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|Title:||NEPTUNE - The New Isomer Spectrometer at IRMM|
|Authors:||OBERSTEDT STEPHAN; GAWRYS M.; LOEVESTAM GOERAN; OBERSTEDT Andreas; PLOMPEN ARJAN; SEMKOVA Valentina|
|Citation:||Proceedings of the NEMEA-3 Neutron Measurements, Evaluations and Applications p. 93-97|
|Publisher:||Office for Official Publications of the European Communities|
|Type:||Articles in periodicals and books|
|Abstract:||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.|
|JRC Institute:||Institute for Reference Materials and Measurements|
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