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class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.15412">arXiv:2112.15412</a> <span> [<a href="https://arxiv.org/pdf/2112.15412">pdf</a>, <a href="https://arxiv.org/format/2112.15412">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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/10.1103/PhysRevLett.128.132501">10.1103/PhysRevLett.128.132501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First Determination of the 27Al Neutron Distribution Radius from a Parity-Violating Electron Scattering Measurement </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=QWeak+Collaboration"> QWeak Collaboration</a>, <a href="/search/?searchtype=author&query=Androic%2C+D">D. Androic</a>, <a href="/search/?searchtype=author&query=Armstrong%2C+D+S">D. S. Armstrong</a>, <a href="/search/?searchtype=author&query=Bartlett%2C+K">K. Bartlett</a>, <a href="/search/?searchtype=author&query=Beminiwattha%2C+R+S">R. S. Beminiwattha</a>, <a href="/search/?searchtype=author&query=Benesch%2C+J">J. Benesch</a>, <a href="/search/?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/?searchtype=author&query=Birchall%2C+J">J. Birchall</a>, <a href="/search/?searchtype=author&query=Carlini%2C+R+D">R. D. Carlini</a>, <a href="/search/?searchtype=author&query=Cornejo%2C+J+C">J. C. Cornejo</a>, <a href="/search/?searchtype=author&query=Dusa%2C+S+C">S. Covrig Dusa</a>, <a href="/search/?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/?searchtype=author&query=Davis%2C+C+A">C. A. Davis</a>, <a href="/search/?searchtype=author&query=Deconinck%2C+W">W. Deconinck</a>, <a href="/search/?searchtype=author&query=Dowd%2C+J+F">J. F. Dowd</a>, <a href="/search/?searchtype=author&query=Dunne%2C+J+A">J. A. Dunne</a>, <a href="/search/?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/?searchtype=author&query=Duvall%2C+W+S">W. S. Duvall</a>, <a href="/search/?searchtype=author&query=Elaasar%2C+M">M. Elaasar</a>, <a href="/search/?searchtype=author&query=Falk%2C+W+R">W. R. Falk</a>, <a href="/search/?searchtype=author&query=Finn%2C+J+M">J. M. Finn</a>, <a href="/search/?searchtype=author&query=Forest%2C+T">T. Forest</a>, <a href="/search/?searchtype=author&query=Gal%2C+C">C. Gal</a>, <a href="/search/?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/?searchtype=author&query=Gericke%2C+M+T+W">M. T. W. Gericke</a> , et al. (69 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="2112.15412v2-abstract-short" style="display: inline;"> We report the first measurement of the parity-violating elastic electron scattering asymmetry on 27Al. The 27Al elastic asymmetry is A_PV = 2.16 +- 0.11 (stat) +- 0.16 (syst) ppm, and was measured at <Q^2> =0.02357 +- 0.0001 GeV^2, <theta_lab> = 7.61 +- 0.02 degrees, and <E_lab> = 1.157 GeV with the Qweak apparatus at Jefferson Lab. Predictions using a simple Born approximation as well as more sop… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.15412v2-abstract-full').style.display = 'inline'; document.getElementById('2112.15412v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.15412v2-abstract-full" style="display: none;"> We report the first measurement of the parity-violating elastic electron scattering asymmetry on 27Al. The 27Al elastic asymmetry is A_PV = 2.16 +- 0.11 (stat) +- 0.16 (syst) ppm, and was measured at <Q^2> =0.02357 +- 0.0001 GeV^2, <theta_lab> = 7.61 +- 0.02 degrees, and <E_lab> = 1.157 GeV with the Qweak apparatus at Jefferson Lab. Predictions using a simple Born approximation as well as more sophisticated distorted-wave calculations are in good agreement with this result. From this asymmetry the 27Al neutron radius R_n = 2.89 +- 0.12 fm was determined using a many-models correlation technique. The corresponding neutron skin thickness R_n-R_p = -0.04 +- 0.12 fm is small, as expected for a light nucleus with a neutron excess of only 1. This result thus serves as a successful benchmark for electroweak determinations of neutron radii on heavier nuclei. A tree-level approach was used to extract the 27Al weak radius R_w = 3.00 +- 0.15 fm, and the weak skin thickness R_wk - R_ch = -0.04 +- 0.15 fm. The weak form factor at this Q^2 is F_wk = 0.39 +- 0.04. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.15412v2-abstract-full').style.display = 'none'; document.getElementById('2112.15412v2-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> 11 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </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">Revised version after referee's comments and suggestions. Some improvements and clarification to the text, no changes to the figures, tables, results or conclusions. 7 pages, 3 figures, 3 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 128, 13250 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.02881">arXiv:2107.02881</a> <span> [<a href="https://arxiv.org/pdf/2107.02881">pdf</a>, <a href="https://arxiv.org/format/2107.02881">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Measurement of the $^{239}$Pu(n,f)/$^{235}$U(n,f) Cross-Section Ratio with the NIFFTE fission Time Projection Chamber </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Snyder%2C+L">L. Snyder</a>, <a href="/search/?searchtype=author&query=Anastasiou%2C+M">M. Anastasiou</a>, <a href="/search/?searchtype=author&query=Bowden%2C+N+S">N. S. Bowden</a>, <a href="/search/?searchtype=author&query=Bundgaard%2C+J">J. Bundgaard</a>, <a href="/search/?searchtype=author&query=Casperson%2C+R+J">R. J. Casperson</a>, <a href="/search/?searchtype=author&query=Cebra%2C+D+A">D. A. Cebra</a>, <a href="/search/?searchtype=author&query=Classen%2C+T">T. Classen</a>, <a href="/search/?searchtype=author&query=Dongwi%2C+D+H">D. H. Dongwi</a>, <a href="/search/?searchtype=author&query=Fotiades%2C+N">N. Fotiades</a>, <a href="/search/?searchtype=author&query=Gearhart%2C+J">J. Gearhart</a>, <a href="/search/?searchtype=author&query=Geppert-Kleinrath%2C+V">V. Geppert-Kleinrath</a>, <a href="/search/?searchtype=author&query=Greife%2C+U">U. Greife</a>, <a href="/search/?searchtype=author&query=Hagmann%2C+C">C. Hagmann</a>, <a href="/search/?searchtype=author&query=Heffner%2C+M">M. Heffner</a>, <a href="/search/?searchtype=author&query=Hensle%2C+D">D. Hensle</a>, <a href="/search/?searchtype=author&query=Higgins%2C+D">D. Higgins</a>, <a href="/search/?searchtype=author&query=Isenhower%2C+L+D">L. D. Isenhower</a>, <a href="/search/?searchtype=author&query=Kazkaz%2C+K">K. Kazkaz</a>, <a href="/search/?searchtype=author&query=Kemnitz%2C+A">A. Kemnitz</a>, <a href="/search/?searchtype=author&query=King%2C+J">J. King</a>, <a href="/search/?searchtype=author&query=Klay%2C+J+L">J. L. Klay</a>, <a href="/search/?searchtype=author&query=Latta%2C+J">J. Latta</a>, <a href="/search/?searchtype=author&query=Leal-Cidoncha%2C+E">E. Leal-Cidoncha</a>, <a href="/search/?searchtype=author&query=Loveland%2C+W">W. Loveland</a>, <a href="/search/?searchtype=author&query=Magee%2C+J+A">J. A. Magee</a> , et al. (15 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="2107.02881v1-abstract-short" style="display: inline;"> The $^{239}$Pu(n,f)/$^{235}$U(n,f) cross-section ratio has been measured with the fission Time Projection Chamber (fissionTPC) from 100 keV to 100 MeV. The fissionTPC provides three-dimensional reconstruction of fission-fragment ionization profiles, allowing for a precise quantification of measurement uncertainties. The measurement was performed at the Los Alamos Neutron Science Center which provi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.02881v1-abstract-full').style.display = 'inline'; document.getElementById('2107.02881v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.02881v1-abstract-full" style="display: none;"> The $^{239}$Pu(n,f)/$^{235}$U(n,f) cross-section ratio has been measured with the fission Time Projection Chamber (fissionTPC) from 100 keV to 100 MeV. The fissionTPC provides three-dimensional reconstruction of fission-fragment ionization profiles, allowing for a precise quantification of measurement uncertainties. The measurement was performed at the Los Alamos Neutron Science Center which provides a pulsed white source of neutrons. The data are recommended to be used as a cross-section ratio shape. A discussion of the status of the absolute normalization and comparisons to ENDF evaluations and previous measurements is included. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.02881v1-abstract-full').style.display = 'none'; document.getElementById('2107.02881v1-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 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.06063">arXiv:2106.06063</a> <span> [<a href="https://arxiv.org/pdf/2106.06063">pdf</a>, <a href="https://arxiv.org/format/2106.06063">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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/10.1016/j.nima.2021.165864">10.1016/j.nima.2021.165864 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of material isotopics and atom number ratio with alpha-particle spectroscopy for the NIFFTE fission Time Projection Chamber actinide target </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Monterial%2C+M">M. Monterial</a>, <a href="/search/?searchtype=author&query=Schmitt%2C+K+T">K. T. Schmitt</a>, <a href="/search/?searchtype=author&query=Prokop%2C+C">C. Prokop</a>, <a href="/search/?searchtype=author&query=Leal-Cidoncha%2C+E">E. Leal-Cidoncha</a>, <a href="/search/?searchtype=author&query=Anastasiou%2C+M">M. Anastasiou</a>, <a href="/search/?searchtype=author&query=Bowden%2C+N+S">N. S. Bowden</a>, <a href="/search/?searchtype=author&query=Bundgaard%2C+J">J. Bundgaard</a>, <a href="/search/?searchtype=author&query=Casperson%2C+R+J">R. J. Casperson</a>, <a href="/search/?searchtype=author&query=Cebra%2C+D+A">D. A. Cebra</a>, <a href="/search/?searchtype=author&query=Classen%2C+T">T. Classen</a>, <a href="/search/?searchtype=author&query=Dongwi%2C+D+H">D. H. Dongwi</a>, <a href="/search/?searchtype=author&query=Fotiades%2C+N">N. Fotiades</a>, <a href="/search/?searchtype=author&query=Gearhart%2C+J">J. Gearhart</a>, <a href="/search/?searchtype=author&query=Geppert-Kleinrath%2C+V">V. Geppert-Kleinrath</a>, <a href="/search/?searchtype=author&query=Greife%2C+U">U. Greife</a>, <a href="/search/?searchtype=author&query=Hagmann%2C+C">C. Hagmann</a>, <a href="/search/?searchtype=author&query=Heffner%2C+M">M. Heffner</a>, <a href="/search/?searchtype=author&query=Hensle%2C+D">D. Hensle</a>, <a href="/search/?searchtype=author&query=Higgins%2C+D">D. Higgins</a>, <a href="/search/?searchtype=author&query=Isenhower%2C+L+D">L. D. Isenhower</a>, <a href="/search/?searchtype=author&query=Kazkaz%2C+K">K. Kazkaz</a>, <a href="/search/?searchtype=author&query=Kemnitz%2C+A">A. Kemnitz</a>, <a href="/search/?searchtype=author&query=King%2C+J">J. King</a>, <a href="/search/?searchtype=author&query=Klay%2C+J+L">J. L. Klay</a>, <a href="/search/?searchtype=author&query=Latta%2C+J">J. Latta</a> , et al. (15 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="2106.06063v2-abstract-short" style="display: inline;"> We present the results of a measurement of isotopic concentrations and atomic number ratio of a double-sided actinide target with alpha-spectroscopy and mass spectrometry. The double-sided actinide target, with primarily Pu-239 on one side and U-235 on the other, was used in the fission Time Projection Chamber (fissionTPC) for a measurement of the neutron-induced fission cross-section ratio betwee… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.06063v2-abstract-full').style.display = 'inline'; document.getElementById('2106.06063v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.06063v2-abstract-full" style="display: none;"> We present the results of a measurement of isotopic concentrations and atomic number ratio of a double-sided actinide target with alpha-spectroscopy and mass spectrometry. The double-sided actinide target, with primarily Pu-239 on one side and U-235 on the other, was used in the fission Time Projection Chamber (fissionTPC) for a measurement of the neutron-induced fission cross-section ratio between the two isotopes. The measured atomic number ratio is intended to provide an absolute normalization of the measured fission cross-section ratio. The Pu-239/U-235 atom number ratio was measured with a combination of mass spectrometry and alpha-spectroscopy with a planar silicon detector with uncertainties of less than 1%. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.06063v2-abstract-full').style.display = 'none'; document.getElementById('2106.06063v2-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> 9 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2021. </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, 5 figures, 6 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2103.09758">arXiv:2103.09758</a> <span> [<a href="https://arxiv.org/pdf/2103.09758">pdf</a>, <a href="https://arxiv.org/format/2103.09758">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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/10.1103/PhysRevC.104.014606">10.1103/PhysRevC.104.014606 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the Beam-Normal Single-Spin Asymmetry for Elastic Electron Scattering from $^{12}$C and $^{27}$Al </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=QWeak+Collaboration"> QWeak Collaboration</a>, <a href="/search/?searchtype=author&query=Androic%2C+D">D. Androic</a>, <a href="/search/?searchtype=author&query=Armstrong%2C+D+S">D. S. Armstrong</a>, <a href="/search/?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/?searchtype=author&query=Bartlett%2C+K">K. Bartlett</a>, <a href="/search/?searchtype=author&query=Beminiwattha%2C+R+S">R. S. Beminiwattha</a>, <a href="/search/?searchtype=author&query=Benesch%2C+J">J. Benesch</a>, <a href="/search/?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/?searchtype=author&query=Birchall%2C+J">J. Birchall</a>, <a href="/search/?searchtype=author&query=Carlini%2C+R+D">R. D. Carlini</a>, <a href="/search/?searchtype=author&query=Christy%2C+M+E">M. E. Christy</a>, <a href="/search/?searchtype=author&query=Cornejo%2C+J+C">J. C. Cornejo</a>, <a href="/search/?searchtype=author&query=Dusa%2C+S+C">S. Covrig Dusa</a>, <a href="/search/?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/?searchtype=author&query=Davis%2C+C+A">C. A. Davis</a>, <a href="/search/?searchtype=author&query=Deconinck%2C+W">W. Deconinck</a>, <a href="/search/?searchtype=author&query=Dowd%2C+J+F">J. F. Dowd</a>, <a href="/search/?searchtype=author&query=Dunne%2C+J+A">J. A. Dunne</a>, <a href="/search/?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/?searchtype=author&query=Duvall%2C+W+S">W. S. Duvall</a>, <a href="/search/?searchtype=author&query=Elassar%2C+M">M. Elassar</a>, <a href="/search/?searchtype=author&query=Falk%2C+W+R">W. R. Falk</a>, <a href="/search/?searchtype=author&query=Finn%2C+J+M">J. M. Finn</a>, <a href="/search/?searchtype=author&query=Forest%2C+T">T. Forest</a>, <a href="/search/?searchtype=author&query=Gal%2C+C">C. Gal</a> , et al. (60 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="2103.09758v2-abstract-short" style="display: inline;"> We report measurements of the parity-conserving beam-normal single-spin elastic scattering asymmetries $B_n$ on $^{12}$C and $^{27}$Al, obtained with an electron beam polarized transverse to its momentum direction. These measurements add an additional kinematic point to a series of previous measurements of $B_n$ on $^{12}$C and provide a first measurement on $^{27}$Al. The experiment utilized the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.09758v2-abstract-full').style.display = 'inline'; document.getElementById('2103.09758v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.09758v2-abstract-full" style="display: none;"> We report measurements of the parity-conserving beam-normal single-spin elastic scattering asymmetries $B_n$ on $^{12}$C and $^{27}$Al, obtained with an electron beam polarized transverse to its momentum direction. These measurements add an additional kinematic point to a series of previous measurements of $B_n$ on $^{12}$C and provide a first measurement on $^{27}$Al. The experiment utilized the Qweak apparatus at Jefferson Lab with a beam energy of 1.158 GeV. The average lab scattering angle for both targets was 7.7 degrees, and the average $Q^2$ for both targets was 0.02437 GeV$^2$ (Q=0.1561 GeV). The asymmetries are $B_n$ = -10.68 $\pm$ 0.90 stat) $\pm$ 0.57 (syst) ppm for $^{12}$C and $B_n$ = -12.16 $\pm$ 0.58 (stat) $\pm$ 0.62 (syst) ppm for $^{27}$Al. The results are consistent with theoretical predictions, and are compared to existing data. When scaled by Z/A, the Q-dependence of all the far-forward angle (theta < 10 degrees) data from $^{1}$H to $^{27}$Al can be described by the same slope out to $Q \approx 0.35$ GeV. Larger-angle data from other experiments in the same Q range are consistent with a slope about twice as steep. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.09758v2-abstract-full').style.display = 'none'; document.getElementById('2103.09758v2-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> 18 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2021. </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">Minor changes after refereeing; version as accepted for Physical Review C. Cosmetic changes to several figures, one author added. 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> Phys. Rev. C 104, 014606 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.12435">arXiv:2006.12435</a> <span> [<a href="https://arxiv.org/pdf/2006.12435">pdf</a>, <a href="https://arxiv.org/format/2006.12435">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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/10.1103/PhysRevLett.125.112502">10.1103/PhysRevLett.125.112502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Precision Measurement of the Beam-Normal Single-Spin Asymmetry in Forward-Angle Elastic Electron-Proton Scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=QWeak+collaboration"> QWeak collaboration</a>, <a href="/search/?searchtype=author&query=Androic%2C+D">D. Androic</a>, <a href="/search/?searchtype=author&query=Armstrong%2C+D+S">D. S. Armstrong</a>, <a href="/search/?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/?searchtype=author&query=Bartlett%2C+K">K. Bartlett</a>, <a href="/search/?searchtype=author&query=Beaufait%2C+J">J. Beaufait</a>, <a href="/search/?searchtype=author&query=Beminiwattha%2C+R+S">R. S. Beminiwattha</a>, <a href="/search/?searchtype=author&query=Benesch%2C+J">J. Benesch</a>, <a href="/search/?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/?searchtype=author&query=Birchall%2C+J">J. Birchall</a>, <a href="/search/?searchtype=author&query=Carlini%2C+R+D">R. D. Carlini</a>, <a href="/search/?searchtype=author&query=Cornejo%2C+J+C">J. C. Cornejo</a>, <a href="/search/?searchtype=author&query=Dusa%2C+S+C">S. Covrig Dusa</a>, <a href="/search/?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/?searchtype=author&query=Davis%2C+C+A">C. A. Davis</a>, <a href="/search/?searchtype=author&query=Deconinck%2C+W">W. Deconinck</a>, <a href="/search/?searchtype=author&query=Dowd%2C+J+F">J. F. Dowd</a>, <a href="/search/?searchtype=author&query=Dunne%2C+J+A">J. A. Dunne</a>, <a href="/search/?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/?searchtype=author&query=Duvall%2C+W+S">W. S. Duvall</a>, <a href="/search/?searchtype=author&query=Elaasar%2C+M">M. Elaasar</a>, <a href="/search/?searchtype=author&query=Falk%2C+W+R">W. R. Falk</a>, <a href="/search/?searchtype=author&query=Finn%2C+J+M">J. M. Finn</a>, <a href="/search/?searchtype=author&query=Forest%2C+T">T. Forest</a>, <a href="/search/?searchtype=author&query=Gal%2C+C">C. Gal</a> , et al. (70 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="2006.12435v2-abstract-short" style="display: inline;"> A beam-normal single-spin asymmetry generated in the scattering of transversely polarized electrons from unpolarized nucleons is an observable related to the imaginary part of the two-photon exchange process. We report a 2% precision measurement of the beam-normal single-spin asymmetry in elastic electron-proton scattering with a mean scattering angle of theta_lab = 7.9 degrees and a mean energy o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.12435v2-abstract-full').style.display = 'inline'; document.getElementById('2006.12435v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.12435v2-abstract-full" style="display: none;"> A beam-normal single-spin asymmetry generated in the scattering of transversely polarized electrons from unpolarized nucleons is an observable related to the imaginary part of the two-photon exchange process. We report a 2% precision measurement of the beam-normal single-spin asymmetry in elastic electron-proton scattering with a mean scattering angle of theta_lab = 7.9 degrees and a mean energy of 1.149 GeV. The asymmetry result is B_n = -5.194 +- 0.067 (stat) +- 0.082 (syst) ppm. This is the most precise measurement of this quantity available to date and therefore provides a stringent test of two-photon exchange models at far-forward scattering angles (theta_lab -> 0) where they should be most reliable. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.12435v2-abstract-full').style.display = 'none'; document.getElementById('2006.12435v2-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 August, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </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">6 pages, 3 figures; Slightly revised version, after referee's comments; accepted in PRL</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 125, 112502 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2001.09381">arXiv:2001.09381</a> <span> [<a href="https://arxiv.org/pdf/2001.09381">pdf</a>, <a href="https://arxiv.org/format/2001.09381">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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/10.1103/PhysRevC.102.014605">10.1103/PhysRevC.102.014605 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Neutron Induced Fission Fragment Angular Distributions, Anisotropy, and Linear Momentum Transfer Measured with the NIFFTE Fission Time Projection Chamber </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Hensle%2C+D">D. Hensle</a>, <a href="/search/?searchtype=author&query=Barker%2C+J+T">J. T. Barker</a>, <a href="/search/?searchtype=author&query=Barrett%2C+J+S">J. S. Barrett</a>, <a href="/search/?searchtype=author&query=Bowden%2C+N+S">N. S. Bowden</a>, <a href="/search/?searchtype=author&query=Brewster%2C+K+J">K. J. Brewster</a>, <a href="/search/?searchtype=author&query=Bundgaard%2C+J">J. Bundgaard</a>, <a href="/search/?searchtype=author&query=Case%2C+Z+Q">Z. Q. Case</a>, <a href="/search/?searchtype=author&query=Casperson%2C+R+J">R. J. Casperson</a>, <a href="/search/?searchtype=author&query=Cebra%2C+D+A">D. A. Cebra</a>, <a href="/search/?searchtype=author&query=Classen%2C+T">T. Classen</a>, <a href="/search/?searchtype=author&query=Duke%2C+D+L">D. L. Duke</a>, <a href="/search/?searchtype=author&query=Fotiadis%2C+N">N. Fotiadis</a>, <a href="/search/?searchtype=author&query=Gearhart%2C+J">J Gearhart</a>, <a href="/search/?searchtype=author&query=Geppert-Kleinrath%2C+V">V. Geppert-Kleinrath</a>, <a href="/search/?searchtype=author&query=Greife%2C+U">U. Greife</a>, <a href="/search/?searchtype=author&query=Guardincerri%2C+E">E. Guardincerri</a>, <a href="/search/?searchtype=author&query=Hagmann%2C+C">C. Hagmann</a>, <a href="/search/?searchtype=author&query=Heffner%2C+M">M. Heffner</a>, <a href="/search/?searchtype=author&query=Hicks%2C+C+R">C. R. Hicks</a>, <a href="/search/?searchtype=author&query=Higgins%2C+D">D. Higgins</a>, <a href="/search/?searchtype=author&query=Isenhower%2C+L+D">L. D. Isenhower</a>, <a href="/search/?searchtype=author&query=Kazkaz%2C+K">K. Kazkaz</a>, <a href="/search/?searchtype=author&query=Kemnitz%2C+A">A. Kemnitz</a>, <a href="/search/?searchtype=author&query=Kiesling%2C+K+J">K. J. Kiesling</a>, <a href="/search/?searchtype=author&query=King%2C+J">J. King</a> , et al. (24 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="2001.09381v1-abstract-short" style="display: inline;"> The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration has performed measurements with a fission time projection chamber (fissionTPC) to study the fission process by reconstructing full three-dimensional tracks of fission fragments and other ionizing radiation. The amount of linear momentum imparted to the fissioning nucleus by the incident neutron can be inferred by measu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2001.09381v1-abstract-full').style.display = 'inline'; document.getElementById('2001.09381v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2001.09381v1-abstract-full" style="display: none;"> The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration has performed measurements with a fission time projection chamber (fissionTPC) to study the fission process by reconstructing full three-dimensional tracks of fission fragments and other ionizing radiation. The amount of linear momentum imparted to the fissioning nucleus by the incident neutron can be inferred by measuring the opening angle between the fission fragments. Using this measured linear momentum, fission fragment angular distributions can be converted to the center-of-mass frame for anisotropy measurements. Angular anisotropy is an important experimental observable for understanding the quantum mechanical state of the fissioning nucleus and vital to determining detection efficiency for cross section measurements. Neutron linear momentum transfer to fissioning $^{235}$U, $^{238}$U, and $^{239}$Pu and fission fragment angular anisotropy of $^{235}$U and $^{238}$U as a function of neutron energies in the range 130 keV--250 MeV are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2001.09381v1-abstract-full').style.display = 'none'; document.getElementById('2001.09381v1-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> 25 January, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 102, 014605 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.14591">arXiv:1910.14591</a> <span> [<a href="https://arxiv.org/pdf/1910.14591">pdf</a>, <a href="https://arxiv.org/format/1910.14591">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</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/10.1103/PhysRevC.101.055503">10.1103/PhysRevC.101.055503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Parity-Violating Inelastic Electron-Proton Scattering at Low $Q^2$ Above the Resonance Region </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=QWeak+Collaboration"> QWeak Collaboration</a>, <a href="/search/?searchtype=author&query=Androic%2C+D">D. Androic</a>, <a href="/search/?searchtype=author&query=Armstrong%2C+D+S">D. S. Armstrong</a>, <a href="/search/?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/?searchtype=author&query=Bartlett%2C+K">K. Bartlett</a>, <a href="/search/?searchtype=author&query=Beminiwattha%2C+R+S">R. S. Beminiwattha</a>, <a href="/search/?searchtype=author&query=Benesch%2C+J">J. Benesch</a>, <a href="/search/?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/?searchtype=author&query=Birchall%2C+J">J. Birchall</a>, <a href="/search/?searchtype=author&query=Carlini%2C+R+D">R. D. Carlini</a>, <a href="/search/?searchtype=author&query=Cornejo%2C+J+C">J. C. Cornejo</a>, <a href="/search/?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/?searchtype=author&query=Davis%2C+C+A">C. A. Davis</a>, <a href="/search/?searchtype=author&query=Deconinck%2C+W">W. Deconinck</a>, <a href="/search/?searchtype=author&query=Dowd%2C+J+F">J. F. Dowd</a>, <a href="/search/?searchtype=author&query=Dunne%2C+J+A">J. A. Dunne</a>, <a href="/search/?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/?searchtype=author&query=Duvall%2C+W+S">W. S. Duvall</a>, <a href="/search/?searchtype=author&query=Falk%2C+W+R">W. R. Falk</a>, <a href="/search/?searchtype=author&query=Finn%2C+J+M">J. M. Finn</a>, <a href="/search/?searchtype=author&query=Gal%2C+C">C. Gal</a>, <a href="/search/?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/?searchtype=author&query=Gericke%2C+M+T+W">M. T. W. Gericke</a>, <a href="/search/?searchtype=author&query=Grames%2C+J">J. Grames</a>, <a href="/search/?searchtype=author&query=Guo%2C+F">F. Guo</a> , et al. (52 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="1910.14591v2-abstract-short" style="display: inline;"> We report the measurement of the parity-violating asymmetry for the inelastic scattering of electrons from the proton, at $Q^2 = 0.082$ GeV$^2$ and $ W = 2.23$ GeV, above the resonance region. The result $A_{\rm Inel} = - 13.5 \pm 2.0 ({\rm stat}) \pm 3.9 ({\rm syst})$~ppm agrees with theoretical calculations, and helps to validate the modeling of the $纬Z$ interference structure functions… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.14591v2-abstract-full').style.display = 'inline'; document.getElementById('1910.14591v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.14591v2-abstract-full" style="display: none;"> We report the measurement of the parity-violating asymmetry for the inelastic scattering of electrons from the proton, at $Q^2 = 0.082$ GeV$^2$ and $ W = 2.23$ GeV, above the resonance region. The result $A_{\rm Inel} = - 13.5 \pm 2.0 ({\rm stat}) \pm 3.9 ({\rm syst})$~ppm agrees with theoretical calculations, and helps to validate the modeling of the $纬Z$ interference structure functions $F_1^{纬Z}$ and $F_2^{纬Z}$ used in those calculations, which are also used for determination of the two-boson exchange box diagram ($\Box_{纬Z}$) contribution to parity-violating elastic scattering measurements. A positive parity-violating asymmetry for inclusive $蟺^-$ production was observed, as well as positive beam-normal single-spin asymmetry for scattered electrons and a negative beam-normal single-spin asymmetry for inclusive $蟺^-$ production. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.14591v2-abstract-full').style.display = 'none'; document.getElementById('1910.14591v2-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> 12 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </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">18 pages, 9 figures, version accepted in Physical Review C</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 101, 055503 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.08283">arXiv:1905.08283</a> <span> [<a href="https://arxiv.org/pdf/1905.08283">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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/s41586-018-0096-0">10.1038/s41586-018-0096-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Precision Measurement of the Weak Charge of the Proton </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Androic%2C+D">D. Androic</a>, <a href="/search/?searchtype=author&query=Armstrong%2C+D+S">D. S. Armstrong</a>, <a href="/search/?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/?searchtype=author&query=Averett%2C+T">T. Averett</a>, <a href="/search/?searchtype=author&query=Balewski%2C+J">J. Balewski</a>, <a href="/search/?searchtype=author&query=Bartlett%2C+K">K. Bartlett</a>, <a href="/search/?searchtype=author&query=Beaufait%2C+J">J. Beaufait</a>, <a href="/search/?searchtype=author&query=Beminiwattha%2C+R+S">R. S. Beminiwattha</a>, <a href="/search/?searchtype=author&query=Benesch%2C+J">J. Benesch</a>, <a href="/search/?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/?searchtype=author&query=Birchall%2C+J">J. Birchall</a>, <a href="/search/?searchtype=author&query=Carlini%2C+R+D">R. D. Carlini</a>, <a href="/search/?searchtype=author&query=Cornejo%2C+J+C">J. C. Cornejo</a>, <a href="/search/?searchtype=author&query=Dusa%2C+S+C">S. Covrig Dusa</a>, <a href="/search/?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/?searchtype=author&query=Davis%2C+C+A">C. A. Davis</a>, <a href="/search/?searchtype=author&query=Deconinck%2C+W">W. Deconinck</a>, <a href="/search/?searchtype=author&query=Diefenbach%2C+J">J. Diefenbach</a>, <a href="/search/?searchtype=author&query=Dowd%2C+J+F">J. F. Dowd</a>, <a href="/search/?searchtype=author&query=Dunne%2C+J+A">J. A. Dunne</a>, <a href="/search/?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/?searchtype=author&query=Duvall%2C+W+S">W. S. Duvall</a>, <a href="/search/?searchtype=author&query=Elaasar%2C+M">M. Elaasar</a>, <a href="/search/?searchtype=author&query=Falk%2C+W+R">W. R. Falk</a>, <a href="/search/?searchtype=author&query=Finn%2C+J+M">J. M. Finn</a> , et al. (74 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="1905.08283v1-abstract-short" style="display: inline;"> The fields of particle and nuclear physics have undertaken extensive programs to search for evidence of physics beyond that explained by current theories. The observation of the Higgs boson at the Large Hadron Collider completed the set of particles predicted by the Standard Model (SM), currently the best description of fundamental particles and forces. However, the theory's limitations include a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.08283v1-abstract-full').style.display = 'inline'; document.getElementById('1905.08283v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.08283v1-abstract-full" style="display: none;"> The fields of particle and nuclear physics have undertaken extensive programs to search for evidence of physics beyond that explained by current theories. The observation of the Higgs boson at the Large Hadron Collider completed the set of particles predicted by the Standard Model (SM), currently the best description of fundamental particles and forces. However, the theory's limitations include a failure to predict fundamental parameters and the inability to account for dark matter/energy, gravity, and the matter-antimater asymmetry in the universe, among other phenomena. Given the lack of additional particles found so far through direct searches in the post-Higgs era, indirect searches utilizing precise measurements of well predicted SM observables allow highly targeted alternative tests for physics beyond the SM. Indirect searches have the potential to reach mass/energy scales beyond those directly accessible by today's high-energy accelerators. The value of the weak charge of the proton Q_W^p is an example of such an indirect search, as it sets the strength of the proton's interaction with particles via the well-predicted neutral electroweak force. Parity violation (invariance under spatial inversion (x,y,z) -> (-x,-y,-z)) is violated only in the weak interaction, thus providing a unique tool to isolate the weak interaction in order to measure the proton's weak charge. Here we report Q_W^p=0.0719+-0.0045, as extracted from our measured parity-violating (PV) polarized electron-proton scattering asymmetry, A_ep=-226.5+-9.3 ppb. Our value of Q_W^p is in excellent agreement with the SM, and sets multi-TeV-scale constraints on any semi-leptonic PV physics not described within the SM. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.08283v1-abstract-full').style.display = 'none'; document.getElementById('1905.08283v1-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, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </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">Direct link to Nature Version "https://rdcu.be/954U"</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature 557, 207-211 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1904.10558">arXiv:1904.10558</a> <span> [<a href="https://arxiv.org/pdf/1904.10558">pdf</a>, <a href="https://arxiv.org/ps/1904.10558">ps</a>, <a href="https://arxiv.org/format/1904.10558">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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> <p class="title is-5 mathjax"> 1H(n,el) as a Cross Section Reference in a White Source Neutron Beam With the fissionTPC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Walsh%2C+N+I">N. I. Walsh</a>, <a href="/search/?searchtype=author&query=Barker%2C+J+T">J. T. Barker</a>, <a href="/search/?searchtype=author&query=Bowden%2C+N+S">N. S. Bowden</a>, <a href="/search/?searchtype=author&query=Brewster%2C+K+J">K. J. Brewster</a>, <a href="/search/?searchtype=author&query=Casperson%2C+R+J">R. J. Casperson</a>, <a href="/search/?searchtype=author&query=Classen%2C+T">T. Classen</a>, <a href="/search/?searchtype=author&query=Fotiadis%2C+N">N. Fotiadis</a>, <a href="/search/?searchtype=author&query=Greife%2C+U">U. Greife</a>, <a href="/search/?searchtype=author&query=Guardincerri%2C+E">E. Guardincerri</a>, <a href="/search/?searchtype=author&query=Hagmann%2C+C">C. Hagmann</a>, <a href="/search/?searchtype=author&query=Heffner%2C+M">M. Heffner</a>, <a href="/search/?searchtype=author&query=Hensle%2C+D">D. Hensle</a>, <a href="/search/?searchtype=author&query=Hicks%2C+C+R">C. R. Hicks</a>, <a href="/search/?searchtype=author&query=Higgins%2C+D">D. Higgins</a>, <a href="/search/?searchtype=author&query=Isenhower%2C+L+D">L. D. Isenhower</a>, <a href="/search/?searchtype=author&query=Kemnitz%2C+A">A. Kemnitz</a>, <a href="/search/?searchtype=author&query=Kiesling%2C+K+J">K. J. Kiesling</a>, <a href="/search/?searchtype=author&query=King%2C+J">J. King</a>, <a href="/search/?searchtype=author&query=Klay%2C+J+L">J. L. Klay</a>, <a href="/search/?searchtype=author&query=Latta%2C+J">J. Latta</a>, <a href="/search/?searchtype=author&query=Loveland%2C+W">W. Loveland</a>, <a href="/search/?searchtype=author&query=Magee%2C+J+A">J. A. Magee</a>, <a href="/search/?searchtype=author&query=Mendenhall%2C+M+P">M. P. Mendenhall</a>, <a href="/search/?searchtype=author&query=Monterial%2C+M">M. Monterial</a>, <a href="/search/?searchtype=author&query=Mosby%2C+S">S. Mosby</a> , et al. (11 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="1904.10558v1-abstract-short" style="display: inline;"> We provide a quantitative description of a method to measure neutron-induced fission cross sections in ratio to elastic hydrogen scattering in a white-source neutron beam with the fission Time Projection Chamber. This detector has measured precision fission cross section ratios using actinide references such as $^{235}$U(n,f) and $^{238}$U(n,f). However, by employing a more precise reference such… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.10558v1-abstract-full').style.display = 'inline'; document.getElementById('1904.10558v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1904.10558v1-abstract-full" style="display: none;"> We provide a quantitative description of a method to measure neutron-induced fission cross sections in ratio to elastic hydrogen scattering in a white-source neutron beam with the fission Time Projection Chamber. This detector has measured precision fission cross section ratios using actinide references such as $^{235}$U(n,f) and $^{238}$U(n,f). However, by employing a more precise reference such as the H(n,el) cross section there is the potential to further reduce the evaluation uncertainties of the measured cross sections. In principle the fissionTPC could provide a unique measurement by simultaneously measuring both fission fragments and proton recoils over a large solid angle. We investigate one method with a hydrogenous gas target and with the neutron energy determined by the proton recoil kinematics. This method enables the measurement to be performed in a white-source neutron beam and with the current configuration of the fissionTPC. We show that while such a measurement is feasible in the energy range of 0.5 MeV to $\sim$10 MeV, uncertainties on the proton detection efficiency and the neutron energy resolution do not allow us to preform a fission ratio measurement to the desired precision. Utilizing either a direct measurement of the neutron time-of-flight for the recoil proton or a mono-energetic neutron source or some combination of both would provide a path to a sub-percent precision measurement. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.10558v1-abstract-full').style.display = 'none'; document.getElementById('1904.10558v1-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> 23 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> LLNL-JRNL-769047 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.08721">arXiv:1802.08721</a> <span> [<a href="https://arxiv.org/pdf/1802.08721">pdf</a>, <a href="https://arxiv.org/format/1802.08721">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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/10.1103/PhysRevC.97.034618">10.1103/PhysRevC.97.034618 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the normalized $^{238}$U(n,f)/$^{235}$U(n,f) cross section ratio from threshold to 30 MeV with the fission Time Projection Chamber </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Casperson%2C+R+J">R. J. Casperson</a>, <a href="/search/?searchtype=author&query=Asner%2C+D+M">D. M. Asner</a>, <a href="/search/?searchtype=author&query=Baker%2C+J">J. Baker</a>, <a href="/search/?searchtype=author&query=Baker%2C+R+G">R. G. Baker</a>, <a href="/search/?searchtype=author&query=Barrett%2C+J+S">J. S. Barrett</a>, <a href="/search/?searchtype=author&query=Bowden%2C+N+S">N. S. Bowden</a>, <a href="/search/?searchtype=author&query=Brune%2C+C">C. Brune</a>, <a href="/search/?searchtype=author&query=Bundgaard%2C+J">J. Bundgaard</a>, <a href="/search/?searchtype=author&query=Burgett%2C+E">E. Burgett</a>, <a href="/search/?searchtype=author&query=Cebra%2C+D+A">D. A. Cebra</a>, <a href="/search/?searchtype=author&query=Classen%2C+T">T. Classen</a>, <a href="/search/?searchtype=author&query=Cunningham%2C+M">M. Cunningham</a>, <a href="/search/?searchtype=author&query=Deaven%2C+J">J. Deaven</a>, <a href="/search/?searchtype=author&query=Duke%2C+D+L">D. L. Duke</a>, <a href="/search/?searchtype=author&query=Ferguson%2C+I">I. Ferguson</a>, <a href="/search/?searchtype=author&query=Gearhart%2C+J">J. Gearhart</a>, <a href="/search/?searchtype=author&query=Geppert-Kleinrath%2C+V">V. Geppert-Kleinrath</a>, <a href="/search/?searchtype=author&query=Greife%2C+U">U. Greife</a>, <a href="/search/?searchtype=author&query=Grimes%2C+S">S. Grimes</a>, <a href="/search/?searchtype=author&query=Guardincerri%2C+E">E. Guardincerri</a>, <a href="/search/?searchtype=author&query=Hager%2C+U">U. Hager</a>, <a href="/search/?searchtype=author&query=Hagmann%2C+C">C. Hagmann</a>, <a href="/search/?searchtype=author&query=Heffner%2C+M">M. Heffner</a>, <a href="/search/?searchtype=author&query=Hensle%2C+D">D. Hensle</a>, <a href="/search/?searchtype=author&query=Hertel%2C+N">N. Hertel</a> , et al. (39 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="1802.08721v1-abstract-short" style="display: inline;"> The normalized $^{238}$U(n,f)/$^{235}$U(n,f) cross section ratio has been measured using the NIFFTE fission Time Projection Chamber from the reaction threshold to $30$~MeV. The fissionTPC is a two-volume MICROMEGAS time projection chamber that allows for full three-dimensional reconstruction of fission-fragment ionization profiles from neutron-induced fission. The measurement was performed at the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.08721v1-abstract-full').style.display = 'inline'; document.getElementById('1802.08721v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.08721v1-abstract-full" style="display: none;"> The normalized $^{238}$U(n,f)/$^{235}$U(n,f) cross section ratio has been measured using the NIFFTE fission Time Projection Chamber from the reaction threshold to $30$~MeV. The fissionTPC is a two-volume MICROMEGAS time projection chamber that allows for full three-dimensional reconstruction of fission-fragment ionization profiles from neutron-induced fission. The measurement was performed at the Los Alamos Neutron Science Center, where the neutron energy is determined from neutron time-of-flight. The $^{238}$U(n,f)/$^{235}$U(n,f) ratio reported here is the first cross section measurement made with the fissionTPC, and will provide new experimental data for evaluation of the $^{238}$U(n,f) cross section, an important standard used in neutron-flux measurements. Use of a development target in this work prevented the determination of an absolute normalization, to be addressed in future measurements. Instead, the measured cross section ratio has been normalized to ENDF/B-VIII.$尾$5 at 14.5 MeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.08721v1-abstract-full').style.display = 'none'; document.getElementById('1802.08721v1-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> 23 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2018. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.01830">arXiv:1712.01830</a> <span> [<a href="https://arxiv.org/pdf/1712.01830">pdf</a>, <a href="https://arxiv.org/format/1712.01830">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="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.2017.10.028">10.1016/j.nima.2017.10.028 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Performance of a MICROMEGAS-based TPC in a high-energy neutron beam </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Snyder%2C+L">Lucas Snyder</a>, <a href="/search/?searchtype=author&query=Manning%2C+B">Brett Manning</a>, <a href="/search/?searchtype=author&query=Bowden%2C+N+S">Nathaniel S. Bowden</a>, <a href="/search/?searchtype=author&query=Bundgaard%2C+J">Jeremy Bundgaard</a>, <a href="/search/?searchtype=author&query=Casperson%2C+R+J">Robert J. Casperson</a>, <a href="/search/?searchtype=author&query=Cebra%2C+D+A">Daniel A. Cebra</a>, <a href="/search/?searchtype=author&query=Classen%2C+T">Timothy Classen</a>, <a href="/search/?searchtype=author&query=Duke%2C+D+L">Dana L. Duke</a>, <a href="/search/?searchtype=author&query=Gearhart%2C+J">Joshua Gearhart</a>, <a href="/search/?searchtype=author&query=Greife%2C+U">Uwe Greife</a>, <a href="/search/?searchtype=author&query=Hagmann%2C+C">Christian Hagmann</a>, <a href="/search/?searchtype=author&query=Heffner%2C+M">Michael Heffner</a>, <a href="/search/?searchtype=author&query=Hensle%2C+D">David Hensle</a>, <a href="/search/?searchtype=author&query=Higgins%2C+D">Daniel Higgins</a>, <a href="/search/?searchtype=author&query=Isenhower%2C+D">Donald Isenhower</a>, <a href="/search/?searchtype=author&query=King%2C+J">Jonathan King</a>, <a href="/search/?searchtype=author&query=Klay%2C+J+L">Jennifer L. Klay</a>, <a href="/search/?searchtype=author&query=Geppert-Kleinrath%2C+V">Verena Geppert-Kleinrath</a>, <a href="/search/?searchtype=author&query=Loveland%2C+W">Walter Loveland</a>, <a href="/search/?searchtype=author&query=Magee%2C+J+A">Joshua A. Magee</a>, <a href="/search/?searchtype=author&query=Mendenhall%2C+M+P">Michael P. Mendenhall</a>, <a href="/search/?searchtype=author&query=Sangiorgio%2C+S">Samuele Sangiorgio</a>, <a href="/search/?searchtype=author&query=Seilhan%2C+B">Brandon Seilhan</a>, <a href="/search/?searchtype=author&query=Schmitt%2C+K+T">Kyle T. Schmitt</a>, <a href="/search/?searchtype=author&query=Tovesson%2C+F">Fredrik Tovesson</a> , et al. (5 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="1712.01830v1-abstract-short" style="display: inline;"> The MICROMEGAS (MICRO-MEsh GAseous Structure) charge amplification structure has found wide use in many detection applications, especially as a gain stage for the charge readout of Time Projection Chambers (TPCs). Here we report on the behavior of a MICROMEGAS TPC when operated in a high-energy (up to 800 MeV) neutron beam. It is found that neutron-induced reactions can cause discharges in some dr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.01830v1-abstract-full').style.display = 'inline'; document.getElementById('1712.01830v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.01830v1-abstract-full" style="display: none;"> The MICROMEGAS (MICRO-MEsh GAseous Structure) charge amplification structure has found wide use in many detection applications, especially as a gain stage for the charge readout of Time Projection Chambers (TPCs). Here we report on the behavior of a MICROMEGAS TPC when operated in a high-energy (up to 800 MeV) neutron beam. It is found that neutron-induced reactions can cause discharges in some drift gas mixtures that are stable in the absence of the neutron beam. The discharges result from recoil ions close to the MICROMEGAS that deposit high specific ionization density and have a limited diffusion time. For a binary drift gas, increasing the percentage of the molecular component (quench gas) relative to the noble component and operating at lower pressures generally improves stability. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.01830v1-abstract-full').style.display = 'none'; document.getElementById('1712.01830v1-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> 4 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Inst. and Methods in Physics Research, A 881 (2018) 1-8 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1710.00973">arXiv:1710.00973</a> <span> [<a href="https://arxiv.org/pdf/1710.00973">pdf</a>, <a href="https://arxiv.org/format/1710.00973">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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/10.1103/PhysRevC.99.064619">10.1103/PhysRevC.99.064619 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Fission Fragment Angular Anisotropy in Neutron-Induced Fission of $^{235}$U Measured with a Time Projection Chamber </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Geppert-Kleinrath%2C+V">V. Geppert-Kleinrath</a>, <a href="/search/?searchtype=author&query=Tovesson%2C+F">F. Tovesson</a>, <a href="/search/?searchtype=author&query=Barrett%2C+J+S">J. S. Barrett</a>, <a href="/search/?searchtype=author&query=Bowden%2C+N+S">N. S. Bowden</a>, <a href="/search/?searchtype=author&query=Bundgaard%2C+J">J. Bundgaard</a>, <a href="/search/?searchtype=author&query=Casperson%2C+R+J">R. J. Casperson</a>, <a href="/search/?searchtype=author&query=Cebra%2C+D+A">D. A. Cebra</a>, <a href="/search/?searchtype=author&query=Classen%2C+T">T. Classen</a>, <a href="/search/?searchtype=author&query=Cunningham%2C+M">M. Cunningham</a>, <a href="/search/?searchtype=author&query=Duke%2C+D+L">D. L. Duke</a>, <a href="/search/?searchtype=author&query=Gearhart%2C+J">J. Gearhart</a>, <a href="/search/?searchtype=author&query=Greife%2C+U">U. Greife</a>, <a href="/search/?searchtype=author&query=Guardincerri%2C+E">E. Guardincerri</a>, <a href="/search/?searchtype=author&query=Hagmann%2C+C">C. Hagmann</a>, <a href="/search/?searchtype=author&query=Heffner%2C+M">M. Heffner</a>, <a href="/search/?searchtype=author&query=Hensle%2C+D">D. Hensle</a>, <a href="/search/?searchtype=author&query=Higgins%2C+D">D. Higgins</a>, <a href="/search/?searchtype=author&query=Isenhower%2C+L+D">L. D. Isenhower</a>, <a href="/search/?searchtype=author&query=King%2C+J">J. King</a>, <a href="/search/?searchtype=author&query=Klay%2C+J+L">J. L. Klay</a>, <a href="/search/?searchtype=author&query=Loveland%2C+W">W. Loveland</a>, <a href="/search/?searchtype=author&query=Magee%2C+J+A">J. A. Magee</a>, <a href="/search/?searchtype=author&query=Manning%2C+B">B. Manning</a>, <a href="/search/?searchtype=author&query=Mendenhall%2C+M+P">M. P. Mendenhall</a>, <a href="/search/?searchtype=author&query=Ruz%2C+J">J. Ruz</a> , et al. (11 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="1710.00973v2-abstract-short" style="display: inline;"> Fission fragment angular distributions can provide an important constraint on fission theory, improving predictive fission codes, and are a prerequisite for a precise ratio cross section measurement. Available anisotropy data is sparse, especially at neutron energies above 5 MeV. For the first time, a three-dimensional tracking detector is employed to study fragment emission angles and provide a d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.00973v2-abstract-full').style.display = 'inline'; document.getElementById('1710.00973v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1710.00973v2-abstract-full" style="display: none;"> Fission fragment angular distributions can provide an important constraint on fission theory, improving predictive fission codes, and are a prerequisite for a precise ratio cross section measurement. Available anisotropy data is sparse, especially at neutron energies above 5 MeV. For the first time, a three-dimensional tracking detector is employed to study fragment emission angles and provide a direct measurement of angular anisotropy. The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration has deployed the fission time projection chamber (fissionTPC) to measure nuclear data with unprecedented precision. The fission fragment anisotropy of $^{235}$U has been measured over a wide range of incident neutron energies from 180 keV to 200 MeV; a careful study of the systematic uncertainties complement the data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.00973v2-abstract-full').style.display = 'none'; document.getElementById('1710.00973v2-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> 15 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 October, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">10 pages, 12 figures, accepted to Physical Review C</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 99, 064619 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1610.06083">arXiv:1610.06083</a> <span> [<a href="https://arxiv.org/pdf/1610.06083">pdf</a>, <a href="https://arxiv.org/format/1610.06083">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="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.physletb.2017.01.026">10.1016/j.physletb.2017.01.026 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A novel comparison of M酶ller and Compton electron-beam polarimeters </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Magee%2C+J+A">J. A. Magee</a>, <a href="/search/?searchtype=author&query=Narayan%2C+A">A. Narayan</a>, <a href="/search/?searchtype=author&query=Jones%2C+D">D. Jones</a>, <a href="/search/?searchtype=author&query=Beminiwattha%2C+R">R. Beminiwattha</a>, <a href="/search/?searchtype=author&query=Cornejo%2C+J+C">J. C. Cornejo</a>, <a href="/search/?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/?searchtype=author&query=Deconinck%2C+W">W. Deconinck</a>, <a href="/search/?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/?searchtype=author&query=Martin%2C+J+W">J. W. Martin</a>, <a href="/search/?searchtype=author&query=Paschke%2C+K+D">K. D. Paschke</a>, <a href="/search/?searchtype=author&query=Tvaskis%2C+V">V. Tvaskis</a>, <a href="/search/?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/?searchtype=author&query=Benesch%2C+J">J. Benesch</a>, <a href="/search/?searchtype=author&query=Cates%2C+G">G. Cates</a>, <a href="/search/?searchtype=author&query=Cavness%2C+B+S">B. S. Cavness</a>, <a href="/search/?searchtype=author&query=Dillon-Townes%2C+L+A">L. A. Dillon-Townes</a>, <a href="/search/?searchtype=author&query=Hays%2C+G">G. Hays</a>, <a href="/search/?searchtype=author&query=Hoskins%2C+J">J. Hoskins</a>, <a href="/search/?searchtype=author&query=Ihloff%2C+E">E. Ihloff</a>, <a href="/search/?searchtype=author&query=Jones%2C+R">R. Jones</a>, <a href="/search/?searchtype=author&query=King%2C+P+M">P. M. King</a>, <a href="/search/?searchtype=author&query=Kowalski%2C+S">S. Kowalski</a>, <a href="/search/?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/?searchtype=author&query=Lee%2C+L">L. Lee</a> , et al. (16 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="1610.06083v2-abstract-short" style="display: inline;"> We have performed a novel comparison between electron-beam polarimeters based on M酶ller and Compton scattering. A sequence of electron-beam polarization measurements were performed at low beam currents ($<$ 5 $渭$A) during the $Q_{\rm weak}$ experiment in Hall C at Jefferson Lab. These low current measurements were bracketed by the regular high current (180 $渭$A) operation of the Compton polarimete… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.06083v2-abstract-full').style.display = 'inline'; document.getElementById('1610.06083v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1610.06083v2-abstract-full" style="display: none;"> We have performed a novel comparison between electron-beam polarimeters based on M酶ller and Compton scattering. A sequence of electron-beam polarization measurements were performed at low beam currents ($<$ 5 $渭$A) during the $Q_{\rm weak}$ experiment in Hall C at Jefferson Lab. These low current measurements were bracketed by the regular high current (180 $渭$A) operation of the Compton polarimeter. All measurements were found to be consistent within experimental uncertainties of 1% or less, demonstrating that electron polarization does not depend significantly on the beam current. This result lends confidence to the common practice of applying M酶ller measurements made at low beam currents to physics experiments performed at higher beam currents. The agreement between two polarimetry techniques based on independent physical processes sets an important benchmark for future precision asymmetry measurements that require sub-1% precision in polarimetry. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.06083v2-abstract-full').style.display = 'none'; document.getElementById('1610.06083v2-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> 25 January, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2016. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1409.7100">arXiv:1409.7100</a> <span> [<a href="https://arxiv.org/pdf/1409.7100">pdf</a>, <a href="https://arxiv.org/format/1409.7100">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="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> </div> </div> <p class="title is-5 mathjax"> The Q_weak Experimental Apparatus </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Qweak+Collaboration"> Qweak Collaboration</a>, <a href="/search/?searchtype=author&query=Allison%2C+T">T. Allison</a>, <a href="/search/?searchtype=author&query=Anderson%2C+M">M. Anderson</a>, <a href="/search/?searchtype=author&query=Androic%2C+D">D. Androic</a>, <a href="/search/?searchtype=author&query=Armstrong%2C+D+S">D. S. Armstrong</a>, <a href="/search/?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/?searchtype=author&query=Averett%2C+T+D">T. D. Averett</a>, <a href="/search/?searchtype=author&query=Averill%2C+R">R. Averill</a>, <a href="/search/?searchtype=author&query=Balewski%2C+J">J. Balewski</a>, <a href="/search/?searchtype=author&query=Beaufait%2C+J">J. Beaufait</a>, <a href="/search/?searchtype=author&query=Beminiwattha%2C+R+S">R. S. Beminiwattha</a>, <a href="/search/?searchtype=author&query=Benesch%2C+J">J. Benesch</a>, <a href="/search/?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/?searchtype=author&query=Bessuille%2C+J">J. Bessuille</a>, <a href="/search/?searchtype=author&query=Birchall%2C+J">J. Birchall</a>, <a href="/search/?searchtype=author&query=Bonnell%2C+E">E. Bonnell</a>, <a href="/search/?searchtype=author&query=Bowman%2C+J">J. Bowman</a>, <a href="/search/?searchtype=author&query=Brindza%2C+P">P. Brindza</a>, <a href="/search/?searchtype=author&query=Brown%2C+D+B">D. B. Brown</a>, <a href="/search/?searchtype=author&query=Carlini%2C+R+D">R. D. Carlini</a>, <a href="/search/?searchtype=author&query=Cates%2C+G+D">G. D. Cates</a>, <a href="/search/?searchtype=author&query=Cavness%2C+B">B. Cavness</a>, <a href="/search/?searchtype=author&query=Clark%2C+G">G. Clark</a>, <a href="/search/?searchtype=author&query=Cornejo%2C+J+C">J. C. Cornejo</a>, <a href="/search/?searchtype=author&query=Dusa%2C+S+C">S. Covrig Dusa</a> , et al. (104 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="1409.7100v2-abstract-short" style="display: inline;"> The Jefferson Lab Q_weak experiment determined the weak charge of the proton by measuring the parity-violating elastic scattering asymmetry of longitudinally polarized electrons from an unpolarized liquid hydrogen target at small momentum transfer. A custom apparatus was designed for this experiment to meet the technical challenges presented by the smallest and most precise ${\vec{e}}$p asymmetry… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.7100v2-abstract-full').style.display = 'inline'; document.getElementById('1409.7100v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1409.7100v2-abstract-full" style="display: none;"> The Jefferson Lab Q_weak experiment determined the weak charge of the proton by measuring the parity-violating elastic scattering asymmetry of longitudinally polarized electrons from an unpolarized liquid hydrogen target at small momentum transfer. A custom apparatus was designed for this experiment to meet the technical challenges presented by the smallest and most precise ${\vec{e}}$p asymmetry ever measured. Technical milestones were achieved at Jefferson Lab in target power, beam current, beam helicity reversal rate, polarimetry, detected rates, and control of helicity-correlated beam properties. The experiment employed 180 microA of 89% longitudinally polarized electrons whose helicity was reversed 960 times per second. The electrons were accelerated to 1.16 GeV and directed to a beamline with extensive instrumentation to measure helicity-correlated beam properties that can induce false asymmetries. Moller and Compton polarimetry were used to measure the electron beam polarization to better than 1%. The electron beam was incident on a 34.4 cm liquid hydrogen target. After passing through a triple collimator system, scattered electrons between 5.8 degrees and 11.6 degrees were bent in the toroidal magnetic field of a resistive copper-coil magnet. The electrons inside this acceptance were focused onto eight fused silica Cerenkov detectors arrayed symmetrically around the beam axis. A total scattered electron rate of about 7 GHz was incident on the detector array. The detectors were read out in integrating mode by custom-built low-noise pre-amplifiers and 18-bit sampling ADC modules. The momentum transfer Q^2 = 0.025 GeV^2 was determined using dedicated low-current (~100 pA) measurements with a set of drift chambers before (and a set of drift chambers and trigger scintillation counters after) the toroidal magnet. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.7100v2-abstract-full').style.display = 'none'; document.getElementById('1409.7100v2-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 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 September, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">48 pages, 36 figures. Accepted by Nuclear Instruments and Methods A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLab-PHY-14-1959 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1311.6437">arXiv:1311.6437</a> <span> [<a href="https://arxiv.org/pdf/1311.6437">pdf</a>, <a href="https://arxiv.org/format/1311.6437">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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/10.1051/epjconf/20146605002">10.1051/epjconf/20146605002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Early Results from the Qweak Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Androic%2C+D">D. Androic</a>, <a href="/search/?searchtype=author&query=Armstrong%2C+D+S">D. S. Armstrong</a>, <a href="/search/?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/?searchtype=author&query=Averett%2C+T">T. Averett</a>, <a href="/search/?searchtype=author&query=Balewski%2C+J">J. Balewski</a>, <a href="/search/?searchtype=author&query=Beaufait%2C+J">J. Beaufait</a>, <a href="/search/?searchtype=author&query=Beminiwattha%2C+R+S">R. S. Beminiwattha</a>, <a href="/search/?searchtype=author&query=Benesch%2C+J">J. Benesch</a>, <a href="/search/?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/?searchtype=author&query=Birchall%2C+J">J. Birchall</a>, <a href="/search/?searchtype=author&query=Carlini%2C+R+D">R. D. Carlini</a>, <a href="/search/?searchtype=author&query=Cates%2C+G+D">G. D. Cates</a>, <a href="/search/?searchtype=author&query=Cornejo%2C+J+C">J. C. Cornejo</a>, <a href="/search/?searchtype=author&query=Covrig%2C+S">S. Covrig</a>, <a href="/search/?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/?searchtype=author&query=Davis%2C+C+A">C. A. Davis</a>, <a href="/search/?searchtype=author&query=Deconinck%2C+W">W. Deconinck</a>, <a href="/search/?searchtype=author&query=Diefenbach%2C+J">J. Diefenbach</a>, <a href="/search/?searchtype=author&query=Dowd%2C+J+F">J. F. Dowd</a>, <a href="/search/?searchtype=author&query=Dunne%2C+J+A">J. A. Dunne</a>, <a href="/search/?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/?searchtype=author&query=Duvall%2C+W+S">W. S. Duvall</a>, <a href="/search/?searchtype=author&query=Elaasar%2C+M">M. Elaasar</a>, <a href="/search/?searchtype=author&query=Falk%2C+W+R">W. R. Falk</a>, <a href="/search/?searchtype=author&query=Finn%2C+J+M">J. M. Finn</a> , et al. (72 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="1311.6437v1-abstract-short" style="display: inline;"> A subset of results from the recently completed Jefferson Lab Qweak experiment are reported. This experiment, sensitive to physics beyond the Standard Model, exploits the small parity-violating asymmetry in elastic ep scattering to provide the first determination of the protons weak charge Qweak(p). The experiment employed a 180 uA longitudinally polarized 1.16 GeV electron beam on a 35 cm long li… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1311.6437v1-abstract-full').style.display = 'inline'; document.getElementById('1311.6437v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1311.6437v1-abstract-full" style="display: none;"> A subset of results from the recently completed Jefferson Lab Qweak experiment are reported. This experiment, sensitive to physics beyond the Standard Model, exploits the small parity-violating asymmetry in elastic ep scattering to provide the first determination of the protons weak charge Qweak(p). The experiment employed a 180 uA longitudinally polarized 1.16 GeV electron beam on a 35 cm long liquid hydrogen target. Scattered electrons corresponding to Q2 of 0.025 GeV2 were detected in eight Cerenkov detectors arrayed symmetrically around the beam axis. The goals of the experiment were to provide a measure of Qweak(p) to 4.2 percent (combined statistical and systematic error), which implies a measure of sin2(thetaw) at the level of 0.3 percent, and to help constrain the vector weak quark charges C1u and C1d. The experimental method is described, with particular focus on the challenges associated with the worlds highest power LH2 target. The new constraints on C1u and C1d provided by the subset of the experiments data analyzed to date will also be shown, together with the extracted weak charge of the neutron. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1311.6437v1-abstract-full').style.display = 'none'; document.getElementById('1311.6437v1-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> 25 November, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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, 4 figures, INPC2013</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1307.5275">arXiv:1307.5275</a> <span> [<a href="https://arxiv.org/pdf/1307.5275">pdf</a>, <a href="https://arxiv.org/ps/1307.5275">ps</a>, <a href="https://arxiv.org/format/1307.5275">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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/10.1103/PhysRevLett.111.141803">10.1103/PhysRevLett.111.141803 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First Determination of the Weak Charge of the Proton </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/?searchtype=author&query=Qweak+Collaboration"> Qweak Collaboration</a>, <a href="/search/?searchtype=author&query=Androic%2C+D">D. Androic</a>, <a href="/search/?searchtype=author&query=Armstrong%2C+D+S">D. S. Armstrong</a>, <a href="/search/?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/?searchtype=author&query=Averett%2C+T">T. Averett</a>, <a href="/search/?searchtype=author&query=Balewski%2C+J">J. Balewski</a>, <a href="/search/?searchtype=author&query=Beaufait%2C+J">J. Beaufait</a>, <a href="/search/?searchtype=author&query=Beminiwattha%2C+R+S">R. S. Beminiwattha</a>, <a href="/search/?searchtype=author&query=Benesch%2C+J">J. Benesch</a>, <a href="/search/?searchtype=author&query=Benmokhtar%2C+F">F. Benmokhtar</a>, <a href="/search/?searchtype=author&query=Birchall%2C+J">J. Birchall</a>, <a href="/search/?searchtype=author&query=Carlini%2C+R+D">R. D. Carlini</a>, <a href="/search/?searchtype=author&query=Cates%2C+G+D">G. D. Cates</a>, <a href="/search/?searchtype=author&query=Cornejo%2C+J+C">J. C. Cornejo</a>, <a href="/search/?searchtype=author&query=Covrig%2C+S">S. Covrig</a>, <a href="/search/?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/?searchtype=author&query=Davis%2C+C+A">C. A. Davis</a>, <a href="/search/?searchtype=author&query=Deconinck%2C+W">W. Deconinck</a>, <a href="/search/?searchtype=author&query=Diefenbach%2C+J">J. Diefenbach</a>, <a href="/search/?searchtype=author&query=Dowd%2C+J+F">J. F. Dowd</a>, <a href="/search/?searchtype=author&query=Dunne%2C+J+A">J. A. Dunne</a>, <a href="/search/?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/?searchtype=author&query=Duvall%2C+W+S">W. S. Duvall</a>, <a href="/search/?searchtype=author&query=Elaasar%2C+M">M. Elaasar</a>, <a href="/search/?searchtype=author&query=Falk%2C+W+R">W. R. Falk</a> , et al. (73 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="1307.5275v2-abstract-short" style="display: inline;"> The Qweak experiment has measured the parity-violating asymmetry in polarized e-p elastic scattering at Q^2 = 0.025(GeV/c)^2, employing 145 microamps of 89% longitudinally polarized electrons on a 34.4cm long liquid hydrogen target at Jefferson Lab. The results of the experiment's commissioning run are reported here, constituting approximately 4% of the data collected in the experiment. From these… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1307.5275v2-abstract-full').style.display = 'inline'; document.getElementById('1307.5275v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1307.5275v2-abstract-full" style="display: none;"> The Qweak experiment has measured the parity-violating asymmetry in polarized e-p elastic scattering at Q^2 = 0.025(GeV/c)^2, employing 145 microamps of 89% longitudinally polarized electrons on a 34.4cm long liquid hydrogen target at Jefferson Lab. The results of the experiment's commissioning run are reported here, constituting approximately 4% of the data collected in the experiment. From these initial results the measured asymmetry is Aep = -279 +- 35 (statistics) +- 31 (systematics) ppb, which is the smallest and most precise asymmetry ever measured in polarized e-p scattering. The small Q^2 of this experiment has made possible the first determination of the weak charge of the proton, QpW, by incorporating earlier parity-violating electron scattering (PVES) data at higher Q^2 to constrain hadronic corrections. The value of QpW obtained in this way is QpW(PVES) = 0.064 +- 0.012, in good agreement with the Standard Model prediction of QpW(SM) = 0.0710 +- 0.0007. When this result is further combined with the Cs atomic parity violation (APV) measurement, significant constraints on the weak charges of the up and down quarks can also be extracted. That PVES+APV analysis reveals the neutron's weak charge to be QnW(PVES+APV) = -0.975 +- 0.010. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1307.5275v2-abstract-full').style.display = 'none'; document.getElementById('1307.5275v2-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> 2 September, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 July, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">7 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-13-1756 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 111, 141803 (2013) </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> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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