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Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept. 2007. Manipulated Gamma Spectroscopy:

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Presentation on theme: "Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept. 2007. Manipulated Gamma Spectroscopy:"— Presentation transcript:

1 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Manipulated Gamma Spectroscopy: Methodologies and Applications Saed Dababneh Al-Balqa Applied University, JORDAN. Forschungszentrum Karlsruhe, GERMANY. University of Notre Dame, USA. Joint Institute for Nuclear Astrophysics, USA. CERN.

2 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Why … ? Efficiency Signal-to-Background Ratio Correction Factors Interference True Coincidence (Summing) Random Coincidences … For What …? Nuclear Structure Environmental Material Nuclear Astrophysics Medical Industrial … Composite detectors Online vs. offline histogramming Coincidence/anticoincidence …

3 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Classical Compton Suppression Online signal processing and hardware gating. Anticoincidences. Kill good events !!!

4 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Detector Spheres Cost Room Availability Passive Shielding

5 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Detector Spheres

6 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Chronic Corrections Geometry (Extended Source) Self Absorption True Coincidence Summing Random Coincidences Last Year !!

7 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Stellar Evolution (Overview)

8 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Thermonuclear Resonant Reactions Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Energy Cross section ECEC Resonance Strength Low energy ? Barrier penetration Yield 2 2 Background ?? Q Target Projectile Compound Nucleus

9 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Specific Problem Neutron sources for the s-process 14 N(, ) 18 F( + ) 18 O(, ) 22 Ne(,n) 12 C(p, ) 13 N( + ) 13 C(,n) At temperatures of interest: Reaction rate is dominated by 2 resonances; 470 & 566 keV. Never observed directly ! Estimated resonance strengths. Now: Improved detection sensitivity. Measured resonance strengths. 18 O Ne

10 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept How … ? Close Geometry Granularity (if available) Offline Analysis Timing Cosmic Suppression Random Coincidences Cascade Coincidences Measured Corrections Simulated Corrections Avoid Calculations based on assumptions …

11 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Experimental Setup for Accelerators

12 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept

13 Multiplicities

14 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Cosmic Suppression

15 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Random Coincidences

16 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Addback vs. Direct Mode

17 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Addback vs. Direct Mode

18 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Summing-in and -out

19 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Doppler Correction

20 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Various Modes of Operation Ignore scintillation No suppression. Anticoincidences Use Pl. Scintillator Cosmic suppression. Use BGO Compton suppression. Coincidences (w/o cosmic suppression) Window on Clover + BGO Q-value gating. BGO window Cascade coincidences. Clover addback window Summing-in. Clover crystal window Summing-out.

21 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Ultimate Data Reduction Cosmic suppression. Cascade coincidences. Random coincidences. Signal-to-background ratio…!!! Offline

22 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Detection Sensitivity Low-energy ultra-weak resonance. 10 days beam on target.

23 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Detection Sensitivity

24 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Detection Sensitivity

25 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Detailed Coincidences R Modes 1 & 2 are accounted for. Partial strength. Bypasses over first excited state?

26 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept D Spectra

27 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept So what ? Improved detection sensitivity. Bypass verification. Weakest resonances detected. Target stability. Quantified reaction rate. Physical Review C 68, (2003)

28 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Setup for Small Samples Sample measured with 2 Clover detectors in close geometry. Each Clover consists of 4 HPGe crystals. Nearly 4π geometry High efficiency.

29 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Singles vs. Coincidences Phys. Rev. C (2004)

30 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Close geometry summing. Classical correction needs TOTAL efficiency MC total efficiency If MC why not MC Summing correction Validate MC What about efficiency for coincidences?? Monte Carlo (Remember 2006…!!)

31 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Correction Factor using Experimental Data 16 % in Direct Mode Confirmed by MC Nuclear Instruments and Methods in Physics Research A 517 (2004)

32 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Finally … Get spirit of ideas and apply to your setup Invest in yourself

33 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept Many Thanks Acknowledgement Franz Käppeler, Michael Heil, Rene Reifarth, Ralf Plag, Iris Dillmann, Michael Wiescher, Joachim Görres, Nikolas Patronis, Shawn OBrien.

34 Saed Dababneh. Seventh Symposium on Use of Nuclear Techniques in Environmental Studies. Yarmouk University, JORDAN. 3-5 Sept

35

36 Again: Addback vs. Direct


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