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

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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
Externally published	Yes

Funding

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.

Funders	Funder number
DSA
JHDC
National Science Foundation
Henry Luce Foundation
Thomas F. and Kate Miller Jeffress Memorial Trust
Luonnontieteiden ja Tekniikan Tutkimuksen Toimikunta

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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.}",

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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.

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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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JO - Physical Review Letters

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Observation of Double Radiative Capture on Pionic Hydrogen

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