| Journal: | Brazilian journal of physics |
| Database: | PERIÓDICA |
| System number: | 000408593 |
| ISSN: | 0103-9733 |
| Authors: | Barbero, César1 Krmpotic, Francisco2 Galeao, Alfredo P3 |
| Institutions: | 1Universidad Nacional de La Plata, Facultad de Ciencias Exactas, La Plata, Buenos Aires. Argentina 2Universidade de Sao Paulo, Instituto de Fisica, Sao Paulo. Brasil 3Universidade Estadual Paulista "Julio de Mesquita Filho", Instituto de Fisica Teorica, Sao Paulo. Brasil |
| Year: | 2006 |
| Season: | Dic |
| Volumen: | 36 |
| Number: | 4B |
| Pages: | 1357-1362 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, analítico |
| English abstract | We present general explicit expressions for a shell-model calculation of the vector hypernuclear parameter in nonmesonic weak decay. We use a widely accepted effective coupling Hamiltonian involving the exchange of the complete pseudoscalar and vector meson octets (π, η, K, ρ, ω, K∗). In contrast to the approximated formula widely used in the literature, we correctly treat the contribution of transitions originated from single-proton states beyond the s-shell. Exact and simple analytical expressions are obtained for the particular cases of 5 ΛHe and 12 ΛC, within the one-pion-exchange model. Numerical computations of the asymmetry parameter, aΛ, are presented. Our results show a qualitative agreement with other theoretical estimates but also a contradiction with recent experimental determinations. Our simple analytical formulas provide a guide in searching the origin of such discrepancies, and they will be useful for helping to solve the hypernuclear weak decay puzzle |
| Disciplines: | Física y astronomía |
| Keyword: | Física, Física nuclear, Hipernúcleos, Decaimiento radioactivo |
| Keyword: | Physics and astronomy, Nuclear physics, Physics, Hypernuclei, Radioactive decay |
| Full text: | Texto completo (Ver PDF) |
