Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 42: Instrumentation 14

HK 42.8: Vortrag

Mittwoch, 25. März 2015, 16:15–16:30, M/HS2

Polarisation and relaxation characteristics of 15 MeV proton irradiated polmeric materials at 1 K and at 2.5 T. — Timo Altfelde, Marcel Bornstein, Hartmut Dutz, Stefan Goertz, Roland Miebach, •Scott Reeve, Stefan Runkel, and Benjamin Streit — Physikalisches Institut, Bonn, Germany

The dynamic polarisation of nuclear spins requires the introduction of paramagnetic centres into potential target materials. A method of choice is the irradiation of such materials. A solid target material that can be handled at room temperature and in which the paramagnetic centre remains stable under theses conditions would have many advantages for nuclear and particle physics experiments. Initial indications are that the polymeric materials may fulfil these criteria. Foils of polyethylene and polypropylene of 0.18 mm thickness were irradiated with a 15 MeV proton beam at various doses and subsequently analysed under standard polarised target conditions of 2.5 T and 1 K. The influence of annealing on the radical structure and the resulting change in polarisation characteristics are presented.