摘要
利用能量为 80MeV的18O束流 ,通过130 Te( 18O ,5n)反应研究了143Nd的高自旋态能级结构 .基于γ γ延迟符合、γ射线的角分布及线性极化测量 ,首次发现了143Nd的一个半寿命为 ( 35± 8)ns,自旋和宇称为 4 9/ 2 + 的同质异能态 .
The high spin states of 143 Nd have been studied in 130 Te( 18 O,5n) reaction at a beam energy of 80 MeV. Based on delayed γ γ coincidence,γ ray angular distribution,and γ ray linear polarization measurements,a high spin isomer in 143 Nd was identified for the first time with a measured half life of (35±8) ns and J π =49/2 +. The characteristic of the high spin isomer in 143 Nd was stressed with a deformed independent particle model. The model assigned a stretched configuration of [ν( f 7/2 h 9/2 i 13/2 )π( h 2 11/2 )] to the 49/2 + isomer in 143 Nd As the isomers in the N =83 heavier isotones,the occurrence of the 49/2 + isomer in 143 Nd can be interpreted to be caused by the sudden change in nuclear shape along the yrast line.
出处
《高能物理与核物理》
CSCD
北大核心
2000年第5期408-413,共6页
High Energy Physics and Nuclear Physics
