmounts this problem. The imaging capability also helps the ETCC suppress the noise level dramatically by ~3 orders of magnitude without a shielding structure. Furthermore, full reconstruction of Compton process with the ETCC provides spectra free of Compton edges. These results mark the first proper imaging of nuclear gammas based on the genuine geometrical optics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.01483v1-abstract-full').style.display = 'none'; document.getElementById('1702.01483v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 February, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">22 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Scientific Reports 7, 41511 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1508.01287">arXiv:1508.01287</a> <span> [<a href="https://arxiv.org/pdf/1508.01287">pdf</a>, <a href="https://arxiv.org/ps/1508.01287">ps</a>, <a href="https://arxiv.org/format/1508.01287">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/10/06/C06003">10.1088/1748-0221/10/06/C06003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A performance study of an electron-tracking Compton camera with a compact system for environmental gamma-ray observation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mizumoto%2C+T">Tetsuya Mizumoto</a>, <a href="/search/physics?searchtype=author&query=Tomono%2C+D">Dai Tomono</a>, <a href="/search/physics?searchtype=author&query=Takada%2C+A">Atsushi Takada</a>, <a href="/search/physics?searchtype=author&query=Tanimori%2C+T">Toru Tanimori</a>, <a href="/search/physics?searchtype=author&query=Komura%2C+S">Shotaro Komura</a>, <a href="/search/physics?searchtype=author&query=Kubo%2C+H">Hidetoshi Kubo</a>, <a href="/search/physics?searchtype=author&query=Matsuoka%2C+Y">Yoshihiro Matsuoka</a>, <a href="/search/physics?searchtype=author&query=Mizumura%2C+Y">Yoshitaka Mizumura</a>, <a href="/search/physics?searchtype=author&query=Nakamura%2C+K">Kiseki Nakamura</a>, <a href="/search/physics?searchtype=author&query=Nakamura%2C+S">Shogo Nakamura</a>, <a href="/search/physics?searchtype=author&query=Oda%2C+M">Makoto Oda</a>, <a href="/search/physics?searchtype=author&query=Parker%2C+J+D">Joseph D. Parker</a>, <a href="/search/physics?searchtype=author&query=Sawano%2C+T">Tatsuya Sawano</a>, <a href="/search/physics?searchtype=author&query=Bando%2C+N">Naoto Bando</a>, <a href="/search/physics?searchtype=author&query=Nabetani%2C+A">Akira Nabetani</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1508.01287v1-abstract-short" style="display: inline;"> An electron-tracking Compton camera (ETCC) is a detector that can determine the arrival direction and energy of incident sub-MeV/MeV gamma-ray events on an event-by-event basis. It is a hybrid detector consisting of a gaseous time projection chamber (TPC), that is the Compton-scattering target and the tracker of recoil electrons, and a position-sensitive scintillation camera that absorbs of the sc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.01287v1-abstract-full').style.display = 'inline'; document.getElementById('1508.01287v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1508.01287v1-abstract-full" style="display: none;"> An electron-tracking Compton camera (ETCC) is a detector that can determine the arrival direction and energy of incident sub-MeV/MeV gamma-ray events on an event-by-event basis. It is a hybrid detector consisting of a gaseous time projection chamber (TPC), that is the Compton-scattering target and the tracker of recoil electrons, and a position-sensitive scintillation camera that absorbs of the scattered gamma rays, to measure gamma rays in the environment from contaminated soil. To measure of environmental gamma rays from soil contaminated with radioactive cesium (Cs), we developed a portable battery-powered ETCC system with a compact readout circuit and data-acquisition system for the SMILE-II experiment. We checked the gamma-ray imaging ability and ETCC performance in the laboratory by using several gamma-ray point sources. The performance test indicates that the field of view (FoV) of the detector is about 1$\;$sr and that the detection efficiency and angular resolution for 662$\;$keV gamma rays from the center of the FoV is $(9.31 \pm 0.95) \times 10^{^-5}$ and $5.9^{\circ} \pm 0.6^{\circ}$, respectively. Furthermore, the ETCC can detect 0.15$\;渭\rm{Sv/h}$ from a $^{137}$Cs gamma-ray source with a significance of 5$蟽$ in 13 min in the laboratory. In this paper, we report the specifications of the ETCC and the results of the performance tests. Furthermore, we discuss its potential use for environmental gamma-ray measurements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1508.01287v1-abstract-full').style.display = 'none'; document.getElementById('1508.01287v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 August, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 7 figures, proceeding of the 10th International Conference on Position Sensitive Detectors (PSD10)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JINST 10 (2015) C06003 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1412.3918">arXiv:1412.3918</a> <span> [<a href="https://arxiv.org/pdf/1412.3918">pdf</a>, <a href="https://arxiv.org/ps/1412.3918">ps</a>, <a href="https://arxiv.org/format/1412.3918">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/10/01/C01053">10.1088/1748-0221/10/01/C01053 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Performance of a new electron-tracking Compton camera under intense radiations from a water target irradiated with a proton beam </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Matsuoka%2C+Y">Yoshihiro Matsuoka</a>, <a href="/search/physics?searchtype=author&query=Tanimori%2C+T">T. Tanimori</a>, <a href="/search/physics?searchtype=author&query=Kubo%2C+H">H. Kubo</a>, <a href="/search/physics?searchtype=author&query=Takada%2C+A">A. Takada</a>, <a href="/search/physics?searchtype=author&query=Parker%2C+J+D">J. D. Parker</a>, <a href="/search/physics?searchtype=author&query=Mizumoto%2C+T">T. Mizumoto</a>, <a href="/search/physics?searchtype=author&query=Mizumura%2C+Y">Y. Mizumura</a>, <a href="/search/physics?searchtype=author&query=Iwaki%2C+S">S. Iwaki</a>, <a href="/search/physics?searchtype=author&query=Sawano%2C+T">T. Sawano</a>, <a href="/search/physics?searchtype=author&query=Komura%2C+S">S. Komura</a>, <a href="/search/physics?searchtype=author&query=Kishimoto%2C+T">T. Kishimoto</a>, <a href="/search/physics?searchtype=author&query=Oda%2C+M">M. Oda</a>, <a href="/search/physics?searchtype=author&query=Takemura%2C+T">T. Takemura</a>, <a href="/search/physics?searchtype=author&query=Miyamoto%2C+S">S. Miyamoto</a>, <a href="/search/physics?searchtype=author&query=Sonoda%2C+S">S. Sonoda</a>, <a href="/search/physics?searchtype=author&query=Tomono%2C+D">D. Tomono</a>, <a href="/search/physics?searchtype=author&query=Miuchi%2C+K">K. Miuchi</a>, <a href="/search/physics?searchtype=author&query=Kabuki%2C+S">S. Kabuki</a>, <a href="/search/physics?searchtype=author&query=Kurosawa%2C+S">S. Kurosawa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1412.3918v2-abstract-short" style="display: inline;"> We have developed an electron-tracking Compton camera (ETCC) for use in next-generation MeV gamma ray telescopes. An ETCC consists of a gaseous time projection chamber (TPC) and pixel scintillator arrays (PSAs). Since the TPC measures the three dimensional tracks of Compton-recoil electrons, the ETCC can completely reconstruct the incident gamma rays. Moreover, the ETCC demonstrates efficient back… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1412.3918v2-abstract-full').style.display = 'inline'; document.getElementById('1412.3918v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1412.3918v2-abstract-full" style="display: none;"> We have developed an electron-tracking Compton camera (ETCC) for use in next-generation MeV gamma ray telescopes. An ETCC consists of a gaseous time projection chamber (TPC) and pixel scintillator arrays (PSAs). Since the TPC measures the three dimensional tracks of Compton-recoil electrons, the ETCC can completely reconstruct the incident gamma rays. Moreover, the ETCC demonstrates efficient background rejection power in Compton-kinematics tests, identifies particle from the energy deposit rate (dE/dX) registered in the TPC, and provides high quality imaging by completely reconstructing the Compton scattering process. We are planning the "Sub-MeV gamma ray Imaging Loaded-on-balloon Experiment" (SMILE) for our proposed all-sky survey satellite. Performance tests of a mid-sized 30 cm-cubic ETCC, constructed for observing the Crab nebula, are ongoing. However, observations at balloon altitudes or satellite orbits are obstructed by radiation background from the atmosphere and the detector itself. The background rejection power was checked using proton accelerator experiments conducted at the Research Center for Nuclear Physics, Osaka University. To create the intense radiation fields encountered in space, which comprise gamma rays, neutrons, protons, and other energetic entities, we irradiated a water target with a 140 MeV proton beam and placed a SMILE-II ETCC near the target. In this situation, the counting rate was five times than that expected at the balloon altitude. Nonetheless, the ETCC stably operated and identified particles sufficiently to obtain a clear gamma ray image of the checking source. Here, we report the performance of our detector and demonstrate its effective background rejection based in electron tracking experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1412.3918v2-abstract-full').style.display = 'none'; document.getElementById('1412.3918v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 December, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 8figures, http://www-cr.scphys.kyoto-u.ac.jp/research/MeV-gamma/wiki/wiki.cgi , PSD10</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1312.0438">arXiv:1312.0438</a> <span> [<a href="https://arxiv.org/pdf/1312.0438">pdf</a>, <a href="https://arxiv.org/format/1312.0438">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/9/05/C05045">10.1088/1748-0221/9/05/C05045 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Development of a 30 cm-cube Electron-Tracking Compton Camera for the SMILE-II Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mizumura%2C+Y">Y. Mizumura</a>, <a href="/search/physics?searchtype=author&query=Tanimori%2C+T">T. Tanimori</a>, <a href="/search/physics?searchtype=author&query=Kubo%2C+H">H. Kubo</a>, <a href="/search/physics?searchtype=author&query=Takada%2C+A">A. Takada</a>, <a href="/search/physics?searchtype=author&query=Parker%2C+J+D">J. D. Parker</a>, <a href="/search/physics?searchtype=author&query=Mizumoto%2C+T">T. Mizumoto</a>, <a href="/search/physics?searchtype=author&query=Sonoda%2C+S">S. Sonoda</a>, <a href="/search/physics?searchtype=author&query=Tomono%2C+D">D. Tomono</a>, <a href="/search/physics?searchtype=author&query=Sawano%2C+T">T. Sawano</a>, <a href="/search/physics?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/physics?searchtype=author&query=Matsuoka%2C+Y">Y. Matsuoka</a>, <a href="/search/physics?searchtype=author&query=Komura%2C+S">S. Komura</a>, <a href="/search/physics?searchtype=author&query=Nakamura%2C+S">S. Nakamura</a>, <a href="/search/physics?searchtype=author&query=Oda%2C+M">M. Oda</a>, <a href="/search/physics?searchtype=author&query=Miuchi%2C+K">K. Miuchi</a>, <a href="/search/physics?searchtype=author&query=Kabuki%2C+S">S. Kabuki</a>, <a href="/search/physics?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/physics?searchtype=author&query=Kurosawa%2C+S">S. Kurosawa</a>, <a href="/search/physics?searchtype=author&query=Iwaki%2C+S">S. Iwaki</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1312.0438v2-abstract-short" style="display: inline;"> To explore the sub-MeV/MeV gamma-ray window for astronomy, we have developed the Electron-Tracking Compton Camera (ETCC), and carried out the first performance test at room condition using several gamma-ray sources in the sub-MeV energy band. Using a simple track analysis for a quick first test of the performance, the gamma-ray imaging capability was demonstrated by clear images and 5.3 degrees of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.0438v2-abstract-full').style.display = 'inline'; document.getElementById('1312.0438v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1312.0438v2-abstract-full" style="display: none;"> To explore the sub-MeV/MeV gamma-ray window for astronomy, we have developed the Electron-Tracking Compton Camera (ETCC), and carried out the first performance test at room condition using several gamma-ray sources in the sub-MeV energy band. Using a simple track analysis for a quick first test of the performance, the gamma-ray imaging capability was demonstrated by clear images and 5.3 degrees of angular resolution measure (ARM) measured at 662 keV. As the greatest impact of this work, a gamma-ray detection efficiency on the order of $10^{-4}$ was achieved at the sub-MeV gamma-ray band, which is one order of magnitude higher than our previous experiment. This angular resolution and detection efficiency enables us to detect the Crab Nebula at the 5 sigma level with several hours observation at balloon altitude in middle latitude. Furthermore, good consistency of efficiencies between this performance test and simulation including only physical processes has a large importance; it means we achieve nearly 100% detection of Compton recoil electrons. Thus, our estimation of enhancements by upgrades of the detector is more dependable. We are planning to confirm the imaging capability of the ETCC by observation of celestial objects in the SMILE-II (Sub-MeV gamma ray Imaging Loaded-on-balloon Experiment II). The SMILE-II and following SMILE-III project will be an important key of sub-MeV/MeV gamma-ray astronomy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.0438v2-abstract-full').style.display = 'none'; document.getElementById('1312.0438v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 February, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 December, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 7 figures, Proceedings of the 15th International Workshop on Radiation Imaging Detectors (iWoRiD 2013)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JINST, 9, C05045, (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1305.4701">arXiv:1305.4701</a> <span> [<a href="https://arxiv.org/pdf/1305.4701">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Development of a Time-resolved Neutron Imaging Detector Based on the 渭PIC Micro-Pixel Chamber </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Parker%2C+J+D">Joseph D Parker</a>, <a href="/search/physics?searchtype=author&query=Harada%2C+M">Masahide Harada</a>, <a href="/search/physics?searchtype=author&query=Hattori%2C+K">Kaori Hattori</a>, <a href="/search/physics?searchtype=author&query=Iwaki%2C+S">Satoru Iwaki</a>, <a href="/search/physics?searchtype=author&query=Kabuki%2C+S">Shigeto Kabuki</a>, <a href="/search/physics?searchtype=author&query=Kishimoto%2C+Y">Yuji Kishimoto</a>, <a href="/search/physics?searchtype=author&query=Kubo%2C+H">Hidetoshi Kubo</a>, <a href="/search/physics?searchtype=author&query=Kurosawa%2C+S">Shunsuke Kurosawa</a>, <a href="/search/physics?searchtype=author&query=Matsuoka%2C+Y">Yoshihiro Matsuoka</a>, <a href="/search/physics?searchtype=author&query=Miuchi%2C+K">Kentaro Miuchi</a>, <a href="/search/physics?searchtype=author&query=Mizumoto%2C+T">Tetsuya Mizumoto</a>, <a href="/search/physics?searchtype=author&query=Nishimura%2C+H">Hironobu Nishimura</a>, <a href="/search/physics?searchtype=author&query=Oku%2C+T">Takayuki Oku</a>, <a href="/search/physics?searchtype=author&query=Sawano%2C+T">Tatsuya Sawano</a>, <a href="/search/physics?searchtype=author&query=Shinohara%2C+T">Takenao Shinohara</a>, <a href="/search/physics?searchtype=author&query=Suzuki%2C+J">Jun-ichi Suzuki</a>, <a href="/search/physics?searchtype=author&query=Takada%2C+A">Atsushi Takada</a>, <a href="/search/physics?searchtype=author&query=Tanimori%2C+T">Toru Tanimori</a>, <a href="/search/physics?searchtype=author&query=Ueno%2C+K">Kazuki Ueno</a>, <a href="/search/physics?searchtype=author&query=Ikeno%2C+M">Masahiro Ikeno</a>, <a href="/search/physics?searchtype=author&query=Tanaka%2C+M">Manobu Tanaka</a>, <a href="/search/physics?searchtype=author&query=Uchida%2C+T">Tomohisa Uchida</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1305.4701v1-abstract-short" style="display: inline;"> We have developed a prototype time-resolved neutron imaging detector employing a micro-pattern gaseous detector known as the micro-pixel chamber (渭PIC) coupled with a field-programmable-gate-array-based data acquisition system. Our detector system combines 100渭m-level spatial and sub-渭s time resolutions with a low gamma sensitivity of less than 10^-12 and high data rates, making it well suited for… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1305.4701v1-abstract-full').style.display = 'inline'; document.getElementById('1305.4701v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1305.4701v1-abstract-full" style="display: none;"> We have developed a prototype time-resolved neutron imaging detector employing a micro-pattern gaseous detector known as the micro-pixel chamber (渭PIC) coupled with a field-programmable-gate-array-based data acquisition system. Our detector system combines 100渭m-level spatial and sub-渭s time resolutions with a low gamma sensitivity of less than 10^-12 and high data rates, making it well suited for applications in neutron radiography at high-intensity, pulsed neutron sources. In the present paper, we introduce the detector system and present several test measurements performed at NOBORU (BL10), J-PARC to demonstrate the capabilities of our prototype. We also discuss future improvements to the spatial resolution and rate performance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1305.4701v1-abstract-full').style.display = 'none'; document.getElementById('1305.4701v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 May, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 7 figures, submitted to Hamon - Journal of the Japan Society for Neutron Science</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1305.3687">arXiv:1305.3687</a> <span> [<a href="https://arxiv.org/pdf/1305.3687">pdf</a>, <a href="https://arxiv.org/ps/1305.3687">ps</a>, <a href="https://arxiv.org/format/1305.3687">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2013.06.001">10.1016/j.nima.2013.06.001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spatial resolution of a 渭PIC-based neutron imaging detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Parker%2C+J+D">Joseph D. Parker</a>, <a href="/search/physics?searchtype=author&query=Harada%2C+M">Masahide Harada</a>, <a href="/search/physics?searchtype=author&query=Hattori%2C+K">Kaori Hattori</a>, <a href="/search/physics?searchtype=author&query=Iwaki%2C+S">Satoru Iwaki</a>, <a href="/search/physics?searchtype=author&query=Kabuki%2C+S">Shigeto Kabuki</a>, <a href="/search/physics?searchtype=author&query=Kishimoto%2C+Y">Yuji Kishimoto</a>, <a href="/search/physics?searchtype=author&query=Kubo%2C+H">Hidetoshi Kubo</a>, <a href="/search/physics?searchtype=author&query=Kurosawa%2C+S">Shunsuke Kurosawa</a>, <a href="/search/physics?searchtype=author&query=Matsuoka%2C+Y">Yoshihiro Matsuoka</a>, <a href="/search/physics?searchtype=author&query=Miuchi%2C+K">Kentaro Miuchi</a>, <a href="/search/physics?searchtype=author&query=Mizumoto%2C+T">Tetsuya Mizumoto</a>, <a href="/search/physics?searchtype=author&query=Nishimura%2C+H">Hironobu Nishimura</a>, <a href="/search/physics?searchtype=author&query=Oku%2C+T">Takayuki Oku</a>, <a href="/search/physics?searchtype=author&query=Sawano%2C+T">Tatsuya Sawano</a>, <a href="/search/physics?searchtype=author&query=Shinohara%2C+T">Takenao Shinohara</a>, <a href="/search/physics?searchtype=author&query=Suzuki%2C+J">Jun-ichi Suzuki</a>, <a href="/search/physics?searchtype=author&query=Takada%2C+A">Atsushi Takada</a>, <a href="/search/physics?searchtype=author&query=Tanimori%2C+T">Toru Tanimori</a>, <a href="/search/physics?searchtype=author&query=Ueno%2C+K">Kazuki Ueno</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1305.3687v1-abstract-short" style="display: inline;"> We present a detailed study of the spatial resolution of our time-resolved neutron imaging detector utilizing a new neutron position reconstruction method that improves both spatial resolution and event reconstruction efficiency. Our prototype detector system, employing a micro-pattern gaseous detector known as the micro-pixel chamber (渭PIC) coupled with a field-programmable-gate-array-based data… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1305.3687v1-abstract-full').style.display = 'inline'; document.getElementById('1305.3687v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1305.3687v1-abstract-full" style="display: none;"> We present a detailed study of the spatial resolution of our time-resolved neutron imaging detector utilizing a new neutron position reconstruction method that improves both spatial resolution and event reconstruction efficiency. Our prototype detector system, employing a micro-pattern gaseous detector known as the micro-pixel chamber (渭PIC) coupled with a field-programmable-gate-array-based data acquisition system, combines 100渭m-level spatial and sub-渭s time resolutions with excellent gamma rejection and high data rates, making it well suited for applications in neutron radiography at high-intensity, pulsed neutron sources. From data taken at the Materials and Life Science Experimental Facility within the Japan Proton Accelerator Research Complex (J-PARC), the spatial resolution was found to be approximately Gaussian with a sigma of 103.48 +/- 0.77 渭m (after correcting for beam divergence). This is a significant improvement over that achievable with our previous reconstruction method (334 +/- 13 渭m), and compares well with conventional neutron imaging detectors and with other high-rate detectors currently under development. Further, a detector simulation indicates that a spatial resolution of less than 60 渭m may be possible with optimization of the gas characteristics and 渭PIC structure. We also present an example of imaging combined with neutron resonance absorption spectroscopy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1305.3687v1-abstract-full').style.display = 'none'; document.getElementById('1305.3687v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 May, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 8 figures, submitted to Nuclear Instruments and Methods in Physics Research A</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> 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