2015 Fiscal Year Final Research Report
s-process thermometer and neutron capture cross section of 204Pb
Project/Area Number |
25800162
|
Research Category |
Grant-in-Aid for Young Scientists (B)
|
Allocation Type | Multi-year Fund |
Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
|
Research Institution | Japan Atomic Energy Agency |
Principal Investigator |
segawa mariko 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力基礎工学研究センター, 研究員 (00435603)
|
Research Collaborator |
MAKII Hiroyuki
TOH Yosuke
NAGAI Yasuki
KIMURA Atsushi
|
Project Period (FY) |
2013-04-01 – 2016-03-31
|
Keywords | ガンマ線計測 |
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.
|
Free Research Field |
原子核物理
|