The Nubase2012 evaluation of nuclear properties

Abstract

This paper presents the NUBASE2012 evaluation that contains the recommended values for nuclear and decay properties of nuclides in their ground and excited isomeric (T 1/2 ≥100 ns) states. All nuclides for which some experimental information is known are considered. NUBASE2012 covers all up to date experimental data published in primary (journal articles) and secondary (mainly laboratory reports and conference proceedings) references, together with the corresponding bibliographical information. During the development of NUBASE2012, the data available in the "Evaluated Nuclear Structure Data File" (ENSDF) database were consulted, and critically assessed of their validity and completeness. Furthermore, a large amount of new and somewhat older experimental results that were missing in ENSDF were compiled, evaluated and included in NUBASE2012. The atomic mass values were taken from the "Atomic Mass Evaluation" (AME2012, second and third parts of the present issue). In cases where no experimental data were available for a particular nuclide, trends in the behavior of specific properties in neighboring nuclei (TNN) were examined. This approach allowed to estimate, whenever possible, values for a range of properties, and are labeled in NUBASE2012 as "non-experimental" (flagged "#"). Evaluation procedures and policies that were used during the development of this database are presented, together with a detailed table of recommended values and their uncertainties. AMDC: http://amdc.in2p3.fr/ and http://amdc.impcas.ac.cn/ * This work has been undertaken with the encouragement of the IUPAP Commission on Symbols, Units, Nomenclature, Atomic Masses and Fundamental Constants (SUNAMCO).

Delayed neutron emission near the shell-closures

“…(Color online) Beta-decay half-lives and total P n values for the K (potassium) isotopic chain. The experimental data have been obtained from the NUBASE evaluation [14]. The data of Ref.…”

“…At the same time our FRSA calculation [10] including both the tensor interaction and 2p−2h configuration effects shows a very good agreement for 128 Pd. [7,14,19] and halflives based on the FRDM [8], the FRSA model including both the tensor interaction and 2p−2h configuration effects [10], the shell model (SM) [20].…”

New thermonuclear reaction rates of64Ge(p,γ)65As and65As(p,γ)66Se for type-I x-ray bursts

“…Γ p is the proton width for the entrance channel, and Γ γ is the gamma (γ) width for the exit channel, and other decay channels are closed [20] thus the total width Γ tot ≈ Γ p + Γ γ . The proton width is defined as…”

The 2012 Atomic Mass Evaluation and Future

“…The second one presented a table with the recommended values of the atomic masses, as well as tables and graphs of derived quantities, together with a list of all references used [4]. Similarly to the previous distributions [5], the AME2012 is accompanied by the NUBASE2012 evaluation, which provides a consistent interpretation of the individual states involved in the mass evaluation [6]. The main nuclear properties, such as masses, excitation energies of isomers, half-lives, spins and parities, and decay modes, and their intensities, for all known nuclei in their ground and excited isomeric states that have half lives longer than 100 ns, are listed in the NUBASE2012 evaluation.…”