Deeply-bound pionic atoms via the (. pi. sup minus , p ) reaction

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.46.1474· OSTI ID:6948299

Kaufmann, W B ^[1]; Siegel, P B ^[2]; Gibbs, W R ^[3]

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1. Arizona State University, Tempe, Arizona 85287 (United States)
2. California State Polytechnic University, Pomona, California 91768 (United States)
3. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States) New Mexico State University, Las Cruces, New Mexico 88003 (United States)

We examine the essentials of the pion capture reaction ({pi}{sup {minus}},{ital p}) with the pion captured directly into an atomic orbit. The reaction is a promising candidate for the population of the 1{ital s} or 2{ital p} atomic levels of medium to heavy nuclei. These levels have never been observed, but rather reliable theoretical calculations indicate that they have relatively small widths. One reason for interest in these levels is that they give a direct measurement of the threshold pion-nucleus amplitude, which has a bearing on questions such as chiral-symmetry breaking in the nuclear medium and the anomalously small level shifts and widths of some of the more deeply-bound pionic atoms. The differential cross section for the process is calculated using the distorted-wave impulse approximation. It is found that for medium-mass nuclei and incident pion beams of 20--50 MeV cross sections of the order of microbarns, well within the capability of present meson factories, can be expected. The related process ({pi}{sup {minus}},{ital n}) is also studied.

• OSTI ID: 6948299
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 46:4; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663460* -- Meson- & Hyperon-induced Reactions & Scattering-- (1992-)
664500 -- Special Atoms & Molecules-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
BARYONS
CAPTURE
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
FEASIBILITY STUDIES
FERMIONS
HADRON REACTIONS
HADRONIC ATOMS
HADRONS
INFORMATION
MESIC ATOMS
MESON REACTIONS
MEV RANGE
MEV RANGE 10-100
NUCLEAR REACTIONS
NUCLEONS
NUMERICAL DATA
P STATES
PION MINUS REACTIONS
PION REACTIONS
PIONIC ATOMS
PROTONS
S STATES
THEORETICAL DATA