Double-neutron capture reaction and natural abundance of 183W, 195Pt and 199Hg isotopes

21st International School on Nuclear Physics and Applications & International Symposium on Exotic Nuclei

Karamian, S.A.^1 ; Aksenov, N.V.^1 ; Bozhikov, G.A.^1

Joint Institute for Nuclear Research, Moscow Region, Dubna

141980, Russia^1

关键词: Activation method;    Capture cross sections;    double capture;    Isotope abundance;    Neutron capture reaction;    Neutron cross sections;    Neutron-capture process;    radioactive products;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/724/1/012022/pdf
DOI  :  10.1088/1742-6596/724/1/012022

来源: IOP

【 摘 要 】

There are much data on neutron cross sections over the chart of nuclides for stable isotopes and not as much for the radioactive ones. Double neutron capture experiments could be fruitful to provide more data. Time-integrated mean flux of slow neutrons reaches the value of 2.3-1012n/cm2s at the irradiation port near the active zone of the IBR-2 pulsed reactor of JINR. This is enough to detect the double neutron capture products by the activation method. A high capture cross section is obtained in the present experiment for intermediate radioactive182Ta and194Ir target nuclides. Together with the known data for198Au, these values may prove an essential role of double neutron capture process for nucleosynthesis of183W,195Pt and199Hg isotopes at stellar conditions.