Developments for resonance ionization laser spectroscopy of the heaviest elements at SHIP
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- 作者：F. Lautenschlä ; ger<sup>asup><sup> ; sup><sup>bsup> ; P. Chhetri<sup>asup><sup> ; sup><sup>bsup> ; D. Ackermann<sup>bsup> ; H. Backe<sup>dsup> ; M. Block<sup>bsup><sup> ; sup><sup>csup><sup> ; sup><sup>dsup> ; B. Cheal<sup>gsup> ; A. Clark<sup>bsup> ; C. Droese<sup>esup><sup> ; sup><sup>bsup> ; R. Ferrer<sup>hsup> ; F. Giacoppo<sup>bsup><sup> ; sup><sup>csup> ; S. Gö ; tz<sup>bsup><sup> ; sup><sup>csup> ; F.P. Heß ; berger<sup>bsup><sup> ; sup><sup>csup> ; O. Kaleja<sup>asup> ; J. Khuyagbaatar<sup>bsup><sup> ; sup><sup>csup> ; P. Kunz<sup>fsup> ; A.K. Mistry<sup>bsup><sup> ; sup><sup>csup> ; M. Laatiaoui<sup>bsup><sup> ; sup><sup>csup> ; W. Lauth<sup>dsup> ; S. Raeder<sup>bsup><sup> ; sup><sup>csup><sup> ; sup><sup>s.raeder@gsi.de" class="auth_mail" title="E-mail the corresponding authorsup> ; Th. Walther<sup>asup> ; C. Wraith<sup>gsup>
- 关键词：Resonance ionization spectroscopy ; Gas stopping cell ; Radiation Detected Resonance Ionization Spectroscopy ; Ytterbium ; Nobelium
- 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
- 出版年：2016
- 出版时间：15 September 2016
- 年：2016
- 卷：383
- 期：Complete
- 页码：115-122
- 全文大小：2128 K
文摘
The experimental determination of atomic levels and the first ionization potential of the heaviest elements (<span id="mmlsi23" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168583X1630266X&_mathId=si23.gif&_user=111111111&_pii=S0168583X1630266X&_rdoc=1&_issn=0168583X&md5=1d790d33920f124900a54d68b8d01656" title="Click to view the MathML source">Z⩾100span><span class="mathContainer hidden"><span class="mathCode">span>span>span>) is key to challenge theoretical predictions and to reveal changes in the atomic shell structure. These elements are only artificially produced in complete-fusion evaporation reactions at on-line facilities such as the GSI in Darmstadt at a rate of, at most, a few atoms per second. Hence, highly sensitive spectroscopic methods are required. Laser spectroscopy is one of the most powerful and valuable tools to investigate atomic properties. In combination with a buffer-gas filled stopping cell, the Radiation Detected Resonance Ionization Spectroscopy (RADRIS) technique provides the highest sensitivity for laser spectroscopy on the heaviest elements. The RADRIS setup, as well as the measurement procedure, have been optimized and characterized using the <span id="mmlsi24" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168583X1630266X&_mathId=si24.gif&_user=111111111&_pii=S0168583X1630266X&_rdoc=1&_issn=0168583X&md5=0e1233178749809e818716d4ef33258b" title="Click to view the MathML source">αspan><span class="mathContainer hidden"><span class="mathCode">span>span>span>-emitter <span id="mmlsi1" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168583X1630266X&_mathId=si1.gif&_user=111111111&_pii=S0168583X1630266X&_rdoc=1&_issn=0168583X&md5=e06ac1cc4cc31a3da79025c184a9788d" title="Click to view the MathML source"><sup>155sup>span><span class="mathContainer hidden"><span class="mathCode">span>span>span>Yb in on-line conditions, resulting in an overall efficiency well above 1%. This paves the way for a successful search of excited atomic levels in nobelium and heavier elements.