High-spin states of^(119)Xe have been investigated by in-beam γ-ray spectroscopy via the reaction of ^(16)O bombarding a ^(106)Cd target at beam energies of 67-80MeV. No enhanced E1 transition was observed, the non-e...High-spin states of^(119)Xe have been investigated by in-beam γ-ray spectroscopy via the reaction of ^(16)O bombarding a ^(106)Cd target at beam energies of 67-80MeV. No enhanced E1 transition was observed, the non-existence of octupole correlations in ^(119) Xe.展开更多
Two low-lying isomeric states in 169Ta have been identified via ^(159)Tb(l6O,6nγ)^(169)Ta reaction.Their half-lives are measured to be 28±5ns for the 9/2^(-)level and 17±4 ns for the 5/2^(-)level by using t...Two low-lying isomeric states in 169Ta have been identified via ^(159)Tb(l6O,6nγ)^(169)Ta reaction.Their half-lives are measured to be 28±5ns for the 9/2^(-)level and 17±4 ns for the 5/2^(-)level by using the delayedγ-γcoincidence method.These two isomeric states are considered to be the bandheads with 9/2-[514]and 1/2-[541]configurations,respectively.Possible neutron quasiparticle configuration for the ground state of ^(169)W is discussed.展开更多
High spin states of the odd-odd ^(162)Lu nucleus have been studied via ^(147)Sm(^(19)F,4nγ)reaction at 95MeV beam energy.Level scheme for yrast band based on π[h_(11/2)]v[i_(13/2)]quasiparticle configuration was est...High spin states of the odd-odd ^(162)Lu nucleus have been studied via ^(147)Sm(^(19)F,4nγ)reaction at 95MeV beam energy.Level scheme for yrast band based on π[h_(11/2)]v[i_(13/2)]quasiparticle configuration was established up to I^(π)-(23^(-))for the first time.This band shows the signature inversion in energy before backbending generally appeared in this mass region.It is stressed that the signature splitting in 162Lu is larger than that in 160 Tm nucleus.展开更多
The high-spin states in ^(197)Bi have been studied with the ^(187)Re(^(16)O,6n)reaction at ^(16)O energies from 85 to 105MeV.In-beam measurements of γ-ray excitation functions,γ-γ-t coincidences and γ-ray angular ...The high-spin states in ^(197)Bi have been studied with the ^(187)Re(^(16)O,6n)reaction at ^(16)O energies from 85 to 105MeV.In-beam measurements of γ-ray excitation functions,γ-γ-t coincidences and γ-ray angular distributions were carried out with six BGO(AC)HPGe detectors and one intrinsic Ge planar detector.Eleven new tram sitions and three new isomers were observed,and a level scheme for ^(197)Bi was established.Some differences between the present work and the previous results were found.展开更多
High spin states in neutron-deficient ^(117)Xe have been studied by using in-beamγspectroscopy method.A new positive-parity rotational band has been identified.It decays into the yrast vh_(11/2 )band via five electri...High spin states in neutron-deficient ^(117)Xe have been studied by using in-beamγspectroscopy method.A new positive-parity rotational band has been identified.It decays into the yrast vh_(11/2 )band via five electric dipole transitions.The magnitudes of these E1 transitions are extracted and they are much enhanced compared to the normal E1 transitions.This is taken as an evidence for octupole correlations in ^(117)Xe.展开更多
High-spin states in ^(198)Bi were populated via the ^(187)Re(^(16)O,5n)reaction.A partial level scheme for ^(198)Bi was established for the first time,including a 15^(+)high-spin isomeric state with a measured half-li...High-spin states in ^(198)Bi were populated via the ^(187)Re(^(16)O,5n)reaction.A partial level scheme for ^(198)Bi was established for the first time,including a 15^(+)high-spin isomeric state with a measured half-life of 8.0±3.6ns.By comparing the level structure of ^(198)Bi with that of the even-even core ^(198)Pb,the configuration v(i_(13/2))^(-2) v(P_(3/2))^(-1)π(h_(9/2))^(1) was ascribed to this isomeric state.展开更多
High spin states in ^(170)Ta have been studied via ^(159)Tb(^(16)O,5nγ)^(170)Ta reaction at 105MeV beam energy.Three rotational bands have been observed among which one coupled band and an unfavoredΔI=2 transition s...High spin states in ^(170)Ta have been studied via ^(159)Tb(^(16)O,5nγ)^(170)Ta reaction at 105MeV beam energy.Three rotational bands have been observed among which one coupled band and an unfavoredΔI=2 transition sequence of the semidecoupled band are identified in this work.The effects of theπ1/2^(-)[541]proton intruder orbital are qualitatively discussed.展开更多
基金Supported by the Chinese Academy of Sciences and the National Natural Science Foundation of Chins under Grant Nos.19675052,19635030 and 19805011.
文摘High-spin states of^(119)Xe have been investigated by in-beam γ-ray spectroscopy via the reaction of ^(16)O bombarding a ^(106)Cd target at beam energies of 67-80MeV. No enhanced E1 transition was observed, the non-existence of octupole correlations in ^(119) Xe.
基金Supported by the State Education Committee of Chinathe National Natural Science Foundation of China under Grant No.19605008.
文摘Two low-lying isomeric states in 169Ta have been identified via ^(159)Tb(l6O,6nγ)^(169)Ta reaction.Their half-lives are measured to be 28±5ns for the 9/2^(-)level and 17±4 ns for the 5/2^(-)level by using the delayedγ-γcoincidence method.These two isomeric states are considered to be the bandheads with 9/2-[514]and 1/2-[541]configurations,respectively.Possible neutron quasiparticle configuration for the ground state of ^(169)W is discussed.
基金Supported by the Research Fund of National Post-Doctor Committeethe China National Education Committeethe Chinese Academy of Sciences.
文摘High spin states of the odd-odd ^(162)Lu nucleus have been studied via ^(147)Sm(^(19)F,4nγ)reaction at 95MeV beam energy.Level scheme for yrast band based on π[h_(11/2)]v[i_(13/2)]quasiparticle configuration was established up to I^(π)-(23^(-))for the first time.This band shows the signature inversion in energy before backbending generally appeared in this mass region.It is stressed that the signature splitting in 162Lu is larger than that in 160 Tm nucleus.
文摘The high-spin states in ^(197)Bi have been studied with the ^(187)Re(^(16)O,6n)reaction at ^(16)O energies from 85 to 105MeV.In-beam measurements of γ-ray excitation functions,γ-γ-t coincidences and γ-ray angular distributions were carried out with six BGO(AC)HPGe detectors and one intrinsic Ge planar detector.Eleven new tram sitions and three new isomers were observed,and a level scheme for ^(197)Bi was established.Some differences between the present work and the previous results were found.
基金Supported by the National Natural Science Foundation of China。
文摘High spin states in neutron-deficient ^(117)Xe have been studied by using in-beamγspectroscopy method.A new positive-parity rotational band has been identified.It decays into the yrast vh_(11/2 )band via five electric dipole transitions.The magnitudes of these E1 transitions are extracted and they are much enhanced compared to the normal E1 transitions.This is taken as an evidence for octupole correlations in ^(117)Xe.
基金Supported by the National Natural Science Foundation of China。
文摘High-spin states in ^(198)Bi were populated via the ^(187)Re(^(16)O,5n)reaction.A partial level scheme for ^(198)Bi was established for the first time,including a 15^(+)high-spin isomeric state with a measured half-life of 8.0±3.6ns.By comparing the level structure of ^(198)Bi with that of the even-even core ^(198)Pb,the configuration v(i_(13/2))^(-2) v(P_(3/2))^(-1)π(h_(9/2))^(1) was ascribed to this isomeric state.
基金Supported by the State Education Commit tee of Chinathe National Natural Science Foundation of China under Grant No 19605008。
文摘High spin states in ^(170)Ta have been studied via ^(159)Tb(^(16)O,5nγ)^(170)Ta reaction at 105MeV beam energy.Three rotational bands have been observed among which one coupled band and an unfavoredΔI=2 transition sequence of the semidecoupled band are identified in this work.The effects of theπ1/2^(-)[541]proton intruder orbital are qualitatively discussed.
