排序方式: 共有15条查询结果,搜索用时 62 毫秒
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Opper AK Korkmaz E Hutcheon DA Abegg R Davis CA Finlay RW Green PW Greeniaus LG Jordan DV Niskanen JA O'Rielly GV Porcelli TA Reitzner SD Walden PL Yen S 《Physical review letters》2003,91(21):212302
The forward-backward asymmetry in np-->dpi(0), which must be zero in the center-of-mass system if charge symmetry is respected, has been measured to be [17.2+/-8.0(stat)+/-5.5(syst)]x10(-4), at an incident neutron energy of 279.5 MeV. This observable is compared to recent chiral effective field theory calculations, with implications regarding the du quark mass difference. 相似文献
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A. Gersten L. G. Greeniaus J. A. Niskanen S. Ishikawa T. Sasakawa A. W. Thomas 《Few-Body Systems》1988,3(4):171-194
Tests of fundamental symmetries offer the promise of possibly unique insights into the nature of the strong interaction. We review the current status of selected experimental and theoretical investigations of charge symmetry in fewbody systems. 相似文献
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D. Aebischer B. Favier L.G. Greeniaus R. Hess A. Junod C. Lechanoine J.-C. Niklès D. Rapin D.W. Werren 《Nuclear Physics B》1976,108(2):214-238
The reaction pp→π+d was studied at incident proton energies of 398, 455, 497, 530 and 572 MeV. Measurements of dσ/dΩ at 455 and 572 MeV show the presence of pion d-waves in the pion-deuteron system. Asymmetry measurements yield similar conclusions. Total cross-section measurements agree with recent fits to earlier data. 相似文献
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R.H. McCamis J.M. Cameron L.G. Greeniaus D.A. Hutcheon C.A. Miller G.A. Moss G. Roy M.S. de Jong B.T. Murdoch W.T.H. van Oers J.G. Rogers A.W. Stetz 《Nuclear Physics A》1978,302(2):388-400
The differential cross section for the elastic scattering of protons from 4He has been measured for ten proton energies between 185 and 500 MeV in the angular range 144° to 168° in the lab system. The analyzing power has also been measured for seven energies in the same angular range. The differential cross section does not show the marked backward peaking that has been observed at both lower and higher energies. The possible structure in the 180° excitation function suggested for energies around 240 MeV is not observed. The analyzing power is large and negative, and shows strong dependence on both energy and angle. 相似文献
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J. Ball R. Binz J. Bystricky L. G. Greeniaus R. Hess Z. Janout B. Khachaturov C. Lechanoine-LeLuc F. Lehar A. de Lesquen A. Prokofiev D. Rapin 《The European Physical Journal C - Particles and Fields》1998,5(1):57-61
The direct reconstruction of the isospin I = 0 amplitudes is discussed under the assumption that the I = 1 amplitudes are known and that a sufficient number of independent np observables have been measured at a centre-of-mass angle . We show that at least one observable measured at angle is necessary in order to determine the I = 0 amplitudes, including the phase relative to the I = 1 amplitudes. Special cases at , and are also discussed.
Received: 4 February 1998 / Published online: 13 July 1998 相似文献
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一、TheProblem .Letf(x) =ax2 bx c ax2 px q,wherea >0 ,b2 - 4ac≤ 0andp2 - 4aq≤ 0 .OurProblemis“Whetherdoesminx∈Rf(x)exis?Moreover ,,ifminx∈Rf(x)exists,thenminx∈Rf(x)=?andinthiscasex =?” .Naturally ,weknowthatminx∈Rf(x)existsfromtheknowledgeofmathematicalanalysis.Also,wecangivethe… 相似文献