High spin states in the odd-odd nucleus 124Cs have been investigated through the fusion-evaporation reaction 116Sn（11B, 3n）l24 Cs with a beam energy of 45 MeV. A new rotational band is established and assigned as th...High spin states in the odd-odd nucleus 124Cs have been investigated through the fusion-evaporation reaction 116Sn（11B, 3n）l24 Cs with a beam energy of 45 MeV. A new rotational band is established and assigned as the high-k configuration of πg9/2140419/2＋ ⊙vh 11/2[523]7/2-. Some structures linking to this band have also been observed. According to the results of the excitation energy systematics, the lowest level of this band is assigned as 9-, and the 8- isomer bandhead has not been observed. Another isomer with a half life of 6.3 s has also been observed with its new decay paths established, Its excitation energy is raised by 79 keV, but its Iπ is not changed.展开更多
A new band in the odd proton nucleus ^123I is identified via in-beam γ-ray spectroscopy using the ^14N＋^116Cd reaction. This band shows up as doublets with the previously assigned π97/2 （vh11/2）^2 band. Possible...A new band in the odd proton nucleus ^123I is identified via in-beam γ-ray spectroscopy using the ^14N＋^116Cd reaction. This band shows up as doublets with the previously assigned π97/2 （vh11/2）^2 band. Possible configurations of the new band are discussed in the framework of the cranked shell model and the geometrical model It is argued that the new band might be a chiral partner of the previously known πg9/2 （vh11/2）2 band.展开更多
High spin states in the odd-A nucleus 113^In have been investigated using the re- action 110^Pd（7^Li, 4n） at a beam energy of 50 MeV. A new positive parity dipole band with the configuration of π（g9/2）^-lv（h11/2...High spin states in the odd-A nucleus 113^In have been investigated using the re- action 110^Pd（7^Li, 4n） at a beam energy of 50 MeV. A new positive parity dipole band with the configuration of π（g9/2）^-lv（h11/2）^2 v （g7/2）^2 is established. The effective interaction V（θ） values of this band have been successfully described by a semiclassical geometric model based on shear mechanism, which show that the dipole band has the characteristics of magnetic rotation. In addition the collective rotational angular momentum for this band is extracted. The results show that the core contribution increases gradually with the increase of the rotation frequency.展开更多
Level structures of 113 In are studied through the fusion-evaporation reaction 110 Pd(7 Li,4n)113In at a beam energy of 50 Me V.Two new bands are established for the first time.Here the ΔI =2 band based on proton exc...Level structures of 113 In are studied through the fusion-evaporation reaction 110 Pd(7 Li,4n)113In at a beam energy of 50 Me V.Two new bands are established for the first time.Here the ΔI =2 band based on proton excitation is assigned to the πg-29/2 (0)υh211/2d5/2 configuration.In addition,the backbending associated with the additional aligned h11/2 neutron pair is found in the negative parity yrast band.The experimental results are compared with self-consistent tilted axis cranking relativistic mean field calculations.Several decay paths of theπ h11/2intruder band are established,by which the level energies and spins of the πh11/2 intruder band are determined.The bandcrossing delay of the πh11/2 intruder bands around the Z =50 shell and the dynamic moment of inertia of the πg-19/2 (0) υh^(2)_(11/2) bands in 113,115,117,119 In are studied systematically.展开更多
The so-called hyperbolic dependence of apparent moment of inertia on square of rotational frequency is developed to the bands involving^13/2 quasineutron around A-60 lighter rare-earth region.This can be explained as ...The so-called hyperbolic dependence of apparent moment of inertia on square of rotational frequency is developed to the bands involving^13/2 quasineutron around A-60 lighter rare-earth region.This can be explained as a characteristic of strongly Coriolis mixing in the high-j unique-parity bands.As applications of such an effectj the previously proposed assignments of band x of^(160)Ho,π1/2^(-)[541]■vi_(13/2)band of^(170)Ta,as well as band B of 168Lu have been reviewed respectively.展开更多
The level states of the nucleus ^(124)Cs have been populated through the ^(116)Sn(^(11) B,3n)reaction at a beam energy of 45MeV,provided by the HI-13 tandem accelerator of the China Institute of Atomic Energy.A number...The level states of the nucleus ^(124)Cs have been populated through the ^(116)Sn(^(11) B,3n)reaction at a beam energy of 45MeV,provided by the HI-13 tandem accelerator of the China Institute of Atomic Energy.A number of low-lying states are constructed.The level states in theπh_(11/2)νg_(7/2) side band are extended down to lower spin by one h.The level energies and spins in the rotational bands are determined through the establishment of various connections,which confirm the spin assignment of the yrast band in ^(124)Cs based on excitation energy systematics.It is revealed that with the present spin assignment,theπh_(11/2)νg_(7/2) side band shows signature inversion at low-spin region and the inversion occurs at a spin of about 16h.展开更多
The high-spin states of the odd-odd nucleus 170Ta have been studied by the 150Gd(19F,4n)170Ta reaction at the beam energy of 97 MeV.The α=1 sequence of the semi-decoupled band has been pushed to higher-spin states an...The high-spin states of the odd-odd nucleus 170Ta have been studied by the 150Gd(19F,4n)170Ta reaction at the beam energy of 97 MeV.The α=1 sequence of the semi-decoupled band has been pushed to higher-spin states and the signature inversion point was observed at 19.5ħ.The results are compared with those of the neighboring odd-odd nuclei.展开更多
High-spin states of ^160Tm are studied by the ^146 Nd（^19F, 5n） reaction at a beam energy of 102 MeV. The previously known πh11/2 ＋ vi13/2 yrast band and πh11/2 ＋ vh9/2 side band are confirmed. The level scheme ...High-spin states of ^160Tm are studied by the ^146 Nd（^19F, 5n） reaction at a beam energy of 102 MeV. The previously known πh11/2 ＋ vi13/2 yrast band and πh11/2 ＋ vh9/2 side band are confirmed. The level scheme is enriched and more low-lying levels are observed. A new side band is observed and assigned as the favoured signature partner of πd3/2 ＋ vi13/2. The spin of this band is assigned with the energy level systematics. It is pointed out that the B （M1）/B （E2） ratios increase rapidly at the high frequency approaching the second crossing in the π h11/2 ＋ vi13/2 braid, which is closely related to the alignment gain of the aligned i13/2 quasineutron.展开更多
Low-lying and high-spin states of ^124 Cs are studied through the ^116 Sn（^11 B,3n）^124 Cs reaction at a beam energy of 45 MeV. Several new linking transitions are observed, including three transitions between the y...Low-lying and high-spin states of ^124 Cs are studied through the ^116 Sn（^11 B,3n）^124 Cs reaction at a beam energy of 45 MeV. Several new linking transitions are observed, including three transitions between the yrast and πh11/2 vd3/2 bands and two transitions between the yrast and πh11/2 v（d5/2, g7/2） bands. These transitions fix the excitation energy of the yrast band and its decay path, and confirm the existence of eight E1 finking transitions between the yrast and πh11/2 v（d5/2, 97/2） bands observed before. These E1 linking transitions infer the oetupole correlation in ^124Cs. The decay paths of the yrast band are investigated, and discrepancies in the level scheme of ^124Cs in the latest two studies are clarified. The reason for the discrepancies is discussed. A new decoupled band is established and temporarily assigned as the unfavored signature partner of πh11/2 vd3/2 configuration.展开更多
基金supported by National Natural Science Foundation of China(Nos.10105003,11075064,11075214 and 10927507)the Specialized Research Fund for the Doctoral Programme of Higher Education of China(No.20050183008)the National Basic Research Programme of China(No.2007CB815005)
文摘High spin states in the odd-odd nucleus 124Cs have been investigated through the fusion-evaporation reaction 116Sn（11B, 3n）l24 Cs with a beam energy of 45 MeV. A new rotational band is established and assigned as the high-k configuration of πg9/2140419/2＋ ⊙vh 11/2[523]7/2-. Some structures linking to this band have also been observed. According to the results of the excitation energy systematics, the lowest level of this band is assigned as 9-, and the 8- isomer bandhead has not been observed. Another isomer with a half life of 6.3 s has also been observed with its new decay paths established, Its excitation energy is raised by 79 keV, but its Iπ is not changed.
基金Supported by the National Natural Science Foundation of China under Grant 10675053, the National Basic Research Program of China under Grant No 2007CB815005） and the Specialized Research Fund for the Doctoral Programme of Higher Education of China under Grant No 20060183048.
文摘A new band in the odd proton nucleus ^123I is identified via in-beam γ-ray spectroscopy using the ^14N＋^116Cd reaction. This band shows up as doublets with the previously assigned π97/2 （vh11/2）^2 band. Possible configurations of the new band are discussed in the framework of the cranked shell model and the geometrical model It is argued that the new band might be a chiral partner of the previously known πg9/2 （vh11/2）2 band.
基金supported by National Natural Science Foundation of China (Nos.10105003,11075064,11075214,10927507)the Specialized Research Fund for the Doctoral Programme of Higher Education of China (No.20050183008)National Basic Research Programme of China (No.2007CB815005)
文摘High spin states in the odd-A nucleus 113^In have been investigated using the re- action 110^Pd（7^Li, 4n） at a beam energy of 50 MeV. A new positive parity dipole band with the configuration of π（g9/2）^-lv（h11/2）^2 v （g7/2）^2 is established. The effective interaction V（θ） values of this band have been successfully described by a semiclassical geometric model based on shear mechanism, which show that the dipole band has the characteristics of magnetic rotation. In addition the collective rotational angular momentum for this band is extracted. The results show that the core contribution increases gradually with the increase of the rotation frequency.
基金Supported by the National Basic Research Program of China under Grant No 2007CB815005the National Natural Science Foundation of China under Grant No 11075064the Specialized Research Fund for the Doctoral Programme of Higher Education of China under Grant No 20050183008.
文摘Level structures of 113 In are studied through the fusion-evaporation reaction 110 Pd(7 Li,4n)113In at a beam energy of 50 Me V.Two new bands are established for the first time.Here the ΔI =2 band based on proton excitation is assigned to the πg-29/2 (0)υh211/2d5/2 configuration.In addition,the backbending associated with the additional aligned h11/2 neutron pair is found in the negative parity yrast band.The experimental results are compared with self-consistent tilted axis cranking relativistic mean field calculations.Several decay paths of theπ h11/2intruder band are established,by which the level energies and spins of the πh11/2 intruder band are determined.The bandcrossing delay of the πh11/2 intruder bands around the Z =50 shell and the dynamic moment of inertia of the πg-19/2 (0) υh^(2)_(11/2) bands in 113,115,117,119 In are studied systematically.
基金Supported by the National Natural Science Foundation of China under Grant No.19675017.
文摘The so-called hyperbolic dependence of apparent moment of inertia on square of rotational frequency is developed to the bands involving^13/2 quasineutron around A-60 lighter rare-earth region.This can be explained as a characteristic of strongly Coriolis mixing in the high-j unique-parity bands.As applications of such an effectj the previously proposed assignments of band x of^(160)Ho,π1/2^(-)[541]■vi_(13/2)band of^(170)Ta,as well as band B of 168Lu have been reviewed respectively.
基金Supported by the National Natural Science Foundation of China under Grant No.19775019.
文摘The level states of the nucleus ^(124)Cs have been populated through the ^(116)Sn(^(11) B,3n)reaction at a beam energy of 45MeV,provided by the HI-13 tandem accelerator of the China Institute of Atomic Energy.A number of low-lying states are constructed.The level states in theπh_(11/2)νg_(7/2) side band are extended down to lower spin by one h.The level energies and spins in the rotational bands are determined through the establishment of various connections,which confirm the spin assignment of the yrast band in ^(124)Cs based on excitation energy systematics.It is revealed that with the present spin assignment,theπh_(11/2)νg_(7/2) side band shows signature inversion at low-spin region and the inversion occurs at a spin of about 16h.
基金Supported by the National Natural Science Foundation of China under Grant Nos.19635030 and 19675007.
文摘The high-spin states of the odd-odd nucleus 170Ta have been studied by the 150Gd(19F,4n)170Ta reaction at the beam energy of 97 MeV.The α=1 sequence of the semi-decoupled band has been pushed to higher-spin states and the signature inversion point was observed at 19.5ħ.The results are compared with those of the neighboring odd-odd nuclei.
基金Supported by the National Natural Science Foundation of China under Grant No 10105003, the Specialized Research Fund for the Doctoral Programme of Higher Education of China under Grant No 20050183008, and the National Basic Research Programme of China under Grant No 2007CB815000.
文摘High-spin states of ^160Tm are studied by the ^146 Nd（^19F, 5n） reaction at a beam energy of 102 MeV. The previously known πh11/2 ＋ vi13/2 yrast band and πh11/2 ＋ vh9/2 side band are confirmed. The level scheme is enriched and more low-lying levels are observed. A new side band is observed and assigned as the favoured signature partner of πd3/2 ＋ vi13/2. The spin of this band is assigned with the energy level systematics. It is pointed out that the B （M1）/B （E2） ratios increase rapidly at the high frequency approaching the second crossing in the π h11/2 ＋ vi13/2 braid, which is closely related to the alignment gain of the aligned i13/2 quasineutron.
基金Supported by the National Natural Science Foundation of China under Grant No 10105003, the Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant No 20050183008, and the National Basic Research Program of China under Grant No 2007CB815000.
文摘Low-lying and high-spin states of ^124 Cs are studied through the ^116 Sn（^11 B,3n）^124 Cs reaction at a beam energy of 45 MeV. Several new linking transitions are observed, including three transitions between the yrast and πh11/2 vd3/2 bands and two transitions between the yrast and πh11/2 v（d5/2, g7/2） bands. These transitions fix the excitation energy of the yrast band and its decay path, and confirm the existence of eight E1 finking transitions between the yrast and πh11/2 v（d5/2, 97/2） bands observed before. These E1 linking transitions infer the oetupole correlation in ^124Cs. The decay paths of the yrast band are investigated, and discrepancies in the level scheme of ^124Cs in the latest two studies are clarified. The reason for the discrepancies is discussed. A new decoupled band is established and temporarily assigned as the unfavored signature partner of πh11/2 vd3/2 configuration.
