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2006年04月10日

【期刊论文】Shape co-existence and structural evolution of the yrast band in 157Yb

张玉虎， Y. Zheng， a， X.H. Zhou， Y.H. Zhang， Y.X. Guo， X.G. Lei， Z. Liu， J.J. He， M.L. Liu， W.J. Luo， S.X. Wen， L.H. Zhu， and C.X. Yang

Eur. Phys. J. A 14, 133-136 (2002)，-0001，（）：

-1年11月30日

摘要

The high-spin states of 157Yb have been studied via the 144Sm(16O, 3n) reaction at 16O energy of 90 MeV using techniques of in-beam γ-ray spectroscopy. Measurement of γ-γ-t coincidences was performed with 11 BGO (AC) HPGe detectors. Based on the measured results of γ-γ coincidences, γ-ray anisotropies and DCO ratios, the level scheme for 157Yb was established. The shape co-existence and structural evolution of the νi13/2 band with increasing angular momentum in 157Yb have been discussed. The systematics of the νi13/2 bands in the N=87 odd-A isotones have been compared.

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2006年04月10日

【期刊论文】Signature inversion phenomena in odd-odd 182Au

张玉虎， Y.H. Zhang， a， F.R. Xu， J.J. He， Z. Liu， X.H. Zhou， Z.G. Gan， T. Hayakawa， M. Oshima， T. Toh， T. Shizuma， J. Katakura， Y. Hatsukawa， M. Matsuda， H. Kusakari， M. Sugawara， K. Furuno， T. Komatsubara， T. Une， S.X. Wen， and Z.M. Wang

Eur. Phys. J. A 14, 271-274 (2002)，-0001，（）：

-1年11月30日

摘要

High-spin states in the odd-odd 182Au nucleus have been investigated using the 152Sm (35Cl, 5nγ)182Au reaction through X-γ and γ-γ-t coincidence measurements. Rotational bands based on the πh9/2⊗νi13/2 and πi13/2⊗νi13/2 conﬁgurations have been identiﬁed. It is found that the two bands show characteristics of low-spin signature inversion. The observed signature inversion can be well reproduced by pairing-deformation self-consistent cranking Woods-Saxon calculations.

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2006年04月10日

【期刊论文】High-spin level scheme and decay of the 67-μms isomer in 142Pm

张玉虎， M. L. Liu，， Y. H. Zhang， X. H. Zhou， Y. X. Guo， X. G. Lei， Z. Liu， J. J. He， S. X. Wen

PHYSICAL REVIEW C 70, 014304 (2004)，-0001，（）：

-1年11月30日

摘要

An in-beam γ-ray spectroscopy experiment for 142Pm has been performed via the 128Te (19F, 5n) reaction at beam energies of 75 MeV through 95 MeV. Excitation functions and γ-γ coincidences have been measured. Detailed analysis of γ-γ coincidence relationships leads to a revised high-spin level scheme for 142Pm. The πh11/2 vh11/2−1 multiplet in this nucleus has been identified and the discussion is based on a systematic of corresponding states in neighboring odd-odd nuclei. The previously known 67-μs isomer and associated decay grays have been placed into the new level scheme. This long-lived isomer is proposed to be a four-hole state with predominantly the （πg7/2−2-1d5/2-2vh11/2-1) 13-configuration.

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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】Search for Signature Inversion in the πil3/2⊗νil3/2 Band in Odd-Odd 178Ir*

张玉虎， ZHANG Yu-Hu， T. Hayakawa， M Oshima， Y. TOh， J. Katakura， Y. Hatsukawa， M Matsuda， N. Shinohara， T. Ishii， H Kusakari， M. Sugawara， T. Komatsubara， K. Furune

CHIN. PHYSLETT. Vol 18．No.10 (2001)，-0001，（）：

-1年11月30日

摘要

The soarch for the πi13/2⊗νi13/2 band in 178Ir has been conducted through the 152Sm (31P, 5nγ)178Ir reaction and thc excitation functions，x-γ and γ-γ-t coincidence mcasurements. Five rotational bands have been nowly identified The low-spin signaturc inversion in the πi13/2⊗νi13/2 band has been confirmed by the observations of linking transitions and signaturc crossing at I=25.5h. The inversion phenonJenon in πh11/2⊗νi13/2, rcho/2⊗νi13/2 and πi13/2⊗νi13/2 structulcs in 178Ir provides a unique testing ground for diffbrent theorctical interpretations.

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