The early measurements of the Nuclear Physics Group were centered around nuclear structure and enery levels, with but a few strong external collaborations there was no systematic long-term data-archiving in the current archive.

Lohengrin - Fission fragment spectrometer

This large precision instrument was essentially a double focussing mass spectrometer for analysing fission fragments induced by neutron bombardment on a source. This was sent along the beam tube towards the reactor. The fragments were quantified in mass and charge, scanning the electric and magnetic fields in the spectrometer. Data were initially sent to the NICOLE system, and subsequently PDP11/34 replacement. Later much development of detection systems with their own elecronics re-used the spectrometer as a source of ions for further research.

The Gamma-Ray spectrometers GAMS-I, GAMS-II, GAMS-III

These three instruments on the only through-beam tube at the reactor measured the gamma ray spectrum simultaneously in three complementary ranges of the same sample introduced near the reactor. The gamma rays were reflected off large perfect silicon crystal into detectors. The laser-controlled motions allowed detail spectroscopic surveys of nuclear energies and splittings to be made. The data were acquired on PDP11 computers and transferred to the central PDP10 initially on DECtapes (2.5MB pre-blocked 7-track low density magnetic tapes) as individual files. The only archiving was performed by the experimenters.

BILL, the conversion electron Spectrometer

This was installed on a vertical beam tube at level D. Again controlled by a PDP11 data were recorded as files and archived only by experimeters. The instrument was permanently shut down when the cold source was rebuilt without a suitable vertical beam tube.