Ayano Makinaga

Towards a More Complete and Accurate Experimental Nuclear Reaction Data Library (EXFOR). International Collaboration Between Nuclear Reaction Data Centres (NRDC)

The International Network of Nuclear Reaction Data Centres (NRDC) coordinated by the IAEA Nuclear Data Section (NDS) successfully collaborates in the maintenance and development of the EXFOR library. As the scope of published data expands (e.g. to higher energy, to heavier projectile) to meet the needs of research and applications, it has become a challenging task to maintain both the completeness and accuracy of the EXFOR library. Evolution of the library highlighting recent developments is described.

Compilation of Nuclear Reaction Data from RIBF

Nuclear data, e.g. cross sections, half-lives, and decay radiation properties, can be obtained through scientific investigation of nuclear properties and reactions. The results of experimental measurements of different nuclear reaction data are distributed in various publications and hence are difficult for users to access. Therefore, there is a need to compile the data into a database. One of the database is the EXFOR library, which is maintained by the International Network of Nuclear Reaction Data Centres (NRDC) under the auspices of the International Atomic Energy Agency (IAEA). As one of the NRDC members, the Hokkaido University Nuclear Reaction Data Centre (JCPRG) has contributed about 10 percent of the data on charged-particle nuclear reactions in the EXFOR library. JCPRG compiles and accumulates charged-particle data obtained in Japanese facilities in their own database NRDF. The compiled nuclear reaction data is available through the online search system of the NRDF and the EXFOR library. In addition to the collaboration with the NRDC network, JCPRG established a collaborative research contract with the RIKEN Nishina Center in 2010, to increase the availability of the nuclear reaction data produced at the RIBF. The compiled files of the nuclear data produced at the RIBF are translated to the EXFOR format for the benefit of nuclear data users. We have addressed a smooth and high-quality compilation of the RIBF data as one of the important tasks in this collaboration. This write-up provides a brief overview of the JCPRG compilation activity in 2013 regarding experimental nuclear reaction data produced at the RIBF. Among the papers compiled in 2013, thirteen contained RIBF data in the compilation scope of the EXFOR library, out of which eight papers published in 2013 had already been registered on the EXFOR library. Five papers published in 2012 had also been registered on the EXFOR library in 2013. The data can be easily accessed from the EXFOR search system by using the accession numbers given in Table 1. The list of RIBF data compiled into the EXFOR library is also available on the JCPRG website along with additional information. To ensure a high-quality database, we ask authors to provide the original data plotted in each figure so

Cross section measurement on 139La (γ,γ’) below neutron separation energy

The γ‐ray strength function is an important input quantity for the determination of the photoreaction rate and the neutron capture rate for astrophysics as well as for nuclear technologies. Recent studies show that extra γ‐ray strength near the neutron separation energy Sn (pygmy resonance) affects the stellar reaction rate strongly. In this work, the photoabsorption cross section for 139La below Sn was measured using bremsstrahlung produced at the electron accelerator ELBE of Eorschungszentrum Dresden‐Rossendorf with an electron beam of 11.5 MeV kinetic energy. Experimental result of 139La is presented.