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  • SOLID-STATE PHYSICS  (4)
  • 1980-1984  (4)
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  • 1
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    A 200-MeV pi(+) induced nucleon removal from 24Mg (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Nuclear gamma rays in coincidence with outgoing pions and/or protons following single nucleon removal from Mg24 by 200 MeV pi(+) were detected with Ge(Li) detectors. Differential cross sections are reported for gamma rays from the first excited mirror states of Na23 to Mg23 in coincidence with positive pions and/or protons detected in particle telescopes at 30, 60, 90, 120 and 150 deg; angle integrated absolute cross sections and cross section ratios sigma (Mg23/sigma (Na23) are calculated. These results are compared with the predictions of the one step quasifree (OSQF), the intranuclear cascade (INC), and the nucleon charge exchange (NCX) reaction models. The OSQF and the INC calculations generally agree with the experimental results, while the NCX calculations are in disagreement.
    Keywords: SOLID-STATE PHYSICS
    Type: Virginia State Univ. Ativities of the Solid State Physics Research Inst.; 38 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Uniaxial stress induced symmetry breaking for muon sites in Fe (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Uniaxial stress was used on Fe single crystals to induce muon precession frequency shifts. The frequency shift for a nominally pure Fe sample at 302K was -0.34 + or - .023 MHz per 100 microstrain along the 100 magnetization axis. This corresponds to a change of magnetic field at the muon of 25.1 + to 1.6G/100 magnetic moment. For an Fe (3wt%Si) single crystal the shifts were -0.348 + or - .008 MHz/100 magnetic moment. The agreement between the shifts for Fe and Fe(3wt%Si) shows the effect to be intrinsic to iron and not strongly impurity sensitive. These shifts and their temperature dependence (1/T) are dominated by the effect of strain inducted population shifts between crystallographically equivalent, but mgnetically inequivalent sites. Their magnitudes are in good agreement ith previous theoretical predictions and by previous extrapolation from calculations on Nb and V especially if both 4T(0) and 1T sites contribute comparably.
    Keywords: SOLID-STATE PHYSICS
    Type: Virginia State Univ. Activities of the Solid State Physics Research Inst.; 33 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Muon hyperfine fields in iron and its dilute alloys (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The temperature dependence of the interstitial magnetic field, B, as determined by the rotation of the spin of the muon, has been measured for dilute polycrystalline iron alloys with Mo, Ti, and Nb additions over a temperature range of 240 to 633 K. In all cases the behaviors differ from one another and from the Fe(Al) alloys previously studied. B, which is negative with respect to the magnetization, is increased in magnitude by Al and Mo, and decreased greatly by Ti. The addition of Nb creates a two-phase alloy from which the role of heterogeneity and/or strain on B in iron can be assessed. If the temperature dependence of the hyperfine field extracted from B for Fe(Mo) alloys is interpreted on the model previously used to discuss the Fe(Al) data, then the muon must be attracted to the Mo atom while repelled by the Al atoms as the temperature decreases.
    Keywords: SOLID-STATE PHYSICS
    Type: Journal of Magnetism and Magnetic Materials; 25; 1981
    Format: text
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  • 4
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    Muon spin rotation in solids (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The muon spin rotation (MuSR) technique is used to probe the microscopic electron density in materials. High temperature MuSR and magnetization measurements in nickel are in progress to allow an unambiguous determination of the muon impurity interaction and the impurity induced change in local spin density. The first results on uniaxial stress induced frequency shifts in an Fe single crystal are also reported.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA-CR-172789 , NAS 1.26:172789
    Format: application/pdf
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