Search for an eta-nuclear bound state in the double charge exchange reaction [sup 18]O([pi][sup +],[pi][sup [minus]])[sup 18]Ne(DIAS)

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1992

OSTI ID:7197424

Johnson, J D

Recent calculations have predicted that a bound state between an eta and a nucleus may occur as an intermediate state in pion double charge exchange (DCX). The existence of such a mesic nucleus would lead to a resonance-like structure in the DCX excitation function at fixed momentum transfer. LAMPF Experiment 1140 searched for an [eta]-nucleus bound state in the DCX reaction [sup 18]O([pi][sup +], [pi][sup [minus]])[sup 18]Ne(DIAS). An excitation function for this reaction was measured for energies ranging from 350 to 440 MeV and for momentum transfers of q = 0, 105 and 210 MeV/c. The calculated cross sections agree favorably with previously published data. Theoretical calculations predict that a resonance structure will be evidenced by an enhanced cross section at the eta production threshold for this reaction. The measured excitation function has found some evidence of structure in this region.

• Research Organization: Texas Univ., Austin, TX (United States)
• OSTI ID: 7197424
• Country of Publication: United States
• Language: English

Related Subjects

663200* -- Radioactivity & Electromagnetic Transitions-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BOSONS
BOUND STATE
CHARGE EXCHANGE
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
ETA MESONS
EVEN-EVEN NUCLEI
EXCITATION FUNCTIONS
FUNCTIONS
HADRONS
HEAVY ION REACTIONS
ISOTOPES
LIGHT NUCLEI
MESONS
MEV RANGE
MEV RANGE 100-1000
NEON 18
NEON ISOTOPES
NUCLEAR REACTIONS
NUCLEI
OXYGEN 18 REACTIONS
PIONS
PIONS MINUS
PIONS PLUS
PSEUDOSCALAR MESONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES