Recent theoretical progress in hypernuclear decay

Journal Article · Tue Jul 11 04:00:00 EDT 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2220288· OSTI ID:20873333

Alberico, W M; Garbarino, G ^[1]; Parreno, A; Ramos, A ^[2]

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1. Dipartimento di Fisica Teorica, Universita di Torino, Sezione di Torino, I-10125 Turin (Italy)
2. Departament d'Estructura i Constituents de la Materia, Universitat de Barcelona, E-08028 Barcelona (Spain)

Some progress experienced recently in the field of hypernuclear weak decay is briefly summarized. Theoretical analyses of the double-coincidence nucleon spectra measured at KEK points towards a solution of the long-standing puzzle on the ratio {gamma}n/{gamma}p between the neutron-({lambda}n {yields} nn) and proton-induced ({lambda}p {yields} np) decay rates. Despite this improvement, the reaction mechanism for the hypernuclear non-mesonic weak decay seems to be not fully understood. Indeed, an intriguing problem, of more recent origin, is open: it concerns the asymmetry of the angular emission of non-mesonic weak decay protons from polarized hypernuclei. The important role played by final state interactions and two-nucleon induced decay channels, {lambda}NN {yields} nNN, in the determination of {lambda}n/{lambda}p and the decay asymmetries is pointed out.

• OSTI ID: 20873333
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 842; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
ENERGY SPECTRA
FINAL-STATE INTERACTIONS
HADRONIC PARTICLE DECAY
HYPERNUCLEI
ION EMISSION
JAPANESE ORGANIZATIONS
LAMBDA BARYONS
NEUTRONS
NUCLEAR REACTION KINETICS
PROTONS
WEAK HADRONIC DECAY