Andreas Krieger, Klaus Blaum, Mark L. Bissell, Nadja Frömmgen, Christopher Geppert, Michael Hammen, Kim Kreim, Magdalena Kowalska, Jörg Krämer, Thomas Neff, Rai… 展开作者
Andreas Krieger, Klaus Blaum, Mark L. Bissell, Nadja Frömmgen, Christopher Geppert, Michael Hammen, Kim Kreim, Magdalena Kowalska, Jörg Krämer, Thomas Neff, Rainer Neugart, Gerda Neyens, Wilfried Nörtershäuser, Christian Novotny, Rodolfo Sanchez, Deyan T. Yordanov
The nuclear charge radius of $^{12}$Be was precisely determined using the technique of collinear laser spectroscopy on the $2s_{1/2}\rightarrow 2p_{1/2, 3/2}$ transition in the Be$^{+}$ ion. The mean square charge radius increases from $^{10}$Be to $^{12}$Be by $δ<r_{\rm c}^2>^{10,12} = 0.69(5) \fm^{2}$ compared to $δ<r_{\rm c}^2>^{10,11} = 0.49(5) \fm^{2}$ for the one-neutron halo isotope $^{11}$Be. Calculations in the fermionic molecular dynamics approach show a strong sensitivity of the charge radius to the structure of $^{12}$Be. The experimental charge radius is consistent with a breakdown of the N=8 shell closure.
Measuring the Variation in Nuclear Charge Radius of Xe Isotopes by EUV Spectroscopy of Highly-Charged Na-like Ions
利用高电荷态类钠离子的极紫外光谱测量了氙同位素核均方电荷半径的变化。在$^{124}$-和$^{136}$-同位素之间的Na-样D1（3s $^{2}$ S $_{1/2}$ -3 p $^2$ P $_{1/2}$）跃迁的同位素位移使用国家标准与技术研究所的电子束离子阱设备实验测定。采用相对论多体微扰理论和多组态Dirac-Hartree-Fock方法计算了质量位移和场位移系数，提高了计算精度。发现均方核电荷半径差为$δ<r^2>^{136, 124}$ = 0.269（0.042）fm $^2$。与已有的实验结果相比，本文的结果具有较小的不确定度，与Angeli和Marinova [I]的推荐值一致。Angeli和K. P. Marinova，At.数据和核数据表{ \bf 99}，69-95（2013）]。
Nuclear Charge Radius of $^9$Be from Muonic Atom Spectroscopy Using a Microcalorimeter
Technion—Israel Institute of Technology（以色列理工学院）；The Helen Diller Quantum Center, Technion—Israel Institute of Technology（海伦·迪勒量子中心，以色列理工学院）；Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-PSL Research University, Collège de France（巴黎文理研究大学卡斯特尔-布罗塞尔实验室）；Kirchhoff-Institut für Physik, Universität Heidelberg（海德堡大学基希霍夫物理研究所）；Institut für Kernphysik, Johannes Gutenberg-Universität Mainz（美因茨约翰内斯古腾堡大学核物理研究所）；PRISMA ++ Cluster of Excellence, Johannes Gutenberg-Universität Mainz（美因茨约翰内斯古腾堡大学PRISMA++卓越集群）；The Racah Institute of Physics, The Hebrew University（耶路撒冷希伯来大学拉卡物理学研究所）；KU Leuven, Instituut voor Kern- en Stralingsfysica（荷语鲁汶大学核与辐射物理研究所）
