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Showing 1 to 19 of 19 for “"impulse approximation"”.
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Deep inelastic scattering by quantum liquids
The impulse approximation and the related concept of the scaling of the dynamic structure function S(k,$\omega$) at large k and $\omega$ have played a dominant role in the analysis of the deep inelastic neutron scattering by quantum liquids. These concepts are reviewed along with the prevalent …
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Electron-impact ionization of molecules
… has been well described by the plane wave impulse approximation (PWIA) for most molecules. For intermediate and low incident-electron energy ( ̃hundreds-tens eV) collisions, currently there has been no reliable theoretical approach for studying the micro ionization mechanism. In this …
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Photoproduction of neutral pions in helium by 335 MEV Bremsstrahlung
… compared with those calculated by means of an impulse approximation, using the amplitudes for the photoproduction of neutral pions from nucleons. The laboratory energy and angle of the He4 recoil define the kinematic variables in the He4 system but do not explicitly define the variables in the …
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Deep inelastic neutron scattering studies of condensed argon and neon
… Spectrometer (HRMECS) at IPNS, deviations from impulse approximation behavior in the wave-vector transfer region from 105 to 276 nm-1 have been investigated. At these values of the wave-vector transfer, any deviations from impulse approximation scattering are expected to arise solely from …
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Pion Absorption on Polarized Lithium-7 at 165 MeV
… predictions were made using a Distorted Wave Impulse Approximation (DWIA) and assuming that the absorption occurs on deuteron-like nucleon pairs. The measured analyzing powers were found to be consistent with zero in complete disagreement with the DWIA predictions. The reason for the …
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Strange particle production in pi-p and pi+n interactions at 2.5 GeV/c
… and therefore not spectators in the sense of the impulse approximation. Protons whose momentum lay in the interval 0 to 250 MeV/c were generally isotropic, and their momentum distribution agreed moderately well with a Hulthen distribution normalized over this interval. With the inclusion of the …
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Double Spin Asymmetry in d →(e→e'p)n
… well as a simplified model using the plane wave impulse approximation. From this comparison, it is concluded that the inclusion of final-state interactions are needed at high missing momenta, while the PWIA description works rather well at lower missing momenta. The asymmetry changes sign as a …
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Static and dynamic properties of the pion from continuum modelling of strong QCD
… truncation for the SDE-BSE system with the impulse approximation for the pion-photon vertex, we present numerical results for the pion form factor using the Ball-Chiu and bare vertices for the nonperturbative quark-photon vertex. We find that the Ball-Chiu vertex satisfies electromagnetic …
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A study of Gamow-teller strength using the 208Pb(p,n) and 181Ta(p,n) reactions at intermediate energy, Ep=122 MeV
… performed using the results of distorted-wave impulse approximation (DWIA) calculations. The spectra associated with the two reactions were decomposed into L=0,1 and 2 transfer components. The major contribution to the spectra were found to be L=O, with a very small 1=2 multipole transfer …
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Precision measurement of the spin-dependent asymmetry in the threshold region of quasielastic ³He [right arrow] (e [right arrow], e)Ì
… asymmetry was compared with both plane wave impulse approximation (PWIA) calculations and non-relativistic full Faddeev calculations which include both final-state interactions (FSIs) and meson-exchange currents (MECs) effects. The poor description of the data by PWIA calculations at both …
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Experimental study of the reaction He3 ([v], [pi+])H3 up to 260 MeV
… decreasing with increasing photon ,energy. An impulse approximation calculation was performed to relate the cross section to the matter form factor of the 3-nucleon system under the assumption of 'identical wave functions for He3 and H3, Values for the matter form factor 'obtained using this …
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Trapped hydrogen vibrational density of states measurement using IINS PdH0.0011 at 5 K and 300 K with incident neutron energy of 250 meV
… identify the proton recoil intensity within the impulse approximation. The mass of recoil particle is 1.10 amu and 1.12 amu while the recoil energy is located at 208 and 206 meV for 5 K and 300 K respectively. The 5 K VDOS primary peak energy was observed at 61.4 meV, and is attributed to the β …
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Monte Carlo studies of momentum distributions and longitudinal response functions of A=3 and 4 nuclei
… those extracted at Saclay from the plane-wave impulse approximation analysis of the exclusive reactions SHe(e,e'p)d and SHe(e,e'p)n+n. Lastly, the method of correlated basis functions (CBF) is generalized to describe the threenucleon and deuteron + nucleon continuum states. Correlated …
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Photoproduction of charged pions from deuterium near threshold
… signature. Results were compared with Baldin9s impulse approximation calculations in order to obtain the matrix element for the ~=-photoproduction process from a free neutron. The results agree with the previous experiment by Adamovich et al. and with the photoproduction theory of Chew, …
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Quasifree knockout of charged particles from ⁴He with 100 MeV protons
… to explore the validity of the Distorted Wave Impulse Approximation (DWIA) as a description of these quasifree knockout reactions, at all geometries where the knockout cross section is significant. Six particle telescopes, each consisting of two silicon detectors and a NaI detector, were used …
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Coincident proton decay of the continuum induced by 200 MeV protons on 12C
… interaction - described by a distorted wave impulse approximation (DWIA) treatment - between the incident proton and a single target nucleon, followed by the rescattering of the struck nucleon, which behaves as an intranuclear projectile, from the spectator part of the target nucleus. The …
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Robust preliminary design for multiple gravity assist spacecraft trajectories
… streamline that process as a whole. The bounded-impulse approximation is a widely used method for early stage trajectory design for low and high thrust vehicles. Many previous studies involving this method of design have focused on developing new or improved trajectory transcriptions. This …
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Deep inelastic scattering by quantum liquids
Restriction data tranferred 2014-07-01T11:12:17-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis