中国科技论文在线

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2006年04月10日

张玉虎， Y. H. Zhang， S. Q. Zhang， Q. Z. Zhao， S. F. Zhu， H. S. Xu， X. H. Zhou， Y. X. Guo， X. G. Lei， J. Lu， W. X. Huang， Q. B. Gou， H. J. Jin， Z. Liu， Y. X. Luo， X. F. Sun， and Y. T. Zhu X. G. Wu， S. X. Wen， and C. X. Yang

PHYSICAL REVIEW C, VOLUME 60, 044311，-0001，（）：

-1年11月30日

摘要

High-spin states in 170Ta have been studied via 159Tb(16O, 5nγ)170Ta reaction through excitation functions, K x-γ, and γ-γ-t coincidence measurements. Three rotational bands have been identified which consist of two strongly coupled bands and a semidecoupled one. The quasiparticle configurations of these bands and the interpretation of experimental results are discussed based on the existing knowledge of neighboring odd-mass and odd-odd nuclei and in the framework of the cranked-shell model. Low-spin signature inversion in the π9/2-[514]⊗ν5/2+[642] and π1/2-[541]⊗ν5/2+[642] bands are discussed. A delay reduction of the band-crossing frequency is observed in the π1/2-[541]⊗ν5/2+[642] (π5/2+[402]⊗ν5/2-[642]) band. This configuration-dependent crossing frequency is discussed in comparison with the AB crossing frequencies in the related bands of neighboring odd-Z isotopes.

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2006年04月10日

【期刊论文】Low-spin signature inversion in the πh9/2⊗νi13/2 oblate band of 190Tl

张玉虎， C. Y. Xie，， X. H. Zhou， ∗， Y. H. Zhang， Y. X. Guo， X. G. Lei， Y. Zheng， M. L. Liu， L. T. Song， H. L. Wang， W. T. Guo， H. P. Yu， L. H. Zhu， X. G. Wu， and F. R. Xu

PHYSICAL REVIEW C 72, 044302 (2005)，-0001，（）：

-1年11月30日

摘要

High-spin states in 190Tl have been studied experimentally by using the 160Gd(35Cl,5n) fusion-evaporation reaction at beam energies of 167 and 175 MeV. A rotational band built on the πh9/2⊗νi13/2 configuration with oblate deformation has been established for 190Tl. Spin values are assigned by adopting the results from α-γ decay work for 194Bi found in the literature.With the configuration and spin-parity assignments, the low-spin signature inversion has been revealed for the πh9/2⊗νi13/2 oblate band in 190Tl. It is the first experimental observation of low-spin signature inversion for a band associated with the oblate πh9/2⊗νi13/2 configuration. The low-spin signature inversion for the oblate πh9/2⊗νi13/2 band can be interpreted by the two-quasiparticle-plus-rotor model including a J-dependent p-n residual interaction.

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2006年04月10日

【期刊论文】New yrast excited states of the N=84 nucleus 142Ce observed in deep inelastic reactions

张玉虎， Z. Liu， a， Y.H. Zhang， X.H. Zhou， M.L. Liu， W.J. Luo， Q.Y. Pan， Z.G. Gan， T. Hayakawa， M. Oshima， Y. Toh， T. Shizima， Y. Hatsukawa， A. Osa， T. Ishii， and M. Sugawara

Eur. Phys. J. A 13, 277-280 (2002)，-0001，（）：

-1年11月30日

摘要

Excited states of 142Ce, populated in deep inelastic reactions of 82Se projectiles bombarding 139La target, have been studied up to medium spins using in-beam γ spectroscopy techniques. Three new levels have been identiﬁed at 2625, 2995, 3834 keV, and assigned as 8+, 9(−) and 11(−), respectively. These new yrast states follow closely the level systematics of the even mass N=84 isotones. Their strctures have been discussed with the help of empirical shell model calculations.

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2006年04月10日

【期刊论文】Properties of the πi13/2⊗vi13/2 band in odd-odd 184Au

张玉虎， Y. H. Zhang，， Y. D. Fang， G. de Angelis， N. Marginean， A. Gadea， D. R. Napoli， M. Axiotis， C. Rusu， T. Martinez， H. L. Wang， X. H. Zhou， W. T. Guo， M. L. Liu， Y. X. Guo， X. G. Lei， M. Oshima， and Y. Toh

PHYSICAL REVIEW C 70, 057303 (2004)，-0001，（）：

-1年11月30日

摘要

High-spin level structure in 184Au has been reinvestigated using the multidetector array of GASP via the 159Tbs29Si,4n gd184Au reaction at a beam energy of 140 MeV. The ground-state band and the excited πi13/2⊗vi13/2 2-qp band have been extended up to lower and higher spin states. An upbend has been observed in the excited band at hω～0.25 MeV and is interpreted as resulting from a pair of πh9/2 alignment. This lowfrequency (πh9/2)2 alignment is supported by the measured B(M1)/B(E2) ratios and alignment properties in neighboring odd-A nuclei. The linking transitions between the two bands and to the ground state have been established leading to a firm spin-and-parity assignment for the πi13/2⊗vi13/2 band in 184Au. This result provides strong evidence for the low-spin signature inversion in the πi13/2⊗vi13/2 bands of odd-odd nuclei in the A,180 mass region.

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2006年04月10日

【期刊论文】High-spin level scheme of 183Au

张玉虎， L. T. Song，， X. H. Zhou， Y. H. Zhang， G. de Angelis， N. Marginean， A. Gadea， D. R. Napoli， M. Axiotis， C. Rusu， T. Martinez， Y. X. Guo， X. G. Lei， Y. Zheng， and M. L. Liu

PHYSICAL REVIEW C 71, 017302 (2005)，-0001，（）：

-1年11月30日

摘要

High-spin states in 183Au have been studied experimentally using the 159Tb(29Si, 5n)183Au reaction at a beam energy of 140 MeV. Three- or higherfold γ-ray coincidences have been measured using the detector array of GASP. The level scheme of 183Auwas revised and extended.Arotational band proposed as the unfavored signature branch of the πi13/2 band has been observed for 183Au. Interaction properties between the two negative-signature bands of the πh9/2-π7/2 system have been discussed for the light odd-A Au nuclei.

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