共查询到20条相似文献,搜索用时 31 毫秒
1.
M. Schramm H. Grawe J. Heese H. Kluge K. H. Maier R. Schubart R. Broda J. Grebosz W. Krolas A. Maj J. Blomqvist 《Zeitschrift für Physik A Hadrons and Nuclei》1993,344(4):363-367
208Pb has been excited with inelastic heavy ion scattering of 350 MeV64Ni and 420 MeV82Se on a thick208Pb target. With - coincidence measurements 2 new decays of the 10+ isomer, namely a 34.5 keVE2-transition to 8
2
+
and a 857.7 keVE3 transition to 7– have been found and the wavefunctions of the participating levels deduced. An observed gamma cascade of 295.3, 348.0, 865.4 and 340.2 keV on top of the 10+ isomer is assigned to the particle-hole states with the highest spins 14– 6744.1 keV13– 6448.9 keV12+ 6100.9 keV11+ 5235.6 keV10+ 4895.4 keV.This work has been supported in part through the agreement on scientific cooperation between Poland and Germany. 相似文献
2.
M. Bruno F. Cannata M. D'Agostino M. L. Fiandri M. Frisoni M. Lombardi 《Few-Body Systems》1986,1(1):63-68
Differential cross sections of the reactiond+3He3H+p+p have been measured atE
d
=23.083 MeV in two different kinematical configurations. A gas target was used in order to obtain absolute differential cross sections and two E–E telescopes allowed a very good identification of the various particles coming from thed+3He reaction. The role of the finalstate interactions and repulsive Coulomb effects appears rather distinctly. 相似文献
3.
T. M. Aliev N. A. Guliev I. G. Dzhafarov F. T. Khalil-Zade 《Russian Physics Journal》1981,24(2):159-163
On the basis of an arbitrary (V, A) structure of the neutral weak ¯ee and LL currents (L=–, M0) a study is made of the processes of production in colliding electron-positron beams of pairs of heavy leptons with subsequent decays in accordance with the schemes e+e––(µ–vµv) + +( anything) and e+e–M0(µ–e+ve) + M0( anything). The energy spectrum and asymmetry of the distribution of the produced muons are investigated.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 66–70, February, 1981. 相似文献
4.
Yuan-Ben Dai Chao-Shan Huang Hong-Ying Jin 《Zeitschrift fur Physik C Particles and Fields》1993,60(3):527-534
The most general form of covariant B-S wave functions and the corresponding integral equations for heavy mesons with arbitrary spin and parity are obtained in the infinite mass limit. A general formula for the I-W functions for transitions between states with arbitrary spin-parity and the ground state is given in terms of these wave functions. Using the covariant instantaneous approximation we apply this formulism to calculate I-W functionsr
1/2,r
3/2 and rates of processes in which a or is emitted in the transitions 1–0–, 0+0–, 1+1–. 相似文献
5.
Maurice Guillot André Marchand François Tcheou H. Le Gall 《Zeitschrift für Physik B Condensed Matter》1982,49(3):221-228
On single crystals of holmium iron garnet (HoIG), magnetic properties have been studied in magnetic field up to 150kOe applied parallel to the main crystallographic directions in the 4.2–300K temperature range. Above 130 K, the magnetization is isotropic and linear magnetic field dependent as previously found in polycrystals and predicted by Néel's ferrimagnetic theory. Nevertheless the paramagnetic Curie temperature is much higher than the polycrystal value. Below 130K, due to the onset of the umbrella structure, the ferrite magnetization presents a non linear field variation with [111] as easy direction. The field evolutions of the anisotropy constants (K
1 andK
2) were calculated. Optical absorption measurements of both 585I
6 and 5I
85I
7 transitions are reported and compared to the results of the literature in terms of inequivalent magnetic sites. 相似文献
6.
P. A. éminov 《Russian Physics Journal》1991,34(1):86-90
We compute probabilities for the processes ee+Z+H, and e++e–Z+H in a superstrong magnetic field. It is shown that the magnetobremsstrahlung of the Higgs boson with the Z boson in the magnetic field Bs>B0=m2/e=4.41·1013 G may be a relatively probable process, and that the superstrong magnetic field significantly influences the process e++e–Z+H, which is possible even in the absence of the field.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 1, pp. 104–108, January, 1991.The author thanks V. Ch. Zhukovskii and A. V. Borisov for discussions on the results of this work. 相似文献
7.
The mechanism and kinetics of energy transfer from highly excited Xe states (E
ex > 9.5 eV), generated by a 12-ns electron beam, to chlorine donor molecules were deduced from time-resolved spectra of fluorescence in the region 240–340 nm. The emissions at 240–250 nm were assigned to Xe2** excimers, and those at 308 and 340 nm to XeCl(B) and XeCl(C) states. Kinetic analysis of the recorded spectra for Xe–CCl4 and Xe–SOCl2 gas mixtures at constant xenon pressure and various pressures of molecular admixtures (0.1–1 Torr) allowed us to find the rate constants for the reactions (5) Xe** + RCI products, (6a) Xe** + RCl XeCl(B) + R*, and (6b) Xe** + RCl XeCl(C) + R*, where R is any radical. 相似文献
8.
The mechanism and kinetics of energy transfer from highly excited Xe states (E
ex > 9.5 eV), generated by a 12-ns electron beam, to chlorine donor molecules were deduced from time-resolved spectra of fluorescence in the region 240–340 nm. The emissions at 240–250 nm were assigned to Xe2** excimers, and those at 308 and 340 nm to XeCl(B) and XeCl(C) states. Kinetic analysis of the recorded spectra for Xe–CCl4 and Xe–SOCl2 gas mixtures at constant xenon pressure and various pressures of molecular admixtures (0.1–1 Torr) allowed us to find the rate constants for the reactions (5) Xe** + RCI products, (6a) Xe** + RCl XeCl(B) + R*, and (6b) Xe** + RCl XeCl(C) + R*, where R is any radical. 相似文献
9.
We have investigated the basic spectroscopic properties of Cr3+-doped gallium garnets. Weak crystal fields (Dq/B=2.39–2.55) lead to broad4
T
24
A
2 fluorescence in the 700–950 nm range depending on the chemical composition of the crystals. At room temperature the4
T
24
A
2 transition is homogeneously broadened, whereas the 4 K spectra of the2
E4
A
2 transition show inequivalent Cr3+ sites and inhomogeneous linewidths of 8 cm–1 in these laser crystals. From 300 to 4 K, the oscillator strength of the4
T
24
A
2 transition is reduced by a factor of about 0.6 due to the temperature dependent electron phonon coupling. The transition probability of the2
E4
A
2 transition correlates with the energetic position of the4
T
2 level, which is admixed into the2
E level via spin-orbit coupling. The comparison of the2
E4
A
2 phonon sideband structure in garnets of different chemical compositions allows the assignment of some peaks to GaO4-tetrahedron modes of the garnet structure. 相似文献
10.
A new procedure is devised to evaluate the proton form-factor at the ¯pp threshold from experimental data on ¯ppe
+
e
– annihilation at rest. Comparison of the ¯ppe
+
e
– and¯pp
+– processes reveals that annihilation ranges for various channels are ranked in line with quark dynamics.This work has been funded in part by the German Federal Minister for Research and Technology (BMFT) under the contract number 06HD756 相似文献
11.
A new expression e is obtained for resonance in the reaction e+e– ar
+– with allowance for the radiative corrections, which also contain the emission of hard photons by the final leptons and the final value of the energy resolution E. An expression is obtained for the total probability of radiative lepton decay. A numerical analysis of the experimental data is made for the reaction +–, and the parameters e+e– (3, 1) e+e–, and
e
2
/, e, and are determined for (3, 1) resonance-with allowance for the radiative corrections.This paper was read (November 17–21, 1975) at a session on high-energy physics of the Department of Nuclear Physics of the Academy of Sciences of the USSR.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 29–34, March, 1977. 相似文献
12.
M. P. Rekalo 《Russian Physics Journal》1981,24(9):843-848
The paper considers the formation of gluon and quark jets in the inelastic scattering of electrons by nucleons with large momentum transfers. It is assumed that these jets are created by the processes e–+qe–+q+g and e–+ g e–+q+q, where q is a quark and g is a gluon. The angular distributions of gluon and quark jets are calculated in the lowest order in the quark-gluon coupling constant. It is shown that after integration the processes e–+qe–+q+g and e–+g e–+q+¯q lead to violation of the scaling invariance of deep-inelastic scattering of electrons by nucleons.Translated from Izvestiya Vysshkikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 68–73, September, 1981. 相似文献
13.
TheK
S
0
0
l
+
l
– andK
L
0
0
l
+
l
– decays are considered within the framework of the Standard model in the one-photon exchange approximation, i.e.K
S,L
0
0+ *0 +l
+
l
–. To evaluate the low-energy matrix elements of theK
0(¯K
0)0+ * transitions, the constituentquark-loop approximation, based on the extended Nambu-Jona-Lasino (NJL) model, is used. The obtained results are compared with other theoretical estimates and the experimental bounds. 相似文献
14.
I. I. Golovach V. S. Gerasimenko V. Yu. Slivka N. I. Dovgoshei M. I. Golovei A. V. Bogdanova 《Russian Physics Journal》1976,19(3):294-298
A study is made concerning the photoconductivity, the edge absorption, and the far-infrared spectra of AgAsS2, AgSbS2, AgBiS2 crystals and glasses. The oscillation spectrum of monoclinic smithite (AgAsS2) and miargyrite (AgSbS2) is explained here by the presence of As-S, Sb-S, and Ag-S bonds. The rank of symmetry and the degree of bond metallization, which both increase in the order AgAsS2 AgSbS2 AgBiS2, cause the structure of the far-infrared spectra to become simpler and the tendency vitrification to become weaker in the same order.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 39–45, March, 1976. 相似文献
15.
B. M. K. Nefkens S. D. Adrian D. B. Barlow P. DiBernardo A. D. Eichon R. S. Kessler J. N. Labrenz C. Pillai J. W. Price J. A. Wightman W. J. Briscoe L. H. Kramer M. F. Taragin D. F. Ottewell 《Few-Body Systems》1992,12(2-4):133-140
First results on –
d are reported. The measurements were made using 8 specially designed neutron counters, which were carefully calibratedin situ. The differential cross sections atT
=142, 180, 217, and 254 MeV were obtained at four angles between 0° and 90°, they are compared to +
d pp data measured at the same energies and angles with the same setup. At every beam energy, the shape of the angular distributions of –
d nn and +
d pp is the same to ±2%. The absolute cross sections differ by 1 to 10%. The error in this comparison is ±4% implying a small violation of charge symmetry.Dedicated to Prof. I. laus on the occasion of his 60th birthdayDeceased 相似文献
16.
The enhancement of the Li+H2LiH+H reaction due to laser excitation of the Li atom to the2p state has been investigated using absorption techniques. Using a rate equation model we obtain from our data a reaction cross-section [Li(2p)+H2LiH+H]=(0.10±0.03)Å2 at 515°C. By selectively exciting one Li isotope the reaction is made isotope selective, suggesting an efficient means of isotope separation. 相似文献
17.
In a continuation of an earlier study, the electromagnetic fields of a point magnetic moment — a magneton — in uniform rectilinear motion, with a given spin precession, are analyzed. It is shown that the same equations can be found through Lorentz transformations from the corresponding expressions in the rest frame. The relationship between the electric and magnetic fieldsE andH radiated by a point magnetic dipole moment and a point electric dipole moment is derived through the use of dual transformations of the electromagnetic field tensor. It is assumed that each moment is in relativistic and otherwise arbitrary motion. In the relativistic case, as in the nonrelativistic case, the switch is accompanied by the replacementsHE, E-H. A covariant formalism is developed for describing the electromagnetic fields in the wave zone. The electromagnetic field tensor associated with the radiation is analyzed.V. V. Kuibyshev Tomsk State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 3, pp. 73–78, March, 1993. 相似文献
18.
U. Krey 《Zeitschrift für Physik B Condensed Matter》1983,54(1):1-9
The localization properties of certain spin-dependent, one-dimensional electronic systems with only off-diagonal disorder are studied. In higher dimensions (d=2,3) the models considered would correspond to different universality classes, whereas ford=1 no qualitative difference is found: ForE=0, all eigenstates are exponentially localized, whereas forE0 the localization length diverges logarithmically, such that exactly atE=0 the geometric average of the transmission coefficient would decay with increasing chain lengthL as exp (-const. ·L
1/2), instead of the usual, exponential decay.ForE=0, in the interior of the band, the localization lengthr
0 diverges W
2
–2 in the limit of weak disorder (W
20), whereas just at the band edge one has roughlyr
0W
2
–2/3. A universal recursion relation, depending only on the energy and on certain randomly distributed determinants, determines the localization length and the density of states for all systems considered. 相似文献
19.
We present a systematic approach to the calculation of finite-size (FS) effects for anO(n) field-theoretic model with both short-range (SR) and long-range (LR) exchange interactions. The LR exchange interaction decays at large distances as 1/r
d+2–2,0+,0+. Renormalization group calculations ind=d
u
– are performed for a system with a fully finite (block) geometry under periodic boundary conditions. We calculate the FS shift of the critical temperature and the FS renormalized coupling constant of the model to one-loop order. The universal scaling variable is obtained and the FS scaling hypothesis is verified. 相似文献
20.
B. Kerbikov 《Zeitschrift für Physik A Hadrons and Nuclei》1995,353(1):113-115
We predict that production of theK
+K– atom inpd 3
He X and similar reactions exhibits a drastic missing mass spectrum due to the interplay withf
0(975) resonance. We point out that high precision studies of theK
+K– atom may shed a new light on the nature off
0(975).Communicated by: B. Povh 相似文献