## 1981 Vol. 5, No. 1

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**Abstract:**

The EAS electron density spectrum has been observed with a samll plastic scintillation counter array. The preliminary result was obtained, in which the exponent of spectrum is -1.52±0.02.

**Abstract:**

A pairing vibrational model of meson with J

^{P}=1

^{-}is discussed including their energy spectra, configurations and decay mechanism. While the mixing configurations of valence quarks as well as the sea quark pairs in vacuum are taken into account, it is possible to propose a classification for hadronie decay of mesons and thereby a corresponding explanation of OZI rule.

**Abstract:**

Exact relations between the energy of a symmetric nuclear matter loaded in a classical π field and the value

*φ*and wave number

*k*of this π field were obtained for pseudoscalar coupling and pseudovector coupling. Results show that there is no π condensation under pseudoscalar coupling. If pseudovector coupling (which is not renormalizable) were permitted,

*π*condensation emerges as a result of

*π*nucleon

*P*wave interaction, and the chiral symmetry is not necessary.

*π*nucleon interaction itself leads to saturation of the condensed

*π*field. Nonlinear selfinteractions of

*π*field, such as

*φ*term and so on, are not necessary. The influence of nucleonic repulsive core were considered under Yan der Waals approximation. It leads to upper and lower limits on wave numbers of the condensed

^{4}*π*fields. If the radius of the repulsive core were larger than a critical value,

*π*condesation becomes impossible again.

**Abstract:**

We attempt use a simple fireball model to explain the slow rise of the ratio

*R*≡〈N

_{A}_{A}〉/〈N

_{N}〉 of the charged multiplicity for proton-nucleus scattering to that for proton-proton scattering verses the apparent nuclear thickness <span style="border-top: 1px solid; padding-top: 0px;"><em>v</em></span>. The pseudo-rapidity distribution

*dN*is also discussed. In this model, the pi mesons are emitted by fireballs created during nucleon-nucleon scattering. When the incident energy

_{A}/d_{η}*E*

_{lab}Z 50 GeV/

*c*

^{2}, these fire-balls take so long a time to expend to thermal equilibrium that the fireballs have passed through the nucleus completely before pions are emitted. As a result, the charged multiplicity is greatly reduced.This model gives excellent fittings to pp charged mutiplicity,

*R*verses <span style="border-top: 1px solid; padding-top: 0px;"><em>v</em></span> as well as

_{A}*R*

_{emalsion}verses

*E*

_{lab}without any free theoretical parameter. By choosing only one parameter for the equilibrium of angular momentum,

*dN*can be fitted satisfactorily except for the large pseudo-rapidity region.

_{A}/d_{η}**Abstract:**

In this paper we discussed the following problems in the

*SU*(3)×

*U*(1) unified model proposed earlier: (ⅰ) Two possible choices of the Higgs fields and their comparison with the Weinberg-Salam model; (ⅱ) The form of the Higgs self potential and the realization of the spontaneous symmetry breaking; (ⅲ) The relation between the mass spectrum and the generalized Cabibbo mixing angles in a model with several generations of fermions.

**Abstract:**

An complex convolution method was introduced. Using this method the exact solutions of the three-dimensional electron shower equation in the non-homogeneous medium in which the density distribution function was continuous or finite discontinuous are obtained. These solutions included the approximation A and approximation B, the homogeneous and non-homogeneous medium case. Thus, the Nishimura-Kamata's classical results are extended.

**Abstract:**

Secondary charged particles produced in hadron-hadron collisions are divided quantitatively into two kinds in the light of the picture given by the authors [1, 2] and the results deduced therefrom. One of these parts, the genuine newborn particles, is analysed by means of the

*N(Q)*dependence in [1]. Under the assumption that the dependence of the fluctuation of the number of newborn quark pairs on the ratio of kinetic to potential energies takes the form of a compound Poisson distribution, it is shown that the multiplicity distributions, dispersions, correlations and KNO scaling in pp collisions can be fitted with a single parameter on a unified basis. General formula of moments c≡<n>

^{k}/<n>

^{k}are given and their asymptotic properties are studied, resulting in an explanation of the appearance and behavior of the KNO scaling. A brief ldiscussion is given to the possible origin of the multiplicity distribution.

**Abstract:**

The background field strength of the vacuum with the energy band structure in a 3 dimensional sphere with a finite radius

*R*is calculated. In general, it is not equal to zero. It tends to zero as

*R*→∞.

**Abstract:**

A

*SU*(3) lepton model is discussed in which the left- and right-handed leptons are on equal footing and sin

^{2}θ

*=1/4 is obtained. Dynamical symmetry breaking is investigated to see if lepton mass difference can be generated in this way so as to reduce the number of Higgs scalars and Yukawa coupling constants. Calculating the effective potential up to two-loop graphs gives the results that composite Goldstone bosons can exist only when the remained Yukawa coupling constant lies within a certain range. The corresponding heavy lepton mass obtained is about 130 GeV.*

_{w}**Abstract:**

In this paper, the C-G series of

*SU*

_{3}group is studied using Racah-Speier theorem. A general formula which can be used to calculate irreducible representations and their occupation number in C-G series of

*SU*

_{3}group is derived. The general formula is very straight forward and effective for actual calculation One can apply the formula to analyse the distribution rule of occupation number in C-G series of

*SU*

_{3}group and to define the null space of Winger operator of

*SU*

_{3}group, the latter is important to the calculation of Wigner coefficients when there is a multiplicity.

**Abstract:**

In order to study the variation of shell effects as well as pairing effects with nuclear temperature, we have extended the work of Sano and Yamasaki to generalize the HFB equations to finite nuclear temperature with the help of variational principle. When nullear temperature

*θ*→0, sulh generalized HFB equations reduce to the conventional HFB equations. While the fermi gas model results can be obtained in the high temperature limit.

**Abstract:**

The nucleon exchange can be divided into two different modes, the equal one and unequal one. Assuming that the motion of nucleon is random and according to Einstein relation the number of equal and unequal exchange is discussed. The total energy loss and the angular momentum for the reaction Kr+Kr have been calculated. The results. show that the total energy loss is only partly induced by nucleon exchange, while the. angular momentum dissipation is mainly induced by nucleon exchange and the equal exchange is more important than unequal one in both cases.

**Abstract:**

Using the HFB cranking model, the RAL effect of g

_{9/2}proton pair and neutron pair for three forking phenomenon in

^{68}Ge is studied. Calculations show that two backbending of three forking in

^{68}Ge are mainly caused by rotation alignment of g

_{9/2}proton pair and neutron pair.

**Abstract:**

In this paper, the scattering amplitude is expanded by two eikonal wave functions which propagate along the incoming and outgoing directions respectively to replace the distorted wave functions in DWBA. Then, we obtain a method to calculate the non-relativistic large angle scattering. This method can be easily generalized to relativistically phenomenological dynamical equation.

**Abstract:**

Assuming uniform magnetization of individual magnet piece, a three dimensional analytical expression for the magnetic field of a newly developed multipole structure—the permanent magnet segmented ring structure—is derived.

**Abstract:**

In this paper the nonleptonic D

^{0}-decays are discussed. Using Gilman and Wise's methods, we derived the effective Hamiltonian for Cabibbo-suppressed nonleptonic D

^{0*}-decays. The rate F(D

^{0}→K

^{+}K

^{-})/Γ(D

^{0}→π

^{+}π

^{-})～1.26 is obtained. Some problems in this method of the calculations are discussed roughly.

**Abstract:**

The differential cross section of π

^{+}-

^{`16}O elastic scattering at

*T*

_{πlab}=240,343 MeV is calculated using a microscopic description of the π-nucleus scattering. The results are in agreement with the experimental data qualitatively.

**Abstract:**

The golden secition methor is applied to get a good tip pole of magnet for an accelerator. It turns out that this method is more efficient than Others.

**Abstract:**

In this short paper, we present a method for treating polarized proton beam and polarized target scattering according to the Glauber quark model.

**Abstract:**

The current distribution in the back-bending region is calculated based on the particlerotor model with particle number conservation. The results show that the sudden increase of aligned angular momentum in the backbending region corresponds to a drastic change of the current distribution.

**ISSN** 1674-1137 **CN** 11-5641/O4

Original research articles, Ietters and reviews Covering theory and experiments in the fieids of

- Particle physics
- Nuclear physics
- Particle and nuclear astrophysics
- Cosmology

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