Links between nuclear structure data and cross section measurements - - PowerPoint PPT Presentation

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Links between nuclear structure data and cross section measurements - - PowerPoint PPT Presentation

Aug 16, 2022 125 likes •459 views

Links between nuclear structure data and cross section measurements Adina Olacel Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH), Magurele, Romania Introduction Experimental physics Introduction Experimental

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Adina Olacel Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH), Magurele, Romania

Links between nuclear structure data and cross section measurements

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Introduction

Experimental physics

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Introduction

Experimental physics Nuclear reactions

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Introduction

Experimental physics Nuclear reactions Cross section measurements (n, n’g) reactions

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Introduction

  • A. Olacel et al., PRC 96, 014621 (2017)

Experimental physics Nuclear reactions Cross section measurements (n, n’g) reactions

primary data g-production cross section

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Introduction

g-production cross section level cross section primary data

  • ther data

Experimental physics Nuclear reactions Cross section measurements (n, n’g) reactions

  • A. Olacel et al., PRC 96, 014621 (2017)
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Introduction

Experimental physics Nuclear reactions

g-production cross section level cross section total inelastic cross section primary data

  • ther data

Cross section measurements (n, n’g) reactions

  • A. Olacel et al., PRC 96, 014621 (2017)
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Introduction

  • calculated using the g-production cross sections of the observed

transitions and based on the feeding and the decay of each level of interest. level cross section total inelastic cross section

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Introduction

  • calculated using the g-production cross sections of the observed

transitions and based on the feeding and the decay of each level of interest. level cross section total inelastic cross section Important to have a very good knowledge of the level scheme.

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Compared with theoretical calculations:

  • TALYS
  • EMPIRE

Very precise experimental data with very good neutron energy resolution

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Compared with theoretical calculations:

  • TALYS
  • EMPIRE

Very precise experimental data with very good neutron energy resolution Optical model potential

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Compared with theoretical calculations:

  • TALYS
  • EMPIRE

Very precise experimental data with very good neutron energy resolution Optical model potential

  • A. Olacel et al., Accepted for publication in EPJA
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Compared with theoretical calculations:

  • TALYS
  • EMPIRE

Very precise experimental data with very good neutron energy resolution Optical model potential

+

Structure information

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Compared with theoretical calculations:

  • TALYS
  • EMPIRE

Very precise experimental data with very good neutron energy resolution Optical model potential Structure information (branching ratios, spin, parity…)

+

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Examples - Branching ratios 48Ti

ENSDF

  • T. W. Burrows, Nucl. Data Sheets 107, 1747 (2006)
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Examples - Branching ratios 48Ti

ENSDF Reaction codes must make a decision about such decays. In many codes a direct transition to the g.s. is assumed.

  • T. W. Burrows, Nucl. Data Sheets 107, 1747 (2006)
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Examples - Branching ratios 48Ti

ENSDF TALYS 1.9 default Reaction codes must make a decision about such decays. In many codes a direct transition to the g.s. is assumed.

  • T. W. Burrows, Nucl. Data Sheets 107, 1747 (2006)
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Examples - Branching ratios 48Ti

ENSDF The experimental spectra were investigated to see if:

  • the TALYS-supposed g rays were observed;
  • other possible de-excitations from those levels were observed.

TALYS 1.9 default

  • T. W. Burrows, Nucl. Data Sheets 107, 1747 (2006)
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Examples - Branching ratios 48Ti

ENSDF The experimental spectra were investigated to see if:

  • the TALYS-supposed g rays were observed;
  • other possible de-excitations from those levels were observed.

TALYS 1.9 default

  • T. W. Burrows, Nucl. Data Sheets 107, 1747 (2006)
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Examples - Branching ratios 48Ti

ENSDF TALYS 1.9 default TALYS 1.9 modified

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Examples - Branching ratios

  • Impact

48Ti

The g-production cross section of the first transition

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Examples - Branching ratios

  • Impact

48Ti

The g-production cross section of the first transition

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Examples - Branching ratios 57Fe

ENSDF

  • M. R. Bhat, Nucl. Data Sheets 85, 415 (1998)
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Examples - Branching ratios 57Fe

TALYS

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Examples - Branching ratios 57Fe

TALYS EMPIRE

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Examples - Branching ratios 57Fe

TALYS EMPIRE The experimental spectra were investigated to see if:

  • the supposed g rays were observed;
  • other possible de-excitations from those levels were observed.
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Examples - Branching ratios 57Fe

TALYS EMPIRE The experimental spectra were investigated to see if:

  • the supposed g rays were observed;
  • other possible de-excitations from those levels were observed.
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Examples - Branching ratios

  • Impact

57Fe

  • A. Negret et al., PRC 96, 024620 (2017)
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Examples - Branching ratios

  • Impact

57Fe

TALYS describes better the transition de-exciting the 706.4-keV level despite the fact that the 433.5- keV g ray was not observed.

  • A. Negret et al., PRC 96, 024620 (2017)
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Examples - Branching ratios

  • Impact

57Fe

TALYS describes better the transition de-exciting the 706.4-keV level despite the fact that the 433.5- keV g ray was not observed. This suggests that there is a feeding

  • f this level presently unknown.
  • A. Negret et al., PRC 96, 024620 (2017)
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Conclusions

  • emphasize on the importance of nuclear structure data in the reaction

calculations.

  • present two experimental cases and the issues related to not knowing

the structure of the nuclei of interest.

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Thank you!