The HADRON detector systems


The HADRON detectors are scintillator detector arrays used for detecting charged particles (protons and pions) in electron scattering experiments. Built and operated jointly by the AmPS physics group of NIKHEF and the nuclear physics department of the Vrije Universiteit Amsterdam, they were used in one- and two-proton knockout experiments at the AmPS beam endstation EMIN and at the internal target facility ITH. Review it in the (now historical) photo gallery.
The story continues in Mainz (Germany) with a new range of experiments at A1.

The detectors

* Mechanical design and contruction
* Hadron3 and Hadron4
* Hadron data acquisition
* Targets
* Online operating documentation
* Hadron detector tuning
* General data acquisition system and slow control (GLOBE)

The experiments

These detectors were designed to study reaction with a small cross section. This can either be a reaction with a small integrated cross section or for example a study of the interference structure functions. Both kinds of experiments need the large solid angle subtended by the HADRON arrays to collect enough counts to accurately determine the cross section. At the same time, the large solid angle allows us to cover a extended kinematical range in `one shot'. As this larger solid angle gives out-of-plane acceptance, it becomes feasable to perform a measurement of the out-of-plane structure functions with reduces systematic error. For the measurement of the two-proton knockout cross section, the availability of these detectors is of vital importance.

* List of experiments and publications on-line

News update:

* Correlations and Current in 3He Studied with the (e,e'pp) Reaction

The future

With the modular electronics designed for the HADRON detectors, it is possible to deploy the HADRON detector pack and accompanying read-out system in other facilities, now AmPS has shut down. In line with the highly successful triple coincidence measurements, experiments to measure additional channels, especially (e,e'pn), have been proposed to the PAC of Mainzer Microtron (MAMI). In these experiments, groups from the Gutenberg Universitaet Mainz, Tuebingen and Glasgow collaborate.

Proposed experiments:
* Electron-induced pn knockout from 3He at MAMI-A1.


List of collaborators

List of References

Comments to the maintainer: David Groep (davidg@nikhef.nl)