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

Summer practice 2014 Detection of charge particles generated in heavy ions collisions at low energies Seicean Alexandru Konrad Wysogląd Babes-Bolyai Maria Curie- University, Cluj Sklodowska Napoca University, Lublin Romania Poland Grzegorz Kamiński Joint Institute for Nuclear Research, Dubna, 141980 Dubna, Russia Institute of Nuclear Physics, 31-342 Krakow, Poland

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

ACCULINNA separator typical beams delivered from the U − 400M cyclotron: 6,7 Li, 11 B, 18 O @ 33 AMeV, 20 Ne, 32 S @ 50 AMeV 3 H( 8 He,p) 10 He Primary reaction 11 B(33AMeV)+ 9 Be -> 8 Be+frag 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 %

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) Cryogenic tritium target cell stilbene detectors OTPC crystal size 80( ) x 50 mm 3 3 6 8 6,8 He H( He, ) He p DEMON modules 6,8 He 3 8 10 H( He, ) He p n 8,10 He 6,8 He 8,10 He beam n 3.1 m p 3 H target Si telescope Veto detector proton telescope 10 cm

CsI(Tl) detector – how it works? γ CsI(Tl) PK PMT PC Software HV 600V= 1.17 1.33 MeV M.C.A 60 Co AMP S.C.A TTL

CsI(Tl) detector

CsI(Tl) example spectra

Optical Time Projection Chamber (OTPC) What is OTPC ? A new type of ionization chamber with optical readout (OTPC) dedicated to studies of exotic and rare nuclear decays. Digital photography of single decay events OTPC – developed at the Warsaw University. The idea has come from M. Pf ϋ tzner and W. Dominik .The goal was to build the detector for direct observation of 2 p emission from 45 Fe .

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 HI CCD 2/3’’ gas pressure • 512 512 pix (1atm) : • 14-bits • image ampl. ( 1200) PMT 5’’ M. Ćwiok et al., IEEE TNS, 52 (2005) 2895 K. Miernik et al., NIM A581 (2007) 194

OTPC – example picture 48 Ni 2p OTPC is very effective for investigations of rear decay branches of exotic nuclei in a wide halflife time (1 1000 ms) p p 2p 48 Ni 48 Ni p p picture from CCD time profile of pmt signals

LISE++

LISE++

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