skip to main content

DOE PAGESDOE PAGES

Title: Laser photodetachment of radioactive 128 I -

The first experimental investigation of the electron affinity (EA) of a radioactive isotope has been conducted at the CERN-ISOLDE radioactive ion beam facility. The EA of the radioactive iodine isotope 128I ($t$ 1/2 = 25 min) was determined to be 3.059 052(38) eV. The experiment was conducted using the newly developed Gothenburg ANion Detector for Affinity measurements by Laser PHotodetachment (GANDALPH) apparatus, connected to a CERN-ISOLDE experimental beamline. 128I was produced in fission induced by 1.4 GeV protons striking a thorium/tantalum foil target and then extracted as singly charged negative ions at a beam energy of 20 keV. Laser photodetachment of the fast ion beam was performed in a collinear geometry inside the GANDALPH chamber. Neutral atoms produced in the photodetachment process were detected by allowing them to impinge on a glass surface, creating secondary electrons which were then detected using a channel electron multiplier. The photon energy of the laser was tuned across the threshold of the photodetachment process and the detachment threshold data were fitted to a Wigner law function in order to extract the EA. In conclusion, this first successful demonstration of photodetachment at an isotope separator on line facility opens up the opportunity for future studiesmore » of the fundamental properties of negatively charged radioactive isotopes such as the EA of astatine and polonium.« less
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [6] ;  [7] ;  [8] ;  [6] ;  [8] ;  [9] ; ORCiD logo [10] ;  [6] ;  [2] ;  [4] ;  [6] ;  [8] ;  [8] ;  [3]
  1. European Organization for Nuclear Research (CERN), Geneva (Switzerland); Univ. of Gothenburg (Sweden). Dept. of Physics; Univ. of Manchester (United Kingdom). School of Physics and Astronomy
  2. European Organization for Nuclear Research (CERN), Geneva (Switzerland); Univ. of Gothenburg (Sweden). Dept. of Physics
  3. Univ. of Gothenburg (Sweden). Dept. of Physics
  4. European Organization for Nuclear Research (CERN), Geneva (Switzerland); Johannes Gutenberg Univ., Mainz (Germany). Inst. of Physics
  5. European Organization for Nuclear Research (CERN), Geneva (Switzerland); Univ. of Manchester (United Kingdom). School of Physics and Astronomy
  6. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  7. Friedrich Schiller Univ., Jena (Germany). Inst. of Optics and Quantum Electronics
  8. Johannes Gutenberg Univ., Mainz (Germany). Inst. of Physics
  9. Inst. Laue-Langevin (ILL), Grenoble (France)
  10. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Physics Division
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 2013-4084
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. G, Nuclear and Particle Physics
Additional Journal Information:
Journal Volume: 44; Journal Issue: 10; Journal ID: ISSN 0954-3899
Publisher:
IOP Publishing
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); Swedish Research Council (SRC); German Bundesministerium für Bildung und Forschung (BMBF); European Commission (EU)
Country of Publication:
United States
Language:
English
Subject:
07 ISOTOPE AND RADIATION SOURCES; ISOLDE; electron affinity; iodine; photodetachment
OSTI Identifier:
1422472

Rothe, Sebastian, Sundberg, Julia, Welander, Jakob, Chrysalidis, Katerina, Goodacre, Thomas Day, Fedosseev, Valentin, Fiotakis, Spyridon, Forstner, Oliver, Heinke, Reinhard, Johnston, Karl, Kron, Tobias, Köster, Ulli, Liu, Yuan, Marsh, Bruce, Ringvall-Moberg, Annie, Rossel, Ralf Erik, Seiffert, Christoph, Studer, Dominik, Wendt, Klaus, and Hanstorp, Dag. Laser photodetachment of radioactive 128 I -. United States: N. p., Web. doi:10.1088/1361-6471/aa80aa.
Rothe, Sebastian, Sundberg, Julia, Welander, Jakob, Chrysalidis, Katerina, Goodacre, Thomas Day, Fedosseev, Valentin, Fiotakis, Spyridon, Forstner, Oliver, Heinke, Reinhard, Johnston, Karl, Kron, Tobias, Köster, Ulli, Liu, Yuan, Marsh, Bruce, Ringvall-Moberg, Annie, Rossel, Ralf Erik, Seiffert, Christoph, Studer, Dominik, Wendt, Klaus, & Hanstorp, Dag. Laser photodetachment of radioactive 128 I -. United States. doi:10.1088/1361-6471/aa80aa.
Rothe, Sebastian, Sundberg, Julia, Welander, Jakob, Chrysalidis, Katerina, Goodacre, Thomas Day, Fedosseev, Valentin, Fiotakis, Spyridon, Forstner, Oliver, Heinke, Reinhard, Johnston, Karl, Kron, Tobias, Köster, Ulli, Liu, Yuan, Marsh, Bruce, Ringvall-Moberg, Annie, Rossel, Ralf Erik, Seiffert, Christoph, Studer, Dominik, Wendt, Klaus, and Hanstorp, Dag. 2017. "Laser photodetachment of radioactive 128 I -". United States. doi:10.1088/1361-6471/aa80aa. https://www.osti.gov/servlets/purl/1422472.
@article{osti_1422472,
title = {Laser photodetachment of radioactive 128 I -},
author = {Rothe, Sebastian and Sundberg, Julia and Welander, Jakob and Chrysalidis, Katerina and Goodacre, Thomas Day and Fedosseev, Valentin and Fiotakis, Spyridon and Forstner, Oliver and Heinke, Reinhard and Johnston, Karl and Kron, Tobias and Köster, Ulli and Liu, Yuan and Marsh, Bruce and Ringvall-Moberg, Annie and Rossel, Ralf Erik and Seiffert, Christoph and Studer, Dominik and Wendt, Klaus and Hanstorp, Dag},
abstractNote = {The first experimental investigation of the electron affinity (EA) of a radioactive isotope has been conducted at the CERN-ISOLDE radioactive ion beam facility. The EA of the radioactive iodine isotope 128I ($t$ 1/2 = 25 min) was determined to be 3.059 052(38) eV. The experiment was conducted using the newly developed Gothenburg ANion Detector for Affinity measurements by Laser PHotodetachment (GANDALPH) apparatus, connected to a CERN-ISOLDE experimental beamline. 128I was produced in fission induced by 1.4 GeV protons striking a thorium/tantalum foil target and then extracted as singly charged negative ions at a beam energy of 20 keV. Laser photodetachment of the fast ion beam was performed in a collinear geometry inside the GANDALPH chamber. Neutral atoms produced in the photodetachment process were detected by allowing them to impinge on a glass surface, creating secondary electrons which were then detected using a channel electron multiplier. The photon energy of the laser was tuned across the threshold of the photodetachment process and the detachment threshold data were fitted to a Wigner law function in order to extract the EA. In conclusion, this first successful demonstration of photodetachment at an isotope separator on line facility opens up the opportunity for future studies of the fundamental properties of negatively charged radioactive isotopes such as the EA of astatine and polonium.},
doi = {10.1088/1361-6471/aa80aa},
journal = {Journal of Physics. G, Nuclear and Particle Physics},
number = 10,
volume = 44,
place = {United States},
year = {2017},
month = {8}
}