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IEEE Transactions on Nuclear Science

Issue 2 • Date April 1981

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Displaying Results 1 - 25 of 240
  • [Front cover]

    Publication Year: 1981, Page(s): c1
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  • IEEE Transactions on Nuclear Science

    Publication Year: 1981, Page(s): c2
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  • Proceedings of the Sixth Conference on the Application of Accelerators in Research and Industpry

    Publication Year: 1981, Page(s):nil1 - 1004
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  • Contents

    Publication Year: 1981, Page(s):1005 - 1013
    Cited by:  Papers (2)
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  • Comments on the Conference

    Publication Year: 1981, Page(s): 1014
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  • Conference Committees

    Publication Year: 1981, Page(s):1015 - 1016
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  • Generation of the High-Q Ions by the Cryebis Method

    Publication Year: 1981, Page(s):1017 - 1023
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    Very high ionization degrees may be reached by a stepwise ionization process. The CRyogenic Electron Beam Ion Sources are linear containment devices which mainly use a magneto-focused electron beam. We give herewith the operating principles of this machine and descriptions of some technological elements. The performances of the operating devices are described. View full abstract»

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  • Accel-Decel Method of Producing High-Q Low Velocity Ions

    Publication Year: 1981, Page(s):1024 - 1028
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (938 KB)

    The double EN tandem Van de Graaff accelerators at the University of Pittsburgh's Nuclear Physics Laboratory have been used in part since 1978, operating in the 3-stage mode, as a source of highly stripped but low velocity ions for experiments of interest to atomic physics. Much of the work has involved investigating the technical details of this new accel-decel technique and gaining practical exp... View full abstract»

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  • Interpretation of High-Q Scattering Experiments

    Publication Year: 1981, Page(s):1029 - 1031
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (450 KB)

    A theoretical model has been developed for the calculation of the states of ionization of target atoms after impact by an energetic high charge state ion. The calculational method is based upon using the three-body classical-trajectory Monte Carlo approach combined with the independent electron model to determine the target ionization cross sections. Calculated cross sections for rare gas targets ... View full abstract»

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  • Capture by Highly-Charged Low-Energy Ions Studied with a Secondary Ion Recoil Source

    Publication Year: 1981, Page(s):1032 - 1035
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (630 KB)

    When a highly-charged fast projectile collides with a neutral atom in a gaseous target it may, in a single collision, remove many electrons from the target while transferring no more than a few eV to the target's center of mass. These low-energy highly-charged (LEHQ) recoils may be extracted for use as a secondary ion beam to study subsequent capture reactions in a second gas target. We have devel... View full abstract»

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  • Environmental Influences on K X-Rays from Highly Stripped Sulfur Ions Teavelng in Solids

    Publication Year: 1981, Page(s):1036 - 1038
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1358 KB)

    As a fast heavy-ion passes through a material medium, it undergoes multiple collisions in which electrons are continuously lost and recaptured by the ion, and as a result, an equilibrium distribution of excited states is quickly established. The high density of electrons in a solid state environment enables these collisional excitation and decay processes to compete with x-ray and Auger decay. As ... View full abstract»

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  • Collisions of Highly Stripped Ions at MeV Energies in Gas Targets: Charge Transfer and Ionization

    Publication Year: 1981, Page(s):1039 - 1042
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (534 KB)

    We have measured cross sections for charge transfer and ionization in H2 and rare-gas targets by fast, highly ionized Carbon, iron, niobium, and lead ions in charge states +3 to +59, with energies in the range 0.1-4.8 MeV/amu. Experimental results are compared with classical-trajectory calculations; agreement is generally good. For a given target, the cross sections for net ionization reduce to a ... View full abstract»

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  • Single and Multiple Electron Loss Processes in MeV Heavy Ion-Target Collisions

    Publication Year: 1981, Page(s):1043 - 1052
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2311 KB)

    Experimental data, derived from the study of interactions between MeV heavy ions and gaseous targets, are presented which illustrate important physical aspects such as the dependence of cross sections on projectile velocity, and projectile and target atomic numbers. Included are data which reflect the importance of the electron binding energy, the existence of shell effects, the possibility of tar... View full abstract»

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  • Radiative Electron Capture for F8+ and F9+ Ions in Collisions with a He Gas Target

    Publication Year: 1981, Page(s):1053 - 1055
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (551 KB)

    The x rays from the radiative electron capture (REC) to the projectile K-shell were investigated for F8+ and F9+ ions incident on the He target atoms in the projectile energy range from 15 to 40 MeV. The peak energies of the K-REC x-ray spectra were found to decrease linearly with a decrease of the projectile energies as expected and extrapolated to the correct ls binding energies at zero velocity... View full abstract»

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  • Reduction of the Electron Capture Cross-Section for Protons in Hydrocarbon Cases

    Publication Year: 1981, Page(s):1056 - 1058
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (406 KB)

    The total electron capture cross section of 0.8 - 3.0 MeV protons in various hydrocarbon gases (CHn - C4H , n = 2 - 8) has been measured. We find that the electron capture cross section per carbon atom decreases as the number of carbon atoms per molecule is increased. This reduction amounts to ~7% for 3 MeV protons and is ~ 25% for 0.8 MeV protons. We find no significant change in the electron cap... View full abstract»

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  • Cross Section for Radiative Electron Capture(REC) by 20-80 MeV CL Ions Incident on C and CU Foils

    Publication Year: 1981, Page(s):1059 - 1062
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (558 KB)

    Radiative electron capture (REC) cross sections for 40-80 MeV Cl ions incident on thin C foils are reported and compared with previous results using Cu targets. We find that the measured REC cross section per K vacancy scales according to the number of "free" electrons on the target atom, i. e., those bound target electrons with a velocity much less than the incident projectile velocity. Compariso... View full abstract»

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  • Dielectronic and Radiative Recombination of Highly Stripped Sulfur Ions Incident on Argon

    Publication Year: 1981, Page(s):1063 - 1065
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (394 KB)

    We have measured sulfur K x-ray emission following electron capture for 70 MeV Sq+(q=13-16) ions incident on Ar. K radiation resulting from capture was isolated by detecting coincidences between S K x rays and electron capture events. Two recombination processes which result in the emission of a K x ray were identified: (1) dielectronic recombination, which is the inverse Auger effect and (2) radi... View full abstract»

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  • Electron Capture from Inner Shells by Fully Stripped Ions

    Publication Year: 1981, Page(s):1066 - 1068
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    Theories for electron capture from inner shells by fully stripped ions are compared with experiments for K-shell vacancy production, The recently developed theory goes beyond the Oppenheimer-Brinkman-Kramers (OBK) approximation since it accounts for the perturbed stationary-state (PSS) and relativistic (R) effects in the description of inner shells as well as for the Coulomb (C)-deflection of the ... View full abstract»

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  • Electron Capture by Protons and Deuterons

    Publication Year: 1981, Page(s):1069 - 1071
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    Cross section measurements are reported for electron capture into the 3s state by 20-150 keV protons and deuterons incident on molecular hydrogen and deuterium. Conventional wisdom indicates that these cross sections should be nearly identical at equivalent velocities and researchers routinely use deuteron projectiles to extend proton excitation curves downward in velocity. This practice has been ... View full abstract»

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  • Investigation of Electron Capture Cross Section Additivity for CF4 C2F6 and C4F8 at Ep = 0.8 and 1.5 MeV

    Publication Year: 1981, Page(s):1072 - 1073
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (282 KB)

    We have investigated single electron capture cross section additivity for the fluorocarbon molecules, CF4, C2F6 and C4F8 at proton energies of 0.8 and 1.5 MeV. Applying the post-collision-interaction (PCI) model to the case where the electron capture cross sections,¿10, for C and F are quite similar, we are able to provide an internally consistent parameterization of these molecular electron capt... View full abstract»

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  • K-Vacancy Production in Heavy-Ion-Atom Collisions at Small Impact Parameters

    Publication Year: 1981, Page(s):1074 - 1077
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    The probability P(b) of forming K vacancies in 60-MeV I + Ag collisions with center-of-mass scattering angles ¿cm between 20° and 144° was measured. The measured probability varies approximately as sin2¿cm, as predicted for the kinematic peak part of 2p¿-2p¿ rotatational coupling. We conclude that while the shape of P(b) indicates that 2p¿-2p¿ rotational coupling is important in the creati... View full abstract»

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  • L-Shell Ionization in Proton and Alpha Particle Collisions with Argon

    Publication Year: 1981, Page(s):1078 - 1080
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (517 KB)

    We report results of coupled-state calculations of argon L-shell ionization by proton and alpha particle collisions in the 100 to 500 kev/amu energy range. Our target-centered basis includes up through f-states. We have explored the angular momentum convergence and ability of our pseudostates to describe the ionization continuum by comparing to the Born calculations of Choi; excellent agreement is... View full abstract»

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  • Relative Population of the Levels of the 1s2s2p and 1s2p2 Configurations of Argon from Three Electron Excited Atoms

    Publication Year: 1981, Page(s):1081 - 1083
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The possible contributions of the cascading from higher excited states to the states which can deexcite by the x-ray and Auger processes are investigated for Li-like argon. A model is developed to calculate the probability that a given excited state will eventually populate a particular lower excited state. The model requires the calculation of the transition rates of the cascading levels. Numeric... View full abstract»

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  • Calculation of Double Differential Cross Section for Fast Ion and Electron Impact Ionization of Atoms

    Publication Year: 1981, Page(s):1084 - 1088
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (827 KB)

    The theory of the energy and angular distribution of electrons ejected in electron-atom and ion-atom collisions, within the framework of Born approximation, is discussed. Particular attention is paid to the case where the incident ion carries along its own electrons. Examples are given for e, H+, and He+ collisions with He. It is shown that for fast collisions, excellent agreement with experiment ... View full abstract»

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  • A One and a Half Centered Expansion for Ion Atom Collisions

    Publication Year: 1981, Page(s):1089 - 1091
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (297 KB)

    A new method for numerically calculating ion atom collisions is presented. It uses time dependent amplitudes for target excitation and ionization but time independent amplitudes for charge transfer. It is efficient in its use of computer time and removes the known difficulty with a single centered expansion for the proton hydrogen system below 60 keV. View full abstract»

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IEEE Transactions on Nuclear Science focuses on all aspects of the theory and applications of nuclear science and engineering, including instrumentation for the detection and measurement of ionizing radiation; particle accelerators and their controls; nuclear medicine and its application; effects of radiation on materials, components, and systems; reactor instrumentation and controls; and measurement of radiation in space.

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