NEPTUNE - The New Isomer Spectrometer at IRMM
A new spectrometer has been built at the EC-JRC IRMM to investigate isomer decay in the millisecond range and activation cross-sections of isotopes, where isomeric states exist and are populated. The spectrometer uses high-resolution ¿-ray detectors and an ionisation chamber for the measurement of charged particles, e. g. fission fragments. NEPTUNE provides pulsed quasi mono-energetic neutrons at pulse repetition frequencies up to 5 kHz and tuneable neutron pulse widths. For this purpose a beam chopper based on a parallel-plate condenser has been integrated into the accelerator beam-line in order to deflect the charged-particle beam onto a tantalum beam dump.
An instrument status report is given together with results from first experiments dedicated to the search for shape isomers in 235,239U performed with the NEPTUNE isomer spectrometer.
OBERSTEDT Stephan;
GAWRYS M.;
LOEVESTAM Goeran;
OBERSTEDT Andreas;
PLOMPEN Arjan;
SEMKOVA Valentina;
2008-01-17
Office for Official Publications of the European Communities
JRC41910
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