Investigation of the low-lying isomer in 229Th by collinear laser spectroscopy
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A new ion beam of 229Th is available at the Jyväsklyä IGISOL facility, produced from the α decay of 233U. A small branching ratio (≈ 2%) is believed to populate the inferred low-lying (5.5 eV) isomeric state in 229Th. A laser ionization scheme is currently being developed to improve the yield of 229Th from the source. The ion source uses a novel electric field configuration for fast and efficient extraction of α-recoils and is able to provide beams of short lived (τ≥ 30 ms) radioactive nuclei. Identification of the isomeric state by collinear laser spectroscopy will reduce the lower lifetime limit of the state and provide the first direct evidence for its existence.
Key words229Th laser ionization collinear laser spectroscopy
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