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Laser photodetachment of radioactive I-128(-)

Journal article
Authors Sebastian Rothe
Julia Sundberg
Jakob Welander
K. Chrysalidis
T. D. Goodacre
V. Fedosseev
S. Fiotakis
O. Forstner
R. Heinke
K. Johnston
T. Kron
U. Koster
Y. Liu
B. Marsh
Annie Ringvall-Moberg
R. E. Rossel
C. Seiffert
D. Studer
K. Wendt
Dag Hanstorp
Published in Journal of Physics G-Nuclear and Particle Physics
Volume 44
Issue 10
ISSN 0954-3899
Publication year 2017
Published at Department of Physics (GU)
Language en
Keywords ISOLDE, electron affinity, iodine, photodetachment, electron-affinity, sapphire laser, astatine, isolde, isotopes, rilis, Physics
Subject categories Physical Sciences


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 I-128 (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 CERNI-SOLDE experimental beamline. I-128 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. 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.

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