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FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Fission fragment angular distributions and.

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Presentation on theme: "FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Fission fragment angular distributions and."— Presentation transcript:

1 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Fission fragment angular distributions and isotopic distributions L. Tassan-Got and n_TOF and SOFIA

2 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions 232 Th fission fragment angular distribution (FFAD) Detection of the 2 fission fragments Fission direction given by the positions of the 2 fragments 9 Targets and 10 detectors tilted by 45° 1x 235 U 1x 238 U 1x 237 Np 6x 232 Th

3 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Examples of angular distributions

4 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions

5 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Rules of thumb for FFADs

6 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions

7 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Fissility effect Lower fissility higher barrier lower temperature lower K 0 lower K’s higher positive anisotropy

8 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Anisotropy for p+X at 40 MeV

9 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions

10 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Systematics of linear momentum transfer At 40 MeV almost full momentum transfer: in most of the cases the proton is captured by the target nucleus

11 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions SOFIA experiment From courtesy of J. Taieb, T. Corbinet, J. Fiona-Martin, E. Pellereau, A. Chatillon

12 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions 238 U Z 1 +Z 2 =92 selection

13 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Mass resolution

14 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Fission of 238 U: mass yield

15 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Even-odd effect=10% ( ~14 MeV) vs Lohengrin=24% ( =6 MeV) Even-odd effect decreases with excitation energy Fission of 238 U: charge yield

16 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Fission of 238 U: isotopic yields for heavy fragment

17 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Fission of neutron deficient nuclei x K.H. Schmidt et al., Nucl. Phys. A665 (2000) 221

18 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions

19 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Fission of neutron deficient nuclei

20 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Fission of neutron deficient nuclei

21 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Fission of neutron deficient nuclei

22 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Energetics of Sn isotopes for fission of 235 U <>=N f - N 1 - Courtesy of Julie Fiona-Martin

23 FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got Fission fragment angular distribution and isotopic distributions Even-odd effect=5% ( ~14 MeV) vs Lohengrin=5% ( =6 MeV) Evaporation ? Fission of 238 U: isotonic yield

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