1. Bucharest-Magurele, Romania M. BOROMIZA - Trieste, October, 2017
Inelastic scattering cross sections of protons and neutrons on 16O and 28Si
Marian BOROMIZA
Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH)
Bucharest-Magurele, Romania
M. BOROMIZA - Trieste, October, 2017

2. M. BOROMIZA - Trieste, October, 2017
PRESENTATION OUTLINE
In both experiments we used a QUARTZ (SiO2) TARGET
neutron and proton data: 16O Si
scientific motivation
experimental setup – only protons
(n, n’γ)
(p, p’γ)
results
both for 16O and 28Si
future work
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M. BOROMIZA - Trieste, October, 2017

3. M. BOROMIZA - Trieste, October, 2017
SCIENTIFIC MOTIVATION
for neutrons: - 16O and 28Si are nuclei of interest for nuclear applications: HPRL
for protons: - 16O: there are no inelastic angle integrated gamma production cross sections
under 8 MeV + some discrepancies in the already available data
- 28Si: very scarce inelastic data at energies higher than 6.5 MeV
physical reasons:
for a better nuclear reaction modelling
28Si(n, n’g) 28Si versus 25Mg(a, ng) 28Si Phys. Rev. C 88, (2013)
coupled with
Bohr hypothesis for CN
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M. BOROMIZA - Trieste, October, 2017

4. M. BOROMIZA - Trieste, October, 2017
SCIENTIFIC MOTIVATION
Not the same CN but making use of the isospin symmetry
PRESENT EXPERIMENTS
16O(p, p’g) 16O versus 16O(n, n’g) 16O
28Si(p, p’g) 28Si versus 28Si(n, n’g) 28Si
measured at EC-JRC Geel
published
measured at EC-JRC Geel
16O: N=Z nucleus
28Si: N=Z nucleus
3/19
M. BOROMIZA - Trieste, October, 2017

5. M. BOROMIZA - Trieste, October, 2017
SCIENTIFIC MOTIVATION
Not the same CN but making use of the isospin symmetry
PRESENT EXPERIMENTS
16O(p, p’g) 16O versus 16O(n, n’g) 16O
28Si(p, p’g) 28Si versus 28Si(n, n’g) 28Si
measured at EC-JRC Geel
published
measured at EC-JRC Geel
16O: N=Z nucleus
28Si: N=Z nucleus
4/19
M. BOROMIZA - Trieste, October, 2017

6. M. BOROMIZA - Trieste, October, 2017
SCIENTIFIC MOTIVATION
Not the same CN but making use of the isospin symmetry
PRESENT EXPERIMENTS
16O(p, p’g) 16O versus 16O(n, n’g) 16O
measured at EC-JRC Geel
Partial level schemes
16O: N=Z nucleus
5/19
M. BOROMIZA - Trieste, October, 2017

7. M. BOROMIZA - Trieste, October, 2017
goals of the two experiments:
mainly to provide both precise and reliable proton and neutron data mostly for
the inelastic channel
but also:
to investigate if and to which extent the neutron inelastic cross-sections can be
inferred from the ones induced by charged particles (i.e. protons in our case)
to extract information about the manifestation of the isospin symmetry in the reaction mechanisms themselves (i.e mainly CN) but also on the values of the extracted cross sections
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M. BOROMIZA - Trieste, October, 2017

8. M. BOROMIZA - Trieste, October, 2017
EXPERIMENTAL SETUPS
Nuclear reactions:
Neutron inelastic scattering cross section measurements (EC-JRC Geel)
Charged particles inelastic scattering cross section measurements (IFIN-HH, Bucharest)
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M. BOROMIZA - Trieste, October, 2017

9. M. BOROMIZA - Trieste, October, 2017
EXPERIMENTAL SETUP
TANDEM facility, IFIN-HH, Bucharest
at IFIN-HH, Tandem facility in
November 2015
two HPGe detectors
100% relative efficiency
placed at 110o and 150o
distance: cm and cm
target: SiO2 (quartz) with an areal
density of mg/cm2
Ep MeV, with 1 MeV steps
efficiency measurements using a 152Eu
calibration source + extrapolation via
MCNP simulations
acquisition: digital ( TNT MHz
and 14 bits)
8/19
M. BOROMIZA - Trieste, October, 2017

10. M. BOROMIZA - Trieste, October, 2017
DATA ANALYSIS
protons: absolute cross sections
(Faraday cup)
gamma spectroscopy
techniques
with HPGe detectors
neutrons: data normalization to 235U(n, fission)
standard cross section via a FC
main extracted quantity: angle integrated γ-production cross section
Data corrections: dead time (protons case), MSC and gamma sample
attenuation (neutrons case) +
Detector efficiency extrapolations via MCNP codes + experimental points
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M. BOROMIZA - Trieste, October, 2017

11. M. BOROMIZA - Trieste, October, 2017
RESULTS
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12. M. BOROMIZA - Trieste, October, 2017
RESULTS AND DISCUSSION E0
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13. M. BOROMIZA - Trieste, October, 2017
RESULTS AND DISCUSSION
OXYGEN data:
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14. M. BOROMIZA - Trieste, October, 2017
RESULTS AND DISCUSSION
OXYGEN data:
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15. M. BOROMIZA - Trieste, October, 2017
RESULTS AND DISCUSSION
SILICON data:
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16. M. BOROMIZA - Trieste, October, 2017
RESULTS AND DISCUSSION
SILICON data:
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M. BOROMIZA - Trieste, October, 2017

17. M. BOROMIZA - Trieste, October, 2017
RESULTS AND DISCUSSION
SILICON data:
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18. M. BOROMIZA - Trieste, October, 2017
RESULTS AND DISCUSSION
SILICON data:
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M. BOROMIZA - Trieste, October, 2017

19. M. BOROMIZA - Trieste, October, 2017
FUTURE WORK
Detailed comparisons and data discussion of the neutron and proton corresponding
cross sections from the two experiments:
28Si(p, p’g) 28Si vs. 28Si(n, n’g) 28Si
and
16O(p, p’g)16O vs. 16O(n, n’g)16O
Maybe, gaining extra insight into the reaction mechanisms by tuning some of the
TALYS 1.8 input parameters to better describe our particular data
Concluding & Publishing the 16O and 28Si results
Future experiment proposals with other nuclei along the N=Z line but also
out of it (for example 58Ni or 57Fe)
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M. BOROMIZA - Trieste, October, 2017

20. M. BOROMIZA - Trieste, October, 2017
THANK YOU!
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M. BOROMIZA - Trieste, October, 2017