The high-spin level structure of 186 Au is re-investigated by means of in-beam γ-ray spectroscopy via the 172 Yb(19 F,5nγ )186 Au reaction.The oblate bands previously reported are revised and extended to higher-spin...The high-spin level structure of 186 Au is re-investigated by means of in-beam γ-ray spectroscopy via the 172 Yb(19 F,5nγ )186 Au reaction.The oblate bands previously reported are revised and extended to higher-spin states.A new Iπ =(20+) excited state has been identified and assigned to the πh-111/2 (×) vi-213/2h-19/2 configuration.The total Routhian surface and cranked shell model calculations suggest that the πh-111/2 (×) vi-213/2h-19/2 band in 186Au has a non-axial deformation.展开更多
Low-spin signature inversion in theπh9/2■vi_(13/2)band was reported for the first time by Bark et al.~[1]in^(162,164)Tm and^(174)Ta in 1997.Since then,this inversion phenomenon has been found in several neighboring ...Low-spin signature inversion in theπh9/2■vi_(13/2)band was reported for the first time by Bark et al.~[1]in^(162,164)Tm and^(174)Ta in 1997.Since then,this inversion phenomenon has been found in several neighboring odd-odd nuclei.During the past few years,we have made great efforts to investigate the band structures in odd-odd nuclei in this mass rgion,leading to observation of signature invesion in^(170)Ta,^(172)Re,^(176~280)Ir and ^(182)Au,respectively.展开更多
High-spin states of odd-odd 172Re has been studied, for the first time, by using 149Sm(27Al, 4n) 172Re reaction. The 27A1 beam was provided by the JAERI (Japan Atomic Energy Research Institute) tandem accelerator. The...High-spin states of odd-odd 172Re has been studied, for the first time, by using 149Sm(27Al, 4n) 172Re reaction. The 27A1 beam was provided by the JAERI (Japan Atomic Energy Research Institute) tandem accelerator. The target was an enriched 149Sm metallic powder of 2.1 mg/cm2 thickness evaporated on to a 5.5 mg/cm2 Pb backing layer. A γ-ray detector array was used comprising 12 HPGe's with BGO展开更多
High-spin states in 169Re have been investigated by means of in-beam 7-ray spectroscopy techniques with the 144Sm(28Si, 1p2n) 169Re reaction. X-γ and γ-γ-t coincidences, 7-ray anisotropies, and DCO ratios were meas...High-spin states in 169Re have been investigated by means of in-beam 7-ray spectroscopy techniques with the 144Sm(28Si, 1p2n) 169Re reaction. X-γ and γ-γ-t coincidences, 7-ray anisotropies, and DCO ratios were measured. A strongly coupled band based on the 9/2-[514] Nilsson state and a decoupled band built on the h9/2 intruder proton orbital (nominally 1/2- [541]) have been established. The AB neutron crossings are observed at hω=0.23 and 0.27 MeV for the 9/2-[514] and 1/2-[541] bands, respectively. The difference between展开更多
High-spin states in ^179Au have been studied experimentally by using the ^149Sm(^35C1, 5n) reaction at beam energies of 164,~180 MeV. The ^35C1 beam was provided by the tandem accelerator at the Japan Atomic En-ergy R...High-spin states in ^179Au have been studied experimentally by using the ^149Sm(^35C1, 5n) reaction at beam energies of 164,~180 MeV. The ^35C1 beam was provided by the tandem accelerator at the Japan Atomic En-ergy Research Institute (JAERI). The target is an isotopically enriched ^149Sm metallic foil of 1.5 mg/cm^2 thickness with a 5.0 mg/cm^2 Pb backing. Measurements of γ-ray excitation functions, X-γ coincidences and γ-γ-t coincidences were performed with 13 HPGe's with BGO anti-Compton shields and three LOAX detectors.展开更多
High-spin states of odd-odd^(176)Ir has been studied for the first time,by using^(149)Sm(^(31)P,4n)^(176)Ir reaction.The^(31)P beam was provided by the JAERI(Japan Atomic Energy Research Institute)tandem accelerator.T...High-spin states of odd-odd^(176)Ir has been studied for the first time,by using^(149)Sm(^(31)P,4n)^(176)Ir reaction.The^(31)P beam was provided by the JAERI(Japan Atomic Energy Research Institute)tandem accelerator.The target was an enriched^(149)Sm metallic powder of 2.1 mg/cm^(2) thickness evaporated on to a 5.5mg/cm^(2) Pb backing layer.展开更多
Low-spin signature inversion is a very interesting phenomenon observed in a number of deformed odd-odd nuclei and it has been attracting large experimental and theoretical interests.Up to date,the signature inversion ...Low-spin signature inversion is a very interesting phenomenon observed in a number of deformed odd-odd nuclei and it has been attracting large experimental and theoretical interests.Up to date,the signature inversion has been systematically observed throughout the chart of nuclides in theπg_(9/2)■vg_(9/2),πh_(11/2),πh_(11/2)■vi_(13/2),andπh_(9/2)■vi_(13/2)configurations.展开更多
The level structure of ^19Opt has been studied experimentally using the ^176yb （^18O, 4n） reaction at beam energies of 88 and 95 MeV. γ-γ-t coincidence measurements were carried out. Based on the analysis of T-T ...The level structure of ^19Opt has been studied experimentally using the ^176yb （^18O, 4n） reaction at beam energies of 88 and 95 MeV. γ-γ-t coincidence measurements were carried out. Based on the analysis of T-T coincidence relationships, the level scheme of ^190Pt is extended to high-spin states. A new structure built on the 3413.6 keV 14＋ state has been observed, and the ＂vi13/2^-2 vh9/2^-1 vj （j = P3/2 or f5/2） configuration is tentatively assigned to it.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 10905075,10825522,10735010,and 10975006the National Basic Research Program of China under Grant No 2007CB815005the Chinese Academy of Sciences.
文摘The high-spin level structure of 186 Au is re-investigated by means of in-beam γ-ray spectroscopy via the 172 Yb(19 F,5nγ )186 Au reaction.The oblate bands previously reported are revised and extended to higher-spin states.A new Iπ =(20+) excited state has been identified and assigned to the πh-111/2 (×) vi-213/2h-19/2 configuration.The total Routhian surface and cranked shell model calculations suggest that the πh-111/2 (×) vi-213/2h-19/2 band in 186Au has a non-axial deformation.
基金Supported by NNSF of China,STA Scientist Exchange Program and Major State Basic Research Development Program of China.
文摘Low-spin signature inversion in theπh9/2■vi_(13/2)band was reported for the first time by Bark et al.~[1]in^(162,164)Tm and^(174)Ta in 1997.Since then,this inversion phenomenon has been found in several neighboring odd-odd nuclei.During the past few years,we have made great efforts to investigate the band structures in odd-odd nuclei in this mass rgion,leading to observation of signature invesion in^(170)Ta,^(172)Re,^(176~280)Ir and ^(182)Au,respectively.
基金Supported by NNSF of China, the Major State Basic Research Development Program of China and the Chinese Academy of Sciences.
文摘High-spin states of odd-odd 172Re has been studied, for the first time, by using 149Sm(27Al, 4n) 172Re reaction. The 27A1 beam was provided by the JAERI (Japan Atomic Energy Research Institute) tandem accelerator. The target was an enriched 149Sm metallic powder of 2.1 mg/cm2 thickness evaporated on to a 5.5 mg/cm2 Pb backing layer. A γ-ray detector array was used comprising 12 HPGe's with BGO
文摘High-spin states in 169Re have been investigated by means of in-beam 7-ray spectroscopy techniques with the 144Sm(28Si, 1p2n) 169Re reaction. X-γ and γ-γ-t coincidences, 7-ray anisotropies, and DCO ratios were measured. A strongly coupled band based on the 9/2-[514] Nilsson state and a decoupled band built on the h9/2 intruder proton orbital (nominally 1/2- [541]) have been established. The AB neutron crossings are observed at hω=0.23 and 0.27 MeV for the 9/2-[514] and 1/2-[541] bands, respectively. The difference between
文摘High-spin states in ^179Au have been studied experimentally by using the ^149Sm(^35C1, 5n) reaction at beam energies of 164,~180 MeV. The ^35C1 beam was provided by the tandem accelerator at the Japan Atomic En-ergy Research Institute (JAERI). The target is an isotopically enriched ^149Sm metallic foil of 1.5 mg/cm^2 thickness with a 5.0 mg/cm^2 Pb backing. Measurements of γ-ray excitation functions, X-γ coincidences and γ-γ-t coincidences were performed with 13 HPGe's with BGO anti-Compton shields and three LOAX detectors.
基金Supported by NNSF of China,the Major State Basic Research Development Program of China,and the Chinese Academy of Sciences.
文摘High-spin states of odd-odd^(176)Ir has been studied for the first time,by using^(149)Sm(^(31)P,4n)^(176)Ir reaction.The^(31)P beam was provided by the JAERI(Japan Atomic Energy Research Institute)tandem accelerator.The target was an enriched^(149)Sm metallic powder of 2.1 mg/cm^(2) thickness evaporated on to a 5.5mg/cm^(2) Pb backing layer.
基金Supported by NNSF of China,STA Scientist Exchange ProgramMajor State Basic Research Development Program of China.
文摘Low-spin signature inversion is a very interesting phenomenon observed in a number of deformed odd-odd nuclei and it has been attracting large experimental and theoretical interests.Up to date,the signature inversion has been systematically observed throughout the chart of nuclides in theπg_(9/2)■vg_(9/2),πh_(11/2),πh_(11/2)■vi_(13/2),andπh_(9/2)■vi_(13/2)configurations.
基金Supported by National Natural Science Foundation of China(10505025,10475097)Chinese Academy of Sciences
文摘The level structure of ^19Opt has been studied experimentally using the ^176yb （^18O, 4n） reaction at beam energies of 88 and 95 MeV. γ-γ-t coincidence measurements were carried out. Based on the analysis of T-T coincidence relationships, the level scheme of ^190Pt is extended to high-spin states. A new structure built on the 3413.6 keV 14＋ state has been observed, and the ＂vi13/2^-2 vh9/2^-1 vj （j = P3/2 or f5/2） configuration is tentatively assigned to it.
