Research on Isomer Decay with the NEPTUNE Spectrometer
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 is equipped with high-resolution gamma-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 ranging from 10 µs into the ms-region. For this purpose a beam chopper based on a parallel-plate capacitor has been integrated into the accelerator beam line in order to deflect the charged-particle beam onto a tantalum beam dump. First research has been performed with the NEPTUNE spectrometer dedicated to the shape isomer search in the odd-A uranium isotopes 235U, 237U and 239U. In further experiments the population of long-lived spin isomers was investigated.
OBERSTEDT Stephan;
OBERSTEDT Andreas;
PLOMPEN Arjan;
SEMKOVA Valentina;
LOEVESTAM Goeran;
GAWRYS M.;
2008-09-22
EDP Sciences
JRC47105
http://nd2007.edpsciences.org/,
https://publications.jrc.ec.europa.eu/repository/handle/JRC47105,
10.1051/ndata:07300,
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