Summer practice 2014 Detection of charge particles generated in - - PowerPoint PPT Presentation

Grzegorz Kamiński Joint Institute for Nuclear Research, Dubna, 141980 Dubna, Russia Institute of Nuclear Physics, 31-342 Krakow, Poland

Summer practice 2014

Seicean Alexandru Babes-Bolyai University, Cluj Napoca Romania Konrad Wysogląd Maria Curie- Sklodowska University, Lublin Poland

Detection of charge particles generated in heavy ions collisions at low energies

Area of study at ACCULINNA

light exotic nuclei, especially ‘super heavy’ hydrogen (5,7H) and helium (8,10He) isotopes proton emitting nuclei

ACCULINNA separator

typical beams delivered from the U−400M cyclotron:

6,7Li,11B,18O @ 33 AMeV, 20Ne, 32S @ 50 AMeV

main parameters Max magnetic rigidity 3.6 Tm Solid angle 0.9 msr H/V acceptance 20/14 mrad Momentum acceptance 4.2-8.4 %

3H(8He,p)10He

Primary reaction

11B(33AMeV)+9Be -> 8Be+frag

Key equipment of the ACCULINNA separator

Cryogenic tritium target system & correlation measurements Stilbene detectors & developement of 64-modules neutron array Optical Time Projection Chamber (OTPC) at ACCULINNA (collaboration with University of Warsaw) OTPC Cryogenic tritium target cell stilbene detectors crystal size 80( ) x 50 mm3

DEMON modules

p

6,8He 6,8He

n

Veto detector Si telescope

3H target

10 cm

3 8 10

H( He, ) He p

3 6 8

H( He, ) He p

proton telescope

n

8,10He

beam

3.1 m

AMP S.C.A HV 600V= PMT CsI(Tl) γ PK

CsI(Tl) detector – how it works?

M.C.A PC Software

1.17 1.33 MeV 60Co

TTL

CsI(Tl) detector

CsI(Tl) example spectra

Optical Time Projection Chamber (OTPC)

Digital photography of single decay events A new type of ionization chamber with optical readout (OTPC) dedicated to studies of exotic and rare nuclear decays.

What is OTPC ?

OTPC – developed at the Warsaw University. The idea has come from M. Pfϋtzner and W. Dominik .The goal was to build the detector for direct observation of 2p emission from 45Fe .

OTPC – How does it work?

OTPC – How does it work?

OTPC – How does it work?

Gas Electron Multiplier (GEM) foils

OTPC – How does it work?

OTPC – How does it work?

OTPC – event reconstruction

OTPC – main view

• M. Ćwiok et al., IEEE TNS, 52 (2005) 2895
• K. Miernik et al., NIM A581 (2007) 194

CCD 2/3’’

• 512 512 pix
• 14-bits
• image ampl.

( 1200) PMT 5’’

HI

gas pressure (1atm) :

OTPC – example picture

48Ni

p p

48Ni 48Ni 2p

2p p p picture from CCD time profile of pmt signals

OTPC is very effective for investigations of rear decay branches of exotic nuclei in a wide halflife time (1 1000 ms)

LISE++

LISE++

Thank you for your attention! 