The search for the ri_(13/2) vi_(13/2 ) band in ^(178)Ir has been conducted through the ^(152)Sm(^(31) P, 5nγ)^( 178)Ir reaction and the excitation functions, x-γ and γ-γ-t coincidence measurements. Five rotationa...The search for the ri_(13/2) vi_(13/2 ) band in ^(178)Ir has been conducted through the ^(152)Sm(^(31) P, 5nγ)^( 178)Ir reaction and the excitation functions, x-γ and γ-γ-t coincidence measurements. Five rotational bands have been newly identified. The low-spin signature inversion in the πi13/2 vi13/2 band has been confirmed by the observations of linking transitions and signature crossing at I = 25.5 h. The inversion phenomenon in rh11/2 vi_(13/2), rh9/2 vi_(13/2) and ri_(13/2) vi13/2 structures in ^(178)Ir provides a unique testing ground for different theoretical interpretations.展开更多
High-spin states of odd-odd^(182)Au has been studied for the first time,by USing^(152)Sm(^(35)Cl,5n)^(182)Au reaction at 183MeV beam energy.The^(35)Cl beam was provided by the JAERI(Japan Atomic Energy Research Instit...High-spin states of odd-odd^(182)Au has been studied for the first time,by USing^(152)Sm(^(35)Cl,5n)^(182)Au reaction at 183MeV beam energy.The^(35)Cl beam was provided by the JAERI(Japan Atomic Energy Research Institute)tandem accelerator.The target is an enriched^(152)Sm metallic fon of 1 mg/cm^2 thickhess with 5 mg/cm^2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
Excited states of ^134Ba, populated via the heavy-ion induced ^128Te(^10B, 1p3n)134Ba reaction at 46 MeV beam energy, have been studied to medium and high spins by in-beam γ-ray spectroscopy techniques. The experimen...Excited states of ^134Ba, populated via the heavy-ion induced ^128Te(^10B, 1p3n)134Ba reaction at 46 MeV beam energy, have been studied to medium and high spins by in-beam γ-ray spectroscopy techniques. The experiment was performed at the tandem accelerator laboratory in the University of Tsukuba, Japan. The target is an isotopically enriched ^128Te metallic foil of 2.3mg/cm^2 thickness with a 3mg/cm^2 gold backing. Nine anti-Compton HPGe detectors were employed for the measurements of γ-γ-t coincidences. The level scheme of ^134Ba, deduced from this study, was shown in Fig.1.展开更多
Study of in-beam γ-ray spectroscopy of ^145Tb has been carried out by using ^118Sn (32 S, 1p4n) ^145Tb reaction. Excitation functions, X-γ-t and γ-γ-t coincidences and γ-ray anisotropies were measured. Here, t re...Study of in-beam γ-ray spectroscopy of ^145Tb has been carried out by using ^118Sn (32 S, 1p4n) ^145Tb reaction. Excitation functions, X-γ-t and γ-γ-t coincidences and γ-ray anisotropies were measured. Here, t refers to the relative time difference between any two coincident γ-rays detected within ±200 ns. A level scheme of ^14tTb, including 81 γ-transitions as shown in Fig.l, has been established up to 7.4 MeV in excitation energy and spinparity assignments for most of the observed levels have been done. The level structure shows characteristics of spherical nucleus. The observed states with excitation energies less than 2 MeV are interpreted by coupling an h11/2 proton to the 2^+, 4^+ and 3^- core excitations in ^144Gd. The excitation energies of these states fit wellin to the systematics of the neighboring odd-A N=80 isotones, and are well reproduced by the quasiparticle-cluster interaction calculations[1]. Semi-empirical shell model calculations[2] have been done for the higher-lying levels. The results clearly reveal the characteristic features of multiparticle configurations in a spherical nucleus. Specific configurations are proposed for the yrast and some non-yrast levels.展开更多
High spin states of ^135La have been experimentally studied by ^128Te(^10B, 3n)^135La reaction. The ^10B beam was provided by the tandem accelerator laboratory in the University of Tsukuba, Japan. Based on the γ-γ c...High spin states of ^135La have been experimentally studied by ^128Te(^10B, 3n)^135La reaction. The ^10B beam was provided by the tandem accelerator laboratory in the University of Tsukuba, Japan. Based on the γ-γ coincidence relationships, relative intensities and ADO ratios, a level scheme of ^135La has been established.展开更多
Study of in-bearnγ-ray spectroscopy o^(127)I has been carried out by using^(124)Sn(~7Li,4n)^(127)I reaction.The~7Li beam was delivered by the Tandem Accelerator in the University of Tsukuba,Japan.The target was an en...Study of in-bearnγ-ray spectroscopy o^(127)I has been carried out by using^(124)Sn(~7Li,4n)^(127)I reaction.The~7Li beam was delivered by the Tandem Accelerator in the University of Tsukuba,Japan.The target was an enriched self-supporting^(124)Sn metallic foil of 4 mg/cm^(2)thickness.Aγ-ray detector array composed of one planar detector and 9 BGO-Compton-suppressed Ge detectors was used.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
High-spin states of odd-odd^(178)Ir has been studied by using^(152)Sm(^(31)P,5n)^(178)Ir reaction.The^(31)P bcam was provided by the JAERI(Japan Atomic Enetgy Research Institute)tandem acceelerator.The target is an en...High-spin states of odd-odd^(178)Ir has been studied by using^(152)Sm(^(31)P,5n)^(178)Ir reaction.The^(31)P bcam was provided by the JAERI(Japan Atomic Enetgy Research Institute)tandem acceelerator.The target is an enriched^(152)Sm metallic foil of 1 mg/cm^2 thickness with 5 mg/cm^2 Au backing.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos.10025525 and 19605008the Japan STA Scientist Exchange Programme,the JSPS Invitation Fellowship Programme for Research in Japan under Grant No.L00515the Major State Basic Research Development Programme of China(Contract No.G2000077400).
文摘The search for the ri_(13/2) vi_(13/2 ) band in ^(178)Ir has been conducted through the ^(152)Sm(^(31) P, 5nγ)^( 178)Ir reaction and the excitation functions, x-γ and γ-γ-t coincidence measurements. Five rotational bands have been newly identified. The low-spin signature inversion in the πi13/2 vi13/2 band has been confirmed by the observations of linking transitions and signature crossing at I = 25.5 h. The inversion phenomenon in rh11/2 vi_(13/2), rh9/2 vi_(13/2) and ri_(13/2) vi13/2 structures in ^(178)Ir provides a unique testing ground for different theoretical interpretations.
基金Supported by NNSF of China,STA Scientist Exchange Program and Major State Basic Research Development Program of China.
文摘High-spin states of odd-odd^(182)Au has been studied for the first time,by USing^(152)Sm(^(35)Cl,5n)^(182)Au reaction at 183MeV beam energy.The^(35)Cl beam was provided by the JAERI(Japan Atomic Energy Research Institute)tandem accelerator.The target is an enriched^(152)Sm metallic fon of 1 mg/cm^2 thickhess with 5 mg/cm^2
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Excited states of ^134Ba, populated via the heavy-ion induced ^128Te(^10B, 1p3n)134Ba reaction at 46 MeV beam energy, have been studied to medium and high spins by in-beam γ-ray spectroscopy techniques. The experiment was performed at the tandem accelerator laboratory in the University of Tsukuba, Japan. The target is an isotopically enriched ^128Te metallic foil of 2.3mg/cm^2 thickness with a 3mg/cm^2 gold backing. Nine anti-Compton HPGe detectors were employed for the measurements of γ-γ-t coincidences. The level scheme of ^134Ba, deduced from this study, was shown in Fig.1.
文摘Study of in-beam γ-ray spectroscopy of ^145Tb has been carried out by using ^118Sn (32 S, 1p4n) ^145Tb reaction. Excitation functions, X-γ-t and γ-γ-t coincidences and γ-ray anisotropies were measured. Here, t refers to the relative time difference between any two coincident γ-rays detected within ±200 ns. A level scheme of ^14tTb, including 81 γ-transitions as shown in Fig.l, has been established up to 7.4 MeV in excitation energy and spinparity assignments for most of the observed levels have been done. The level structure shows characteristics of spherical nucleus. The observed states with excitation energies less than 2 MeV are interpreted by coupling an h11/2 proton to the 2^+, 4^+ and 3^- core excitations in ^144Gd. The excitation energies of these states fit wellin to the systematics of the neighboring odd-A N=80 isotones, and are well reproduced by the quasiparticle-cluster interaction calculations[1]. Semi-empirical shell model calculations[2] have been done for the higher-lying levels. The results clearly reveal the characteristic features of multiparticle configurations in a spherical nucleus. Specific configurations are proposed for the yrast and some non-yrast levels.
文摘High spin states of ^135La have been experimentally studied by ^128Te(^10B, 3n)^135La reaction. The ^10B beam was provided by the tandem accelerator laboratory in the University of Tsukuba, Japan. Based on the γ-γ coincidence relationships, relative intensities and ADO ratios, a level scheme of ^135La has been established.
基金Supported by NNSF of China,JSPS Invitation Fellowship(LOO515)Major State Basic Research Development Programthe Chinese Academy of Sciences.
文摘Study of in-bearnγ-ray spectroscopy o^(127)I has been carried out by using^(124)Sn(~7Li,4n)^(127)I reaction.The~7Li beam was delivered by the Tandem Accelerator in the University of Tsukuba,Japan.The target was an enriched self-supporting^(124)Sn metallic foil of 4 mg/cm^(2)thickness.Aγ-ray detector array composed of one planar detector and 9 BGO-Compton-suppressed Ge detectors was used.
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 NNSF of ChinaSTA Scientist Exchange ProgramMajor State Basic Research Development Program of China.
文摘High-spin states of odd-odd^(178)Ir has been studied by using^(152)Sm(^(31)P,5n)^(178)Ir reaction.The^(31)P bcam was provided by the JAERI(Japan Atomic Enetgy Research Institute)tandem acceelerator.The target is an enriched^(152)Sm metallic foil of 1 mg/cm^2 thickness with 5 mg/cm^2 Au backing.
