Feasibility study of internal conversion electron spectroscopy of 229mTh

  title={Feasibility study of internal conversion electron spectroscopy of 229mTh},
  author={Benedict Seiferle and Lars C. von der Wense and Peter G. Thirolf},
  journal={The European Physical Journal A},
Abstract.With an expected energy of 7.8(5) eV, the isomeric first excited state in 229Th exhibits the lowest excitation energy of all known nuclei. Until today, a value for the excitation energy has been inferred only by indirect measurements. In this paper we propose an experimental method that is potentially capable of measuring the ground-state transition energy via the detection of the internal conversion electrons. MatLab-based Monte Carlo simulations have been performed to obtain an… 

Toward an energy measurement of the internal conversion electron in the deexcitation of the Th229 isomer

The first excited isomeric state of Th-229 has an exceptionally low energy of only a few eV and could form the gateway to high-precision laser spectroscopy of nuclei. The excitation energy of the

The concept of laser-based conversion electron Mössbauer spectroscopy for a precise energy determination of 229mTh

Abstract229Th is the only nucleus currently under investigation for the development of a nuclear optical clock (NOC) of ultra-high accuracy. The insufficient knowledge of the first nuclear excitation

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh.

The presented method allowed for a first direct identification of the decay of the thorium isomer, laying the foundations to study its decay properties as prerequisite for an optical control of this nuclear transition.

Improving Our Knowledge on the 229mThorium Isomer: Toward a Test Bench for Time Variations of Fundamental Constants

For more than four decades, the lowest excitation in the whole landscape of atomic nuclei, the low‐lying, isomeric state of 229Th, the so‐called thorium isomer, has challenged physicists of various

The 229-thorium isomer: doorway to the road from the atomic clock to the nuclear clock

The elusive ‘thorium isomer’, i.e. the isomeric first excited state of 229Th, has puzzled the nuclear and fundamental physics communities for more than 40 years. With an exceptionally low excitation

Nuclear clocks for testing fundamental physics

The low-energy, long-lived isomer in 229Th, first studied in the 1970s as an exotic feature in nuclear physics, continues to inspire a multidisciplinary community of physicists. It has stimulated

The 229\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$^{229}$$\end{document}Th isomer: prospects for a nuclear optica

The proposal for the development of a nuclear optical clock has triggered a multitude of experimental and theoretical studies. In particular the prediction of an unprecedented systematic frequency

Attempt to optically excite the nuclear isomer in Th229

We aim to perform direct optical spectroscopy of the $^{229}\mathrm{Th}$ nuclear isomer to measure its energy and lifetime, and to demonstrate optical coupling to the nucleus. To this end, we develop

Towards a 229Th-Based Nuclear Clock

An overview of the current status of the development of a nuclear clock based on the state of lowest known nuclear excitation energy in 229Th is presented and potential candidates for nuclear clocks other than 229Th are discussed.

The $$^{229}$$Th isomer: prospects for a nuclear optical clock

The proposal for the development of a nuclear optical clock has triggered a multitude of experimental and theoretical studies. In particular the prediction of an unprecedented systematic frequency



Excitation of the isomeric 229mTh nuclear state via an electronic bridge process in 229Th+.

Based on calculations of the electronic level structure of Th+ which combine the configuration-interaction method and many-body perturbation theory, it is estimated that a nuclear excitation rate in the range of 10  s⁻¹ can be obtained using conventional laser sources.

Towards a direct transition energy measurement of the lowest nuclear excitation in229Th

The isomeric first excited state of the isotope 229Th exhibits the lowest nuclear excitation energy in the whole landscape of known atomic nuclei. For a long time this energy was reported in the

Experimental search for the low-energy nuclear transition in 229Th with undulator radiation

To search for the lowest energy nuclear isomeric transition in 229Th in solid samples, a novel adsorption technique which prepares 229Th atoms on a surface of CaF2 is developed. Adsorbed 229Th is

The search for the existence of 229mTh at IGISOL

An overview of preparatory work aiming at the identification of the low-lying 7.6 eV isomer in 229Th through a measurement of its hyperfine structure is presented. A 233U recoil gas cell has been

Prospects for measuring the 229Th isomer energy using a metallic magnetic microcalorimeter☆

  • G. KazakovV. Schauer T. Schumm
  • Physics
    Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
  • 2014

Energy splitting of the ground-state doublet in the nucleus 229Th.

The energy splitting of the 229Th ground-state doublet is measured to be 7.6+/-0.5 eV, significantly greater than earlier measurements. Gamma rays produced following the alpha decay of 233U (105

Nuclear laser spectroscopy of the 3.5 eV transition in Th-229

We propose high-resolution laser spectroscopy of the 3.5 eV nuclear transition in Th-229 in isolated atoms. Laser excitation of the nucleus can be detected efficiently in a double-resonance method by

Lifetime Measurement of the ^{229}Th Nuclear Isomer.

The measurement of the internal-conversion decay half-life of neutral ^{229m}Th has been measured, which is in the range of theoretical predictions and gives further support for an internal conversion coefficient of ≈10^{9}, thus constraining the strength of a radiative branch in the presence of internal conversion.

A VUV detection system for the direct photonic identification of the first excited isomeric state of 229Th

With an expected energy of 7.6(5) eV, 229Th possesses the lowest excited nuclear state in the landscape of all presently known nuclei. The energy corresponds to a wavelength of about 160 nm and would

Impact of the electron environment on the lifetime of the 229 Th m low-lying isomer

The question of the lifetime of the {sup 229}Th{sup m} low-lying isomer is considered in light of current experimental research. A strong effect of the electron shell on lifetime is demonstrated,