Anomalies in the decay rates of antiprotonic helium-atom states

Six resonance transitions of the antiprotonic helium atom in helium gas at densities of 3*10/sup 20/-3*10/sup 21/ cm/sup -3/ were studied at the antiproton decelerator (AD) of CERN. The decay rates of the daughter states of these transitions were determined either from the time distributions of the...

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Autores principales: Yamaguchi, H, Ishikawa, T, Sakaguchi, J, Widmann, E, Eades, John, Hayano, R S, Hori, Masaki, Torii, H A, Juhász, B, Horváth, D, Yamazaki, T
Lenguaje:eng
Publicado: 2002
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevA.66.022504
http://cds.cern.ch/record/597169
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author Yamaguchi, H
Ishikawa, T
Sakaguchi, J
Widmann, E
Eades, John
Hayano, R S
Hori, Masaki
Torii, H A
Juhász, B
Horváth, D
Yamazaki, T
author_facet Yamaguchi, H
Ishikawa, T
Sakaguchi, J
Widmann, E
Eades, John
Hayano, R S
Hori, Masaki
Torii, H A
Juhász, B
Horváth, D
Yamazaki, T
author_sort Yamaguchi, H
collection CERN
description Six resonance transitions of the antiprotonic helium atom in helium gas at densities of 3*10/sup 20/-3*10/sup 21/ cm/sup -3/ were studied at the antiproton decelerator (AD) of CERN. The decay rates of the daughter states of these transitions were determined either from the time distributions of the resonance spikes or from the widths of the resonance lines. Whereas most of the observed decay rates agree with theoretical calculations of Auger rates, two states, (n, l)=(37,33) and (32,31), were found to have decay rates two orders of magnitude larger than predicted by these calculations. The effect of coupling with near-lying electron-excited states is considered to be the reason for the anomaly of the (37, 33) state, as pointed out by Kartavtsev et al. Phys. Rev. A 61, 062507 (2000) (25 refs).
id cern-597169
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2002
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spelling cern-5971692019-09-30T06:29:59Zdoi:10.1103/PhysRevA.66.022504http://cds.cern.ch/record/597169engYamaguchi, HIshikawa, TSakaguchi, JWidmann, EEades, JohnHayano, R SHori, MasakiTorii, H AJuhász, BHorváth, DYamazaki, TAnomalies in the decay rates of antiprotonic helium-atom statesOther Fields of PhysicsSix resonance transitions of the antiprotonic helium atom in helium gas at densities of 3*10/sup 20/-3*10/sup 21/ cm/sup -3/ were studied at the antiproton decelerator (AD) of CERN. The decay rates of the daughter states of these transitions were determined either from the time distributions of the resonance spikes or from the widths of the resonance lines. Whereas most of the observed decay rates agree with theoretical calculations of Auger rates, two states, (n, l)=(37,33) and (32,31), were found to have decay rates two orders of magnitude larger than predicted by these calculations. The effect of coupling with near-lying electron-excited states is considered to be the reason for the anomaly of the (37, 33) state, as pointed out by Kartavtsev et al. Phys. Rev. A 61, 062507 (2000) (25 refs).oai:cds.cern.ch:5971692002
spellingShingle Other Fields of Physics
Yamaguchi, H
Ishikawa, T
Sakaguchi, J
Widmann, E
Eades, John
Hayano, R S
Hori, Masaki
Torii, H A
Juhász, B
Horváth, D
Yamazaki, T
Anomalies in the decay rates of antiprotonic helium-atom states
title Anomalies in the decay rates of antiprotonic helium-atom states
title_full Anomalies in the decay rates of antiprotonic helium-atom states
title_fullStr Anomalies in the decay rates of antiprotonic helium-atom states
title_full_unstemmed Anomalies in the decay rates of antiprotonic helium-atom states
title_short Anomalies in the decay rates of antiprotonic helium-atom states
title_sort anomalies in the decay rates of antiprotonic helium-atom states
topic Other Fields of Physics
url https://dx.doi.org/10.1103/PhysRevA.66.022504
http://cds.cern.ch/record/597169
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