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Hypertriton and light nuclei production at Λ-production subthreshold energy in heavy-ion collisions

Chinese Physics C 2011年第8期35卷 741-746页

作者：张松陈金辉马余刚许长补蔡翔舟马国亮钟晨 Shanghai Institute of Applied Physics the Chinese Academy of Sciences Brookhaven National Laboratory UptonNew York11973USA

High-energy heavy-ion collisions produce abundant hyperons and nucleons. A dynamical coales- cence model coupled with the ART model is employed to study the production probabilities of light clusters, deuteron （d）, triton （t）, helion （3He）, and hypertriton （~H） at subthreshold energy of A production （= 1 GeV per nucleon）. We study the dependence on the reaction system size of the coalescence penalty factor per additional nucleon and entropy per nucleon. The Strangeness Population Factor （S3 =3H/（3He ×∧/p）） shows an extra suppression of hypertriton comparing to light clusters of the same mass number. This model predicts a hypertriton production cross-section of a few μb in ^36Ar＋^36Ar, ^40Ca＋^40Ca and ^56Ni＋^56Ni in 1 A GeV reactions. The production rate is as high as a few hypertritons per million collisions, which shows that the fixed-target heavy-ion collisions at CSR （Lanzhou/China） at A subthreshold energy are suitable for breaking new ground in hypernuclear physics.

关键词： hyperon hypernuclei dynamic coalescence

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Role of the Λ(1600) in the K^-p→Λπ^0π^0 reaction

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Communications in Theoretical Physics 2020年第4期72卷 64-70页

作者： He Zhou Ju-Jun Xie Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBejing 101408China School of Physics and Microelectronics Zhengzhou UniversityZhengzhouHenan 450001China

Role of theΛ(1600)is studied in the K^-p→Λπ^0π^0 reaction by using the effective Lagrangian approach near the *** perform a calculation for the total and differential cross sections by considering the contributions from theΛ(1600)andΛ(1670)intermediate resonances decaying intoπ^0∑^*0(1385)with∑^*0(1385)decaying intoπ^0Λ.Additionally,the non-resonance process from u-channel nucleon pole is also taken into *** our model parameters,the current experimental data on the total cross sections of the K^-p→Λπ^0π^0 reaction can be well *** is shown that we really need the contribution from the A(1600)with spin-parity J^P=1/2^+,and that these measurements can be used to determine some of the properties of theΛ(1600)***,we also plot theπ0Λinvariant mass distributions which could be tested by the future experimental measurements.

关键词： KN scattering effective Lagrangian approach hyperon resonance

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Nuclear Matter in a Chiral SU(3) Quark Mean-Field Model

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Communications in Theoretical Physics 2001年第7期36卷 71-78页

作者： WANG Ping ZHANG Zong-Ye YU You-Wen Institute of High Energy Physics Academia Sinica P.O. Box 918(4) Beijing 100039 China Institute of High Energy Physics Academia Sinica P.O. Box 918(4) Beijing 100039 China Institute of High Energy Physics Academia Sinica P.O. Box 918(4) Beijing 100039 China

A quark meson coupling model based on SU(3)L × SU(3)R symmetry and scale invariance is *** quarks and mesons get masses through symmetry broken. We apply this SU(3) chiral constituent quark model to investigating the nuclear matter at finite temperature and density. The effective baryon masses, compression modulus and hyperon potentials are all reasonable. The critical temperature ofliquid-gas phase transition is also calculated in this model.

关键词： chiral symmetry, constituent quark, nuclear matter, hyperon potentials

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Principles of Constructing a Correct Microscopic Theory

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Journal of Modern Physics 2020年第6期11卷 907-919页

作者： Boris V. Vasiliev Dubna Russia

In our time, experimental physicists have obtained data on a very large number of phenomena and objects of the physical world. Very rarely there is a situation when theoretical physicists do not have enough experimental data to understand some known fundamental law of Nature. This situation arose almost a hundred years ago and sparked a discussion between A. Einstein and N. Bohr on the probabilistic nature of microcosm phenomena. From the time, it seemed that most physicists are inclined to believe that the proponents of a quantum explanation of the randomness of the phenomena of radioactive decay are right. Now this problem has been solved experimentally. The results of these measurements [1] show that A. Einstein and other proponents of determinism were right. In most cases, theoretical models are based on some already existing experimental data and are intended to explain them. At the same time, in the twentieth century, among microscopic, well-mathematically based models, there were several that raise doubts about their correctness, since they cannot explain a number of other experimental data that can be attributed to the fundamentally important properties of the studied objects [2] [3]. Therefore, the usual criterion for the correctness of the theory, which consists of its agreement with the measurement data, is ambiguous in this case. An additional criterion for the correctness of a microscopic theory can be formulated if it is assumed that the microscopic theory must be quantum one. The coefficients of quantum equations are world constants. Therefore, the solutions of these equations must be equalities made up of world constants only. For this reason, a correct microscopic model must rely on equalities consisting of world constants only. This criterion is shown to work successfully for models of superfluidity and superconductivity, for models of a number of particles, and models of the star interior.

关键词： Beta-Decay Neutrino Nuclear Reactor Superfluidity Superconductivity Neutron hyperon Meson Star Interior

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Planck’s <i>h</i>and Structural Constant s<sub>0</sub>

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Journal of Modern Physics 2017年第3期8卷 425-438页

作者： Milan Perkovac University of Applied Sciences Zagreb Croatia

Application of Maxwell’s equations and the theory of relativity on the processes in atoms with real oscillator leads to the structural constant of atoms s0 = 8.278692517. Measurements show that the ratio of energy of the photon and its frequency is not constant which means that Planck’s h is not constant. The theory which is consistent with these measurements, has been found. This theory covers processes in electron configuration and also at the core of atoms. Based on the structural constant s0 the maximum possible atomic number Z is determined. In order to encompass all atoms and all nuclides a new measurement unit has been proposed. That is the measurement unit for the order of substance. The introduction of structural constant s0 makes 11 fundamental constants redundant, including Planck’s h. The structural constant of atoms s0 stands up as the most stable constant in a very wide range of measurement, so it may replace variable Planck’s h well. Continuity of the bremsstrahlung is explained.

关键词： Boscovich Bremsstrahlung hyperon Neutron Order of Substance Planck Redundant Constants Soddy Structural Constant

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