| Item type |
紀要論文 / Departmental Bulletin Paper(1) |
| 公開日 |
2008-05-02 |
| タイトル |
|
|
タイトル |
Positron Annihilation in Neutron- and Electron-Irradiated Silica Glass |
| 言語 |
|
|
言語 |
eng |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Positron Annihilation |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Positronium |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Silica Glass |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Irradiation Effects |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Voids |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Defects |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
departmental bulletin paper |
| ID登録 |
|
|
ID登録 |
10.50974/00043610 |
|
ID登録タイプ |
JaLC |
| 著者 |
HASEGAWA, Masayuki
TABATA, Makoto
MIYAMOTO, Tetsushi
FUJINAMI, Masanori
SUNAGA, Hiromi
OKADA, Sohei
YAMAGUCHI, Sadae
|
| 抄録 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
Positron lifetime and angular correlation of annihilation radiation (ACAR) have been measured on fused and synthetic silica glass before and after irradiation with fast-neutrons up to 8x10^<18> n/cm^2 below 150℃ or with 3 MeV electrons up to 1x10^<18>e/cm^2 below 50℃. Before irradiation positron lifetime spectra show characteristic long-lifetimes due to ortho-positronium (o-Ps) formation and are well decomposed into 3 components with the time constants τ_i (i=1, 2, 3) and the relative intensities I_i (I_1+I_2+I_3=1). The τ_3 lifetime is about 1.7 ns, being nearly independent of the samples, while τ_2 is strongly dependent on the samples, ranging from 0.7 to 1.2 ns. Narrow peaks on the ACAR curves and the τ_3 lifetime give evidence of Ps formation in structural open-spaces (voids) with radius about 0.3nm. By neutron-irradiation the τ_2 lifetime has reduced to about 0.47 ns irrespective to the samples but its intensity (I_2) has increased with the dose. This component suggests positron trapping without Ps formation at irradiation-induced defects such as peroxy radicals. Annealing behavior of lifetime parameters is also presented and compared with previous ESR work. |
| 書誌情報 |
Science reports of the Research Institutes, Tohoku University. Ser. A, Physics, chemistry and metallurgy
巻 40,
号 1,
p. 203-209,
発行日 1994-09-16
|
| ISSN |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
00408808 |
| 書誌レコードID |
|
|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA00836167 |
| フォーマット |
|
|
内容記述タイプ |
Other |
|
内容記述 |
application/pdf |
| 著者版フラグ |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| 出版者 |
|
|
出版者 |
Tohoku University |
| 資源タイプ |
|
|
内容記述タイプ |
Other |
|
内容記述 |
紀要類(bulletin) |
| 登録日 |
|
|
日付 |
2008-05-02 |
|
日付タイプ |
Created |
| 公開日（投稿完了日） |
|
|
日付 |
2008-05-02 |
|
日付タイプ |
Created |
| 発行日 |
|
|
日付 |
1994-09-16 |
|
日付タイプ |
Created |
| フォーマット |
|
|
内容記述タイプ |
Other |
|
内容記述 |
784417 bytes |
| 更新日 |
|
|
日付 |
2010-01-27 |
|
日付タイプ |
Created |
KJ00004200599.pdf (784.4 kB)
