C. D. Roper

Design of High Current Modulating Particle Accelerator System in a Background Space Plasma

C. D. Roper, Q.R. Marksteiner, D.T. Beckman, R. L. Hemphill et autres

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Design of a Modulating-Anode Particle Accelerator for Space-Based Experiments

C. D. Roper, Quinn R. Marksteiner, John W. Lewellen IV, G. D. Reeves

This research aims to enhance the performance of a mod-anode electron gun for future space-based experiments, specifically for Beam2PIE, an advanced particle accelerator designed to investigate beam-plasma interactions and their role in wave generation in space physics. Traditional electron guns rely on …

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Improved Results for the 2H(d, n)3He Transverse Vector Polarization-Transfer Coefficient $${K^{y'}_{y}(0^{\circ})}$$ at Low Energies

C. D. Roper, T.B. Clegg, J. D. Dunham, A. J. Mendez et autres

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Guiding Students As They Learn to Lead

C. D. Roper

Measurement of the neutron-neutron scattering length using the π−d capture reaction

Qiafeng Chen, Calvin R Howell, T. S. Carman, W. R. Gibbs et autres

We have determined a value for the ${}^{1}{S}_{0}$ neutron-neutron scattering length (${a}_{\mathit{nn}}$) from high-precision measurements of time-of-flight spectra of neutrons from the $^{2}\mathrm{H}$$({\ensuremath{\pi}}^{\ensuremath{-}},n \ensuremath{\gamma}) n$ capture reaction. The measurements were done at the Los Alamos Meson Physics Facility by the E1286 Collaboration. …

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Neutron–proton analyzing power at 12 MeV and inconsistencies in parametrizations of nucleon–nucleon data

R. T. Braun, W. Tornow, Calvin R Howell, D. E. González Trotter et autres

We present the most accurate and complete data set for the analyzing power Ay(θ) in neutron–proton scattering. The experimental data were corrected for the effects of multiple scattering, both in the center detector and in the neutron detectors. The final data at …

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Neutron-deuteron breakup experiment at En=13MeV : Determination of the 1S0 neutron-neutron scattering length ann

D. E. González Trotter, F. Salinas Meneses, W. Tornow, Calvin R Howell et autres

We report on results of a kinematically complete neutron-deuteron breakup experiment performed at Triangle Universities Nuclear Laboratory using an ${E}_{n}=13$ MeV incident neutron beam. The ${}^{1}{S}_{0}$ neutron-neutron scattering length ${a}_{\mathit{nn}}$ has been determined for four production angles of the neutron-neutron final-state interaction …

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Measurements of Ay(θ) for C12 (n,n) C12 from En=2.2 to 8.5 MeV

C. D. Roper, W. Tornow, R. T. Braun, Qiafeng Chen et autres

The analyzing power ${A}_{y}(\ensuremath{\theta})$ for neutron elastic scattering from $^{12}\mathrm{C}$ has been measured for 33 neutron energies between ${E}_{n}=2.2$ and 8.5 MeV in the angular range from 25${}^{\ifmmode^\circ\else\textdegree\fi{}}$ to 145${}^{\ifmmode^\circ\else\textdegree\fi{}}$ in the laboratory system. The primary motivation for these measurements is the …

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Cross-section measurements of neutron-deuteron breakup at 13.0 MeV

H. R. Setze, Calvin R Howell, W. Tornow, R. T. Braun et autres

Cross-section measurements of seven exit-channel configurations in the neutron-deuteron breakup at 13.0 MeV are reported and compared to rigorous calculations. Our data are consistent with those of previous measurements in four of six configurations. The present data for five configurations are in …

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Cross-Section Measurements of In-Plane and Out-Of-Plane Configurations in Neutron-Deuteron Breakup at 13.0 MeV

R. S. Pedroni, H. R. Setze, Calvin R Howell, Alexander S Crowell et autres

Recent High-Accuracy Measurements of the 1 S 0 Neutron-Neutron Scattering Length

Calvin R Howell, Qiafeng Chen, D. E. González Trotter, F. Salinas et autres

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New Measurement of the 1 S 0 Neutron-Neutron Scattering Length Using the Neutron-Proton Scattering Length as a Standard

D. E. González Trotter, F. Salinas, Qiafeng Chen, Alexander S Crowell et autres

This paper reports high-accuracy cross-section data taken for identical kinematic conditions of the neutron-proton $(\mathrm{np})$ and neutron-neutron $(\mathrm{nn})$ final-state interactions in the ${}^{2}\mathrm{H}(n,nnp)$ reaction at an incident mean neutron energy of 13.0 MeV. These data were analyzed with rigorous three-nucleon calculations to …

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