Abstract
A new database containing all available experimental and evaluated β-delayed neutron data is presented in this paper. The database is the product of an international effort coordinated by the International Atomic Energy Agency. It comprises a microscopic section including all available experimental data on beta-decay half-lives, β-delayed neutron emission probabilities and spectra, as well as new systematics and global theoretical calculations for comparison. The beta-delayed neutron data for individual precursors have been benchmarked against available data on macroscopic properties such as total delayed-neutron yields and spectra, delayed-neutron decay curves and time-dependent group parameters using the summation method. All available measured macroscopic data have also been compiled in the macroscopic section of the database. The dedicated database is available online on the IAEA server (URL:http://www-nds.iaea.org/beta-delayed-neutron/database.html).
Highlights
Since the first detection of β-delayed neutrons in 1939 there has been significant effort to understand the mechanism of delayed-neutron emission
The scope of the Coordinated Research Project (CRP) included: (i) Compilation and evaluation of experimental half-lives and Pxn for delayed-neutron precursors, (ii) Establishing standards in different mass regions, for which several independent and reliable measurements are available, (iii) Developing new empirical systematics based on the new evaluated Pn data, (iv) Calculating betadecay half-lives and Pn values using available empirical and microscopic models, (v) Testing the new evaluated beta-decay half-lives and Pn values against macroscopic data and benchmark experiments, (vi) Measuring total delayed neutron yields (TDN) and spectra for a range of actinides, (vii) Re-evaluating 6- and 8-group representations based on new measurements, and (viii) Developing systematics for 6- and 8-group representations
The results obtained during the IAEA CRP have been described in detail in the final CRP article submitted to Nuclear Data Sheets [6]
Summary
Since the first detection of β-delayed neutrons in 1939 there has been significant effort to understand the mechanism of delayed-neutron emission. During the last decade there has been a renewed interest in the experimental and theoretical study of β-delayed neutron emission at the generation of radioactive beam facilities mainly focussed on neutronrich nuclei far off the stability line. The results obtained during the IAEA CRP have been described in detail in the final CRP article submitted to Nuclear Data Sheets [6] In this present paper, we discuss selected outputs of the CRP and present the retrieval interface to the new online database (http://www-nds.iaea.org/ beta-delayed-neutron/database.html)
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