| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
In this research, we focused on 204Tl-204Pb which is known as "s-process thermometer" in order to investigate the temperature inside the star in the early universe. In order to function as an astronomical thermometer, the precise and accurate measurement of neutron capture cross section for daughter nucleus 204 Pb is required. In order to obtain the very small neutron capture cross section of 204 Pb with the energy (8 keV) corresponding to the star's temperature in the early universe, we newly developed the LaBr detector system at J-PARC, which can obtain high intensity pulse neutron. We have succeeded in measuring TOF and energy of the prompt gamma rays emitted from the neutron capture reaction and observing the several resonances by the neutron capture reaction in the keV neutron energy region.
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