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in subjects: "Scattering"

Transport of Proton, Hydrogen and Alpha Particles through Atomic Hydrogen Environment

Using multiple theoretical methods, comprehensive calculations are performed to create a new and more comprehensive data set for elastic scattering and related transport cross sections for collisions of (H$^+$ + H), (H + H) and (He$^{2+}$ + H) in the center-of-mass energy frame. In proton-atomic hydrogen collisions, we have significantly updated and extended previous work of elastic scattering, charge transfer and related transport integral and differential cross sections in the center-of-mass … more

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Date: December 2023

Creator: Zaman, Tamanna

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

A Report on the Kinematics of High Energy Electron Scattering

"A convenient summary is given of useful formulas on the kinematics of high energy electron scattering together with a derivation of the relevant formulas for transforming from the center of mass to the laboratory system such parameters as scattering cross sections. The formulas derived hold for any two- body collision: the approximation (m = 0) employed for the electron scattering calculations is rigorously true for the elastic scattering of photons."

Date: May 23, 1957

Creator: Bernstein, Jeremy

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Spatially confined protein assembly in hierarchical mesoporous metal-organic framework

Article discusses how the immobilization of biomolecules into porous materials could lead to significantly enhanced performance in terms of stability towards harsh reaction conditions and easier separation for their reuse. To gain insights into the spatial arrangement of biomolecules within the nanopores, the authors used in situ small-angle neutron scattering (SANS) to probe deuterated green fluorescent protein (d-GFP) entrapped in a mesoporous MOF.

Date: February 21, 2023

Creator: Wang, Xiaoliang; He, Lilin; Sumner, Jacob; Qian, Shuo; Zhang, Qiu; O'Neill, Hugh et al.

Item Type: Article

Partner: UNT College of Science

[Turtle Creek Chorale: Scattering Kris Anthony's Ashes at Central Christian Church]

Photograph of a group of people outside of Central Christian Church in Dallas during the scattering of Kris Anthony's ashes. The group stands in front of a row of flowers and a series of large windows. They smile towards the camera.

Date: 199X

Item Type: Photograph

Partner: UNT Libraries Special Collections

open access

The Low Energy Photodisintegration of 3H and 3He and Neutron-Deuteron Scattering

The cross sections for electric dipole photodisintegration of H/sup 3/ and He/sup 3/ at low energies are expressed in terms of the effective range parameters of the doublet n-d scattering matrix. Agreement with the experimental results is possible for either set of n-d scattering lengths.

Date: 1959

Creator: Delves, L. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Progress Report No. 39 for the Period September 1, 1955 through November, 1955

This is the thirty-seventh progress report of the Laboratory for Nuclear Science at the Massachusetts Institute of Technology. Progress during the period of June 1, 1955 through August 31, 1955 is reported on: (1) Chemistry of the fission elements group, (2) Nuclear chemistry (inorganic) group, (3) Nuclear chemistry (organic) group, (4) Cosmic ray group, (5) Elementary particle scattering group, (6) Neutron physics group, (7) ONR generator group, (8) Radioactivity group, (9) Cyclotron group, (1… more

Date: November 30, 1955

Creator: {{{name}}}

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Analytic Approach for the Pion-Proton Scattering Phase Shifts

A simple method of solving for the phase shifts of the pion-proton scattering is presented. The rapid solution afforded can be utilized, as the Ashkin diagrams have been employed, to give starting values to an electronic computer or alternatively to analyze with more ease the variation of the phase shifts as a function of the input data in terms of the coefficients of the angular distributions. A new plot of a function of the total cross section versus the pion energy is introduced. The nearly … more

Date: December 7, 1955

Creator: Rarita, William, 1907-

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A Cloud Chamber Study of the Secondary Particles from Locally Produced Penetrating Showers

The present experiment was undertaken as an attempt to throw more light on the decay processes that had been observed prior to the summer of 1952, as well as to investigate any new decay processes that might manifest themselves. The source of high energy primary particles was to be the cosmic ray beam, so a detector of locally produced high energy penetration showers was used. In order to be able to detect effectively low energy photons and low energy secondaries from particles reaching the end… more

Date: September 1955

Creator: Harmon, Norman Frederick

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Progress Report No. 37 for the Period June 1, 1955 through August 31, 1955

This is the thirty-seventh progress report of the Laboratory for Nuclear Science at the Massachusetts Institute of Technology. Progress during the period of June 1, 1955 through August 31, 1955 is reported on: (1) Chemistry of the fission elements group, (2) Nuclear chemistry (inorganic) group, (3) Nuclear chemistry (organic) group, (4) Cosmic ray group, (5) Elementary particle scattering group, (6) neutron physics group, (7) ONR generator group, (8) Radioactivity group, (9) Cyclotron group, (1… more

Date: August 31, 1955

Creator: {{{name}}}

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

High-Energy Electron Scattering and the Charge Distribution of Selected Nuclei

Experimental results are presented of electron scattering by Ca, V, Co, In, Sb, Hf, Ta, W, Au, Bi, Th, and U, at 183 Mev and (for some of the elements) at 153 Mev. For those nuclei for which asphericity and inelastic scattering are absent or unimportant, i.e., Ca, V, Co, In, Sb, Au, and Bi, a partial wave analysis of the Dirac equation has been performed in which the nuclei are represented by static, spherically symmetric charge distributions. Smoothed uniform charge distributions have been ass… more

Date: October 1955

Creator: Hahn, Beat & Ravenhall, D. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Anisotropic Elastic Scattering of Neutrons

In an elastic collision the neutron loses part of its kinetic energy to the nucleus with both the kinetic and momentum of the system being conserved. However, for many elements the scattering is not isotropic in the center-of-mass system at the higher neutron energies. Many of the present reactor multigroup codes include anisotropic scattering at the high neutron energies, while many others assume isotropic scattering at all energies. In order to consider some of the effects of including anisot… more

Date: March 21, 1957

Creator: Copenhaver, C. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Cross Section Program at ORNL

Short reports to the members of the Nuclear Cross Section Advisory Group from three groups: (1) High voltage group; (2) Fast chopper time-of flight spectrometer; and (3) Electronuclear research division.

Date: January 21, 1957

Creator: Harvey, J. A. & Fowler, J. L. (Joseph L.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Relaxation Time Approximations in PAOFLOW 2.0

Electronic transport properties have been used to classify and characterize materials and describe their functionality. Recent surge in computational power has enabled computational modelling and accelerated theoretical studies to complement and accelerate experimental discovery of novel materials. This work looks at methods for theoretical calculations of electronic transport properties and addresses the limitations of a common approximation in the calculation of these properties, namely, the … more

Date: May 2022

Creator: Jayaraj, Anooja

Item Type: Thesis or Dissertation

Partner: UNT Libraries

open access

Single-Step Photochemical Formation of Near-Infrared-Absorbing Gold Nanomosaic within PNIPAm Microgels: Candidates for Photothermal Drug Delivery

Article demonstrating the dynamic potential for tailoring the surface plasmon resonance (SPR), size, and shapes of gold nanoparticles (AuNPs) starting from an Au(I) precursor, chloro(dimethyl sulfide)gold (I) (Au(Me2S)Cl), in lieu of the conventional Au(III) precursor hydrogen tetrachloroaurate (III) hydrate (HAuCl4). This approach presents a one-step method that permits regulation of an Au(I) precursor to form either visible-absorbing gold nanospheres or near-infrared-window (NIRW)-absorbing a… more

Date: June 28, 2020

Creator: Marpu, Sreekar; Kamras, Brian; Nasiri, Nooshin Mirza; Elbjeirami, Oussama; Simmons, Denise Perry; Hu, Zhibing et al.

Item Type: Article

Partner: University of North Texas

open access

Calculated Scattering Kernels For Light Water at 23C, 42C, 61C, and 82C

This report contains a listing of the bound-proton kernels for neutron scattering which were calculated in conjunction with the USAEC Control Rod Materials Program.

Date: May 27, 1962

Creator: Kerr, B. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Inelastic Cross Sections and [ ] For Some Fissionable Isotopes

The transmissions of neutrons through spherical shells of normal uranium, oralloy, and Pu239 are reported. One group of measurements was made using a pure fission neutron source produced by thermal neutrons. The other group of measurements was made using monoenergetic neutrons. From both groups of measurements, the inelastic scattering cross sections have been determined according to methods developed in Los Alamos Scientific Laboratory Report LA-1429 (Jaunary 1955).

Date: August 1955

Creator: Bethe, Hans A. (Hans Albrecht), 1906-2005; Beyster, J. Robert, 1924-2014 & Carter, R. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Interpretation of Scattering from a Liquid-like Binary

In the general liquid-like binary three radial densities relating to A-A, B-B, and A-B pairs are needed to characterize the scattering. The three densities can be obtained by the Fourier inversion of the weighted combination of three diffraction patterns, each of which differs by the alteration of the scattering of one or both components. If the density of atoms regardless of type is the same around both components, then only two functions, one this distribution, and the other involving the ord… more

Date: 1962

Creator: Keating, D. T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Electron-Atom Scattering and Nucleon-Nucleus Scattering -- An Analogy

An analogy is drawn between low-energy nucleon-nucleus scattering and low-energy electron-atom scattering. Proper scaling indicates that the Ramsauer resonances ln electron scattering are analogous to the "size'' resonances of nucleon scattering. Total cross sections, angular distributions, and spin polarizations are calculated. An imaginary potential is introduced, and its consequences for direct electron-atom interactions are discussed.

Date: 1962

Creator: Goldberg, Murrey D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Two Lectures on the Magnetic Scattering of Neutrons

In these lectures we will discuss some examples of information about magnetic properties of solids which can be obtained by neutron scattering. We consider a scattering process in which a neutron with wave vector k and spin σ is incident upon a solid in state q>. (Here q stands for all of the quantum numbers which describe the state of the solid, such as spin and orbital electronic states, phonon numbers, etc.) After interacting with the solid, the neutron goes off with wave-vector k' and spin … more

Date: January 13, 1964

Creator: Blume, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Effect of Long-Range Interactions on Order

Harrison and Paskin (HP) have calculated the ordering energy of β-CuZn using recent theoretical techniques of treating electron screening and Mott's polar model of an alloy. Good agreement is obtained between the calculated total energy of the order-disorder transformation and specific heat measurements. A consequence of the HP calculation is that the ordering energy is long-range and oscillates in sign. Walker and Keating recently measured the neutron diffuse scattering of β-CuZn above the cri… more

Date: December 24, 1963

Creator: Paskin, Arthur

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Inelastic Neutron Scattering by Liquids

The inelastic scattering of low energy neutrons from condensed matter offers a means of investigating the motions of atoms in liquids or solids down to times in the order of 10-12 to 10-13 seconds. The theoretical framework and techniques of such measurements are discussed and the results of cold neutron measurements with liquid H2O and Pb are presented. In H2O the neutron data show that for times in the order of 10-12 seconds the water molecule tends to maintain some average position with resp… more

Date: January 7, 1964

Creator: Palevsky, H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

An Investigation of the Low Frequency Motions in Isotactic and Atactic Polypropylene by Neutron Inelastic Scattering

The vibrational spectra between 1000 and 30 cm-1, derived from measurements of the inelastic scattering of "cold" neutrons, are presented for isotactic polypropylene at samples temperatures below and above both the glass transition and the melting point. A tentative assignment of the observed modes is suggested by comparison with recent calculations by Miyazawa, Ideguchi, and Fukushima of the optically active phases of the fundamental vibrations for an isotactic helical polypropylene chain and … more

Date: October 14, 1963

Creator: Safford, G. J.; Danner, H. R. & Boutin, H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Interactions of High Energy Antiprotons in Hydrogen

In the fall of 1961 an extensive program of investigation of high energy p-p interactions was begun at the Brookhaven AGS. The BNL 20" liquid hydrogen bubble chamber and an electrostatically separated beam were used to obtain a total (to date) of 300,000 exposure with about 15 antiprotons per pulse. The exposures were made at antiproton momenta of 3.25 Bev/c and 3.69 Bev/c in the laboratory. Approximately 80% of the exposures were made 3.69 Bev/c antiprotons. A wide variety of reactions occur i… more

Date: October 15, 1963

Creator: Baltay, C.; Ferbel, T.; Sandweiss, J.; Taft, H. D.; Culwick, B. B.; Fowler, W. B. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Study of Low Frequency Molecular Motions in HF, KHF2, KH2F3 and NaH2F3

The spectra of KHF2, KH2F3, NaH2F3, liquid and solid HF were measured between 1200 and 30 cm-1 by the inelastic scattering of "cold neutrons" (0.005e.v.). The spectrum of KHF2 is in agreement with previous infrared measurements and shows a peak at 147 mV corresponding to a deformation frequency v2 of the F-H-F group and a broad peak at 13 mV due to a libration of this group. The observed spectra for KH2F3, NaH2F3 solid and liquid HF were compared with that for KHF2 considering the known results… more

Date: March 12, 1963

Creator: Boutin, Henri & Safford, G. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department