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DPG

Berlin 2001 – scientific programme

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P: Plasmaphysik

P 3: Dense Plasmas

P 3.4: Talk

Tuesday, April 3, 2001, 17:15–17:30, 2053

Photoneutron production with table-top TW lasers — •Stefan Düsterer1, Rolf Behrens2, Christian Ziener1, Heinrich Schwoerer1, and Roland Sauerbrey11Inst. für Optik und Quantenelektronik, Uni Jena — 2Physikalisch-Technische Bundesanstalt, Braunschweig

We report on the photofission of nuclei with a TW Ti:sapphire laser. For the first time nuclei were split by the use of a table-top laser system.
Extremely hot plasma (Thot ∼ 500keV) is created when an intensive femtosecond laser pulse (5 × 1018 W cm−2) interacts with a solid high Z target. Electrons are accelerated by the laser within this plasma to energies of several MeV. They emit high energetic bremsstrahlung when they interact with the surrounding matter. X-rays with energies above the fission threshold of 1.67 MeV initiate the photofission of Be resulting in two alpha particles and a neutron: 9Be → 2 α + n. The neutrons were detected by another nuclear reaction. Gold nuclei were activated by 197Au + n → 198Au. The subsequent γ-decay of the 198Au was measured and showed that about 100 neutrons were produced per laser shot.
The production of neutrons with a compact table-top laser system enables medical applications. The needs and demands of radiology and their feasibility will be discussed.

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