| 1. |
- Dutta, D, et al.
(author)
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Nuclear transparency with the gamma n ->pi(-)p process in He-4
- 2003
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In: Physical Review C (Nuclear Physics). - 0556-2813. ; 68:2: 021001
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Journal article (peer-reviewed)abstract
- We have measured the nuclear transparency of the fundamental process gamman-->pi(-)p in He-4. These measurements were performed at Jefferson Lab in the photon energy range of 1.6-4.5 GeV and at theta(cm)(pi)=70degrees and 90degrees. These measurements are the first of their kind in the study of nuclear transparency in photoreactions. They also provide a benchmark test of Glauber calculations based on traditional models of nuclear physics. The transparency results suggest deviations from the traditional nuclear physics picture. The momentum transfer dependence of the measured nuclear transparency is consistent with Glauber calculations that include the quantum chromodynamics phenomenon of color transparency.
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| 2. |
- Zhu, LY, et al.
(author)
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Cross-section measurement of charged-pion photoproduction from hydrogen and deuterium
- 2003
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In: Physical Review Letters. - 1079-7114. ; 91:2: 022003
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Journal article (peer-reviewed)abstract
- We have measured the differential cross section for the gamman-->pi(-)p and gammap-->pi(+)n reactions at theta(c.m.)=90degrees in the photon energy range from 1.1 to 5.5 GeV at Jefferson Lab (JLab). The data at E(gamma)greater than or similar to3.3 GeV exhibit a global scaling behavior for both pi(-) and pi(+) photoproduction, consistent with the constituent counting rule and the existing pi(+) photoproduction data. Possible oscillations around the scaling value are suggested by these new data. The data show enhancement in the scaled cross section at a center-of-mass energy near 2.2 GeV. The cross section ratio of exclusive pi(-) to pi(+) photoproduction at high energy is consistent with the prediction based on one-hard-gluon-exchange diagrams.
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| 3. |
- Wang, YD, et al.
(author)
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Stress-orientation distribution function (SODF) - Description, symmetry and determination
- 2000
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In: Materials Science Forum. - 0255-5476 .- 1662-9752. ; 347-3, s. 66-71
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Journal article (peer-reviewed)abstract
- In this paper, a stress-orientation distribution function (SODF) is defined to describe statistically the distribution of the stress state of grains as a function of crystal orientation. Similar to the crystal orientation distribution function (CODF), the SODF may be expressed as generalized spherical harmonics. The two symmetry groups existing in the SODF, namely the crystal symmetry and the sample symmetry, are discussed. A method to construct the SODF directly from neutron or X-ray diffraction data is described, Finally, the validity of the method is demonstrated by stress analysis of simulated strain distributions in an austenitic stainless steel under tensile loading.
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| 4. |
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| 5. |
- Wang, YD, et al.
(author)
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Stress-orientation distribution function (SODF) - Description, symmetry and determination
- 2000
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In: ECRS 5: PROCEEDINGS OF THE FIFTH EUROPEAN CONFERENCE ON RESIDUAL STRESSES. - : TRANS TECH PUBLICATIONS LTD. ; , s. 66-71
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Conference paper (peer-reviewed)abstract
- In this paper, a stress-orientation distribution function (SODF) is defined to describe statistically the distribution of the stress state of grains as a function of crystal orientation. Similar to the crystal orientation distribution function (CODF), the
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| 6. |
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