We report on the first measurement of the Breit–Wigner resonance of the transition from ortho -positronium to para -positronium. We have developed an optical system to accumulate a power of over 20 kW using a frequency-tunable gyrotron and a Fabry–Pérot cavity. This system opens a new era of millimeter-wave spectroscopy, and enables us to directly determine both the hyperfine interval and the decay width of para -Ps.
{ "_oai": { "updated": "2018-04-19T14:23:21Z", "id": "oai:repo.scoap3.org:8974", "sets": [ "PTEP" ] }, "authors": [ { "raw_name": "Miyazaki, A.", "affiliations": [ { "country": "Japan", "value": "Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan" } ], "surname": "Miyazaki", "given_names": "A.", "full_name": "Miyazaki, A." }, { "raw_name": "Yamazaki, T.", "affiliations": [ { "country": "Japan", "value": "Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan" } ], "surname": "Yamazaki", "given_names": "T.", "full_name": "Yamazaki, T." }, { "raw_name": "Suehara, T.", "affiliations": [ { "country": "Japan", "value": "Department of Physics, Faculty of Science, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan" } ], "surname": "Suehara", "given_names": "T.", "full_name": "Suehara, T." }, { "raw_name": "Namba, T.", "affiliations": [ { "country": "Japan", "value": "Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan" } ], "surname": "Namba", "given_names": "T.", "full_name": "Namba, T." }, { "raw_name": "Asai, S.", "affiliations": [ { "country": "Japan", "value": "Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan" } ], "surname": "Asai", "given_names": "S.", "full_name": "Asai, S." }, { "raw_name": "Kobayashi, T.", "affiliations": [ { "country": "Japan", "value": "Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan" } ], "surname": "Kobayashi", "given_names": "T.", "full_name": "Kobayashi, T." }, { "raw_name": "Saito, H.", "affiliations": [ { "country": "Japan", "value": "Institute of Physics, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan" } ], "surname": "Saito", "given_names": "H.", "full_name": "Saito, H." }, { "raw_name": "Tatematsu, Y.", "affiliations": [ { "country": "Japan", "value": "Research Center for Development of Far-Infrared Region, University of Fukui, 3-9-1 Bunkyo, Fukui-shi, Fukui 910-8507, Japan" } ], "surname": "Tatematsu", "given_names": "Y.", "full_name": "Tatematsu, Y." }, { "raw_name": "Ogawa, I.", "affiliations": [ { "country": "Japan", "value": "Research Center for Development of Far-Infrared Region, University of Fukui, 3-9-1 Bunkyo, Fukui-shi, Fukui 910-8507, Japan" } ], "surname": "Ogawa", "given_names": "I.", "full_name": "Ogawa, I." }, { "raw_name": "Idehara, T.", "affiliations": [ { "country": "Japan", "value": "Research Center for Development of Far-Infrared Region, University of Fukui, 3-9-1 Bunkyo, Fukui-shi, Fukui 910-8507, Japan" } ], "surname": "Idehara", "given_names": "T.", "full_name": "Idehara, T." } ], "titles": [ { "source": "Oxford University Press/Physical Society of Japan", "title": "First millimeter-wave spectroscopy of ground-state positronium" } ], "dois": [ { "value": "10.1093/ptep/ptu181" } ], "publication_info": [ { "journal_title": "Progress of Theoretical and Experimental Physics", "page_start": "011C01", "material": "article", "journal_issue": "1", "year": 2015 } ], "$schema": "http://repo.scoap3.org/schemas/hep.json", "acquisition_source": { "date": "2015-01-28T00:00:00", "source": "Oxford University Press/Physical Society of Japan", "method": "scoap3", "submission_number": "c1e1d35643dc11e890c902163e01809a" }, "page_nr": [ 10 ], "license": [ { "url": "http://creativecommons.org/licenses/by/3.0/", "license": "CC-BY-3.0" } ], "copyright": [ { "statement": "\u00a9 The Author(s) 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"value": "We report on the first measurement of the Breit\u2013Wigner resonance of the transition from ortho -positronium to para -positronium. We have developed an optical system to accumulate a power of over 20\u2009kW using a frequency-tunable gyrotron and a Fabry\u2013P\u00e9rot cavity. This system opens a new era of millimeter-wave spectroscopy, and enables us to directly determine both the hyperfine interval and the decay width of para -Ps." } ], "imprints": [ { "date": "2015-01-28", "publisher": "Oxford University Press/Physical Society of Japan" } ] }