Orientation and rotational parameters of asteroid 4179 Toutatis: new insights from Chang'e-2's close flyby
Orientation and rotational parameters of asteroid 4179 Toutatis: new insights from Chang'e-2's close flyby
复制标题
小行星4179 Toutatis的方向和自转参数：嫦娥二号近距离飞越的新见解
DOI：
10.1093/mnras/stv792
复制
发表时间：
2015
影响因子：
4.8
通讯作者：
Ip Wing-Huen
中科院分区：
文献类型：
--
作者：
Zhao Yuhui;Ji Jianghui;Huang Jiangchuan;Hu Shoucun;Hou Xiyun;Li Yuan;Ip Wing-Huen
在相对论框架下，利用相对论平均场模型产生的单核子波函数，研究了奇A s-d壳层核O-17、Mg-25、Al-27、Si-29和P-31的磁性形状因子。计算了单个价核子对核磁形状因子的贡献，并对每个核提取了两组核磁形状因子相对于单个价核子贡献的淬灭比。结果表明，单原子价核子贡献能很好地近似描述核磁形状因子的形状，包括最小值和最大值的位置，加入淬灭比后，实验数据能得到很好的再现.淬灭比内得到的一些其他核模型进行了比较，并讨论了每个核的物理意义。计算还表明，当μ（expt.）/ mu（s.n.）M1多极猝灭比。这意味着选择mu（expt.）/ mu（s.n.）因为奇A核的M1多极淬灭比并不总是有效的。
The magnetic form factors of the odd-A s-d shell nuclei O-17, Mg-25, Al-27, Si-29, and P-31 are studied within the relativistic frame with single-nucleon wave functions generated using the relativistic mean field model. Single valence-nucleon contributions to the nuclear magnetic form factors are calculated, and two sets of quenching ratios of the nuclear magnetic form factors relative to the single valence-nucleon contributions are extracted for each nucleus. It is found that the single valence-nucleon contributions can generally give a good approximate description for the shapes of the nuclear magnetic form factors, including the positions of the minima and maxima, and after the quenching ratios are applied the experimental data can be very well reproduced. The quenching ratios are compared with those obtained within some other nuclear models, and the physical implications for each nucleus are discussed. Calculations also show that no reasonable quenching ratios could be found for Al-27 when mu(expt.)/mu(s.n.) is chosen as the M1 multipole quenching ratio. This implies that the common way of choosing mu(expt.)/mu(s.n.) as the M1 multipole quenching ratio for the odd-A nuclei is not always valid.