1. Barcelona, 21 de maig de 2010

2. 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

3. Research objectives: “Nuclear data for physics and nuclear engineering” DetectorIGISOL systemEfficiency  252 CfAnalysisIntroduction 3/20  Neutron emission after beta decay Exotic nuclei? BETA

4. Research objectives DetectorIGISOL systemEfficiency  252 CfAnalysisIntroduction 4/20  Neutron emission from beta decay

5. Research objectives DetectorIGISOL systemEfficiency  252 CfAnalysisIntroduction 5/20  Example of exotic nuclei to study neutron BETA

6. Research objectives DetectorIGISOL systemEfficiency  252 CfAnalysisIntroduction 6/20  Example of exotic nuclei to study neutron BETA

7. 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.

8. Detector structure DetectorIGISOL systemEfficiency  252 CfAnalysisIntroduction Detector 8/20 Introduction

9. 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

10. Electronic chain for data acquisition and signal processing DetectorIGISOL systemEfficiency  252 CfAnalysisIntroduction Detector 10/20 Software implementat: GASIFIC  Fitxers binaris

11. 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 :

12. DetectorIGISOL systemEfficiency  252 CfAnalysisIntroduction IGISOL system IGISOL layout 12/20 1- Ion guide 2- k130 cyclotron beamline 3- beam dump 4- acceleration chamber 5- dipole magnet (mass separation “A”) 6- switchyard 7- RFQ cooler 8- tandem penning trap 9- miniquadrupole deflector 10- electrostatic deflector and beamline to upper floor 11- experimental setups

13. 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

14. 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

15. Detector Sistema Efficiency  252 CfAnalysisIntroduction IGISOL system Photos &Pictures 15/20

16. 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)

17. DetectorIGISOL systemEfficiency  252 CfAnalysisIntroduction Efficiency  252 Cf  Gamma detector calibration 17/20 59,5keV 661,5keV 1173 y 1332,5keV 1460keV (K-40) Energy calibration : Am-241, Cs-137 & Co-60 mixt source 122keV, 344,3keV, 411keV, 778,9keV, 867,4keV, 964keV, 1112keV,1408keV Efficiency calibration: Eu-152 source Uncertainty obtained: 7,5%

18. DetectorIGISOL systemExperimentAnalysisIntroduction Efficiency  252 Cf Cf-252 Activity 18/20  Cf-252 spectrum Spectrum area with interesting peaks: 1313keV, 1435keV & 1506keV Zoom

19. 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

20. 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

21. Links of interest http://www.baeturia.com/neutronassos/ https://www.jyu.fi/fysiikka/en/research/accelerator/ S’ha acabat!... ???