n_TOF annual meeting 13-15 December 2011, Lisbon Analysis of 63Ni(n,g) Claudia Lederer University of Vienna n_TOF annual meeting 13-15 December 2011, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Motivation 63Ni branching point in weak s process in massive stars 64Zn 66Zn 67Zn 65Zn 63Cu 64Cu 65Cu 66Cu 62Ni 63Ni 64Ni 65Ni core He burning, kT=25 keV, Nn~106 cm-3 Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Motivation 63Ni branching point in weak s process in massive stars 64Zn 66Zn 67Zn 65Zn 63Ni MACS crucial for expected 63Cu abundances !! 63Cu 64Cu 65Cu 66Cu 62Ni 63Ni 64Ni 65Ni Pignatari et al. (2010) core He burning, kT=25 keV, Nn~106 cm-3 C shell burning, kT=90 keV, Nn~1011 cm-3 Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon 63Ni measurement (20 mm Ø) samples measured (protons for filter runs in brackets): Configuration thickness (a/b) protons (x1017)* purpose 63Ni 2.846e-3 18.9 (3.3) cross section 62Ni 6.203e-3 9.7 (1.1) background 197Au 0.584e-3 normalization Sample holder - 2.6 (1.0) Carbon 84.55e-3 0.6 (1.9) background n-scatt Empty 1.6 (0.6) * dedicated pulses, extracted by TTOFsort Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon 63Ni sample Original material (TU Munich, G. Korschinek, T. Faestermann): 62Ni sample irradiated in thermal reactor (in 1984 and 1992) total mass: 1002 mg enrichment in 63Ni: ~13 % (= 131.8 mg) contaminants: ~15.4 mg 63Cu After chemical separation at PSI (D. Schumann): NiO powder, 1156 mg (919 mg Ni) 63Ni/62Ni=0.134 (=108.4 mg) Container: PEEK (C20H12O3) <0.01 mg 63Cu PEEK container had 180 mg total mass Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Detector calibration calibration sources: Cs (Eg=662 keV), Y (Eg=898,1836keV), AmBe (Eg= 4.44 MeV) C6D6  detection of compton edge simulation of energy deposition in C6D6 liquid GEANT4 geometry by IFIC Valencia assume resolution function s2=a*E+b*E2 Y source (898,1836keV) Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Detector calibration Calibration: calibration needs to be good up to approx. 9 MeV (Sn 63Ni !!) last energy point of sources: 4.44 MeV: 63Ni Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Detector calibration Calibration: calibration needs to be good up to approx. 9 MeV (Sn 63Ni !!) last energy point of sources: 4.44 MeV  Use also 62Ni and 63Ni amplitude spectrum (strong transitions at Sn) Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Statistics Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Statistics Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Weighted Spectra: WFs: Ethres=250 keV IFIC Geometry Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Weighted Spectra Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Beam Off background 63Ni Dummy (1 pos from 63Ni) 62Ni (2 pos from 63Ni) 57Fe Campaign 58Ni Campaign Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Beam Off background dedicated parasitic Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Beam Off background Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Normalization 4.9 eV resonance in Au Normalization: Au(4.9 eV): 0.601 Au(4.9 eV) 2009: 0.661 Fe(1.15 keV) 2009: 0.629 Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Normalization 4.9 eV resonance in Au Normalization: Au(4.9 eV): 0.601 Au(4.9 eV) 2009: 0.661 Fe(1.15 keV) 2009: 0.629 Cross section at thermal: Au: 91.8 b (98 ENDF) 62Ni: 12.6 b (14.1 ENDF) 62Ni(2009): 14.1 b (Emin=1eV) Energy dependence of beam interception? Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Normalization Experimental Beam Interception 2011 (F. Belloni) 10-2-10-1 eV: 0.622  7.2 % lower 1-10 eV: 0.667 100 eV – 1keV: 0.618  7.9 % lower Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Normalization Experimental Beam Interception 2011 (F. Belloni) 10-2-10-1 eV: 0.622  7.2 % lower 1-10 eV: 0.667 100 eV – 1keV: 0.618  7.9 % lower Experimental Beam Interception Au and Fe 2011 thermal (2011): 6.7 % lower (wrt ENDF xs) 4.9 eV: 0.661 (2009), 0.601 (2011) 1keV: 0.629 (2009)  5 % lower Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon 62Ni 2011 vs. 62Ni 2009 2011 2009 Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon 62Ni 2011 vs. 62Ni 2009 2011 2009 Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon 62Ni 2011 vs. 62Ni 2009 2011 2009 Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon 63Ni yield 63Ni-sample 62Ni-sample Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon 63Ni yield 59Ni 63Ni-sample 62Ni-sample Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon 59Ni contamination ~ 0.06% Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon 63Ni yield 63Ni-sample 62Ni-sample Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon 63Ni yield 63Ni-sample 62Ni-sample Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon 63Ni yield 63Ni-sample 62Ni-sample Claudia Lederer n_TOF annual meeting, Lisbon

THANK YOU FOR YOUR ATTENTION

Detector calibration + resolution calibration needs to be good up to approx. 9 MeV (Sn 63Ni !!) last energy point of sources: 4.44 MeV  Use also 62Ni and 63Ni amplitude spectrum (strong transitions at Sn) Claudia Lederer n_TOF annual meeting, Lisbon

Detector calibration + resolution calibration needs to be good up to approx. 9 MeV (Sn 63Ni !!) last energy point of sources: 4.44 MeV  Use also 62Ni and 63Ni amplitude spectrum (strong transitions at Sn) Claudia Lederer n_TOF annual meeting, Lisbon

Detector calibration + resolution calibration needs to be good up to approx. 9 MeV (Sn 63Ni !!) last energy point of sources: 4.44 MeV  Use also 62Ni and 63Ni amplitude spectrum (strong transitions at Sn) Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Weighting functions Simulation of monoenergetic g-rays (1e7 particles each): 100, 200, 500, 700, 800 keV and 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 MeV Claudia Lederer n_TOF annual meeting, Lisbon

Claudia Lederer n_TOF annual meeting, Lisbon Weighting functions Simulation of monoenergetic g-rays (1e7 particles each): 100, 200, 500, 700, 800 keV and 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 MeV g threshold 250 keV WFs for samples Au, big Au 58,62,63Ni Claudia Lederer n_TOF annual meeting, Lisbon