Absolute photoneutron cross sections for Zr, I, Pr, Au, and Pb

Berman, B. L.; Pywell, R. E.; Dietrich, S.S.; Thompson, M.N.; McNeill, K. G.; Jury, J. W.

doi:10.1103/physrevc.36.1286

Cited by 164 publications

(132 citation statements)

References 15 publications

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“…TLO parametrization without minor strength (full black line), minor strength included (thick blue line) and a SLO fit from Ref. [15] compared with experimental data for 197 Au: The (γ ,n) data [18,24] (black data points) are scaled with 0.9 photon scattering data [25] are shown as magenta data symbols.…”

Section: Averaged Neutron Capture Cross Sectionsmentioning

confidence: 99%

Breaking of axial symmetry in excited nuclei as identified in experimental data

2017

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Abstract.A phenomenological prediction for radiative neutron capture is presented and compared to recent compilations of Maxwellian averaged cross sections and average radiative widths. Photon strength functions and nuclear level densities near the neutron separation energy are extracted from data without the assumption of axial symmetry -at variance to common usage. A satisfactory description is reached with a small number of global parameters when theoretical predictions on triaxiality (from constrained HFB calculations with the Gogny D1S interaction) are inserted into conventional calculations of radiative neutron capture. The photon strength is parametrized using the sum of three Lorentzians (TLO) in accordance to the dipole sum rule. The positions and widths are accounted for by the droplet model with surface dissipation without locally adjusted parameters. Level densities are influenced strongly by the significant collective enhancement based on the breaking of axial symmetry. With the less stringent requirement of invariance against rotation by 180 • a global set of parameters which allows to describe the photon strength function and the level densities in the nuclear mass range from mass number 50 < A < 250 is found.

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Section: Averaged Neutron Capture Cross Sectionsmentioning

confidence: 99%

Breaking of axial symmetry in excited nuclei as identified in experimental data

2017

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“…Results for 148 Sm are displayed in Figure 3 along with existing measurements from Saclay which overestimate our data by approximately 20%, as is the case for all our Sm data. This systematic discrepancy was observed also by [13][14][15].…”

Section: Preparatory Experimentsmentioning

confidence: 45%

Photoneutron cross section measurements on Sm isotopes

Filipescu

Utsunomiya

Camera

et al. 2015

EPJ Web of Conferences

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Abstract.The Extreme Light Infrastructure -Nuclear Physics, one of the three pillars of the Extreme Light Infrastructure Pan-European initiative, is a new large scale facility dedicated to nuclear physics with extreme electromagnetic fields. ELI-NP will host two 10 PW lasers and a very brilliant Gamma beam system with unprecedented intensity and energy resolution parameters. We propose to perform photon induced nuclear reactions using the very brilliant γ-ray beams provided by the Gamma beam system to examine in detail the photon absorption process and its decay modes. Here the experimental program related to nuclear research on reactions above the neutron separation threshold, which is under preparation at ELI-NP, is presented.

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“…There are well-known significant (up to 100%) discrepancies between the results of those two laboratories for the same nuclei [2][3][4]. Those discrepancies are clearly systematic: as a rule (γ , 1n) reaction cross sections have larger values at Saclay but (γ , 2n) reaction cross sections vice versa at Livermore.…”

Section: Introductionmentioning

confidence: 82%

Photoneutron reaction cross sections from various experiments – analysis and evaluation using physical criteria of data reliability

et al. 2017

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Abstract. The majority of photonuclear reaction cross sections important for many fields of science and technology and various data files (EXFOR, RIPL, ENDF, etc.) supported by the IAEA were obtained in experiments using quasimonoenergetic annihilation photons. There are well-known systematic discrepancies between the partial photoneutron reactions (γ , 1n), (γ , 2n), (γ , 3n). For analysis of the data reliability the objective physical criteria were proposed. It was found out that the experimental data for many nuclei are not reliable because of large systematic uncertainties of the neutron multiplicity sorting method used. The experimentally-theoretical method was proposed for evaluating the reaction cross sections data satisfying the reliability criteria. The partial and total reaction cross sections were evaluated for many nuclei. In many cases evaluated data differ noticeably from both the experimental data and the data evaluated before for the IAEA Photonuclear Data Library. Therefore it became evident that the IAEA Library needs to be revised and updated.

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Absolute photoneutron cross sections for Zr, I, Pr, Au, and Pb

Cited by 164 publications

References 15 publications

Breaking of axial symmetry in excited nuclei as identified in experimental data

Breaking of axial symmetry in excited nuclei as identified in experimental data

Photoneutron cross section measurements on Sm isotopes

Photoneutron reaction cross sections from various experiments – analysis and evaluation using physical criteria of data reliability

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