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Title:
Direct detection of the 229Th nuclear clock transition
Authors:
von der Wense, Lars; Seiferle, Benedict; Laatiaoui, Mustapha; Neumayr, Jürgen B.; Maier, Hans-Jörg; Wirth, Hans-Friedrich; Mokry, Christoph; Runke, Jörg; Eberhardt, Klaus; Düllmann, Christoph E.; Trautmann, Norbert G.; Thirolf, Peter G.
Affiliation:
AA(Ludwig-Maximilians-Universität München, 85748 Garching, Germany; ), AB(Ludwig-Maximilians-Universität München, 85748 Garching, Germany), AC(GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany; Helmholtz-Institut Mainz, 55099 Mainz, Germany), AD(Ludwig-Maximilians-Universität München, 85748 Garching, Germany), AE(Ludwig-Maximilians-Universität München, 85748 Garching, Germany), AF(Ludwig-Maximilians-Universität München, 85748 Garching, Germany), AG(Helmholtz-Institut Mainz, 55099 Mainz, Germany; Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany), AH(GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany; Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany), AI(Helmholtz-Institut Mainz, 55099 Mainz, Germany; Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany), AJ(GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany; Helmholtz-Institut Mainz, 55099 Mainz, Germany), AK(Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany), AL(Ludwig-Maximilians-Universität München, 85748 Garching, Germany)
Publication:
Nature, Volume 533, Issue 7601, pp. 47-51 (2016). (Nature Homepage)
Publication Date:
05/2016
Origin:
NATURE
Abstract Copyright:
(c) 2016: Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.
DOI:
10.1038/nature17669
Bibliographic Code:
2016Natur.533...47V

Abstract

Today’s most precise time and frequency measurements are performed with optical atomic clocks. However, it has been proposed that they could potentially be outperformed by a nuclear clock, which employs a nuclear transition instead of an atomic shell transition. There is only one known nuclear state that could serve as a nuclear clock using currently available technology, namely, the isomeric first excited state of 229Th (denoted 229mTh). Here we report the direct detection of this nuclear state, which is further confirmation of the existence of the isomer and lays the foundation for precise studies of its decay parameters. On the basis of this direct detection, the isomeric energy is constrained to between 6.3 and 18.3 electronvolts, and the half-life is found to be longer than 60 seconds for 229mTh2+. More precise determinations appear to be within reach, and would pave the way to the development of a nuclear frequency standard.
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