Presentation on theme: "Barcelona, 21 de maig de 2010. Introduction: Research objectives Detector IGISOL system (Ion Guide Isotope Separator On-Line) Efficiency calculation "— Presentation transcript:
Introduction: Research objectives Detector IGISOL system (Ion Guide Isotope Separator On-Line) Efficiency calculation Cf-252 calibration Data analysis DetectorIGISOL systemEfficiency 252 CfAnalysisIntroduction Contents 2/20
Research objectives: “Nuclear data for physics and nuclear engineering” DetectorIGISOL systemEfficiency 252 CfAnalysisIntroduction 3/20 Neutron emission after beta decay Exotic nuclei? BETA
Research objectives DetectorIGISOL systemEfficiency 252 CfAnalysisIntroduction 4/20 Neutron emission from beta decay
Research objectives DetectorIGISOL systemEfficiency 252 CfAnalysisIntroduction 5/20 Example of exotic nuclei to study neutron BETA
Research objectives DetectorIGISOL systemEfficiency 252 CfAnalysisIntroduction 6/20 Example of exotic nuclei to study neutron BETA
Research objectives DetectorIGISOL systemEfficiency 252 CfAnalysisIntroduction 7/20 Applications: Some of them are close to the path of the astrophysical r process, the determination of the full beta strength could help to improve theoretical models used for the calculation of beta decay properties (region A~90) Nuclear reactor safety. (Decay heat, fission reaction control) International projects collaboration: Development and testing instrumentation for the FAIR facility (DESPEC collaboration) Physics knowledge: Study different aspects of the decay of these nuclei and hence provide very complete information about their decay mechanism and structure.
Reaction DetectorIGISOL systemEfficiency 252 CfAnalysisIntroduction Detector 9/20 Mechanisms of detecting neutrons are based on indirect methods 3 He + n → 3 H + 1 H + 765 keV ions n n n Polyethylene moderator Proportional counter
Electronic chain for data acquisition and signal processing DetectorIGISOL systemEfficiency 252 CfAnalysisIntroduction Detector 10/20 Software implementat: GASIFIC Fitxers binaris
DetectorIGISOL systemEfficiency 252 CfAnalysisIntroduction IGISOL system Ion Guide Isotope Separator On-Line: Detector Nuclei production 11/20 ISOLTRAPISOLTRAP at CERN, Geneva, Switzerland SHIPTRAPSHIPTRAP at GSI, Darmstadt, Germany LEBITLEBIT at MSU, East Lansing, Michigan, USA TITANTITAN at TRIUMF, Vancouver, Canada CPTCPT at ANL, Argonne, Illinois, USA TRIGA-TRAPTRIGA-TRAP at Univ. of Mainz, Germany Study of short-lived (T 1/2 >1us) : The nuclei of interest have to be produced and immediately used for the experiments Separation of the nuclei of interest from other contaminants Very pure ion beam is achieved Other Traps for radioactive ions :
Detector Sistema Efficiency 252 CfAnalysisIntroduction IGISOL system Ion guide Ions are transported by a gas flow out of the gas cell and injected to the high vacuum section for further acceleration and mass separation. Basic idea: To slow down and thermalize initially energetic recoil ions from nuclear reactions in gas. Tipically Helium. 13/20
Detector Sistema Efficiency 252 CfAnalysisIntroduction IGISOL system JYFL trap 14/20 Applying successive dipole and quadripole rf fields which lead to mass-selective cooling and centering according to: Possibility of producing isobarically purified ion beams B/w c =m (A) /q JYFLTRAP is an ion trap system for cooling, bunching and isobaric purification of radioactive ion beams produced at IGISOL Main applications are mass and Q-value measurements of exotic nuclei and preparation isobarically or even isomerically pure beams for decay spectroscopy experiments
Detector Sistema Efficiency 252 CfAnalysisIntroduction IGISOL system Photos &Pictures 15/20
DetectorIGISOL systemEfficiency 252 CfAnalysisIntroduction Efficiency 252 CfIGISOL system Detector experimental efficiency 16/20 -Spontaneous fission sourceCf-252 Uncertainty 15% aprox! -Fission products to analyze gamma peaks: 136 I (1313keV) 138 Cs (1435keV) 140 La (1596keV)
DetectorIGISOL systemEfficiency 252 CfAnalysisIntroduction Analysis Single measures 19/20 GENIE (MCA/PC data transfer + peak analysis) [@dest + @source + lengt + aa aa 03 + ctrl + data + + nºpack + ctrl + lengt + ctrl 0 +lengt + real data] (See excel file) Wireshark as data package capture LLC Protocol Efficiency 252 Cf PalmTop Cheaper system according uses ATOMKI group (Hungary) Free licence software
DetectorIGISOL systemEfficiency 252 CfAnalysisIntroduction Analysis Data analysis 19/20 ROOT: OTHER: Go4 (GSI) GASIFIC implemented and developed by IFIC (UV) in C++ using ROOT libraries: Cern development, multifunctional software, programable - Binary file adquisition - Generate user root files to analyze - Modify correlation time between beta & neutron emittion
Links of interest http://www.baeturia.com/neutronassos/ https://www.jyu.fi/fysiikka/en/research/accelerator/ S’ha acabat!... ???
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