Remeasurement of γ-Ray reference lines

Deslattes, Richard D.; Kessler, E. G.; Sauder, W. C.; Henins, Albert

doi:10.1016/0003-4916(80)90394-2

Cited by 150 publications

(29 citation statements)

References 68 publications

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“…When it can be studied reliably it provides a basis for considerable gain in precision compared to cases where only broader smooth distributions are discemable. Conversely, when such structures are present and not clearly resolved, serious systematic difficulties can be encountered, as surely was the case in some of our early work on crystal-to-crystal transfer measurements [2].…”

Section: A New Lattice Comparatormentioning

confidence: 96%

“…Besides this, one can measure optical transitions in one-and two-electron ions and muonic atoms to test basic theory. One can also measure Rydberg transitions in other exotic atoms to determine meson masses, specifically, those of the negative pion and the negative kaon [2]; the n + p capture l' can be interpreted as yieldin~the neutron mass [3]. Finally, when the scale is extended to sufficiently high energies that the corresponding mass change can also be measured with high relative accuracy, a new combination of fundamental constants, namely NAh/ c, becomes available for increasing the order of overdetermination in adjustments of the fundamental constants and for enforcing consistency between the local scale for high-energy 1'-rays and that for low-energy ')'-rays [4].…”

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confidence: 99%

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Remeasurement of a Silicon lattice period

Deslattes

Tanaka

Greene

et al. 1987

IEEE Trans. Instrum. Meas.

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Abstract-Opitcal interferometry of an Silicon lattice period is an important link between macroscopic and microscopic lengths as well as between low-energy and high-energy spectroscopies. An evident discrepancy between two pre-1982 measurements has limited the effective application of these results. Very recent results, reported here in a preliminary way, appear to further understanding and removing this discrepancy. I. BACKGROUND AND MOTIVATIONM EASURE M E NTS linking local networks of secondary standards occurring in different spectral regions are important throughout the entire electromagnetic spectrum. The story is particularly well known to this conference in the case of the microwave-to-optical connection where the realization of a frequency synthesis chain, together with the availability of narrow-line optical oscillators, has permitted effective unification of these two regions. The situation arising when one attempts to continue this progession to the X-and -y-ray regions is perhaps less widely known but presents also some serious challenges and offers, as well, interesting rewards for successfully overcoming the evident difficulties. Although there are procedures involving many relatively small steps through the UV -and X-ray region these are not capable of giving accurate results largely because of the absence of narrowband oscillators in the intermediate (X-ray) region. To some extent, perfect monocrystalline lattices offer an alternative to sharp lines, at least in the region between 0.1 and 1.0 nm, but these are not fully equivalent to narrowline oscillators even over the limited band in which they are available. Once one reaches the region of intense nuclear -y-rays (ca 100 ke V and above), sharp lines are again available but the problem of linking these to visible light is formidable.In recent years a practical procedure has emerged for covering the 18 octaves between red light and 400 ke V (the local standard lamp for -y-ray people). In the first step of this procedure, the lattice period of a perfect monocrystalline silicon slab is determined by simultaneous Xray and optical interferometry of a common baseline. A

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Section: A New Lattice Comparatormentioning

confidence: 96%

mentioning

confidence: 99%

Remeasurement of a Silicon lattice period

Deslattes

Tanaka

Greene

et al. 1987

IEEE Trans. Instrum. Meas.

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“…Then, the ratio of the scales relative to the wavelength can be given as E(electron-mass or X-ray scale) £(wavelength scale) 1+oref· ( 2) The reference-scale index implies, therefore, a shift of the scales. The reference-scale index for the 411-ke V line of 198 Au <I) is, therefore calculated to be -25.279± 19.603 ppm.…”

Section: Energy Scalesmentioning

confidence: 99%

Methodological Errors in Precise Measurement of Gamma-Ray Energies with Ge Detectors

Kishikawa

1991

Journal of Nuclear Science and Technology

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Methodological errors in the precise measurement of r-ray energies with Ge detectors are examined basing on a model of photopeak shape function. The model revealed that the centroid of the normal distribution embedded in the phenomenal photopeak is to be compared with the energy scale. The peak difference rate is introduced to evaluate the peak difference, the essential quantity of experimentally giving secondary energy standard, relative to the energy difference. Varied value of the gap difference-rate index with several physical parameters has indicated that the secondary r-ray energies have a definite amount of methodological errors. A typical methodological error in the r-ray energy at around 300 keV is in the range of -263±125 --54±123 eV (or -877±418--180±411 ppm). Commonly used "conventional" energycalibration methods by the use of the most probable peak-height position have been reviewed. Origins of methodological errors are discussed. A new energy-calibration method using the centroid is proposed.

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“…As described in [3] the energies were calibrated using A1 and C1 transitions observed as background. These gamma-ray energies are known precisely [8,9] and are related in a known manner to the 411.8044(11) keV Au decay standard [10]. For the relative intensities the procedures as described in Sect.…”

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confidence: 99%

“…For 2~ the normalisation was such that the sum of the primary intensities was 100%. After correcting for recoil the gamma-rays were located in level schemes in the same positions as pre- (10) keV were also used so as to obtain a more 'rigid' scheme. Least-squares fits of the level energies to the gamma-ray energies were performed so as to obtain the final level and binding energies.…”

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confidence: 99%