Observation of Double Radiative Capture on Pionic Hydrogen

S. Tripathi; D. S. Armstrong; M. E. Christy; J. H.D. Clark; T. P. Gorringe; M. D. Hasinoff; M. A. Kovash; D. H. Wright; P. A. Żołnierczuk

doi:10.1103/PhysRevLett.89.252501

Observation of Double Radiative Capture on Pionic Hydrogen

S. Tripathi, D. S. Armstrong, M. E. Christy, J. H.D. Clark, T. P. Gorringe, M. D. Hasinoff, M. A. Kovash, D. H. Wright, P. A. Żołnierczuk

Physics And Astronomy

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4 Scopus citations

Abstract

We report the first observation of double radiative capture on pionic hydrogen. The experiment was conducted at the TRIUMF cyclotron using the RMC spectrometer and detected [Formula presented]-ray coincidences following [Formula presented] stops in liquid hydrogen. We found the branching ratio for double radiative capture to be [Formula presented]. The measured branching ratio and angle-energy distributions support the theoretical prediction of a dominant contribution from the [Formula presented] annihilation mechanism.

Original language	English
Journal	Physical Review Letters
Volume	89
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.89.252501
State	Published - 2002

Bibliographical note

Funding Information:
We wish to thank the staff of the TRIUMF laboratory for their support of this work. In particular, we acknowledge the help of Renée Poutissou on the data acquisition and Dennis Healey on the hydrogen target. In addition, we thank Douglas Beder and Harold Fearing for helpful discussions and the National Science Foundation (United States), the Natural Sciences and Engineering Research Council (Canada), the Henry Luce Foundation (JHDC), and the Jeffress Memorial Trust (DSA) for financial ?>support.

ASJC Scopus subject areas

Physics and Astronomy (all)

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10.1103/PhysRevLett.89.252501

Cite this

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title = "Observation of Double Radiative Capture on Pionic Hydrogen",

abstract = "We report the first observation of double radiative capture on pionic hydrogen. The experiment was conducted at the TRIUMF cyclotron using the RMC spectrometer and detected [Formula presented]-ray coincidences following [Formula presented] stops in liquid hydrogen. We found the branching ratio for double radiative capture to be [Formula presented]. The measured branching ratio and angle-energy distributions support the theoretical prediction of a dominant contribution from the [Formula presented] annihilation mechanism.",

author = "S. Tripathi and Armstrong, {D. S.} and Christy, {M. E.} and Clark, {J. H.D.} and Gorringe, {T. P.} and Hasinoff, {M. D.} and Kovash, {M. A.} and Wright, {D. H.} and {\.Z}o{\l}nierczuk, {P. A.}",

note = "Funding Information: We wish to thank the staff of the TRIUMF laboratory for their support of this work. In particular, we acknowledge the help of Ren{\'e}e Poutissou on the data acquisition and Dennis Healey on the hydrogen target. In addition, we thank Douglas Beder and Harold Fearing for helpful discussions and the National Science Foundation (United States), the Natural Sciences and Engineering Research Council (Canada), the Henry Luce Foundation (JHDC), and the Jeffress Memorial Trust (DSA) for financial ?>support.",

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doi = "10.1103/PhysRevLett.89.252501",

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AU - Tripathi, S.

AU - Armstrong, D. S.

AU - Christy, M. E.

AU - Clark, J. H.D.

AU - Gorringe, T. P.

AU - Hasinoff, M. D.

AU - Kovash, M. A.

AU - Wright, D. H.

AU - Żołnierczuk, P. A.

N1 - Funding Information: We wish to thank the staff of the TRIUMF laboratory for their support of this work. In particular, we acknowledge the help of Renée Poutissou on the data acquisition and Dennis Healey on the hydrogen target. In addition, we thank Douglas Beder and Harold Fearing for helpful discussions and the National Science Foundation (United States), the Natural Sciences and Engineering Research Council (Canada), the Henry Luce Foundation (JHDC), and the Jeffress Memorial Trust (DSA) for financial ?>support.

PY - 2002

Y1 - 2002

N2 - We report the first observation of double radiative capture on pionic hydrogen. The experiment was conducted at the TRIUMF cyclotron using the RMC spectrometer and detected [Formula presented]-ray coincidences following [Formula presented] stops in liquid hydrogen. We found the branching ratio for double radiative capture to be [Formula presented]. The measured branching ratio and angle-energy distributions support the theoretical prediction of a dominant contribution from the [Formula presented] annihilation mechanism.

AB - We report the first observation of double radiative capture on pionic hydrogen. The experiment was conducted at the TRIUMF cyclotron using the RMC spectrometer and detected [Formula presented]-ray coincidences following [Formula presented] stops in liquid hydrogen. We found the branching ratio for double radiative capture to be [Formula presented]. The measured branching ratio and angle-energy distributions support the theoretical prediction of a dominant contribution from the [Formula presented] annihilation mechanism.

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Observation of Double Radiative Capture on Pionic Hydrogen

Abstract

Bibliographical note

ASJC Scopus subject areas

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