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Browsing Physics by Title

Now showing items 90-109 of 123

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    Search for domain wall dark matter with atomic clocks on board global positioning system satellites 

    Roberts, Benjamin M.; Blewitt, Geoffrey; Dailey, Conner B.; Murphy, Mac; Pospelov, Maxim; Rollings, Alex; Sherman, Jeff; Williams, Wyatt; Derevianko, Andrei (2017)
    Cosmological observations indicate that dark matter makes up 85% of all matter in the universe yet its microscopic composition remains a mystery. Dark matter could arise from ultralight quantum fields that form macroscopic ...

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    Self-generated surface magnetic fields inhibit laser-driven sheath acceleration of high-energy protons 

    Nakatsutsumi, M.; Sentoku, Y.; Korzhimanov, A.; Chen, S. N.; Buffechoux, S.; Kon, A.; Atherton, B.; Audebert, P.; Geissel, M.; Hurd, L.; Kimmel, M.; Rambo, P.; Schollmeier, M.; Schwarz, J.; Starodubtsev, M.; Gremillet, L.; Kodama, Ryosuke; Fuchs, J. (2018)
    High-intensity lasers interacting with solid foils produce copious numbers of relativistic electrons, which in turn create strong sheath electric fields around the target. The proton beams accelerated in such fields have ...

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    Sensing short range forces with a nanosphere matter-wave interferometer 

    Geraci, Andrew A.; Goldman, Hart (2015)
    We describe a method for sensing short range forces using matter-wave interference in dielectric nanospheres. When compared with atom interferometers, the larger mass of the nanosphere results in reduced wave-packet ...

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    Sensitivity of Atom Interferometry to Ultralight Scalar Field Dark Matter 

    Geraci, Andrew A.; Derevianko, Andrei (2016)
    We discuss the use of atom interferometry as a tool to search for dark matter (DM) composed of virialized ultralight fields (VULFs). Previous work on VULF DM detection using accelerometers has considered the possibility ...

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    Separating Dipole and Quadrupole Contributions to Single-Photon Double Ionization 

    Grundmann, S.; Trinter, F.; Bray, A. W.; Eckart, S.; Rist, J.; Kastirke, Gregor; Metz, D.; Klumpp, S.; Viefhaus, J.; Schmidt, L. Ph H.; Williams, J. B.; Doerner, Reinhard; Jahnke, Till; Schoeffler, M. S.; Kheifets, A. S. (2018)
    We report on a kinematically complete measurement of double ionization of helium by a single 1100 eV circularly polarized photon. By exploiting dipole selection rules in the two-electron continuum state, we observed the ...

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    Shaped nozzles for cryogenic buffer-gas beam sources 

    Xiao, Di; Lancaster, David M.; Allen, Cameron H.; Taylor, Mckenzie J.; Lancaster, Thomas A.; Shaw, Gage; Hutzler, Nicholas R.; Weinstein, Jonathan D. (2019)
    Cryogenic buffer-gas beams are important sources of cold molecules. In this work we explore the use of a converging-diverging nozzle with a buffer-gas beam. We find that, under appropriate circumstances, the use of a nozzle ...

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    Shell stability and conditions analyzed using a new method of extracting shell areal density maps from spectrally resolved images of direct-drive inertial confinement fusion implosions 

    Johns, Heather M.; Mancini, Roberto C.; Nagayama, Taisuke; Mayes, Daniel C.; Tommasini, R.; Smalyuk, V. A.; Regan, S. P.; Delettrez, J. A. (2016)
    In warm target direct-drive inertial confinement fusion implosion experiments performed at the OMEGA laser facility, plastic micro-balloons doped with a titanium tracer layer in the shell and filled with deuterium gas were ...

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    Single photoionization of the Zn II ion in the photon energy range 17.5-90.0 eV: experiment and theory 

    Hinojosa, G.; Davis, V. T.; Covington, A. M.; Thompson, J. S.; Kilcoyne, A. L. D.; Antillon, A.; Hernandez, E. M.; Calabrese, D.; Morales-Mori, A.; Juarez, A. M.; Windelius, O.; McLaughlin, B. M. (2017)
    Measurements of the single-photoionization cross-section of Cu-like Zn+ ions are reported in the energy (wavelength) range 17.5 eV (708 angstrom) to 90 eV (138 angstrom). The measurements on this trans-Fe element were ...

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    Spatial-temporal variation of low-frequency earthquake bursts near Parkfield, California 

    Wu, Chunquan; Guyer, Robert A.; Shelly, David; Trugman, Daniel; Frank, William; Gomberg, Joan; Johnson, Paul A. (2015)
    Tectonic tremor (TT) and low-frequency earthquakes (LFEs) have been found in the deeper crust of various tectonic environments globally in the last decade. The spatial-temporal behaviour of LFEs provides insight into deep ...

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    Spectral line shapes of L-shell transitions in Ne-like iron 

    Mancini, Roberto C. (2016)
    Photon-energy-resolved large-scale opacity calculations employ Stark broadened spectral line shapes only to account for the contribution of K-shell line transitions. Detailed ion broadening effects are not considered for ...

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    Spin Entanglement Witness for Quantum Gravity 

    Bose, Sougato; Mazumdar, Anupam; Morley, Gavin W.; Ulbricht, Hendrik; Toros, Marko; Paternostro, Mauro; Geraci, Andrew A.; Barker, Peter F.; Kim, M. S.; Milburn, Gerard (2017)
    Understanding gravity in the framework of quantum mechanics is one of the great challenges in modern physics. However, the lack of empirical evidence has lead to a debate on whether gravity is a quantum entity. Despite ...

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    Study of ablation and implosion stages in wire arrays using coupled ultraviolet and X-ray probing diagnostics 

    Anderson, Andrew A.; Ivanov, Vladimir V.; Astanovitskiy, A. L.; Papp, Daniel; Wiewior, P. P.; Chalyy, O. (2015)
    Star and cylindrical wire arrays were studied using laser probing and X-ray radiography at the 1-MA Zebra pulse power generator at the University of Nevada, Reno. The Leopard laser provided backlighting, producing a laser ...

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    Study of fast electron generation using multi beam of LFEX-class laser 

    Hata, Masayasu; Sakagami, H.; Johzaki, Tomoyuki; Sentoku, Y.; Nagatomo, Hideo (2016)
    Fast Ignition Realization Experiment project phase-I (FIREX-I) is being performed at Institute of Laser Engineering, Osaka University. In this project, the four-beam bundled high-energy Petawatt laser (LFEX) is being ...

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    Study of magnetic fields and current in the Z pinch at stagnation 

    Ivanov, Vladimir V.; Anderson, Andrew A.; Papp, Dóra; Astanovitskiy, A. L.; Nalajala, Vidya; Dmitriev, Oleg (2015)
    The structure of magnetic fields in wire-array Z pinches at stagnation was studied using a Faraday rotation diagnostic at the wavelength of 266 nm. The electron plasma density and the Faraday rotation angle in plasma were ...

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    Subtropical Dust Storms and Downslope Wind Events 

    Pokharel, Ashok K.; Kaplan, Michael L.; Fiedler, Stephanie (2017)
    We performed detailed mesoscale observational analyses and Weather Research and Forecasting (WRF) model simulations to study the terrain-induced downslope winds that generated dust-emitting winds at the beginning of three ...

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    Supersonic plasma turbulence in the laboratory 

    White, T. G.; Oliver, M. T.; Mabey, P.; Kuehn-Kauffeldt, M.; Bott, A. F. A.; Dohl, L. N. K.; Bell, A. R.; Bingham, R.; Clarke, R. J.; Foster, J.; Giacinti, G.; Graham, P.; Heathcote, R.; Koenig, M.; Kuramitsu, Y.; Lamb, D. Q.; Meinecke, J.; Michel, Th; Miniati, F.; Notley, M.; Reville, B.; Ryu, D.; Sarkar, S.; Sakawa, Y.; Selwood, M. P.; Squire, J.; Scott, R. H. H.; Tzeferacos, P.; Woolsey, N.; Schekochihin, A. A.; Gregori, G. (2019)
    The properties of supersonic, compressible plasma turbulence determine the behavior of many terrestrial and astrophysical systems. In the interstellar medium and molecular clouds, compressible turbulence plays a vital role ...

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    Systematic Fuel Cavity Asymmetries in Directly Driven Inertial Confinement Fusion Implosions 

    Shah, R. C.; Haines, B. M.; Wysocki, F. J.; Benage, J. F.; Fooks, J. A.; Glebov, V. Y.; Hakel, P.; Hoppe, M.; Igumenshchev, I. V.; Kagan, G.; Mancini, Roberto C.; Marshall, F. J.; Michel, D. T.; Murphy, T. J.; Schoff, M. E.; Silverstein, K.; Stoeckl, C.; Yaakobi, B. (2017)
    We present narrow-band self-emission x-ray images from a titanium tracer layer placed at the fuel-shell interface in 60-laser-beam implosion experiments at the OMEGA facility. The images are acquired during deceleration ...

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    Target Monitoring and Plasma Diagnosis using 2 omega probe beam for CANDY 

    Ishii, Katsuhiro; Mori, Yoshitaka; Hanayama, Ryohei; Nakayama, Suisei; Okihara, Shinichiro; Fujita, Kazuhisa; Sekina, Takashi; Sato, Nakahiro; Kurita, Takashi; Kawashima, Toshiyuki; Kan, Hirofumi; Komeda, Osamu; Nakamura, Naoki; Kondo, Takuya; Fujine, Manabu; Azuma, Hirozumi; Hioki, Tatsumi; Kakeno, Mitsutaka; Motohiro, Tomoyoshi; Nishimura, Yasuhiko; Sunahara, Atsushi; Sentoku, Yasuhiko; Miura, Eisuke; Kitagawa, Yoneyoshi (2016)
    We have developed the shadowgraph and interferometer with second-harmonic of heating pulses laser to observe target and plasma in highly-repetitive fusion reaction experiments. In the deuterated polystyrene ((C8D8) n double ...

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    The concept of transport capacity in geomorphology 

    Wainwright, John; Parsons, Anthony J.; Cooper, James R.; Gao, Peng; Gillies, John A.; Mao, Luca; Orford, Julian D.; Knight, Peter G. (2015)
    The notion of sediment-transport capacity has been engrained in geomorphological and related literature for over 50 years, although its earliest roots date back explicitly to Gilbert in fluvial geomorphology in the 1870s ...

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    The Two-Column Aerosol Project: Phase I-Overview and impact of elevated aerosol layers on aerosol optical depth 

    Berg, Larry K.; Fast, Jerome D.; Barnard, James C.; Burton, Sharon P.; Cairns, Brian; Chand, Duli; Comstock, Jennifer M.; Dunagan, Stephen; Ferrare, Richard A.; Flynn, Connor J.; Hair, Johnathan W.; Hostetler, Chris A.; Hubbe, John; Jefferson, Anne; Johnson, Roy; Kassianov, Evgueni I.; Kluzek, Celine D.; Kollias, Pavlos; Lamer, Katia; Lantz, Kathleen; Mei, Fan; Miller, Mark A.; Michalsky, Joseph; Ortega, Ivan; Pekour, Mikhail; Rogers, Ray R.; Russell, Philip B.; Redemann, Jens; Sedlacek, Arthur J.; Segal-Rosenheimer, Michal; Schmid, Beat; Shilling, John E.; Shinozuka, Yohei; Springston, Stephen R.; Tomlinson, Jason M.; Tyrrell, Megan; Wilson, Jacqueline M.; Volkamer, Rainer; Zelenyuk, Alla; Berkowitz, Carl M. (2016)
    The Two-Column Aerosol Project (TCAP), conducted from June 2012 through June 2013, was a unique study designed to provide a comprehensive data set that can be used to investigate a number of important climate science ...