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  • 1
    Electronic Resource
    Electronic Resource
    Reevaluation of the conversion coefficient of the 14.4 keV transition in57Fe (1970)
    Springer
    The European physical journal 238 (1970), S. 6-10 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Existing values of the conversion coefficient of the 14.4 keV transition in57Fe have been reevaluated using newK-shell fluorescence yields and recent decay scheme information. Previous disagreements are removed and the mean values found are α T =8.26±0.19, α K =7.37±0.17.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01399573
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  • 2
    Electronic Resource
    Electronic Resource
    Photon Asymmetry of Deuteron Photodisintegration Between 160 and 410 MeV (1999)
    Springer
    Few body systems 26 (1999), S. 213-226 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract.  The photon asymmetry Σ of the reaction has been measured across the photon energy range 160–410 MeV at the Mainz Microtron MAMI. Linearly polarized photons were obtained from coherent bremsstrahlung and their energies were determined with the Glasgow tagging spectrometer. The large acceptance detector DAPHNE enabled the outgoing protons to be measured over the complete azimuthal range and for polar angles from 35° to 155° in the c.m. system. The data are compared with existing results and recent theoretical calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010050115
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  • 3
    Electronic Resource
    Electronic Resource
    TheL 1 subshell fluorescence and Coster-Kronig yields forZ=96 (1972)
    Springer
    The European physical journal 250 (1972), S. 293-299 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High resolution Si(Li)-Si(Li) and Si(Li)-Ge(Li) detector arrangements have been used to studyL x-ray spectra in coincidence withL-shell internal conversion electrons, gamma rays, andK x-rays emitted in249Cf decay. TheL 1 subshell fluorescence and Coster-Kronig yields determined forZ=96 from these spectra are ω1=0.25±0.06,f 12≦0.10, andf 13=0.69 ±0.08. The presence of theL 1-L 3 radiative transition is also further confirmed in this work.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01395051
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  • 4
    Electronic Resource
    Electronic Resource
    Multipolarity determination fromL x-ray spectra in the decays of227Th,243Am, and249Cf (1972)
    Springer
    The European physical journal 255 (1972), S. 161-174 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new method to determine the multipolarity of a converted γ-transition from itsL x-ray spectrum has been extended by a coincidence technique and applied in the complex decays of227Th,243Am, and249Cf. TheL x-ray spectra of four low energy transitions have been measured in coincidence with cascading high energy γ-rays and theirM1-E2 mixing ratios obtained by comparison with calculatedL x-ray line intensities. The following results were obtained: for the 3/2+→l/2+ ground-state transition in223Ra, an admixture of (74±12)%E2, for the 7/2+→5/2+ ground-state transition in239Np, less than 30%E2, for the 9/2+→7/2+ ground-state transition in245Cm, (63±10)%E2, and for the 11/2−→ 9/2− transition in the third rotational band in245Cm, (32±10)%E2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01394524
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  • 5
    Electronic Resource
    Electronic Resource
    L 2 andL 3 subshell fluorescence and Coster-Kronig yields forZ=96 from the decay of249Cf (1971)
    Springer
    The European physical journal 248 (1971), S. 208-219 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TheL 2 andL 3 subshell fluorescence and Coster-Kronig yields forZ=96 have been measured by theK-L x-ray coincidence method with high resolution Si(Li) and Ge(Li) x-ray detectors. The results ν2=0.650±0.036, ω2=0.552±0.032, ω3=0.515±0.034, andf 23=0.188±0.019 agree fairly well with theory. New measurements of theL x-ray singles spectra of244Cm and238Pu with a high resolution Si(Li) detector permitted reevaluation of the values of ω2 andf 23 forZ=92 and 94 reported by Byrneet al. The revised values atZ=92 are ω2=0.529±0.035 andf 23=0.23±0.12, and atZ=94, ω2=0.523±0.023 andf 23=0.24±0.08. These revised values are in much better agreement with theory and with current experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01396477
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  • 6
    Electronic Resource
    Electronic Resource
    Precision determination of high-Z K-shell fluorescence yields from195Au,207Bi, and235Np decays (1972)
    Springer
    The European physical journal 249 (1972), S. 373-385 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new method utilizing a cooled, high resolution, windowless Si(Li) x-ray and Auger electron detector has been developed for the accurate measurement of high-Z K-shell fluorescence yields. With this method, values of theK-fluorescence yield ω k have been determined with high accuracy atZ=78, 82, and 92 from the radioactive decay of carrier-free195Au,207Bi, and235Np, respectively. The values of ω k are 0.968±0.008, 0.972±0.008, and 0.970±0.005, respectively where the error limits represent 95% confidence. In addition, relativeK-Auger electron group intensities atZ=92 were measured and found to be(K-LL)∶(K-LX)∶(K-XY)=100∶(65.2±6.0)∶ (8.1±0.8). The experimental results for ω k are compared with the relativistic calculations of Bhalla, Ramsdale and, Rosner, and satisfactory agreement is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01386769
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  • 7
    Electronic Resource
    Electronic Resource
    Mean L-shell x-ray fluorescence yields atZ=47, 60, and 63 (1972)
    Springer
    The European physical journal 256 (1972), S. 131-137 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract MeanL-shell x-ray fluorescence yields $$(\bar \omega _L )$$ have been measured by observingK andL x-ray spectra emitted in the decay of109Cd,145Pm, and153Gd with a high resolution Si(Li) x-ray detector. The results forZ=47, 60, and 63 are as follows: $$\bar \omega _L $$ =0.0425±0.0064, 0.131±0.017, and 0.142±0.023, respectively. Additional values of $$\bar \omega _L $$ from this laboratory atZ=55, 56, 57, 59, and 65 are also tabulated as are previous experimental values atZ=47, 60, and 63. For comparison, theoretical estimates of $$\bar \omega _L $$ were computed using theoreticalL-subshell fluorescence and Coster-Kronig yields, together with subshell vacancy distributions calculated from the literature. The theoretical estimates atZ=47, 60, and 63, based on the subshell calculations of Chen, Crasemann, and Kostroun, agree well with experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01400485
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  • 8
    Electronic Resource
    Electronic Resource
    Measurement of the πmeson polarizabilities via the γp → γπ+n reaction (2005)
    Springer
    The European physical journal 23 (2005), S. 113-127 
    Details
    ISSN: 1434-601X
    Keywords: 12.38.Qk Experimental tests ; 13.40.-f Electromagnetic processes and properties ; 13.60.Le Meson production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. An experiment on the radiative π{+}-meson photoproduction from the proton ( γp → γπ{+}n) was carried out at the Mainz Microtron MAMI in the kinematic region 537MeV 〈 Eγ 〈 817MeV, 140°≤ $ \theta_{{\gamma \gamma ^{\prime }}}^{{{{\rm cm}}}}$ ≤180°. The π{+}-meson polarizabilities have been determined from a comparison of the data with the predictions of two different theoretical models, the first one being based on an effective pole model with pseudoscalar coupling while the second one is based on diagrams describing both resonant and nonresonant contributions. The validity of the models has been verified by comparing the predictions with the present experimental data in the kinematic region where the pion polarizability contribution is negligible ( s1 〈 5mπ2) and where the difference between the predictions of the two models does not exceed 3%. In the region, where the pion polarizability contribution is substantial ( 5 〈 s1/mπ2 〈 15, -12 〈 t/mπ2 〈 - 2), the difference $\ensuremath{(\alpha -\beta )_{\pi^{+}}}$ of the electric (α) and the magnetic (β) polarizabilities has been determined. As a result we find $\ensuremath{(\alpha -\beta )_{\pi^{+}}=(11.6\pm 1.5_{{\rm stat}}\pm 3.0_{{\rm syst}}\pm 0.5_{{\rm mod}})\times 10^{-4}{}{\rm fm^{3}}}$ . This result is at variance with recent calculations in the framework of chiral perturbation theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/i2004-10056-2
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  • 9
    Electronic Resource
    Electronic Resource
    L-subshell fluorescence and coster-kronig yields atZ=92 and the decay of235Np (1972)
    Springer
    The European physical journal 255 (1972), S. 335-347 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TheK andL x-rays emitted in the decay of235Np have been studied with high resolution Ge(HP) and Si(Li) detectors in coincidence, in order to obtain theL 2 andL 3 subshell fluorescence and Coster-Kronig yields atZ=92. The results are:v 2=0.630±0.036, ω2=0.560±0.033,f 23=0.147±0.010, and ω3=0.481±0.029. Results for theL 1 subshell were derived from singles spectra, by assuming a value off 13 of 0.67, and are:v 1=0.54±0.04, ω1=0.21±0.04, andf 12〈0.07. With the same assumption, theL 1/K electron capture ratio and decay energyQ ec for235Np were found to be 29.0±3.6 and 123.6±0.7 keV, respectively. RelativeL x-ray intensities forZ=92 also were measured and are compared with the theory of Scofield and with recent diffraction experiments. Electron ejection from theL shell during235Np decay has been studied byL x-ray-L x-ray coincidences and found to occur with a probability of (1.3±1.0) × 10−4 per disintegration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01392538
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