München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 57: Kernphysik/Spektroskopie

HK 57.4: Vortrag

Freitag, 24. März 2006, 14:45–15:00, C

NEPTUNE - NEw Pulsed and TUneable NEutron source for isomer spectroscopy — •Stephan Oberstedt¹, Andreas Oberstedt², Goeran Loevestam¹, Carlos Chaves de Jesus¹, Thierry Gamboni¹, Wouter Geerts¹, and Ricardo Jaime Tornin¹ — ¹EC-JRC IRMM, Retieseweg 111, BE-2440 Geel — ²Dep. Nat. Scienes, Oerebro University, SE-701 82 Oerebro

In the frame of the exploratory research initiative of the JRC a new pulsing device has been installed on the 0^o-beamline of the 7 MV Van-de-Graaff accelerator at the IRMM to produce pulsed quasi mono-energetic neutron beams in the MeV range. The pulse width may be tuned from 10 µs up to several hundreds of ms with a repetition rate between 1 Hz and 5 kHz. Duty cycle and repetition rate of the pulsed neutron source may be selected independently. The aim of the device is to study the decay of short-lived activation products between pulses in an essentially neutron-free environment. For the detection of isomer decay the spectrometer may be equipped with an ionisation chamber, with neutron detectors and high-resolution germanium detectors. A first application was dedicated to the search of the shape-isomer decay in ²³⁹U, for which the existance has been announced in 1998 [1].

The layout of the NEPTUNE isomer spectrometer and first scientific results will be presented together with a proposal to investigate the super-deformed minimum in the non-fissile uranium isotopes ²³⁵U and ²³⁷U.

[1] S. Oberstedt and F. Gunsing, Nucl. Phys. A636 (1998) 129