共查询到20条相似文献,搜索用时 31 毫秒
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D. Dekkers J.P. Guillaud V. Lepeltier M.N. Minard H. Pessard T.R. Willitts M. Yvert 《Nuclear Physics B》1977,131(1):72-79
Measurement of the exotic exchange reaction π?p → K+Σ? has been performed at 5 and 8 GeV, in the ?0.015 to ?0.13 and ?0.009 to ?0.15 (GeV/c)2 range of t repectively. We give the value near t = 0 of the differential cross section at 5 GeV, 21?21+76 nb/(GeV/c)2, and an upper limit (< 37 nb/GeV/c)2) at 8 GeV. As a check the measured differential cross section is given at both energies for the reaction π+p → K+Σ+ in the same range of t. 相似文献
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E. Buluggiu 《Journal of Physics and Chemistry of Solids》1980,41(1):43-45
Recent ESR experimental data on Mn2+?Cu2+ pairs, obtained by doping with manganese the dimeric Cu (pyridine N-oxide) Cl2·.H2O complex, are interpreted by means of a strong isotropic exchange model. Theg values of the pair and the hyperfine constants at the manganese and copper nuclei, for the observed effective spin S = 2, are given by the relations , , where gMn, gCu,AMn and ACu are the characteristic single-ion values for the quoted constants. The antiferromagnetic coupling between the Mn2+ spin and the Cu2+ spin is responsible for the observed g values, all measurably lower than the free electron value. Also to be noted are the enhancement of the hyperfine constant at the manganese nucleus, and the curious change of sign for that at the copper nucleus. 相似文献
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A. Berglund T. Buran P.J. Carlson C.J.S. Damerell I. Endo A.R. Gillman V. Gracco R.J. Homer M.J. Hotchkiss A. Lundby M. Macri B.N. Ratcliff A. Santroni T. Tso F. Wickens J.A. Wilson 《Physics letters. [Part B]》1975,57(1):100-104
For the first time, the reactions π+p→K+∑+ and K?p→π?∑+ have been studied in the same apparatus. This has been done at an adequately high momentum (10.1 GeV/c) to allow a check of the prediction of exchange degeneracy, that the differential cross sections should be converging at high energy. We have measured the cross section for momentum transfers t between tmin and t = ?0.3 (GeV/c)2. We find that for both reactions the differential cross section shows an exponential fall, with no deviations right in to t =tmin (where some other experiments have shown a dip in the cross section). Furthermore, we find the magnitude of the differential cross sections to be closely similar at t = 0, with a ratio However, the slope for the positive reaction is about 19% steeper than that for the negative reaction. 相似文献
5.
P.F. Bernath R.W. Field B. Pinchemel Y. Lefebvre J. Schamps 《Journal of Molecular Spectroscopy》1981,88(1):175-193
Laser excitation spectra have been recorded for Ca79Br and Ca81Br in the spectral region 600–630 nm. The use of a 1-m monochromator as a narrow band pass filter (1–2 cm?1) has allowed rotational analysis of the 0-0, 1-1, and 2-2 bands of the B2Σ+ - X2Σ+ transition and the 0-0 and 1-1 bands of the A2Π - X2Σ+ transition. A few additional lines of the 0-1, 1-2, 1-0, and 2-1 bands of the B-X system were used to obtain band origins for vibrational analysis. The main constants for Ca79Br are (in cm?1):
0 | 15 958.41 (10) | 16 383.137 (6) | ||||
285.732 (9) | 288.56 (20) | 285.747 (9) | ||||
0.840 (4) | — | 0.954 (4) | ||||
0.094466141 (30) | 0.0957343 (20) | 0.0965151 (20) | ||||
0.000403551 (40) | 0.0004327 (20) | 0.0004483 (15) | ||||
(spin-rot.) | 0.00301484 (50) | — | 0.068767 (79) | |||
— | ?0.066834 (64) | — | ||||
— | 59.175 (1) | — |
0 | 15 624.67(5) | 15 700.52(12) | ||||
238.7496(33) | 241.19(7) | 242.63(17) | ||||
0.62789(64) | 0.53(5) (Pekeris) | 1.17(12) (Pekeris) | ||||
0.0693254(84) | 0.070460(14) | 0.071572(22) | ||||
2.640(35) | 2.15(10) | 3.95(2) | ||||
— | 45.8968(52) | — | ||||
2.8286(2) | 2.8057(3) | 2.7839(4) |
Reciprocal centimeters | ||||||
Te | ωe | ωexe | Be | αe | re (Å) | |
a3Π | 8574 | 1132 | 8.4 | 1.3675 | ?0.0168 | 1.4623 |
3 | 29 767.32(1) | 1 | 29 997.29(1) | |||
3 | 522.841(27) | 1 | 522.553(2) | |||
0.22990(22) | 0.22931(8) | |||||
0.00113(14) | 0.00108(2) | |||||
1 | 56.9840(12) | |||||
1 | ?0.02426(6) | |||||
3 | ?0.17367(46) |
State | ||||||
0 | 818.7 | 4.2 | — | — | — | |
x ≈ 2272 | 814.1 | 4.3 | 0.35920 | 2.38 | 2.8 | |
21 467.4 | 565.8 | 2.9 | — | — | — | |
x + 18 521.7 | 570.4 | 2.6 | 0.28856 | 1.82 | 2.9 |
ωe | ωeXe | Be | αe | re(Å) | |
---|---|---|---|---|---|
B1∑+ | 2012.97 | 12.95 | 1.7805(4) | 0.0219(6) | 1.1198 |
A1II | 1444.49 | 15.73 | 1.4660(5) | 0.0201(1) | 1.2350 |
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