| Autor: |
Agnello, M., Benussi, L., Bertani, M., Bhang, H. C., Bonomi, G., Botta, E., Bregant, M., Bressani, T., Bufalino, S., Busso, L., Calvo, D., Camerini, P., Dalena, B., De Mori, F., D'Erasmo, G., Fabbri, F. L., Feliciello, A., Filippi, A., Fiore, E. M., Fontana, A. |
| Předmět: |
|
| Zdroj: |
EPJ Web of Conferences; 2012, Issue 37, p01023-p.1-01023-p.7, 7p |
| Abstrakt: |
The FINUDA experiment at DAΦNE, Frascati, has found evidence for the neutron-rich hypernucleus Λ6H studying (π+, π-) pairs in coincidence from the Kstop- + 6Li → Λ6H + π+ production reaction followed by Λ6H → 6He + π- weak decay. The production rate of Λ6H undergoing this two-body π- decay has been found to be (2.9 ± 2.0) ⋅ 10-6/Kstop-. Its binding energy has been evaluated to be BΛ(Λ6H) = (4.0 ± 1.1) MeV with respect to 5H + Λ, jointly from production and decay. A systematic difference of (0.98 ± 0.74) MeV between BΛ values derived separately from decay and from production has been tentatively assigned to the Λ6H 0g.s.+ → 1+ excitation. A similar investigation has been carried out for the neutron-rich hypernucleus Λ9He studying the Kstop- + 9Be → Λ9He + π+ reaction in coincidence with the Λ9He → 9Li + π- weak decay; an upper limit for the production rate of Λ9He undergoing the two-body π- decay has been found to be 4.2 ⋅ 10-6/Kstop- (90% C.L.). [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
