1. Zirconium capture measurements:
INFN Bari
N. Colonna
G. Tagliente
INFN Trieste
K. Fujii
P.M. Milazzo
C. Moreau
ITN Lisboa
L.Marques
P.Vaz R
in Paris
Zirconium capture measurements:
data analysis results,
perspectives

2. Physics case s-process analysis of great interest in stellar modeling (e.g. evolution of Red Giant stars) nuclear reactor design purpose nuclear waste transmutation
90 neutron magic number (N=50)
Act as a bottle neck for the reaction flow
towards heavier elements
90, 91, 92, 93, 94
Low-neutron capture cross sections,
predominantly of s-process origin
(existing data have uncertainties larger than 10%)
93 radioactive isotope
One of the major long-lived fission products (T½ = 1.5 Myr)
Used in reactor’s structural materials
96 r-process only
Relevant in the study of pulsing AGB stars

3. Physics case, Nuclear Astrophysics (n,g) x-sections of Zr
Bottleneck in the s-process flow at N=50 neutron magic number
Small x-sections
Normalization of s-process abundance
Probing the neutron exposure and neutron flux in
Red Giant Stars
TOF 08

4. Zr capture Yields Zr Yield Overall background Stable isotopes, 2003
Natural radioactivity of the sample

5. Estimated resonance parameters E, Γg, Γn
Resonance analysis
Normalization
197Au
4.9eV
Resonance Fit
Zr-92 data 1 2 3 4
N.F.(92Zr)=0.6219
SAMMY fit of 92Zr 1 2 3 4
Estimated resonance parameters E, Γg, Γn

6. Resonance analysis typical examples90 91 96
94Zr
En=58.7keV 94
… multiple scattering correction, Doppler broadening and instrumental resolution
were included in the analysis

7. Data analysis Sntof 14% lower than the previous data
Gnntof 7% lower than the previous data

8. Data analysis Sntof 19% lower than the previous data
Gnntof 3% lower than the previous data

9. Data analysis Sntof 14% lower than the previous data
Gnntof 1% lower than the previous data

10. Data analysis Sntof 4% higher than the previous data
Gnntof 3% higher than the previous data

11. Data analysis Sntof 25% lower than the previous data
Gnntof 12% lower than the previous data

12. Data analysis
Mughabghab 2006
Mughabghab 1986

13. Energy range investigated(KeV)
Data analysis
Energy range investigated(KeV)
n_TOF
RRR(KeV)
Jendl3.3
90Zr
91Zr
92Zr
2 – 40
2 – 120
94Zr
96Zr
0.17 – 42
0.3 – 96

14. Data analysis MACS @ 30 KeVZr
(En range KeV)
nTOF data
(mb)
Jendl 3.3
Correction factor (k) 90
( )
14.6
17.2
0.85 91
( )
32.6
37.8
0.86 92
(2-40)
25.8
30.4 94
(2.2-74) 26
23.5
1.1 96
( )
6.2
11.1
0.6

15. Data analysis MACS @ 30 KeVZr
nTOF data
(mb)
Corrected by k
Jendl 3.3 90
18.5
18.1
21.2 91
36.6
36.
41.85 92
39.7
37.7
44.3 94
27.4
27.6
24.9 96
7.5
6.9
12.4

16. Data analysis MACS @ 30 KeVZr
nTOF data
(mb)
Bao 90
18.1±1
21±2 91
51.6±2
60±8 92
37.7±2
33±4 94
27.6±1
26±1 96
7.5±0.4
10.7±0.5

17. Data analysis open questions
Isotope
En (eV)
K with 96Zr K
Diff % 91
159.4
0,383
0,02
182.0
8,45
8,44
-0,08
292,7
141,4
130,2
7,73
449,9
4,84
5,27
8,09
681,7
83,6
94,6
-13,1
893,3
27,2
26,9
1,29
3862,9
121,6
125,5
3,09 90
3864,4
71,8
76,9
6,65
4008,4
151,6
139,4
-8,78
96Zr Analysis

18. Data analysis open questions
91 on 91 sample
91 on 96 sample
En = eV
ΔS/S ~ 13%
En = eV
ΔS/S ~ 1%
not related to wrong sample components definition

19. (almost) ready to publish how to proceed?
A paper for each isotope (because of the difference in Gg)
Two papers of the Astrophysics implication of all stable isotopes