{"created":"2023-07-27T04:46:31.359612+00:00","id":47047,"links":{},"metadata":{"_buckets":{"deposit":"96e1d4d8-dc49-456b-b4ad-eef646e1c2e6"},"_deposit":{"created_by":3,"id":"47047","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"47047"},"status":"published"},"_oai":{"id":"oai:tohoku.repo.nii.ac.jp:00047047","sets":["76:267"]},"author_link":["110776","110775","110780","110777","110779","110781","110778"],"item_4_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1994-09-16","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicPageEnd":"209","bibliographicPageStart":"203","bibliographicVolumeNumber":"40","bibliographic_titles":[{"bibliographic_title":"Science reports of the Research Institutes, Tohoku University. Ser. A, Physics, chemistry and metallurgy"}]}]},"item_4_date_62":{"attribute_name":"登録日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2008-05-02","subitem_date_issued_type":"Created"}]},"item_4_date_63":{"attribute_name":"公開日（投稿完了日）","attribute_value_mlt":[{"subitem_date_issued_datetime":"2008-05-02","subitem_date_issued_type":"Created"}]},"item_4_date_65":{"attribute_name":"発行日","attribute_value_mlt":[{"subitem_date_issued_datetime":"1994-09-16","subitem_date_issued_type":"Created"}]},"item_4_date_80":{"attribute_name":"更新日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2010-01-27","subitem_date_issued_type":"Created"}]},"item_4_description_15":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_4_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"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.","subitem_description_type":"Abstract"}]},"item_4_description_41":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"subitem_description":"紀要類(bulletin)","subitem_description_type":"Other"}]},"item_4_description_66":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"784417 bytes","subitem_description_type":"Other"}]},"item_4_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.50974/00043610","subitem_identifier_reg_type":"JaLC"}]},"item_4_publisher_34":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"Tohoku University"}]},"item_4_radio_69":{"attribute_name":"公開範囲","attribute_value_mlt":[{"subitem_radio_item":"学外"}]},"item_4_source_id_7":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"00408808","subitem_source_identifier_type":"ISSN"}]},"item_4_source_id_9":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AA00836167","subitem_source_identifier_type":"NCID"}]},"item_4_version_type_16":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"HASEGAWA, Masayuki"}],"nameIdentifiers":[{"nameIdentifier":"110775","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"TABATA, Makoto"}],"nameIdentifiers":[{"nameIdentifier":"110776","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"MIYAMOTO, Tetsushi"}],"nameIdentifiers":[{"nameIdentifier":"110777","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"FUJINAMI, Masanori"}],"nameIdentifiers":[{"nameIdentifier":"110778","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"SUNAGA, Hiromi"}],"nameIdentifiers":[{"nameIdentifier":"110779","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"OKADA, Sohei"}],"nameIdentifiers":[{"nameIdentifier":"110780","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"YAMAGUCHI, Sadae"}],"nameIdentifiers":[{"nameIdentifier":"110781","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-02-16"}],"displaytype":"detail","filename":"KJ00004200599.pdf","filesize":[{"value":"784.4 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"KJ00004200599.pdf","url":"https://tohoku.repo.nii.ac.jp/record/47047/files/KJ00004200599.pdf"},"version_id":"291680a1-8bd3-4e5a-8ccb-b4e3abcd6b49"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Positron Annihilation","subitem_subject_scheme":"Other"},{"subitem_subject":"Positronium","subitem_subject_scheme":"Other"},{"subitem_subject":"Silica Glass","subitem_subject_scheme":"Other"},{"subitem_subject":"Irradiation Effects","subitem_subject_scheme":"Other"},{"subitem_subject":"Voids","subitem_subject_scheme":"Other"},{"subitem_subject":"Defects","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Positron Annihilation in Neutron- and Electron-Irradiated Silica Glass","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Positron Annihilation in Neutron- and Electron-Irradiated Silica Glass"}]},"item_type_id":"4","owner":"3","path":["267"],"pubdate":{"attribute_name":"公開日","attribute_value":"2008-05-02"},"publish_date":"2008-05-02","publish_status":"0","recid":"47047","relation_version_is_last":true,"title":["Positron Annihilation in Neutron- and Electron-Irradiated Silica Glass"],"weko_creator_id":"3","weko_shared_id":3},"updated":"2023-07-27T13:33:43.165617+00:00"}