| Title: | The high precision observation of ultra heavy cosmic ray nuclei |
| Subject: | Direct detection of primary cosmic rays |
| Presenter: | HASEBE, Nobuyuki |
| Abstract: | The high precision observation program of ultra heavy cosmic ray nuclei is proposed as the new approach of long duration balloon and space station experiments to measure nuclear composition of galactic cosmic rays with high mass resolution. It consists of two kinds of large telescopes, a Large Heavy Isotope Telescope Array (LHITA) and a Large Area Heavy Particle Spectrometer (LAHPS) which are made of solid-state track detectors, BP-1 and CR-39. They focus on the precise measurement of elemental and isotopic abundance of ultra-heavy particles in cosmic ray source region, which covers a wide range of scientific themes including studies to understand the origin, the mechanism of heating and initial acceleration of charged particles, and to investigate the nucleosynthesis of ultra-heavy nuclei by s-, r- and p-process and the chemical evolution of galactic matter. In order to pursue these objectives, three observations are planned in space station and long duration balloon experiments in southern hemisphere for relativistic ultra-heavy cosmic rays (Z £ 82) and up to actinides by LAHPS, respectively. LHITA onboard Antarctic balloon will observe an elemental and isotopic composition Fe~Ba in the energy range from 100 MeV/n to 800 MeV/n. We will also search for the existence of trans-uranium atoms in relativistic cosmic rays. These telescopes have an unprecedented collection power about 10 times larger than the previous ones. |
Last modified: Mon Feb 12 17:13:16 WET 2007