1996 Vol. 20, No. S1
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Abstract:
A new isotope 175Er was synthesized for the first time by the 176Yb(n,2p)175Er reaction in irradiation of natural metal ytterbium targets with 14 MeV neutrons. The activities of 175Er were observed by γ(X) ray spectroscopy. Eight new γ rays 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 the β decay of 175Er. A partial decay scheme of 175Er was proposed.
A new isotope 175Er was synthesized for the first time by the 176Yb(n,2p)175Er reaction in irradiation of natural metal ytterbium targets with 14 MeV neutrons. The activities of 175Er were observed by γ(X) ray spectroscopy. Eight new γ rays 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 the β decay of 175Er. A partial decay scheme of 175Er was proposed.
Abstract:
Particle-particle correlation functions have been measured for 40Ar+197Au collisions at E/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/c for low energy particles to about 100 fm/c for energetic particles.
Particle-particle correlation functions have been measured for 40Ar+197Au collisions at E/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/c for low energy particles to about 100 fm/c for energetic particles.
Abstract:
The yields of known hafnium isotopes produced in 6.3-24.6 MeV/nucleon 40Ar+natW reactions were determined by γ-ray spectroscopy following chemical separation. The excitation function, the FW value, and isotope distributions were obtained. It was deduced that using HIRFL energy heavy ions to synthesize new neutron-rich nuclides in the A > 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/nucleon 40Ar+natW reactions were determined by γ-ray spectroscopy following chemical separation. The excitation function, the FW value, and isotope distributions were obtained. It was deduced that using HIRFL energy heavy ions to synthesize new neutron-rich nuclides in the A > 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 of β-delayed proton decay of 65Se produced in the 40Ga(28Si,3n) reaction, the absolute detection efficiency of particle telescope for rotating radioactive source was fitted and calculated. The half-life of 65Se was thus accurately determined to be 9.6-4.1+5.3 ms and its β-delayed proton energy of 65Se was 3.70±0.08MeV. The partial decay scheme of 65Se β-delayed proton decay was revised.
By using experimental data obtained from the measurement of β-delayed proton decay of 65Se produced in the 40Ga(28Si,3n) reaction, the absolute detection efficiency of particle telescope for rotating radioactive source was fitted and calculated. The half-life of 65Se was thus accurately determined to be 9.6-4.1+5.3 ms and its β-delayed proton energy of 65Se was 3.70±0.08MeV. The partial decay scheme of 65Se β-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, 400 μm), a large area PIN Silicon Photodiode (SPD) (48 mm×48 mm, 300 μm),and a 16 element CsI(Tl) scintillation detector array. The energy resolutions for IC and PSSD tested with a source 241Am(5.486 MeV) are 3% and 2.6%, respectively. The energy dynamic range for α particle detection is about 2-130 MeV, and the fragments with Z Values from Z=2 to Z=21 are identified in the reaction of 25 MeV/u 40Ar+ 115In. The Z resolving power is Z/△Z ≈ 44.5 (FWHM) for Z=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, 400 μm), a large area PIN Silicon Photodiode (SPD) (48 mm×48 mm, 300 μm),and a 16 element CsI(Tl) scintillation detector array. The energy resolutions for IC and PSSD tested with a source 241Am(5.486 MeV) are 3% and 2.6%, respectively. The energy dynamic range for α particle detection is about 2-130 MeV, and the fragments with Z Values from Z=2 to Z=21 are identified in the reaction of 25 MeV/u 40Ar+ 115In. The Z resolving power is Z/△Z ≈ 44.5 (FWHM) for Z=18. The position resolution of PSSD is 0.86±0.03 mm (FWHM).
Abstract:
A new neutron-deficient isotope235Am was synthesized in the reaction of 238Pu(p,4n)235Am by using 35 MeV proton bombarding 238Pu target. The products were transported by the He-jet system. The Am was separated from the reaction products using the radiochemistry method. The γ-ray of 235Pu and X-ray of Np following the EC decay of 235Am were observed. Based on the growth-decay curve of X-ray of Np and the X-γ coincidence measurements, the synthesis of 235Am was confirmed for the first time. The measured half-life of 235Am is 15 ±5 min.
A new neutron-deficient isotope235Am was synthesized in the reaction of 238Pu(p,4n)235Am by using 35 MeV proton bombarding 238Pu target. The products were transported by the He-jet system. The Am was separated from the reaction products using the radiochemistry method. The γ-ray of 235Pu and X-ray of Np following the EC decay of 235Am were observed. Based on the growth-decay curve of X-ray of Np and the X-γ coincidence measurements, the synthesis of 235Am was confirmed for the first time. The measured half-life of 235Am is 15 ±5 min.
Abstract:
We construct explicitly the two-dimensional cyclic representation of quantum algebra Uq(sl(2)) with q=i and z central 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-vertex R-matrix that satisfies the free-Fermion condition and therefore gives an integrable model.
We construct explicitly the two-dimensional cyclic representation of quantum algebra Uq(sl(2)) with q=i and z central 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-vertex R-matrix that satisfies the free-Fermion condition and therefore gives an integrable model.
Abstract:
A two-parameter qp-deformed two-dimensional interacting boson model (IBM) with the quantum symmetry Uqp(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-parameter qp-deformed two-dimensional interacting boson model (IBM) with the quantum symmetry Uqp(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 energy Ep of U(1) lattice gauge theory (LGT) in three dimensions is calculated using the variational cumulant expansion (VCE) with the independent plaquette effective action. The Ep-β curve is continuous, which shows that the U(l) theory is confined. Our result is consistent with Monte Carlo (MC) data.
The plaquette internal energy Ep of U(1) lattice gauge theory (LGT) in three dimensions is calculated using the variational cumulant expansion (VCE) with the independent plaquette effective action. The Ep-β curve is continuous, which shows that the U(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, CN2 and CN3 are deduced for the self-similar analysis of a 2-dimensional self-affine fractal object with Hurst exponent H=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, CN2 and CN3 are deduced for the self-similar analysis of a 2-dimensional self-affine fractal object with Hurst exponent H=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 the 20Ne+12C system are analyzed and the excitation functions and the angular distributions of the 20Ne+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 the 20Ne+12C elastic scattering.
In this paper, the basic features exhibited by the 20Ne+12C system are analyzed and the excitation functions and the angular distributions of the 20Ne+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 the 20Ne+12C elastic scattering.
Abstract:
Properties of the low-lying positive-parity states in 157, 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 that 157Tm and 159Tm may be triaxiality. Furthermore, it is suggested that an excitation rotational band in 157Tm probably already exists in the experimental data.
Properties of the low-lying positive-parity states in 157, 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 that 157Tm and 159Tm may be triaxiality. Furthermore, it is suggested that an excitation rotational band in 157Tm probably already exists in the experimental data.
Abstract:
The ground state properties of the doubly-magic nucleus 100Sn were calculated with the Skyrme-Hatree-Fock method. There may be a proton skin in the 100Sn nucleus due to the Coulomb repulsion.
The ground state properties of the doubly-magic nucleus 100Sn were calculated with the Skyrme-Hatree-Fock method. There may be a proton skin in the 100Sn nucleus due to the Coulomb repulsion.
Abstract:
The matrix elements of the M-3Y force are adopted as equivalent G-matrix elements and the folded diagram method is used to calculate the spectra of 210Pb, 206Pb, 206Hg, and 210Po. Results show that the matrix elements of the M-3Y force as equivalent G-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 equivalent G-matrix elements and the folded diagram method is used to calculate the spectra of 210Pb, 206Pb, 206Hg, and 210Po. Results show that the matrix elements of the M-3Y force as equivalent G-matrix elements are suitable for the microscopic calculations of the nuclear structure in the heavy nucleus region.
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