Observation of a highly directional γ-ray beam from ultrashort, ultraintense laser pulse interactions with solids

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作者：
Norreys, P.A.
Santala, M.
Clark, E.
Zepf, M.
Watts, I.
Beg, F.N.
Krushelnick, K.
Tatarakis, M.
Dangor, A.E.
Fang, X.
Graham, P.
McCanny, T.
Singhal, R.P.
Ledingham, K.W.D.
Creswell, A.
Sanderson, D.C.W.
Magill, J.
Machacek, A.
Wark, J.S.
Allott, R.
Kennedy, B.
Neely, D.
机构：
[1] Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom
[2] Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BZ, United Kingdom
[3] Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
[4] Scottish Universities Research, Reactor Centre, East Kilbride, Glasgow G75 0QU, United Kingdom
[5] European Commission, Institute for Transuranic Elements, Postfach 2340, Karlsruhe, D-76125, Germany
[6] Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
来源：
Physics of Plasmas | 1999年 / 6卷 / 5 I期
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摘要：
Novel measurements of electromagnetic radiation above 10 MeV are presented for ultra intense laser pulse interactions with solids. A bright, highly directional source of y rays was observed directly behind the target. The y rays were produced by bremsstrahlung radiation from energetic electrons generated during the interaction. They were measured using the photoneutron reaction [63Cu(γ,n)62Cu] in copper. The resulting activity was measured by coincidence counting the positron annihilation γ rays which were produced from the decay of 62Cu. New measurements of the bremsstrahlung radiation at 1019 W cm-2 are also presented. © 1999 American Institute of Physics.
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页码：2150 / 2156
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