NUCLEAR AND SUBNUCLEAR PHYSICS LABORATORY

Experimental Approach

Providing a good level of knowledge in the field of particle detectors used in nuclear and particle physics with the related electronics and data acquisition systems. Developing capabilities to use these strumentation in order to mount different typical experimental set for alpha particle energy and time of flight measurement, gamma spectrometry and coincidence measurement, particle identification with energy loss and pulse shape analysisi method, with practical data acquisition and analysis.

Classes on theoretical parts (3CFU)

Experimental sessions in laboratory with increasing degree of autonomy (3CFU)

Interaction radiation-matter

Charged particles: energy loss, range. Cherenckov effect. Transition radiation. Photon interaction: photoelectric, compton, pair production. Electromagnetic and adronic shower. neutron interactions. Simulation software for energy loss calculation.

General characteristic of detectors

Operative modes. Energy and time resolutions. Dead time. Efficiency. Activity measurement.

Gas detector

basic principles and working regime. Ionization chamber. proportional counters. Geiger_Muller counter. Multi Wire Proportional Chamber. Microstrip Gas Chamber. Drift chamber. Resistive Plate Chamber. Gas Electron Multiplier. Time Projection Chamber. Aging of gas detectors. Ionization chamber with liquid noble elements.

Scintillator detectors

Organic and inorganic scintillators: light production mechanisms. Cherenckov light. Light collection. Scintillating fibers. Wave Length Shifter. Photodetectors.

Soild state detectors

properties of semiconductors, doping, pn junction. Silicon detector. Photodetectors. Litium dritft detector. Hiper Pure germanium detectors. Segmented and drift detectors. Pixel detectors. Radiation damages.

Electronics

Characteristics and transport on analogical signals. Module for signal treatments: preamplifier, amplifier, discriminator, analog to digital converter. Integrated electronics. Characteristic and treatment of logical signals. Digitalization of signals.

Data Acquisition

Monoparametric acquistion system. Trigger systems. Multiparamentric data acquisition systems. Sofware for data acquisition and treatment.

Detection and identification methodologies

gamma spectrometry, compton soppression, doppler correction. Neutron detection and spectrometry. Energy loss measurement and particle identification. Time of flight and mass identification. Pulse shape discrimination for different detector. Momentum measurement and particle identification with magnetic deflectio. identification methods for particle physics. transition radiation detector. Calorimeters. Monte Carlo simulations of detection process.

Applicazione di tecniche nucleari

Ion Beam Analysis methodologies: RBS and PIXE. Examples of application to cultural heritage.

Radiaion detector in medical field. Scintillator and solid state detectors. Digital radiography. Computer thomography, single and double photon.

laboratory experiences:

gamma detection and high resolution spectrometry, gamma coincidence measurement, environemental radioactivity and source activity measurement.

Alpha particle detection with ionization chamber - silicon detector telescope.

Time of flight measurement of alpha particles with micoro channel plate and silicon detectors.

detection and pulse shape discrimination of alpha and gamma radiation with signal digitizer.

Ion beam measurement - PIXE and RBS - with singletron accelerator.

1) G.F. KNOLL, Radiation detection and Measurement, J.Wiley 1999

2) W.R. LEO, Techniques for nuclear and particle physics experiments, Springer-Verlag 1987-1994