Anomalous Bumpy Structures in the Capture Cross Sections of Antiprotons by Helium

Journal Article · Fri Oct 17 00:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.101.163201· OSTI ID:21179815

Tong, X M ^[1]; Hino, K ^[1]; Toshima, N ^[1]

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1. Doctoral Program in Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 (Japan)

We investigate the state-specified capture process of antiprotons by helium. Freezing one of the two electrons, we reduce this four-body rearrangement problem into a three-body problem. The capture cross sections are calculated by solving the Chew-Goldberger-type integral equation. Differing from the capture of antiprotons by hydrogen atoms, the bumpy structures are revealed in the total angular momentum dependent capture cross sections. Further analysis shows that the bumps arise from the partial channel closing due to the removal of the energy degeneracy in the antiprotonic helium.

• OSTI ID: 21179815
• Journal Information: Physical Review Letters, Vol. 101, Issue 16; Other Information: DOI: 10.1103/PhysRevLett.101.163201; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
ANTIPROTONS
CAPTURE
CROSS SECTIONS
ELECTRONS
FOUR-BODY PROBLEM
HELIUM
HYDROGEN
INTEGRAL EQUATIONS
THREE-BODY PROBLEM