keV neutron capture and transmission measurements on 50Cr, 52Cr, 53Cr, 54Cr, 60Ni and V

Stieglitz, Robert; Hockenbury, R.W.; Block, Robert C.

doi:10.1016/0375-9474(71)90512-4

Cited by 62 publications

(19 citation statements)

References 17 publications

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“…: resonance in capture data and not at all in aiy total cross-section meas urements. It is shown inTable 11that the sum of the capture kernels of the three resonances reported in this work is equal to the capture kernel given by FrOhner 25 and is smaller than but in the range of the possible values given by Stieglitz 23. Even the three resonances around 139 keV, which are separated by half a keV, were not resolved before.…”

mentioning

confidence: 52%

Neutron transmission and capture measurements and analysis of /sup 60/Ni from 1 to 450 keV

Perey¹,

Harvey²,

Macklin³

et al. 1982

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High-resolution transmission and capture measurements of M Ni-enricned targets have been made at the Oak Ridge Electron Linear Accelerator (ORELA) from a few eV to 1800 keV in trarsmissior. and from 2.5 keV to 5 MeV in capture. The transmission data from I to 450 keV were analyzed with a muiti-level R-matrix code which uses the Bayes' theorem for the fitting process. This code provides the energies and neutron widths of toe resonances inside the 1-to 450-keV region as well as a possible parameterization for outside resonances to describe the smooth cross section in this region. The capture data were analyzed with a least-squares fitting code using the Breit-Wigner formula. From 2.S to 450 LeV, 166 resonances were seen in both sets of data. Correspondence between the energy scales shows a discontinuity around 300 keV which makes the matching of resonances at higher energies difficult. Eighty-nine resonances were seen in the capture data only. Average parameters for the '0 observed »wave resonances were deduced. The average level spacing D" was found to be equal to I5.2_± 1.5 keV, the strength function, S 0 , equal to (2.2 ± 0.6) X 10-4 and the average radiation width, H,, equal to 1.30 ± 0.07 eV. The staircase plot of the reduced level widths and the plot of the Lorentz-weighted strength function averaged over various energy intervals show possible evidence for doorway states. The level densities calculated with the Fermi-gas model for £ = 0 and for £ > 0 resonances were compared with the cumulative number of observed resonances, but the analysis is not conclusive. The average capture cross section as a function of the neutron incident energy is compared to the tail of the giant electric dipole resonance prediction. ? The experimental conditions of the capture measurements are given in Sect. 4 wiih a discussion of the various corrections applied to the raw data. The capture data analysis made with a least-squares fitting code using the Breit-Wigner formalism is reported in Sect. 5, Section 6 deals with problems encountered in the energy scales of the two sets of data. In Sect. 7, the resonance parameters obtained from the analysis of both data sets are reported and their uncertain ties discrised. Comparisons ?

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confidence: 52%

Neutron transmission and capture measurements and analysis of /sup 60/Ni from 1 to 450 keV

Perey¹,

Harvey²,

Macklin³

et al. 1982

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“…The full (dotted) line corresponds to the TALYS calculation obtained with the D1M+QRPA+0lim dipole strength obtained with C = 3 · 10 −8 MeV −3 (C = 10 −7 MeV −3 ). Experimental data are taken from[45][46][47][48][49][50]. The hashed areas correspond to the prediction uncertainties associated with different nuclear level density models.…”

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confidence: 99%

Photoneutron cross sections for Ni isotopes: Toward understanding (n,γ) cross sections relevant to weak s -process nucleosynthesis

et al. 2018

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Photoneutron cross sections were measured for 58 Ni, 60 Ni, 61 Ni, and 64 Ni at energies between the one-neutron and two-neutron thresholds using quasi-monochromatic γ-ray beams produced in laser Compton-scattering at the NewSUBARU synchrotron radiation facility. The new photoneutron data are used to extract the γ-ray strength function above the neutron threshold complementing the information obtained by the Oslo method below the threshold. We discuss radiative neutron capture cross sections and the Maxwellian-averaged cross sections for Ni isotopes including 63 Ni, a branching point nucleus along the weak s-process path. The cross sections are calculated with the experimentally constrained γ-ray strength functions from the Hartree-Fock-Bogolyubov plus quasiparticle-random phase approximation based on the Gogny D1M interaction for both E1 and M 1 components and supplemented with the M 1 upbend.

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“…The resonance structure of the neutron cross sections of the chromium isotopes is almost completely known (see [2] and [9]), so that the calculation of the resonances scattering lengths is possible according to (2). With the data from [9] the values Pa r given in lines 8 and 9 in Table 7 are obtained but which describe the contribution of resonances at positive neutron energy only.…”

Section: Comparison With Resonance Parametersmentioning

confidence: 99%

“…These data can be taken from R-matrix fits of resonance experiments [2] (given in Table 7, line 10) or from optical model calculations [12,15] (Table 7, lines 11 and 12). Results of such calculations with the optical model with imaginary potential for spherical nuclei [15] (curve 2a) are presented in Figure 5 besides the results obtained when still taking account of vibrational states [12].…”

Section: Comparison With Resonance Parametersmentioning

confidence: 99%

“…The isotopes of chromium have masses 50, 52, 53 and 54 within the concerned region of the 3 S-size resonance. In the past they were objects of many experiments to explore the resonance structure of the neutron cross section at neutron energies between 0.1 and 350keV [2]. Average capture cross sections, potential scattering radii, resonance widths and both s-wave and p-wave strength functions were determined.…”

Section: Introductionmentioning

confidence: 99%

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Interactions of slow neutrons with the chromium isotopes

1978

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Neutron transmission experiments and determinations of coherent scattering lengths were performed on natural chromium and enriched samples of 5~ S2Cr, 53Cr and 54Cr. By means of the Christiansen-filter-technique we obtained new values for the scattering lengths of the bound atoms: Data for incoherent and spin-state scattering and for the potential-scattering radius of the nuclei could be deduced from these results.

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keV neutron capture and transmission measurements on 50Cr, 52Cr, 53Cr, 54Cr, 60Ni and V

Cited by 62 publications

References 17 publications

Neutron transmission and capture measurements and analysis of /sup 60/Ni from 1 to 450 keV

Neutron transmission and capture measurements and analysis of /sup 60/Ni from 1 to 450 keV

Photoneutron cross sections for Ni isotopes: Toward understanding (n,γ) cross sections relevant to weak s -process nucleosynthesis

Interactions of slow neutrons with the chromium isotopes

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