The levels in neutron-rich odd-A ^(107,109)Ru nuclei have been investigated by using γ -γ -and γ -γ -γ-coincidence studies of the prompt γ-rays from the spontaneous fission of 252Cf. The ground state bands and t...The levels in neutron-rich odd-A ^(107,109)Ru nuclei have been investigated by using γ -γ -and γ -γ -γ-coincidence studies of the prompt γ-rays from the spontaneous fission of 252Cf. The ground state bands and the negative parity bands are identified and expanded in both nuclei. Triaxial rotor plus particle model calculations indicate the ground state bands originate from v(d_(5/2)+g_(7/2)) quasiparticle configurations and the negative parity bands are from vh_(11/2) orbital.展开更多
The binding energy spectra and the momentum distributions of the valence orbitals of iso-butane, also known as methylpropane (CH_(3)CH(CH_(3))CH_(3)), are studied by using a high resolution binary (e, 2e) electron mom...The binding energy spectra and the momentum distributions of the valence orbitals of iso-butane, also known as methylpropane (CH_(3)CH(CH_(3))CH_(3)), are studied by using a high resolution binary (e, 2e) electron momentum spectrometer, at an impact energy of 1200eV plus the binding energy (8-32eV) with symmetric non-coplanar kinematics. Binding energy spectra of the valence shell are obtained at a coincidence energy resolution of 0.95 eV in full width at halfmaximum. The experimental momentum profiles of the inner valence orbitals are obtained and compared with the theoretical momentum distributions calculated by using Hartree-Fock and density functional theory methods with the basis sets 6-31G and 6-311++G**. The pole strengths of the inner orbitals are estimated and the final correlation effects are discussed.展开更多
High spin states in 138Ce have been investigated following heavy-ion induced reactions carried out at the China Institute of Atomic Energy,Beijing.Two collective rotational bands were established for the first time.Th...High spin states in 138Ce have been investigated following heavy-ion induced reactions carried out at the China Institute of Atomic Energy,Beijing.Two collective rotational bands were established for the first time.These two bands show oblate deformation withγ=-60°and probably originate from the four quasiparticle configurationsπg7/2πh11/2Uvh11/2 vd3/2 andπg7/2Uπh11/2[vh11/2]2,respectively.These oblate bands exhibit strong M1 transitions,no signature splitting and different moments of inertia from those of prolate bands.展开更多
The valence electron binding energy spectra and orbital electron momentum distributions of ethane(C2H6)have been measured by high resolution(ΔE=0.9eV,Δp=0.1 a.u.)symmetric non-coplanar electron momentum spectroscopy...The valence electron binding energy spectra and orbital electron momentum distributions of ethane(C2H6)have been measured by high resolution(ΔE=0.9eV,Δp=0.1 a.u.)symmetric non-coplanar electron momentum spectroscopy,at an impact energy of 1200eV+binding energy.The high energy resolution is adequate for us to be observe clearly the separated valence orbitals of C_(2)H_(6).展开更多
The measurements of the valence shell ionisation energy spectra(6-32eV)for propane(C_(3)H_(8))by high resolution(ΔE=0.9eV andΔp=0.1 a.u.)(e,2e)spectrometer at impact energy of 1200eV plus binding energy and symmetri...The measurements of the valence shell ionisation energy spectra(6-32eV)for propane(C_(3)H_(8))by high resolution(ΔE=0.9eV andΔp=0.1 a.u.)(e,2e)spectrometer at impact energy of 1200eV plus binding energy and symmetric noncoplanar kinematics are reported.The spectrum is consistent with a single particle picture of ionization from each of the seven outer-valence orbitals and the three inner-valence orbitals.The ionization energies are in agreement with published photoelectron spectroscopy data.展开更多
Accurate measurements of the binding energy spectrum and momentum distribution of argon areperformed using the high resolution(ΔE=1.4 eV,Δp=0.1 a.u.)energy multichannel(e,2e)spectrometer(θ_(1)=θ_(2)=45°,j=0&#...Accurate measurements of the binding energy spectrum and momentum distribution of argon areperformed using the high resolution(ΔE=1.4 eV,Δp=0.1 a.u.)energy multichannel(e,2e)spectrometer(θ_(1)=θ_(2)=45°,j=0°-±30°)built recently in our laboratory.Detailed satellite structure of argon has been observed.Good agreement can be found between the experimental data and the theoretical calculations performed using Hartree-Fock method with the different basis sets and configuration interaction method.展开更多
The first extensive electron momentum spectroscopy study of the satellite structure in the inner valence region of methane at 1200eV is reported.The experimental momentum profiles belonging to the(2a_(1))^(-1) satelli...The first extensive electron momentum spectroscopy study of the satellite structure in the inner valence region of methane at 1200eV is reported.The experimental momentum profiles belonging to the(2a_(1))^(-1) satellite state are presented at energies 25.3,28.5,31.5,35.5eV,and compared with the 146-G(CI)calculation.展开更多
Level schemes for the neutron-rich ^(140,143)Ba nuclei have been determined by study of promptγ-rays in spontaneous fission of ^(252)Cf.The level pattern and enhanced E1 transitions betweenπ=+andπ=-bands show refle...Level schemes for the neutron-rich ^(140,143)Ba nuclei have been determined by study of promptγ-rays in spontaneous fission of ^(252)Cf.The level pattern and enhanced E1 transitions betweenπ=+andπ=-bands show reflection asymmetric shapes with simplex quantum number s=+1 in ^(140)Ba and s=±i in ^(143)Ba,respectively.The octupole deformation stability with spin variation has been discussed.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.19775026the Science Foundation for Nuclear Industry of China under Grant No.Y7197AY509the U.S.Department of Energy under Grant Nos.DE-FG05-88ER40407 and DE-FG03-87ER40323.
文摘The levels in neutron-rich odd-A ^(107,109)Ru nuclei have been investigated by using γ -γ -and γ -γ -γ-coincidence studies of the prompt γ-rays from the spontaneous fission of 252Cf. The ground state bands and the negative parity bands are identified and expanded in both nuclei. Triaxial rotor plus particle model calculations indicate the ground state bands originate from v(d_(5/2)+g_(7/2)) quasiparticle configurations and the negative parity bands are from vh_(11/2) orbital.
基金Supported by the NationalNatural Science Foundation of China under Grant Nos.19774037 and 19854002the foundation of Cao Guangbiao High-Tech Development of Tsinghua University.
文摘The binding energy spectra and the momentum distributions of the valence orbitals of iso-butane, also known as methylpropane (CH_(3)CH(CH_(3))CH_(3)), are studied by using a high resolution binary (e, 2e) electron momentum spectrometer, at an impact energy of 1200eV plus the binding energy (8-32eV) with symmetric non-coplanar kinematics. Binding energy spectra of the valence shell are obtained at a coincidence energy resolution of 0.95 eV in full width at halfmaximum. The experimental momentum profiles of the inner valence orbitals are obtained and compared with the theoretical momentum distributions calculated by using Hartree-Fock and density functional theory methods with the basis sets 6-31G and 6-311++G**. The pole strengths of the inner orbitals are estimated and the final correlation effects are discussed.
基金the National Natural Science Foundation of China under Grant No.19775026the Science Foundation for the Nuclear Industry of China under Grant No.Y7192AY509.
文摘High spin states in 138Ce have been investigated following heavy-ion induced reactions carried out at the China Institute of Atomic Energy,Beijing.Two collective rotational bands were established for the first time.These two bands show oblate deformation withγ=-60°and probably originate from the four quasiparticle configurationsπg7/2πh11/2Uvh11/2 vd3/2 andπg7/2Uπh11/2[vh11/2]2,respectively.These oblate bands exhibit strong M1 transitions,no signature splitting and different moments of inertia from those of prolate bands.
基金Supported by the National Natural Science Foundation of China under Grant No.19474029the Postdoctoral Science Foundation of China。
文摘The valence electron binding energy spectra and orbital electron momentum distributions of ethane(C2H6)have been measured by high resolution(ΔE=0.9eV,Δp=0.1 a.u.)symmetric non-coplanar electron momentum spectroscopy,at an impact energy of 1200eV+binding energy.The high energy resolution is adequate for us to be observe clearly the separated valence orbitals of C_(2)H_(6).
基金Supported by the National Natural Science Foundation of China under Grant No.19474029the Postdoctoral Science Foundation of China.
文摘The measurements of the valence shell ionisation energy spectra(6-32eV)for propane(C_(3)H_(8))by high resolution(ΔE=0.9eV andΔp=0.1 a.u.)(e,2e)spectrometer at impact energy of 1200eV plus binding energy and symmetric noncoplanar kinematics are reported.The spectrum is consistent with a single particle picture of ionization from each of the seven outer-valence orbitals and the three inner-valence orbitals.The ionization energies are in agreement with published photoelectron spectroscopy data.
基金Supported by the National Natural Science Foundation of China under Grant No.19474029.
文摘Accurate measurements of the binding energy spectrum and momentum distribution of argon areperformed using the high resolution(ΔE=1.4 eV,Δp=0.1 a.u.)energy multichannel(e,2e)spectrometer(θ_(1)=θ_(2)=45°,j=0°-±30°)built recently in our laboratory.Detailed satellite structure of argon has been observed.Good agreement can be found between the experimental data and the theoretical calculations performed using Hartree-Fock method with the different basis sets and configuration interaction method.
基金Supported by the National Natural Science Foundation of China under Grant No.19474029
文摘The first extensive electron momentum spectroscopy study of the satellite structure in the inner valence region of methane at 1200eV is reported.The experimental momentum profiles belonging to the(2a_(1))^(-1) satellite state are presented at energies 25.3,28.5,31.5,35.5eV,and compared with the 146-G(CI)calculation.
基金Supported by the National Natural Science Foundation of China under Grant No.19375029the Science Foundation for Nuclear Industry,China under Grant No.J94AY5072the U.S.Department of Energy under Grant Nos.DE-FG05-88ER40407 and DE-FG03-87ER40323.
文摘Level schemes for the neutron-rich ^(140,143)Ba nuclei have been determined by study of promptγ-rays in spontaneous fission of ^(252)Cf.The level pattern and enhanced E1 transitions betweenπ=+andπ=-bands show reflection asymmetric shapes with simplex quantum number s=+1 in ^(140)Ba and s=±i in ^(143)Ba,respectively.The octupole deformation stability with spin variation has been discussed.
