Pontecorvo reactions in antiproton annihilation on deuterium

Journal Article · Wed May 10 04:00:00 EDT 1995 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.48231· OSTI ID:165640

Armstrong, D S ^[1]

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1. College of William and Mary, Williamsburg, Virginia 2318 (United States)

Pontecorvo reactions are antiproton annihilations on nuclei in which the final states are of a type not attainable from annihilations on free nucleons, for example {bar p}d{r_arrow}Xn, where X is a single meson. We report on the first observations of Pontecorvo reactions with a recoiling neutron, from {bar p} annihilation at rest in liquid deuterium. The results are B.R.({bar p}d{r_arrow}{pi}{sup 0}n)=(6.63{plus_minus}0.59){times}10{sup {minus}6}, B.R.({bar p}d{r_arrow}{eta}n)=(2.99{plus_minus}0.42){times}10{sup {minus}6}, B.R.({bar p}d{r_arrow}{omega}n)=(21.2{times}3.5){times}10{sup {minus}6}, and B.R.({bar p}d{r_arrow}{eta}{prime}n) {le}12{times}10{sup {minus}6} (at 90% C.L.). The result for {bar p}d{r_arrow}{pi}{sup 0}n is compatible with the only previously observed Pontecorvo reaction {bar p}d{r_arrow}{pi}{sup {minus}}p, assuming charge independence. The ratios of these branching ratios are compared to predictions based on dynamical models of the annihilation process which reproduce the general features of the data. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• Sponsoring Organization: USDOE
• OSTI ID: 165640
• Report Number(s): CONF-9405132--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 334; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANNIHILATION
ANTIPROTON-DEUTERON INTERACTIONS
BRANCHING RATIO
EXPERIMENTAL DATA
MEV RANGE 100-1000