Isotope effects on antiproton and muon capture by hydrogen and deuterium atoms and molecules

Journal Article · Mon Feb 01 04:00:00 EST 1999 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.59.1160· OSTI ID:304241

Cohen, J S ^[1]

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1. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

Cross sections for capture of the antiproton ({bar p}) and negative muon ({mu}{sup {minus}}) by the H{sub 2} and D{sub 2} molecules are calculated using fermion molecular dynamics (FMD). All the cross sections are significantly larger than those for capture by the corresponding atom, also evaluated by the FMD method. The largest molecular cross sections are obtained when the negative projectile mass best matches the nuclear mass in the molecular target, thus for {bar p}+H{sub 2}. The vibrational degree of freedom is shown to be most important in distinguishing the four reactions, but the effects of rotations, two-center electronic charge distribution, and nonadiabaticity are also significant. The predicted {ital initial} capture fractions (i.e., not taking subsequent transfer into account) in a H{sub 2}+D{sub 2} mixture are P{sub capt}{sup (p)}/P{sub capt}{sup (d)}=qc{sub p}/c{sub d}, where q=1.585 for {bar p} and q=1.186 for {mu}{sup {minus}} independent of c{sub p} and c{sub d}. The energy-dependent quantum-number distributions of the exotic atoms formed, the angular distributions of antiprotonic atoms, and the initial kinetic energies of muonic atoms are also presented. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 304241
• Journal Information: Physical Review A, Journal Name: Physical Review A Journal Issue: 2 Vol. 59; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANGULAR DISTRIBUTION
ANTIPROTONS
CAPTURE
CROSS SECTIONS
DEUTERIUM
DEUTERIUM COMPOUNDS
HADRONIC ATOMS
HYDROGEN COMPOUNDS
ISOTOPE EFFECTS
MOLECULAR DYNAMICS METHOD
MUON-ATOM COLLISIONS
MUONIC ATOMS
MUONIC MOLECULES
MUONS