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Characteristics of the copolymerized CR-39-DAP track detector for the observation of ultra heavy nuclei in galactic cosmic rays
https://repo.qst.go.jp/records/62716
https://repo.qst.go.jp/records/6271633788e94-d900-4a28-924f-d9222ee415b7
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2008-09-16 | |||||
| タイトル | ||||||
| タイトル | Characteristics of the copolymerized CR-39-DAP track detector for the observation of ultra heavy nuclei in galactic cosmic rays | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Kodaira, Satoshi
× Kodaira, Satoshi× 小平 聡 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Precise measurement of chemical composition of ultra heavy nuclei (Z>30) in galactic cosmic rays (GCRs) would make a breakthrough to resolve the remaining problems in cosmic ray astrophysics. Although the elemental composition of such GCRs has been observed by previous experiments, but its abundance has not been sufficiently resolved. Moreover, thoes isotopes have not been observed yet. It is because of the extremely low flux in GCRs and the difficulty of mass identification of such massive particles. High performance cosmic ray detectors with an excellent mass resolution and a high collecting power are required to observe precisely such massive isotopic compositions in GCRs. For this purpose, a novel detector to detect selectively ultra heavy nuclei was developed. The response and detection threshold for heavy ions with various Z/b were investigated by developing new copolymers mixing CR-39 (BARYOTRAK) with various concentrated DAP (diallyl phthalate). CR-39 (BARYOTRAK) has many advantages: 1) high uniformity of detector response, 2) the very nice surface quality after the etching, and 3) the excellent charge and mass resolutions for heavy ions. It is found o control the Z/b detection threshold of copolymers by changing DAP concentration. This novel detector with the excellent particle identification power and variable Z/b detection threshold is adequate to detect ultra heavy nuclei. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 24th International Conference on Nuclear Tracks in Solids | |||||
| 発表年月日 | ||||||
| 日付 | 2008-09-05 | |||||
| 日付タイプ | Issued | |||||
