Nuclear charge radius of <sup>11sup>Li
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- 作者：Rodolfo S谩nchez ; Wilfried N枚rtersh盲user ; Andreas Dax ; Guido Ewald ; Stefan G枚tte ; Reinhard Kirchner ; H.-J眉rgen Kluge ; Thomas K眉hl ; Agnieszka Wojtaszek and Bruce A. Bushaw ; et al.
- 关键词：laser spectroscopy ; nuclear charge radius ; isotope shift ; halo nucleus ; lithium
- 刊名：Hyperfine Interactions
- 出版时间：July, 2006
- 出版年：2006
- 期刊代码：18_03043843
- 类别：cp
- 卷：171
- 期：1-3
- 页码：181-188
- 数据来源：sp
摘要
We have determined the nuclear charge radius of 11Li by high-precision laser spectroscopy. The experiment was performed at the TRIUMF-ISAC facility where the 7Li-11Li isotope shift (IS) was measured in the 2s→3s electronic transition using Doppler-free two-photon spectroscopy with a relative accuracy better than 10−5. The accuracy for the IS of the other lithium isotopes was also improved. IS’s are mainly caused by differences in nuclear mass, but changes in proton distribution also give small contributions. Comparing experimentally measured IS with advanced atomic calculation of purely mass-based shifts, including QED and relativistic effects, allows derivation of the nuclear charge radii. The radii are found to decrease monotonically from 6Li to 9Li, and then increase with 11Li about 11%larger than 9Li. These results are a benchmark for the open question as to whether nuclear core excitation by halo neutrons is necessary to explain the large nuclear matter radius of 11Li; thus, the results are compared with a number of nuclear structure models.