Nuclear charge radii and electromagnetic moments of radioactive scandium isotopes and isomers
Nuclear charge radii and electromagnetic moments of radioactive scandium isotopes and isomers
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DOI：
10.1088/0954-3899/38/2/025104
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发表时间：
2011-02
期刊：
影响因子：
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通讯作者：
M. Avgoulea;Y. Gangrsky;K. Marinova;S. Zemlyanoi;S. Fritzsche;D. Iablonskyi;C. Barbieri;E. Simpson;P. Stevenson;J. Billowes;P. Campbell;B. Cheal;B. Tordoff;M. Bissell;D. H. Forest;M. Gardner;G. Tungate;J. Huikari;A. Nieminen;H. Penttilä;J. Äystö
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文献类型：
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作者：
M. Avgoulea;Y. Gangrsky;K. Marinova;S. Zemlyanoi;S. Fritzsche;D. Iablonskyi;C. Barbieri;E. Simpson;P. Stevenson;J. Billowes;P. Campbell;B. Cheal;B. Tordoff;M. Bissell;D. H. Forest;M. Gardner;G. Tungate;J. Huikari;A. Nieminen;H. Penttilä;J. Äystö
利用带有冷却聚束器的离子导向同位素分离器，在波长为363.1nm处对42- 46 Sc同位素链进行了Sc+3d 4s 3D 2 → 3d 4p 3F 3跃迁的共线激光光谱实验。核磁偶极子和电四极矩以及同位素位移确定从超精细结构的五个基态和两个异构体。进行了广泛的多构型Dirac-Fock计算，以评估特定的质量位移，MSMS和场位移，F，参数，允许评估Sc同位素序列的电荷半径趋势。所获得的电荷半径显示系统更像Ti半径，这增加对中子壳封闭N = 20，比对称的抛物线为Ca。还提取了44 Sc和45 Sc的同分异构态相对于基态的均方电荷半径的变化。45 Sc基态和同分异构态之间的电荷半径差与从B（E2）测量估计的形变效应一致，但小于从光谱四极矩提取的形变。
Collinear laser spectroscopy experiments with the Sc+ transition 3d4s 3D2 → 3d4p 3F3 at λ = 363.1 nm were performed on the 42–46Sc isotopic chain using an ion guide isotope separator with a cooler-buncher. Nuclear magnetic dipole and electric quadrupole moments as well as isotope shifts were determined from the hyperfine structure for five ground states and two isomers. Extensive multi-configurational Dirac–Fock calculations were performed in order to evaluate the specific mass-shift, MSMS, and field-shift, F, parameters which allowed evaluation of the charge radii trend of the Sc isotopic sequence. The charge radii obtained show systematics more like the Ti radii, which increase towards the neutron shell closure N = 20, than the symmetric parabolic curve for Ca. The changes in mean-square charge radii of the isomeric states relative to the ground states for 44Sc and 45Sc were also extracted. The charge radii difference between the ground and isomeric states of 45Sc is in agreement with the deformation effect estimated from the B(E2) measurements but is smaller than the deformation extracted from the spectroscopic quadrupole moments.