1995 Vol. 19, No. S3
Display Method:|
Abstract:
Two-particle correlations at small relative momenta have been measured for40Ar induced reactions on97Au atE/A=25 MeV. The relative populations of states of4He and8Be were extracted from p-t andα-αcorrelation functions, respectively. The temperature ofT=3.5±0.81.3MeV was obtained from relative populations of8Be states by correcting sequential decay carefully, and the temperature ofT=3.6±0.4 MeV was deduced by modifying the sequential decay yield with 30% on4Heg.s.ground state.
Two-particle correlations at small relative momenta have been measured for40Ar induced reactions on97Au atE/A=25 MeV. The relative populations of states of4He and8Be were extracted from p-t andα-αcorrelation functions, respectively. The temperature ofT=3.5±0.81.3MeV was obtained from relative populations of8Be states by correcting sequential decay carefully, and the temperature ofT=3.6±0.4 MeV was deduced by modifying the sequential decay yield with 30% on4Heg.s.ground state.
Abstract:
A new heavy neutron-rich isotope239Pa has been produced in the interaction of 50-MeV/u18O ions withnatU targets. Protactinium products were separated radiochemically from the complex mixture of the reaction products. The results observed from the decay of239Pa and its daughter,239U,show that the new heavy-rich isotope239Pa was synthesized and identified for the first time. The half-life of the239Pa was determined to be 106±30 min.
A new heavy neutron-rich isotope239Pa has been produced in the interaction of 50-MeV/u18O ions withnatU targets. Protactinium products were separated radiochemically from the complex mixture of the reaction products. The results observed from the decay of239Pa and its daughter,239U,show that the new heavy-rich isotope239Pa was synthesized and identified for the first time. The half-life of the239Pa was determined to be 106±30 min.
Abstract:
Production cross sections of target residues have been measured from the interaction of iron with 135-MeV/u12C ions, using nuclear chemistry techniques. Mass yield distribution was deduced from the measured cross sections on the basis of a Gaussian charge distribution function. We found that yields atA<30 mass region in this reaction were much higher than those in the reaction of 46 MeV/u12C+Cu, and those products were partial to neutron-excess. The experimental results were compared with calculations based on the statistical fusion fragmentation model and the modified sequential binary decay model, respectively. It seems to indicate that multifragmentation is one of the dominated reaction mechanisms responsible for production of the fragments with mass number ofA<30 at this incident energy.
Production cross sections of target residues have been measured from the interaction of iron with 135-MeV/u12C ions, using nuclear chemistry techniques. Mass yield distribution was deduced from the measured cross sections on the basis of a Gaussian charge distribution function. We found that yields atA<30 mass region in this reaction were much higher than those in the reaction of 46 MeV/u12C+Cu, and those products were partial to neutron-excess. The experimental results were compared with calculations based on the statistical fusion fragmentation model and the modified sequential binary decay model, respectively. It seems to indicate that multifragmentation is one of the dominated reaction mechanisms responsible for production of the fragments with mass number ofA<30 at this incident energy.
Abstract:
With Mountain Emulsion Chamber (MEC) data obtained from Mt. Kanbala, the relation between family flux and the energy spectrum of showers in the family is investigated. A Monte-Carlo generator can reproduce the main features of families. It indicated that no global change appeared in the hadronic interaction at the fragmentation region in the energy region from 1014to 1015eV.
With Mountain Emulsion Chamber (MEC) data obtained from Mt. Kanbala, the relation between family flux and the energy spectrum of showers in the family is investigated. A Monte-Carlo generator can reproduce the main features of families. It indicated that no global change appeared in the hadronic interaction at the fragmentation region in the energy region from 1014to 1015eV.
Abstract:
By using an 28 MeV/u18O beam, an on-line molten lead target equipment, and 4πΔEβ-γ coincident technique, the relative cross-section ratios and approximate absolute cross section for the neutron-rich nuclides205-208Hg have been measured; the probable existence of209Hg is observed and its production cross section is extrapolated. The cross section of207Hg produced by -2p+1n reaction from the target nucleus depresses suddenly, which may be explained by the variation of reactionQvalue.
By using an 28 MeV/u18O beam, an on-line molten lead target equipment, and 4πΔEβ-γ coincident technique, the relative cross-section ratios and approximate absolute cross section for the neutron-rich nuclides205-208Hg have been measured; the probable existence of209Hg is observed and its production cross section is extrapolated. The cross section of207Hg produced by -2p+1n reaction from the target nucleus depresses suddenly, which may be explained by the variation of reactionQvalue.
Abstract:
The identification ofτone-prong hadronic decay using a neural network is presented. Based on the identification, the branching ratios were measured as follows:Br(π/Kv)=(12.18±0.26±0.42)%,Br(π/Kπ0v)=(25.20±0.35±0.50)%,Br(π/K2π0v)=(8.88±0.37±0.38)%, Br(π/K3π0v)=(1.70±0.24±0.39)%.
The identification ofτone-prong hadronic decay using a neural network is presented. Based on the identification, the branching ratios were measured as follows:Br(π/Kv)=(12.18±0.26±0.42)%,Br(π/Kπ0v)=(25.20±0.35±0.50)%,Br(π/K2π0v)=(8.88±0.37±0.38)%, Br(π/K3π0v)=(1.70±0.24±0.39)%.
Abstract:
The removability of the topological term in the 2+1 dimensional CP1model is studied. Both the classical canonical transformation and quantum unitary transformation for the topological term are obtained. It is pointed out that, in order to give an answer to the question whether the topological term exists or not, one has to study not only the corresponding microscopic spin model but also the vacuum structure of the CP1model.
The removability of the topological term in the 2+1 dimensional CP1model is studied. Both the classical canonical transformation and quantum unitary transformation for the topological term are obtained. It is pointed out that, in order to give an answer to the question whether the topological term exists or not, one has to study not only the corresponding microscopic spin model but also the vacuum structure of the CP1model.
Abstract:
Using the method of an eigenvalue equation truncated according to the continuum limit, we calculate the vacuum state of 2+1-dimensionalSU(3) lattice gauge theory. The results are consistent with those computed through strong-coupling series in the strong coupling region, and display satisfactory scaling behavior in the weak coupling region.
Using the method of an eigenvalue equation truncated according to the continuum limit, we calculate the vacuum state of 2+1-dimensionalSU(3) lattice gauge theory. The results are consistent with those computed through strong-coupling series in the strong coupling region, and display satisfactory scaling behavior in the weak coupling region.
Abstract:
Using the statistical quark model and the experimental data of hadron yields, we investigate the production rate of quark pairs, the strangeness suppression factor and the ratio of baryon to meson in ppcollisions. The changes of these quantities with the energy √Sare obtained.
Using the statistical quark model and the experimental data of hadron yields, we investigate the production rate of quark pairs, the strangeness suppression factor and the ratio of baryon to meson in ppcollisions. The changes of these quantities with the energy √Sare obtained.
Abstract:
The interacting parton model is improved by including the interactions between all kinds of partons in the colliding hadrons and the evolution of parton momentum distribution functions with energy scale. The behaviors of inelasticity and cluster number at high energy are derived without distinguishing soft and hard contributions and without using explicit shape of the parton distribution function.
The interacting parton model is improved by including the interactions between all kinds of partons in the colliding hadrons and the evolution of parton momentum distribution functions with energy scale. The behaviors of inelasticity and cluster number at high energy are derived without distinguishing soft and hard contributions and without using explicit shape of the parton distribution function.
Abstract:
The two-loop effective potential of the non-topological soliton bag model at finite-temperature and -density is calculated. The influence of thermal effects on the vacuum structure is investigated.
The two-loop effective potential of the non-topological soliton bag model at finite-temperature and -density is calculated. The influence of thermal effects on the vacuum structure is investigated.
Abstract:
AnSO(17) unified model defined in ten dimensions is presented. The model is dimensionally reduced over the coset spaceSU(3)/U(l)×U/(1)×Z2, giving in four dimensions the standard model with three generations of light fermions.
AnSO(17) unified model defined in ten dimensions is presented. The model is dimensionally reduced over the coset spaceSU(3)/U(l)×U/(1)×Z2, giving in four dimensions the standard model with three generations of light fermions.
Abstract:
Based on the three-body model with Yukawa interactions, halo nuclei11Li,14Be and17B are further studied by the variational calculation. An analytical expression for the density distribution of the halo neutron is given. The theoretical results agree well with recent experimental data.
Based on the three-body model with Yukawa interactions, halo nuclei11Li,14Be and17B are further studied by the variational calculation. An analytical expression for the density distribution of the halo neutron is given. The theoretical results agree well with recent experimental data.
Abstract:
The shape of the emittance contour of a charged particle beam can be described by the contour function. In this paper the variance of the beam contour in nonlinear transport system is studied by means of the contour function theory and Lie algebra. Its inverse problem, the selection of parameters of the transport system according to the beam properties, can be studied also. As examples, the improvement of the beam quality by means of the nonlinear element and the beam matching in the nonlinear periodic field system are discussed.
The shape of the emittance contour of a charged particle beam can be described by the contour function. In this paper the variance of the beam contour in nonlinear transport system is studied by means of the contour function theory and Lie algebra. Its inverse problem, the selection of parameters of the transport system according to the beam properties, can be studied also. As examples, the improvement of the beam quality by means of the nonlinear element and the beam matching in the nonlinear periodic field system are discussed.
IF: 3.1
Monthly issued, founded in 1977
Sponsored by:
ISSN1674-1137 CN11-5641/O4
Original research articles, Ietters and reviews Covering theory and experiments in the fieids of
- Particle physics
- Nuclear physics
- Particle and nuclear astrophysics
- Cosmology
Author benefits
- A SCOAP3 participating journal - free Open Access publication for qualifying articles
- Average 24 days to first decision
- Fast-track publication for selected articles
- Subscriptions at over 3000 institutions worldwide
- Free English editing on all accepted articles
News
- CPC Announces 2025 Outstanding Reviewers
- Chinese Physics C Outstanding Reviewer Award 2023
- Impact factor of Chinese Physics C is 3.6 in 2022
- 2022 CPC Outstanding Reviewer Awards
- The 2023 Chinese New Year-Office closure
Cover Story
- Cover Story (Issue 2, 2026) |The images of Brans-Dicke-Kerr type naked singularities
- Cover Story (Issue 1, 2026) A focused review of quintom cosmology: from quintom dark energy to quintom bounce
- Cover Story (Issue 11, 2025) The Earth-Magnet Assists DAMPE in Studying Cosmic Anti-Electrons
- Cover Story (Issue 9, 2025): Precise measurement of Ïc0 resonance parameters and branching fractions of Ïc0,c2âÏï¼Ïï¼/ K+K-
- Cover Story (Issue 8, 2025) A Novel Perspective on Spacetime Perturbations: Bridging Riemannian and Teleparallel Frameworks
Advertising
