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The Simplest Double Slit: Interference and Entanglement in Double Photoionization of H2

Description: The wave nature of particles is rarely seen in nature. One reason is their very short de Broglie wavelengths in most situations. However, even with wavelengths close to the size of their surroundings, they couple to their environment, e.g. by gravity, Coulomb interaction, or thermal radiation. These couplings shift the phase of the waves, often in an uncontrolled way, hence yielding varying amounts of decoherence i.e. loss of phase integrity. Decoherence is thought to be a main cause of the transition from quantum to classical behavior. How much interaction is necessary and how big an environment is needed to induce the onset of classical behavior? Here we show that a photoelectron and two protons form a minimum particle/slit system, and that a minimum environment can be no more than a single additional electron. We observe interference 'fringes' in the angular distribution of a single electron and the loss of fringe visibility caused by its Coulomb interaction with a second electron. While, at the same time, the correlated momenta of the entangled electron pair continue to exhibit quantum interference.
Date: September 18, 2007
Creator: Akoury , D.; Kreidi, K.; Jahnke , T.; Weber, Th.; Staudte , A.; Schoffler, M. et al.
Partner: UNT Libraries Government Documents Department

Air Activation Following an Atmospheric Explosion

Description: In addition to thermal radiation and fission products, nuclear explosions result in a very high flux of unfissioned neutrons. Within an atmospheric nuclear explosion, these neutrons can activate the various elemental components of natural air, potentially adding to the radioactive signature of the event as a whole. The goal of this work is to make an order-of-magnitude estimate of the total amount of air activation products that can result from an atmospheric nuclear explosion.
Date: March 13, 2013
Creator: Lowrey, Justin D.; McIntyre, Justin I.; Prichard, Andrew W. & Gesh, Christopher J.
Partner: UNT Libraries Government Documents Department

Progress Towards Optimally Efficient Schemes for Monte Carlo Thermal Radiation Transport

Description: In this summary we review the complementary research being undertaken at AWE and LLNL aimed at developing optimally efficient algorithms for Monte Carlo thermal radiation transport based on the difference formulation. We conclude by presenting preliminary results on the application of Newton-Krylov methods for solving the Symbolic Implicit Monte Carlo (SIMC) energy equation.
Date: September 26, 2007
Creator: Smedley-Stevenson, R P & Brooks III, E D
Partner: UNT Libraries Government Documents Department

AXIAL TEMPERATURE AND PRESSURE DISTRIBUTION IN EGCR. DEVELOPMENT OF THE PTD-1 PROGRAM

Description: The equations and procedures of the PTD-1 program for obtaining the surface temperature distribution, the gas bulk temperature, and the pressure distribution for any of the 234 channels in the EGCR are developed. The program, in FORTRAN for the IBM 7090, is designed for any arbitrary power distribution yielding a constant gas outiet temperature or a given maximum surface temperature and includes the effects of thermal radiation on surface and bulk gas temperatures. The flow sheet and some results are included. (auth)
Date: February 18, 1964
Creator: Robinson, J.C. & Lence, J.T.
Partner: UNT Libraries Government Documents Department

COMPARATIVE NUCLEAR EFFECTS OF BIOMEDICAL INTEREST

Description: Selected physical and biological data bearing upon the environmental variations created by nuclear explosions are presented. Emphasis is placed upon the early consequences of exposure to blast, thermal radiation, and ionizing radiation to elucidate the comparative ranges of the major effects as they vary with explosive yield and as they brief definitions of the terminology employed is followed by a section that utilizes text and tabular material to set forth events that follow nuclear explosions and the varied responses of exposed physical and biological materials. Finally, selected quantitative weapons-effects data in graphic and tabular form are presented over a wide range of explosive yields to show the relative distances from Ground Zero affected by significant levels of blast overpressures, thermal fluxes, and initial and residual penetrating ionizing radiations. However, only the early rather than the late effects of the latter are considered. 52 references. (auth)
Date: September 1, 1960
Creator: White, C.S.; Bowen, I.G.; Richmond, D.R. & Corsbie, R.L.
Partner: UNT Libraries Government Documents Department

Core Component Pot

Description: The core component pot is an open top vessel used to hold both new and irradiated core components for storage in the IDS and for holding the components submerged in sodium while being trasported inside CLEM. The top of the CCP is equipped with a grapple lip which is engaged by the hoisting grapples. Heat for maintaining the preheat of new components and dissipation of decay heat of irradiated fuel assemblies is conducted between the wall of the pot and the surrounding environment by thermal radiation and convection.
Date: December 19, 1975
Creator: Martin, R. L. & Omberg. R. P.
Partner: UNT Libraries Government Documents Department

FURTHER STUDIES ON THE RELATIONSHIP BETWEEN EXPOSURE TIME AND DEPTH OF DAMAGE OF MODERATE AND SEVERE CUTANEOUS BURNS

Description: To extend our earlier studies on the relationship between exposure time and depth of damage of moderate and severe burns, injuries were produced by each of six radiant exposures delivered during varying exposure times. The exposures investigated were: 5, 8, 10, 13, 16, and 20 calories per square centimeter. Within this range, as the radiant exposure increased, the exposure time for the production of maximum damage also increased. Injury from a given radiant exposure was less with exposure times either longer or shorter than some immediate time which led to the most severe injury. The relationship between steam bleb formation and decreased depth of injury from short exposure times is pointed out. When the superficial layers of the skin become so hot that vaporization of tissue fluid occurs, energy which might otherwise damage the deep layers is diverted by the conversion of water to steam. For radiant exposures between 8 cal/cm/sup 2/ and 20 cal/cm/sup 2/ delivered with a square pulse, it is possible to predict with fair accuracy the exposure time which will result in the deepest burn. (auth)
Date: October 31, 1957
Creator: Payne, F.W. & Hinshaw, J.R.
Partner: UNT Libraries Government Documents Department

Thermal Radiative Heat Transfer to Space From a Body Enclosed by a Semitransparent Body

Description: Bumpers were proposed for protecting space radiator systems from penetration by meteoroids. The development of equations to determine the thermal energy dissipation to space by a hot body completely enclosed by a second body is presented. The particular case of heat dissipation from space radiators enclosed within the bumpers is considered, and the criteria for selection of bumper materials for a minimum weight radiator system are discussed. (auth)
Date: May 1, 1960
Creator: Hefner, R. J.
Partner: UNT Libraries Government Documents Department

SUTDIES ON SUB-FABRIC BURNS: THE RELATIONSHIP OF SURFACE APPEARANCE AND DEPTH OF DAMAGE A METHOD OF STUDY, PRELIMINARY RESULTS, AND OBSERVATIONS OF WOUND HEALING

Description: Relationships between surface appearance and actual depth of damage of sub-fabric burns have been established for only a few burns. Since surface appearance has been the most widely used criterion for evaluating the ability of fabrics to protect against radiant energy, it is of some importance to know whether or not bare skin and sub-fabric burns of similar appearance are of comparable severity. In this experiment it was found that both types of burn when produced by one second exposures and when graded 3/sup +/ moderate because of their surface appearance are, indeed, equally severe. Observations on healing of the two types of burn suggest no differences in the manner or rate of tissue restoration. (auth)
Date: December 8, 1958
Creator: Berkley, K.M.
Partner: UNT Libraries Government Documents Department