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Your search keyword '"Meierbachtol A"' showing total 22 results
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22 results on '"Meierbachtol A"'

1. A multi-Physics Experiment for Low-Yield Nuclear Explosion Monitoring

Author

Myers, S, primary, Abbott, G, additional, Alexander, T, additional, Alger, E, additional, Alvarez, A, additional, Annabelle, N, additional, Antoun, T, additional, Auld, G, additional, Malach, A, additional, Banuelos, H, additional, Barela, M, additional, Barnhart, T, additional, Barrow, P, additional, Bartlett, T, additional, Bockman, A, additional, Bodmer, M, additional, Bogolub, K, additional, Bonner, J, additional, Borden, R, additional, Boukhalfa, H, additional, Bowman, D, additional, Britt, C, additional, Broman, B, additional, Broome, S, additional, Brown, B, additional, Burghardt, J, additional, Chester, D, additional, Choens, C, additional, Chojnicki, K, additional, Churby, A, additional, Cole, J, additional, Coleman, T, additional, Collard, J, additional, Couture, A, additional, Crosby, G, additional, Cruz-Cabrera, A, additional, D'Saint Angelo, D, additional, Dea, M, additional, Dekin, W, additional, DeVisser, B, additional, Dietel, M, additional, Downs, C, additional, Downs, N, additional, Dzenitis, E, additional, Eckert, E, additional, Eras, S, additional, Euler, G, additional, Ezzedine, S, additional, Fast, J, additional, Feldman, J, additional, Featherston, K, additional, Foxe, M, additional, Freimuth, C, additional, Fritz, B, additional, Galvin, G, additional, Gamboa, S, additional, Garner, L, additional, Gascoigne, T, additional, Gastelum, J, additional, Gaylord, J, additional, Gessey, D, additional, Glasgow, B, additional, Glavin, G, additional, Glomski, A, additional, Goodwin, M, additional, Green, D, additional, Griego, J, additional, Grover, S, additional, Gutierrez, J, additional, Haas, D, additional, Hall, R, additional, Hall, A, additional, Hardy, D, additional, Hauk, D, additional, Heath, J, additional, Holand, A, additional, Holdcroft, J, additional, Holland, A, additional, Honjas, W, additional, Howard, K, additional, Hudson, C, additional, Ingraham, M, additional, Jaramillo, J, additional, Jenkins, A, additional, Johnson, C, additional, Jones, K, additional, Falliner, F, additional, Junor, W, additional, Keillor, M, additional, Kent, G, additional, Keogh, M, additional, Kibikas, W, additional, Kleadbeater, K, additional, Knox, H, additional, Knox, J, additional, Kuhlman, K, additional, Kwiatkowski, C, additional, Laintz, K, additional, Lapka, J, additional, Larotonda, J, additional, Layne, J, additional, Ledoux, N, additional, Li, S, additional, Linneman, D, additional, Lipkowitz, P, additional, MacLeod, G, additional, McCann, E, additional, McCombe, R, additional, Meierbachtol, C, additional, Mellors, R, additional, Memmott, B, additional, Mendenhall, W, additional, Mendez, J, additional, Miller, X, additional, Miller, A, additional, Miranda, F, additional, Montano, M, additional, Moore, M, additional, Morris, J, additional, Munley, W, additional, Murillo, E, additional, Myers, T, additional, Navarro, A, additional, Nippress, S, additional, Otto, S, additional, Peacock, S, additional, Pemberton, S, additional, Perea, R, additional, Peterson, J, additional, Pierre-Yves, L, additional, Plank, G, additional, Podrasky, A, additional, Podrasky, D, additional, Pope, J, additional, Poskey, M, additional, Powell, M, additional, Price, A, additional, Puyleart, A, additional, Quintana, B, additional, Rahn, T, additional, Rendon, C, additional, Reppart, J, additional, Rico, H, additional, Roberts, B, additional, Robey, E, additional, Rodd, R, additional, Rodriguez, M, additional, Rogall, A, additional, Romanczuk, A, additional, Roth, M, additional, Salyer, G, additional, Savran, B, additional, Schalk, W, additional, Seifert, C, additional, Seitz, D, additional, Shao, X, additional, Sirota, D, additional, Slack, J, additional, Slater, D, additional, Smith, K, additional, Smith, D, additional, Spears, B, additional, Sprinkle, D, additional, Stead, R, additional, Stephens, M, additional, Strickland, C, additional, Tafoya, A, additional, Tafoya, J, additional, Tagoe, M, additional, Taguba, C, additional, Tarnecki, L, additional, Tatge, R, additional, Teich-McGoldrick, S, additional, Terry, B, additional, Thompson, R, additional, Townsend, M, additional, Tubbs, G, additional, Turley, R, additional, Valdez, N, additional, Van Morris, A, additional, Vergara, S, additional, Vigil, J, additional, Villanueva, J, additional, Vorobiev, O, additional, Wallace, D, additional, Walrath, T, additional, Wharton, S, additional, White, R, additional, White, H, additional, Whitehill, A, additional, Williams, M, additional, Wilson, J, additional, Wood, L, additional, Wright, C, additional, Wright, A, additional, Xu, G, additional, Yang, X, additional, Yost, R, additional, and Zeiler, C, additional

Published
2024
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2. Greenland and Canadian Arctic Ice Temperature Profiles Database

Author

Anja Løkkegaard, Kenneth D. Mankoff, Christian Zdanowicz, Gary D. Clow, Martin P. Lüthi, Samuel H. Doyle, Henrik H. Thomsen, David Fisher, Joel Harper, Andy Aschwanden, Bo M. Vinther, Dorthe Dahl-Jensen, Harry Zekollari, Toby Meierbachtol, Ian McDowell, Neil Humphrey, Anne Solgaard, Nanna B. Karlsson, Shfaqat A. Khan, Benjamin Hills, Robert Law, Bryn Hubbard, Poul Christoffersen, Mylène Jacquemart, Julien Seguinot, Robert S. Fausto, and William T. Colgan

Subjects
Meteorology and Climatology
Abstract

Here, we present a compilation of 95 ice temperature profiles from 85 boreholes from the Greenland ice sheet and peripheral ice caps, as well as local ice caps in the Canadian Arctic. Profiles from only 31 boreholes (36 %) were previously available in open-access data repositories. The remaining 54 borehole profiles (64 %) are being made digitally available here for the first time. These newly available profiles, which are associated with pre-2010 boreholes, have been submitted by community members or digitized from published graphics and/or data tables. All 95 profiles are now made available in both absolute (meters) and normalized (0 to 1 ice thickness) depth scales and are accompanied by extensive metadata. These metadata include a transparent description of data provenance. The ice temperature profiles span 70 years, with the earliest profile being from 1950 at Camp VI, West Greenland. To highlight the value of this database in evaluating ice flow simulations, we compare the ice temperature profiles from the Greenland ice sheet with an ice flow simulation by the Parallel Ice Sheet Model (PISM). We find a cold bias in modeled near-surface ice temperatures within the ablation area, a warm bias in modeled basal ice temperatures at inland cold-bedded sites, and an apparent underestimation of deformational heating in high-strain settings. These biases provide process level insight on simulated ice temperatures.

Published
2023
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3. Correlated Prompt Fission Data in Transport Simulations

Author

Talou, P., Vogt, R., Randrup, J., Rising, M. E., Pozzi, S. A., Verbeke, J., Andrews, M. T., Clarke, S. D., Jaffke, P., Jandel, M., Kawano, T., Marcath, M. J., Meierbachtol, K., Nakae, L., Rusev, G., Sood, A., Stetcu, I., and Walker, C.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Detailed information on the fission process can be inferred from the observation, modeling and theoretical understanding of prompt fission neutron and $\gamma$-ray~observables. Beyond simple average quantities, the study of distributions and correlations in prompt data, e.g., multiplicity-dependent neutron and \gray~spectra, angular distributions of the emitted particles, $n$-$n$, $n$-$\gamma$, and $\gamma$-$\gamma$~correlations, can place stringent constraints on fission models and parameters that would otherwise be free to be tuned separately to represent individual fission observables. The FREYA~and CGMF~codes have been developed to follow the sequential emissions of prompt neutrons and $\gamma$-rays~from the initial excited fission fragments produced right after scission. Both codes implement Monte Carlo techniques to sample initial fission fragment configurations in mass, charge and kinetic energy and sample probabilities of neutron and $\gamma$~emission at each stage of the decay. This approach naturally leads to using simple but powerful statistical techniques to infer distributions and correlations among many observables and model parameters. The comparison of model calculations with experimental data provides a rich arena for testing various nuclear physics models such as those related to the nuclear structure and level densities of neutron-rich nuclei, the $\gamma$-ray~strength functions of dipole and quadrupole transitions, the mechanism for dividing the excitation energy between the two nascent fragments near scission, and the mechanisms behind the production of angular momentum in the fragments, etc. Beyond the obvious interest from a fundamental physics point of view, such studies are also important for addressing data needs in various nuclear applications. (See text for full abstract.), Comment: 39 pages, 57 figure files, published in Eur. Phys. J. A, reference added this version

Published
2017
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4. Elastic breakup cross sections of well-bound nucleons

Author

Wimmer, K., Bazin, D., Gade, A., Tostevin, J. A., Baugher, T., Chajecki, Z., Coupland, D., Famiano, M. A., Ghosh, T. K., Howard, G. F. Grinyer M. E., Kilburn, M., Lynch, W. G., Manning, B., Meierbachtol, K., Quarterman, P., Ratkiewicz, A., Sanetullaev, A., Showalter, R. H., Stroberg, S. R., Tsang, M. B., Weisshaar, D., Winkelbauer, J., Winkler, R., and Youngs, M.

Subjects
Nuclear Experiment
Abstract

The 9Be(28Mg,27Na) one-proton removal reaction with a large proton separation energy of Sp(28Mg)=16.79 MeV is studied at intermediate beam energy. Coincidences of the bound 27Na residues with protons and other light charged particles are measured. These data are analyzed to determine the percentage contributions to the proton removal cross section from the elastic and inelastic nucleon removal mechanisms. These deduced contributions are compared with the eikonal reaction model predictions and with the previously measured data for reactions involving the re- moval of more weakly-bound protons from lighter nuclei. The role of transitions of the proton between different bound single-particle configurations upon the elastic breakup cross section is also quantified in this well-bound case. The measured and calculated elastic breakup fractions are found to be in good agreement., Comment: Phys. Rev. C 2014 (accepted)

Published
2014
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5. Development of position-sensitive time-of-flight spectrometer for fission fragment research

Author

Arnold, C. W., Tovesson, F., Meierbachtol, K., Bredeweg, T., Jandel, M., Jorgenson, H. J., Laptev, A., Rusev, G., Shields, D. W., White, M., Blakeley, R. E., Mader, D. M., and Hecht, A. A.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

A position-sensitive, high-resolution time-of-flight detector for fission fragments has been developed. The SPectrometer for Ion DEterminiation in fission Research (SPIDER) is a $2E-2v$ spectrometer designed to measure the mass of light fission fragments to a single mass unit. The time pick-off detector pairs to be used in SPIDER have been tested with $\alpha$-particles from $^{229}$Th and its decay chain and $\alpha$-particles and spontaneous fission fragments from $^{252}$Cf. Each detector module is comprised of a thin electron conversion foil, electrostatic mirror, microchannel plates, and delay-line anodes. Particle trajectories on the order of 700 mm are determined accurately to within 0.7 mm. Flight times on the order of 70 ns were measured with 200 ps resolution FWHM. Computed particle velocities are accurate to within 0.06 mm/ns corresponding to precision of 0.5%. An ionization chamber capable of 400 keV energy resolution coupled with the velocity measurements described here will pave the way for modestly efficient measurements of light fission fragments with unit mass resolution., Comment: 15 pages 6 figures

Published
2014
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6. Correlations in intermediate-energy two-proton removal reactions

Author

Wimmer, K., Bazin, D., Gade, A., Tostevin, J. A., Baugher, T., Chajecki, Z., Coupland, D., Famiano, M. A., Ghosh, T. K., Grinyer, G. F., Hodges, R., Howard, M. E., Kilburn, M., Lynch, W. G., Manning, B., Meierbachtol, K., Quarterman, P., Ratkiewicz, A., Sanetullaev, A., Simpson, E. C., Stroberg, S. R., Tsang, M. B., Weisshaar, D., Winkelbauer, J., Winkler, R., and Youngs, M.

Subjects
Nuclear Experiment
Abstract

We report final-state-exclusive measurements of the light charged fragments in coincidence with 26Ne residual nuclei following the direct two-proton removal from a neutron-rich 28Mg secondary beam. A Dalitz-plot analysis and comparisons with simulations show that a majority of the triple- coincidence events with two protons display phase-space correlations consistent with the (two-body) kinematics of a spatially-correlated pair-removal mechanism. The fraction of such correlated events, 56(12) %, is consistent with the fraction of the calculated cross section, 64 %, arising from spin S = 0 two-proton configurations in the entrance-channel (shell-model) 28Mg ground state wave function. This result promises access to an additional and more specific probe of the spin and spatial correlations of valence nucleon pairs in exotic nuclei produced as fast secondary beams., Comment: accepted for publication in Physical Review Letters

Published
2012
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7. Probing elastic and inelastic breakup contributions to intermediate-energy two-proton removal reactions

Author

Wimmer, K., Bazin, D., Gade, A., Tostevin, J. A., Baugher, T., Chajecki, Z., Coupland, D., Famiano, M. A., Ghosh, T. K., Grinyer, G. F., Hodges, R., Howard, M. E., Kilburn, M., Lynch, W. G., Manning, B., Meierbachtol, K., Quarterman, P., Ratkiewicz, A., Sanetullaev, A., Stroberg, S. R., Tsang, M. B., Weisshaar, D., Winkelbauer, J., and Youngs, R. Winkler M.

Subjects
Nuclear Experiment
Abstract

The two-proton removal reaction from 28Mg projectiles has been studied at 93 MeV/u at the NSCL. First coincidence measurements of the heavy 26Ne projectile residues, the removed protons and other light charged particles enabled the relative cross sections from each of the three possible elastic and inelastic proton removal mechanisms to be determined. These more final-state-exclusive measurements are key for further interrogation of these reaction mechanisms and use of the reaction channel for quantitative spectroscopy of very neutron-rich nuclei. The relative and absolute yields of the three contributing mechanisms are compared to reaction model expectations - based on the use of eikonal dynamics and sd-shell-model structure amplitudes., Comment: Accepted for publication in Physical Review C (Rapid Communication)

Published
2012
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8. Inverse-kinematics one-neutron pickup with fast rare-isotope beams

Author

Gade, A., Tostevin, J. A., Baugher, T., Bazin, D., Brown, B. A., Campbell, C. M., Glasmacher, T., Grinyer, G. F., McDaniel, S., Meierbachtol, K., Ratkiewicz, A., Stroberg, S. R., Walsh, K. A., Weisshaar, D., and Winkler, R.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

New measurements and reaction model calculations are reported for single neutron pickup reactions onto a fast \nuc{22}{Mg} secondary beam at 84 MeV per nucleon. Measurements were made on both carbon and beryllium targets, having very different structures, allowing a first investigation of the likely nature of the pickup reaction mechanism. The measurements involve thick reaction targets and $\gamma$-ray spectroscopy of the projectile-like reaction residue for final-state resolution, that permit experiments with low incident beam rates compared to traditional low-energy transfer reactions. From measured longitudinal momentum distributions we show that the $\nuc{12}{C} (\nuc{22}{Mg},\nuc{23}{Mg}+\gamma)X$ reaction largely proceeds as a direct two-body reaction, the neutron transfer producing bound \nuc{11}{C} target residues. The corresponding reaction on the \nuc{9}{Be} target seems to largely leave the \nuc{8}{Be} residual nucleus unbound at excitation energies high in the continuum. We discuss the possible use of such fast-beam one-neutron pickup reactions to track single-particle strength in exotic nuclei, and also their expected sensitivity to neutron high-$\ell$ (intruder) states which are often direct indicators of shell evolution and the disappearance of magic numbers in the exotic regime., Comment: 8 pages, 5 figures

Published
2011
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9. Vessels Irradiation Experimental Campaign

Author

McClanahan, Tucker, primary, Marcath, Matthew, additional, Mayo, Douglas, additional, Meierbachtol, Krista, additional, Klain, Kimberly, additional, Gonzales, Samuel, additional, Engeman, Scott, additional, and Mclean, Thomas, additional

Published
2021
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20. TPC measurement support

Author

Meharchand, Rhiannon T., primary, Tovesson, Fredrik K., additional, Laptev, Alexander B., additional, and Meierbachtol, Krista C., additional

Published
2012
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