Title: NEPTUNE - The New Isomer Spectrometer at IRMM
Authors: OBERSTEDT STEPHANGAWRYS M.LOEVESTAM GOERANOBERSTEDT AndreasPLOMPEN ARJANSEMKOVA Valentina
Citation: Proceedings of the NEMEA-3 Neutron Measurements, Evaluations and Applications p. 93-97
Publisher: Office for Official Publications of the European Communities
Publication Year: 2007
JRC N°: JRC41910
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC41910
Type: Contributions to Conferences
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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