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  • Other Sources  (7)
  • 1980-1984  (7)
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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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  • 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
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  • 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
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  • 4
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    Nuclear gamma rays from 720-MeV alpha-induced reactions on Al-27 and Si-28 (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Prompt gamma rays from the interaction of 720-MeV alpha particles with Al-27 and Si-28 were detected and analyzed to identify residual nuclei and to determine cross sections for production of specific levels. No gamma-ray transitions were detected from nuclei heavier than the target. From Doppler broadening, the momentum of the residual nuclei was estimated. The results are compared with previous results for 140- and 1600-MeV alphas on Al-27 and approximately 200-MeV positive or negative pions on Al-27 and Si-28 and fitted to a spallation-yield formula.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: Physical Review C - Nuclear Physics; vol. 22
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  • 5
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    Absence of J/pi/, T = 0/+/, 1 level excitations in residual nuclei from /pi /+ or -/,2N/ reactions (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Gamma-ray spectra taken in prompt coincidence with incident 180-MeV pi/+/, 220-MeV pi/-/ and 0-MeV pi/-/ on the self-conjugate targets C-12 and S-32 reveal that the cross sections/yields are equal to or near zero for production of the J/pi/,T = 0/+/, 1 levels of the odd Z, odd N nuclei resulting from np removal. It is thought that the 0-MeV pi/-/ results can be explained by selection rules governing one-step quasi-free interactions but that the delta(1232) region results cannot. This indicates that there may be additional restrictions upon the pion absorption mechanism.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: Physical Review C - Nuclear Physics; vol. 23
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  • 6
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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
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  • 7
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    Muon spin rotation research program (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Data from cyclotron experiments and room temperature studies of dilute iron alloys and iron crystals under strain were analyzed. The Fe(Mo) data indicate that the effect upon the contact hyperfine field in Fe due to the introduction of Mo is considerably less than that expected from pure dilution, and the muon (+) are attracted to the Mo impurity sites. There is a significant change in the interstitial magnetic field with Nb concentration. The Fe(Ti) data, for which precession could clearly be observed early only at 468K and above, show that the Ti impurities are attractive to muon (+), and the magnitude of B(hf) is reduced far beyond the amount expected from pure dilution. Changes in the intersitital magnetic field with the introduction of Cr, W, Ge, and Si are also discussed. When strained to the elastic limit, the interstitial magnetic field in Fe crystals is reduced by 33 gauss, and the relaxation rate of the precession signal increases by 47%.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: NASA-CR-163829
    Format: application/pdf
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