共查询到20条相似文献,搜索用时 9 毫秒
1.
An interactionU is called a completely analytical (CA) interaction, if it satisfies one of 12 given conditions formulated in terms of analyticity properties of the partition functions Zv(u), or correlation decay, or truncated correlation bounds, or asymptotic behavior of ln Zv(u), v→∞. The 12 conditions are presented, together with part of the proof of their equivalence. The main result of the paper is that each condition is constructive in the following sense: instead of checking it in all finite volumesv??v, it is enough to consider only (a finite amount of) volumes with restricted size. In particular, the partition functions Z v (u+?) for the complex perturbationsu+? ofu do not vanish for all V? v and all ? with ∥?∥<?, provided this is true only forv with diam v?C(?) and ∥?∥<?′ (but with?<?′). 相似文献
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We study charmonium (c(c)n(n)), bottomonium (b(b)n(n)) and exotic (cc(n)(n) and bb(n)(n)) four-quark states by means of a standard non-relativistic quark potential model. We look for possible bound states. Among them we are able to distinguish between meson-meson molecules and compact four-quark states. 相似文献
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We study charmonium (ccnn),bottomonium (b bnn) and exotic (ccnn and bbnn) four-quark states by means of a standard non-relativistic quark potential model.We look for possible bound states.Among them we are able to distinguish between meson-meson molecules and compact four-quark states. 相似文献
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Coherent states are introduced and their properties are discussed for simple quantum compact groupsA
l, Bl, Cl andD
l. The multiplicative form of the canonical element for the quantum double is used to introduce the holomorphic coordinates
on a general quantum dressing orbit. The coherent state is interpreted as a holomorphic function on this orbit with values
in the carrier Hilbert space of an irreducible representation of the corresponding quantized enveloping algebra. Using Gauss
decomposition, the commutation relations for the holomorphic coordinates on the dressing orbit are derived explicitly and
given in a compactR-matrix formulation (generalizing this way theq-deformed Grassmann and flag manifolds). The antiholomorphic realization of the irreducible representations of a compact quantum
group (the analogue of the Borel-Weil construction) is described using the concept of coherent state. The relation between
representation theory and non-commutative differential geometry is suggested.
Dedicated to Professor L.D. Faddeev on his 60th birthday 相似文献
6.
A. Müller-Arnke 《Zeitschrift für Physik A Hadrons and Nuclei》1968,215(1):62-76
A translationally invariant model is proposed which allows to calculate one-particle excitations and dipole transition probabilities of closed-shell nuclei with inclusion of the continuum. The connection of this model with the nuclear shell model is shown, and it is applied to the calculation of the photodisintegration cross section of4He. 相似文献
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《Physics letters. A》1997,229(6):335-339
We investigate a possibility of describing spin states in terms of a positive distribution function depending on continuous variables like Euler's angles. A spin state reconstruction procedure similar to the symplectic tomography is considered. A quantum evolution equation for the classical-like positive distribution function is found. Generalization to arbitrary values of angular momentum is discussed. 相似文献
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《Nuclear Physics A》1998,634(3):267-283
Recent studies have shown that the characteristics of the entrance and exit channels through compact quasi-molecular shapes are compatible with the experimental data on fusion, fission and cluster radioactivity when the deformation energy is determined within a generalized liquid drop model. Analytic expressions allowing to calculate rapidly the main characteristics of this deformation path through necked shapes with quasi-spherical ends are presented now; namely formulas for the fusion and fission barrier heights, the fusion barrier radius, the symmetric fission barriers and the proximity energy. 相似文献
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A microscopic investigation in a self-consistent particle-hole model reveals approximate unitary analog states in spite of large symmetry breaking. The K-nucleus elastic scattering and (K?, π?) excitation of these states are studied, showing strong surface effects. 相似文献
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In this paper we investigate the feasibility of employing the hyperspherical adiabatic (HA) basis set to describe continuum three-nucleon states. In particular, the HA expansion is compared with the simpler expansion on hyperspherical harmonics (HH). A practical numerical application is presented using the MT-III potential. 相似文献
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By extending the classical order parameter theory of glassy states to the case of inhomogeneous glassy states, some new consequences of the theory are derived. It is shown that the phase boundaries, critical points, and the kinetics of phase transition differ in the annealed and the quenched states. For example, the critical point of phase separation is always suppressed in the quenched states. Cahn's analysis of elastic energy effects is shown to be a special case of the present formalism. 相似文献
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D. Bucurescu G. Cǎta D. Cutoiu G. Constantinescu M. Ivascu N.V. Zamfir 《Nuclear Physics A》1985,443(2):217-236
Properties of the odd-mass Rh isotopes are investigated in the framework of the interacting boson-fermion approximation (IBFA) model in which the odd proton movea in the and orbitals. Lifetimes of some high-spin positive-parity states in 99Rh obtained by the recoil-distance method with the 88Sr(14N, 3n) reaction are also reported. Calculated excitation energies and electromagnetic properties of the high-spin positive-parity states are compared with experiment and an acceptable agreement is obtained. 相似文献
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We adopt the quasiparticle-phonon model to investigate the phonon content and the proton-neutron symmetry of low-lying states recently discovered in nuclei around shell closure. The results are in overall agreement with experiments and consistent with the interacting boson model. 相似文献