We present a compilation and evaluation of experimental β-delayed neutron emission probabilities (Pn) and half-lives (T1/2) for known or potential β-delayed neutron precursors with atomic number Z > ...28 (73Cu–233Fr). This article includes the recommended values of both of these quantities, together with a compilation of experimental measurements when available. Some notable cases, as well as proposed standards for β-delayed neutron measurements are also discussed. Evaluated data has also been compared to systematics using three different approaches. The literature cut-off date for this work is August 15, 2020.
Nuclear Data Sheets for A = 72 Abriola, D.; Sonzogni, A.A.
Nuclear data sheets,
2010, 2010-1-00, 2010-01-01, Letnik:
111, Številka:
1
Journal Article
Recenzirano
Experimental data on ground- and excited-state properties for all known nuclei with mass number A = 72 have been compiled and evaluated. States populated in radioactive decay, as well as in nuclear ...reactions, have been considered. For these nuclei, level and decay schemes, as well as tables of nuclear properties, are given. This work supersedes the 1994 evaluation by W.-T. Chow and M.M. King (1994Ch45).
We present an evaluation and compilation of β-delayed neutron probabilities and half-lives for nuclei in the region Z = 2–28 (8He–80Ni). This article includes the recommended values of these ...quantities as well as a compiled list of experimental measurements for each nucleus in the region for which β-delayed neutron emission is possible. The literature cut-off for this work is August 15th, 2015. Some notable cases as well as new standards for β-delayed neutron measurements in this mass region are also discussed.
In the analysis of elastic-scattering experimental data, optical-model parameters (usually, depths of real and imaginary potentials) are fitted and conclusions are drawn analyzing their variations at ...bombardment energies close to the Coulomb barrier (threshold anomaly). The judgement about the shape of this variation (related to the physical processes producing this anomaly) depends on these fitted values but the robustness of the conclusions strongly depends on the uncertainties with which these parameters are derived. We will show that previous published studies have not used a common criteriumfor the evaluation of the parameter uncertainties. In this work, a study of these uncertainties is presented, using conventional statistic tools as well as bootstrapping techniques. As case studies, these procedures are applied to re-analyze detailed elastic-scattering data for the 12C + 208Pb and the 6Li + 80Se systems.
Ion Beam Analysis (IBA) is a set of material characterization techniques using energetic ion beams. IBA provides information about composition and the depth profile of elements in the near-surface ...layers of a sample, from the energy spectra of backscattered primary particles, recoils, nuclear reaction products or emitted γ-radiation. All IBA methods presuppose knowledge of the differential cross-section data however, only for strict Rutherford scattering is the cross-section known exactly. In order to address the data needs of the IBA community, the IAEA initiated the Coordinated Research Project (CRP) “Development of a Reference Database for Ion Beam Analysis” in 2005 which will conclude in 2010. The project focuses on the measurement, assessment, evaluation and benchmarking of elastic scattering and reaction cross sections. Data measured in this work have been incorporated in the IBANDL database (
http://www-nds.iaea.org/ibandl/), whereas the evaluated cross-sections (calculated from the fit to the data of a nuclear model) are made available to the community through the on-line calculator SigmaCalc (
http://www-nds.iaea.org/sigmacalc/).
A summary of the results of the CRP activity is presented, and ways to further develop nuclear data for IBA are indicated. In particular, a newly proposed CRP devoted to particle induced gamma-ray emission is described.
The 10Be/9Be ratios in marine sediments samples from the Southern Chile Trench have been measured using accelerator mass spectrometry (AMS). The samples were measured at the TANDAR accelerator, where ...the discrimination of the 10Be radionuclides was achieved by means of a passive absorber in front of an ionization chamber. This setup along with the high voltage available, provided a complete suppression of the 10B isobar interference. The obtained values for the 10Be concentrations, of the order of 109atoms/g, are the first 10Be measurements from the Southern Chile Trench and offer an excellent tracer to quantitatively study the recycling of sediments in Andean magmas.
The evolution of Information Technology has made it possible to provide the Nuclear Data community with various flexible tools customized to respond to individual data queries, to provide ...visualization, and facilitate dissemination. In another effort to further these developments, the IAEA's Nuclear Data Section has developed a set of applications based on a relational database designed for nuclear structure and decay data. The tools presented in this work mainly use the nuclear structure and decay data obtained from ENSDF and the Nuclear Wallet cards. The present set of applications comprises an interactive Chart of Nuclides (LiveChart) not only presenting the Chart graphically, but also allowing the visualization of data patterns while changing filtering criteria, a web-based query application and a desktop version of the relational database giving support to expert users to customize their data-processing applications. Some examples of the three software tools are presented. KCI Citation Count: 2
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