Detectors in the FASA experiments

Piotr Morawski

Supervisor:

dr Waldemar Karcz

Presentation’s outline

1. Detectors setup2. FASA experiment3. Detectors characterisctic

Detectors setup - location

• 64 thin scintillators (CsI(Tl))

• 30 telescopes - dE(gas)xE(Si(Al))

Detectors setup - schema

Detectors setup – pictures - 1

Detectors setup – pictures - 2

FASA experiment - introduction

Field of research: Thermal

multifragmentation

Nuclear phase transitions (liquid-gas, liquid-fog)

FASA experiment - Thermal multifragmentation

Thermal multifragmentation is an exotic multibody decay, which is the main decay channel for a hot nuclear systems

Due to multifragmentation the hot nuclei (E* ~ 500 – 700MeV) emits many intermediate mass fragments (IMF)

FASA experiment - Thermal multifragmentation

This plot gives us the information on the particle charge and energy

Measuring charge characteristic give us the value of ρt

Measuring energy characteristic give us the value of ρf

FASA experiment - Nuclear fase transitions - 1

We use term phase transition in nuclear physics because similarity between Van der Waals force and nuclear force (liquid drop model)

Liquid – normal state of nuclear matter in nuclei

Fog – mixed state of liquid droplets (IMF) and nuclear gas

FASA experiment - Nuclear phase transitions - 2

Liquid – gas transition takes place at temperature Tc = 20±3 MeV

Liquid – fog transition takes place at temperature Tb = 5-7 MeV

Detectors characterisctic

A = - 31.32±2.52

B = 254.95±1.02

Detectors characterisctic

Detectors characterisctic

The End

I’d like to thanks: Dr Waldemar Kracz Director Dmitri V. Fursaev Dr Wladislaw Chmielowski Dr Roman Zawodny