1994 Vol. 18, No. S1
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A new rotational band has been identified in the reaction of 28Si+92Mo by means of in beam γ-ray methods.It is considered as the possible h11/2 proton band of 117Cs,through a careful analysis of its intensity and level characters.
The decay properties of excited nuclei corresponding to about 3MeV/u excitation energy formed in incomplete fusion reactions 40Ar(25MeV/u)+209Bi、197Au、159Tb are analysed.The sequential decay of nuclei by large fragments is identified using a minimization procedure of relative velocity difference with coulomb repulsion velocity.It is shown that three fragments originate from two successive independent binary splittings.This result is also supportted by the fact,that the experimental angular distribution of ternary fragments is nicely reproduced by sequential decay.
A multitelescope system for measurement of double-differential cross-sections for the (neutron,charged particle)reactions is designed.The system consists of two ΔE multiwire proportional chambers and a central CsI(Tl) energy detector.Fastslow triple-coincidence was used to select all signals.An electronics system for acquiring five-parameters for the products from the (neutron,charged particle)reaction was established.The system allows simultaneous measurements of the energy spectra of charged particles at 16 reaction angles from 30°—160°and the background spectra.
Three fragments emitted from the decay of hot nuclei formed in central collision of 25MeV/u 40Ar with 159Tb、197Au、209Bi were measured coincidently.In these cases,the corresponding excitation energy of hot nuclei is about 3MeV/u.The distributions of the mass,the relative angle and relative velocities are obtained by correlation measurement.The probability ratio of ternary fission relative to binary fission in detector space has been modified to 4π geometry in terms of Monte-Carlo method.
With the powerful multidetector system of In-beam γ-ray experiment,γ-lines following the β+/EC decay of 198Bi nucleus have been investigated using comprehensive (γ-γ-t) coincidences in in-beam conditions.Five new transitions of 198Pb were observed and eight energy levels were established.
Amorphous alloys Fe39Ni
At the first stage the Radioactive Ions Beam Line in Lanzhou (RIBLL) is a Projectile Fragmentation (PF) type RNB facility,in which neutron-rich and protonrich RNB are produced by means of the energitic projectile fragmentation at around 0°.The mechanisms of RNB production,seperation,transportation and identification are introduced; the stucture and characteristics of this system are describted.The results of test run are also reported in this paper.
In the frame of the multichannel fission model with the random neck rupture,the fragment yield and total kinetic energy distributions of the neutron induced 235U(n,f) fission covering the incident neutron energy range from 0 to 6MeV are calculated.The change of channel probabilities with the neutron incident energy is obtained by fitting experimental data.The theoretical results are in accord with the experimental data.
The momentum- and density-dependent coupling constants for scalar and vector fields are proposed.The saturation properties of the nuclear matter,the experimantal data of the energy-dependent optical potential and the mean free path in nuclei can be reproduced simultaneously.The in-medium n-n elastic cross section has been calculated for different densities and energies.The results show that it is important to take the density dependence of the n-n cross section into account.
The QMD model is coupled with the restructured aggregation model(RMA),which is named as improved QMD (IQMD).By IQMD,the influences of the medium effect,momentum dependent interaction and the equations of state on the multifragmention process at different beam energies have been investigated.
The channel theory of fission with diffusive dynamics is proposed based on Borh channel theory of fission and Fokker-Planck equation.
The Low-lying states and electromagnetic transitions of 208Tl has been calculated in the framework of large basis shell model.The theoretical results are in good agreement with the experimental data.It shows that MSDI may be used nicely to describe the properties of 208Tl.The logft1/2 values of 208Hg are estimated.
The quadrupole excitations in nucleus 11Li have been studied within the nuclear Vlasov equation approach.The classical phase space distribution function is given by the test particle propagation method.A soft mode of quadrupole excitation located around 2MeV is found.The total percent of E2 energy-Weighted sum rule (EWSR) exhausted in this soft resonance region is very sensitive to the extension of neutron halo in nucleus 11Li.The results compared with other recent calculations are analyzed.
The data of α-particle induced reactions on 10,11B at 31.2MeV have been analyzed by using the programm MARS-SATURN EFR-DWBA method.The results are shown that direct stripping reactions are the main reaction mechanism in most of 10,11B(α,x)*C reactions.However,there is direct stripping plus heavy particle stripping in the reactions 11B(α,d0)13C and 11B(α,p0)14C.In addition,the mechanism of compound nucleus seems to be taken into account for the peak of intermediate angular region in the reaction 11B(α,p0)14C.Finally,the agreement between theoretical calculation and experimental data is satisfactory in those reactions:10B(α,p0)13C,10B(α,d1)12C* and 11B(α,d0)13C.
The relation between the intrinsic properties of nucleus and the energy storage in HIC at intermediate energies has been discussed on the basis of BUU model.The calculated results show that the effective mass m*/m influences strongly the energy storage and the thermalization process,and the effect of incompressibility coefficient K on the energy storage is not strong than that of m*/m.
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