232 Th fission fragment angular distribution (FFAD)
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Transcript of 232 Th fission fragment angular distribution (FFAD)
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
Fission fragment angular distributionsand isotopic distributions
L. Tassan-Got and n_TOF and SOFIA
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
232Th 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°• 1x235U 1x238U 1x237Np 6x232Th
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
Examples of angular distributions
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
Rules of thumb for FFADs
220
TJK eff
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
Fissility effect
Lower fissility higher barrier lower temperature lower K0
lower K’s higher positive anisotropy
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
Anisotropy for p+X at 40 MeV
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
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
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
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
238U Z1+Z2=92 selection
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
Mass resolution
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
Fission of 238U: mass yield
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
• Even-odd effect=10% (<E*>~14 MeV) vs Lohengrin=24% (<E*>=6 MeV)• Even-odd effect decreases with excitation energy
Fission of 238U: charge yield
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
Fission of 238U: isotopic yields for heavy fragment
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
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
Fission of neutron deficient nuclei
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
Fission of neutron deficient nuclei
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
Fission of neutron deficient nuclei
FUSTIPEN - Caen – 13/10/2014 L. Tassan-Got
Fission fragment angular distribution and isotopic distributions
Energetics of Sn isotopesfor fission of 235U <𝜈>=Nf - N1 - <N2>
Courtesy of Julie Fiona-Martin