Direct measurement of the hyperfine structure of the ground state positronium using high power sub-THz radiation

T. Yamazaki; A. Miyazaki; T. Suehara; T. Namba; S. Asai; T. Kobayashi; H. Saito; Y. Tatematsu; I. Ogawa; T. Idehara

doi:10.1109/IRMMW-THz.2012.6380416

Direct measurement of the hyperfine structure of the ground state positronium using high power sub-THz radiation

T. Yamazaki, A. Miyazaki, T. Suehara, T. Namba, S. Asai, T. Kobayashi, H. Saito, Y. Tatematsu, I. Ogawa, T. Idehara

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

We plan to directly measure the hyperfine structure of the ground-state positronium. The hyperfine structure between ortho-positronium and para-positronium is about 203 GHz. We develop a new optical system to accumulate about 10 kW power using a gyrotron and a Fabry-Pérot cavity, and have already observed the hyperfine transition at a frequency point of 202.9 GHz. The transition probability is measured to be A = 3.1_-1.2 ^+1.6×10^-8 s^-1, which is in good agreement with the theoretical value of 3.37×10^-8 s^-1. In order to measure the hyperfine structure, we have to repeat transition measurements at different frequencies around 203 GHz. We are now refining the optical system to quickly change output frequency and obtain more power.

Original language	English
Title of host publication	IRMMW-THz 2012 - 37th International Conference on Infrared, Millimeter, and Terahertz Waves
DOIs	https://doi.org/10.1109/IRMMW-THz.2012.6380416
Publication status	Published - 2012
Externally published	Yes
Event	37th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2012 - Wollongong, NSW, Australia Duration: Sept 23 2012 → Sept 28 2012

Publication series

Name	International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
ISSN (Print)	2162-2027
ISSN (Electronic)	2162-2035

Other

Other	37th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2012
Country/Territory	Australia
City	Wollongong, NSW
Period	9/23/12 → 9/28/12

All Science Journal Classification (ASJC) codes

Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1109/IRMMW-THz.2012.6380416

Cite this

Yamazaki, T., Miyazaki, A., Suehara, T., Namba, T., Asai, S., Kobayashi, T., Saito, H., Tatematsu, Y., Ogawa, I., & Idehara, T. (2012). Direct measurement of the hyperfine structure of the ground state positronium using high power sub-THz radiation. In IRMMW-THz 2012 - 37th International Conference on Infrared, Millimeter, and Terahertz Waves Article 6380416 (International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz). https://doi.org/10.1109/IRMMW-THz.2012.6380416

Direct measurement of the hyperfine structure of the ground state positronium using high power sub-THz radiation. / Yamazaki, T.; Miyazaki, A.; Suehara, T. et al.
IRMMW-THz 2012 - 37th International Conference on Infrared, Millimeter, and Terahertz Waves. 2012. 6380416 (International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Yamazaki, T, Miyazaki, A, Suehara, T, Namba, T, Asai, S, Kobayashi, T, Saito, H, Tatematsu, Y, Ogawa, I & Idehara, T 2012, Direct measurement of the hyperfine structure of the ground state positronium using high power sub-THz radiation. in IRMMW-THz 2012 - 37th International Conference on Infrared, Millimeter, and Terahertz Waves., 6380416, International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz, 37th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2012, Wollongong, NSW, Australia, 9/23/12. https://doi.org/10.1109/IRMMW-THz.2012.6380416

Yamazaki T, Miyazaki A, Suehara T, Namba T, Asai S, Kobayashi T et al. Direct measurement of the hyperfine structure of the ground state positronium using high power sub-THz radiation. In IRMMW-THz 2012 - 37th International Conference on Infrared, Millimeter, and Terahertz Waves. 2012. 6380416. (International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz). doi: 10.1109/IRMMW-THz.2012.6380416

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title = "Direct measurement of the hyperfine structure of the ground state positronium using high power sub-THz radiation",

abstract = "We plan to directly measure the hyperfine structure of the ground-state positronium. The hyperfine structure between ortho-positronium and para-positronium is about 203 GHz. We develop a new optical system to accumulate about 10 kW power using a gyrotron and a Fabry-P{\'e}rot cavity, and have already observed the hyperfine transition at a frequency point of 202.9 GHz. The transition probability is measured to be A = 3.1-1.2 +1.6×10-8 s-1, which is in good agreement with the theoretical value of 3.37×10-8 s-1. In order to measure the hyperfine structure, we have to repeat transition measurements at different frequencies around 203 GHz. We are now refining the optical system to quickly change output frequency and obtain more power.",

author = "T. Yamazaki and A. Miyazaki and T. Suehara and T. Namba and S. Asai and T. Kobayashi and H. Saito and Y. Tatematsu and I. Ogawa and T. Idehara",

year = "2012",

doi = "10.1109/IRMMW-THz.2012.6380416",

language = "English",

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T1 - Direct measurement of the hyperfine structure of the ground state positronium using high power sub-THz radiation

AU - Yamazaki, T.

AU - Miyazaki, A.

AU - Suehara, T.

AU - Namba, T.

AU - Asai, S.

AU - Kobayashi, T.

AU - Saito, H.

AU - Tatematsu, Y.

AU - Ogawa, I.

AU - Idehara, T.

PY - 2012

Y1 - 2012

N2 - We plan to directly measure the hyperfine structure of the ground-state positronium. The hyperfine structure between ortho-positronium and para-positronium is about 203 GHz. We develop a new optical system to accumulate about 10 kW power using a gyrotron and a Fabry-Pérot cavity, and have already observed the hyperfine transition at a frequency point of 202.9 GHz. The transition probability is measured to be A = 3.1-1.2 +1.6×10-8 s-1, which is in good agreement with the theoretical value of 3.37×10-8 s-1. In order to measure the hyperfine structure, we have to repeat transition measurements at different frequencies around 203 GHz. We are now refining the optical system to quickly change output frequency and obtain more power.

AB - We plan to directly measure the hyperfine structure of the ground-state positronium. The hyperfine structure between ortho-positronium and para-positronium is about 203 GHz. We develop a new optical system to accumulate about 10 kW power using a gyrotron and a Fabry-Pérot cavity, and have already observed the hyperfine transition at a frequency point of 202.9 GHz. The transition probability is measured to be A = 3.1-1.2 +1.6×10-8 s-1, which is in good agreement with the theoretical value of 3.37×10-8 s-1. In order to measure the hyperfine structure, we have to repeat transition measurements at different frequencies around 203 GHz. We are now refining the optical system to quickly change output frequency and obtain more power.

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U2 - 10.1109/IRMMW-THz.2012.6380416

DO - 10.1109/IRMMW-THz.2012.6380416

M3 - Conference contribution

AN - SCOPUS:84873450850

SN - 9781467315975

T3 - International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz

BT - IRMMW-THz 2012 - 37th International Conference on Infrared, Millimeter, and Terahertz Waves

T2 - 37th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2012

Y2 - 23 September 2012 through 28 September 2012

ER -

Direct measurement of the hyperfine structure of the ground state positronium using high power sub-THz radiation

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