1996 Vol. 20, No. S1
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Abstract:
A new isotope175Er was synthesized for the first time by the176Yb(n,2p)175Er reaction in irradiation of natural metal ytterbium targets with 14 MeV neutrons. The activities of175Er were observed byγ(X) ray spectroscopy. Eight newγrays of 76.5, 120.9, 123.7, 128.5,227.3,234.0,281.4, and 1167.5 keV with half-life of 1.2±0.3 min were found and assigned to theβdecay of175Er. A partial decay scheme of175Er was proposed.
A new isotope175Er was synthesized for the first time by the176Yb(n,2p)175Er reaction in irradiation of natural metal ytterbium targets with 14 MeV neutrons. The activities of175Er were observed byγ(X) ray spectroscopy. Eight newγrays of 76.5, 120.9, 123.7, 128.5,227.3,234.0,281.4, and 1167.5 keV with half-life of 1.2±0.3 min were found and assigned to theβdecay of175Er. A partial decay scheme of175Er was proposed.
Abstract:
Particle-particle correlation functions have been measured for40Ar+197Au collisions atE/A=25 MeV. Emission time of light particles has been extracted from correlation functions using the three-body trajectory model. The average emission time varies with the energy of particles. It decreases from about 300 fm/cfor low energy particles to about 100 fm/cfor energetic particles.
Particle-particle correlation functions have been measured for40Ar+197Au collisions atE/A=25 MeV. Emission time of light particles has been extracted from correlation functions using the three-body trajectory model. The average emission time varies with the energy of particles. It decreases from about 300 fm/cfor low energy particles to about 100 fm/cfor energetic particles.
Abstract:
The yields of known hafnium isotopes produced in 6.3-24.6 MeV/nucleon40Ar+natW reactions were determined byγ-ray spectroscopy following chemical separation. The excitation function, theFWvalue, and isotope distributions were obtained. It was deduced that using HIRFL energy heavy ions to synthesize new neutron-rich nuclides in theA> 170 region is possible. Using thick target or multi-thin target can obviously increase the yield of a new neutron-rich nuclide. Increasing projectile energy is not always helpful to synthesize a new neutron-rich nuclide.
The yields of known hafnium isotopes produced in 6.3-24.6 MeV/nucleon40Ar+natW reactions were determined byγ-ray spectroscopy following chemical separation. The excitation function, theFWvalue, and isotope distributions were obtained. It was deduced that using HIRFL energy heavy ions to synthesize new neutron-rich nuclides in theA> 170 region is possible. Using thick target or multi-thin target can obviously increase the yield of a new neutron-rich nuclide. Increasing projectile energy is not always helpful to synthesize a new neutron-rich nuclide.
Abstract:
By using experimental data obtained from the measurement ofβ-delayed proton decay of65Se produced in the40Ga(28Si,3n) reaction, the absolute detection efficiency of particle telescope for rotating radioactive source was fitted and calculated. The half-life of65Se was thus accurately determined to be 9.6-4.1+5.3ms and itsβ-delayed proton energy of65Se was 3.70±0.08MeV. The partial decay scheme of65Seβ-delayed proton decay was revised.
By using experimental data obtained from the measurement ofβ-delayed proton decay of65Se produced in the40Ga(28Si,3n) reaction, the absolute detection efficiency of particle telescope for rotating radioactive source was fitted and calculated. The half-life of65Se was thus accurately determined to be 9.6-4.1+5.3ms and itsβ-delayed proton energy of65Se was 3.70±0.08MeV. The partial decay scheme of65Seβ-delayed proton decay was revised.
Abstract:
A two-dimensional position sensitive multi-stage detection system with a wide dynamic range for a heavy ion reaction is described in this paper. It consists of four parts:a longitudinal electric field gas filled Ionization Chamber (IC), a Position Sensitive Silicon Detector (PSSD) (45 mm×45 mm, 400μm), a large area PIN Silicon Photodiode (SPD) (48 mm×48 mm, 300μm),and a 16 element CsI(Tl) scintillation detector array. The energy resolutions for IC and PSSD tested with a source241Am(5.486 MeV) are 3% and 2.6%, respectively. The energy dynamic range forαparticle detection is about 2-130 MeV, and the fragments withZValues fromZ=2 toZ=21 are identified in the reaction of 25 MeV/u40Ar+115In. TheZresolving power isZ/△Z≈ 44.5 (FWHM) forZ=18. The position resolution of PSSD is 0.86±0.03 mm (FWHM).
A two-dimensional position sensitive multi-stage detection system with a wide dynamic range for a heavy ion reaction is described in this paper. It consists of four parts:a longitudinal electric field gas filled Ionization Chamber (IC), a Position Sensitive Silicon Detector (PSSD) (45 mm×45 mm, 400μm), a large area PIN Silicon Photodiode (SPD) (48 mm×48 mm, 300μm),and a 16 element CsI(Tl) scintillation detector array. The energy resolutions for IC and PSSD tested with a source241Am(5.486 MeV) are 3% and 2.6%, respectively. The energy dynamic range forαparticle detection is about 2-130 MeV, and the fragments withZValues fromZ=2 toZ=21 are identified in the reaction of 25 MeV/u40Ar+115In. TheZresolving power isZ/△Z≈ 44.5 (FWHM) forZ=18. The position resolution of PSSD is 0.86±0.03 mm (FWHM).
Abstract:
A new neutron-deficient isotope235Am was synthesized in the reaction of238Pu(p,4n)235Am by using 35 MeV proton bombarding238Pu target. The products were transported by the He-jet system. The Am was separated from the reaction products using the radiochemistry method. Theγ-ray of235Pu and X-ray of Np following the EC decay of235Am were observed. Based on the growth-decay curve of X-ray of Np and the X-γcoincidence measurements, the synthesis of235Am was confirmed for the first time. The measured half-life of235Am is 15 ±5 min.
A new neutron-deficient isotope235Am was synthesized in the reaction of238Pu(p,4n)235Am by using 35 MeV proton bombarding238Pu target. The products were transported by the He-jet system. The Am was separated from the reaction products using the radiochemistry method. Theγ-ray of235Pu and X-ray of Np following the EC decay of235Am were observed. Based on the growth-decay curve of X-ray of Np and the X-γcoincidence measurements, the synthesis of235Am was confirmed for the first time. The measured half-life of235Am is 15 ±5 min.
Abstract:
We construct explicitly the two-dimensional cyclic representation of quantum algebraUq(sl(2)) withq=iandzcentral extension. The representation is irreducible and we write down explicitly the Clebsch-Gordan coefficients and the intertwiner of tensor representations in different orders. This intertwiner turns out to be an 8-vertexR-matrix that satisfies the free-Fermion condition and therefore gives an integrable model.
We construct explicitly the two-dimensional cyclic representation of quantum algebraUq(sl(2)) withq=iandzcentral extension. The representation is irreducible and we write down explicitly the Clebsch-Gordan coefficients and the intertwiner of tensor representations in different orders. This intertwiner turns out to be an 8-vertexR-matrix that satisfies the free-Fermion condition and therefore gives an integrable model.
Abstract:
A two-parameterqp-deformed two-dimensional interacting boson model (IBM) with the quantum symmetryUqp(U3)⊃Uqp(U2)⊃Uqp(SO2) is constructed. It is found that the energy spectra and the transition matrix elements depend very sensitively on the second parameter of deformation.
A two-parameterqp-deformed two-dimensional interacting boson model (IBM) with the quantum symmetryUqp(U3)⊃Uqp(U2)⊃Uqp(SO2) is constructed. It is found that the energy spectra and the transition matrix elements depend very sensitively on the second parameter of deformation.
Abstract:
The plaquette internal energyEpofU(1) lattice gauge theory (LGT) in three dimensions is calculated using the variational cumulant expansion (VCE) with the independent plaquette effective action. TheEp-βcurve is continuous, which shows that theU(l) theory is confined. Our result is consistent with Monte Carlo (MC) data.
The plaquette internal energyEpofU(1) lattice gauge theory (LGT) in three dimensions is calculated using the variational cumulant expansion (VCE) with the independent plaquette effective action. TheEp-βcurve is continuous, which shows that theU(l) theory is confined. Our result is consistent with Monte Carlo (MC) data.
Abstract:
Using the Feynman path integral method, we calculate the Casimir effect of QCD with massive fermion loop contribution between two parallel ideal conducting wires at zero temperature.
Using the Feynman path integral method, we calculate the Casimir effect of QCD with massive fermion loop contribution between two parallel ideal conducting wires at zero temperature.
Abstract:
On the basis of the generalized invariant theory, the invariant-related unitary transformation method is developed and used to study the evolution of the third-quantized wave functions of the universe. The expressions for the phases and the wave functions are obtained. Then, by means of the construction of the coherent state, the solutions of the Wheeler-DeW itt equation and the quantum fluctuations caused by the third quantization are found.
On the basis of the generalized invariant theory, the invariant-related unitary transformation method is developed and used to study the evolution of the third-quantized wave functions of the universe. The expressions for the phases and the wave functions are obtained. Then, by means of the construction of the coherent state, the solutions of the Wheeler-DeW itt equation and the quantum fluctuations caused by the third quantization are found.
Abstract:
The self-affine cascading model of 2-dimensional phase space is discussed in some detail. The analytical expression for the scaled probability inoments,CN2andCN3are deduced for the self-similar analysis of a 2-dimensional self-affine fractal object with Hurst exponentH=0.5. The Levy stability indices of the model are calculated analytically. It is shown that the results of Levy indices from the Monte Carlo simulation are consistent with those from the analytical calculation. The recent experimental data from NA22 collaboration are explained qualitatively.
The self-affine cascading model of 2-dimensional phase space is discussed in some detail. The analytical expression for the scaled probability inoments,CN2andCN3are deduced for the self-similar analysis of a 2-dimensional self-affine fractal object with Hurst exponentH=0.5. The Levy stability indices of the model are calculated analytically. It is shown that the results of Levy indices from the Monte Carlo simulation are consistent with those from the analytical calculation. The recent experimental data from NA22 collaboration are explained qualitatively.
Abstract:
In this paper, the basic features exhibited by the20Ne+12C system are analyzed and the excitation functions and the angular distributions of the20Ne+12C elastic scattering are well reproduced on the basis of the nuclear molecular orbital theory. The results show that the double-alpha transfer effect for a deep optical potential is responsible for the basic features in the excitation functions of the20Ne+12C elastic scattering.
In this paper, the basic features exhibited by the20Ne+12C system are analyzed and the excitation functions and the angular distributions of the20Ne+12C elastic scattering are well reproduced on the basis of the nuclear molecular orbital theory. The results show that the double-alpha transfer effect for a deep optical potential is responsible for the basic features in the excitation functions of the20Ne+12C elastic scattering.
Abstract:
Properties of the low-lying positive-parity states in157, 159Tm have been investigated by using the triaxial rotor plus particle model with the variable moment of inertia (VMI) of the core. The good agreement between theory and experiment shows that157Tm and159Tm may be triaxiality. Furthermore, it is suggested that an excitation rotational band in157Tm probably already exists in the experimental data.
Properties of the low-lying positive-parity states in157, 159Tm have been investigated by using the triaxial rotor plus particle model with the variable moment of inertia (VMI) of the core. The good agreement between theory and experiment shows that157Tm and159Tm may be triaxiality. Furthermore, it is suggested that an excitation rotational band in157Tm probably already exists in the experimental data.
Abstract:
The ground state properties of the doubly-magic nucleus100Sn were calculated with the Skyrme-Hatree-Fock method. There may be a proton skin in the100Sn nucleus due to the Coulomb repulsion.
The ground state properties of the doubly-magic nucleus100Sn were calculated with the Skyrme-Hatree-Fock method. There may be a proton skin in the100Sn nucleus due to the Coulomb repulsion.
Abstract:
The matrix elements of the M-3Y force are adopted as equivalentG-matrix elements and the folded diagram method is used to calculate the spectra of210Pb,206Pb,206Hg, and210Po. Results show that the matrix elements of the M-3Y force as equivalentG-matrix elements are suitable for the microscopic calculations of the nuclear structure in the heavy nucleus region.
The matrix elements of the M-3Y force are adopted as equivalentG-matrix elements and the folded diagram method is used to calculate the spectra of210Pb,206Pb,206Hg, and210Po. Results show that the matrix elements of the M-3Y force as equivalentG-matrix elements are suitable for the microscopic calculations of the nuclear structure in the heavy nucleus region.
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