Journal
NUCLEAR PHYSICS A
Volume 804, Issue -, Pages 151-161Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysa.2008.02.003
Keywords
hypernuclei; non-mesonic weak decay; proton spectra
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Funding
- National Research Foundation of Korea [R01-2005-000-10050-0, R01-2007-000-11714-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The results of a measurement of the proton spectra following the non-mesonic weak decay of He-5(Lambda), Li-7(Lambda) and C-12(Lambda) are presented and discussed. The experiment was performed at the (e(+) e(-)) collider DA Phi NE at Laboratori Nazionale di Frascati of INFN. It is the first measurement for Li-7(Lambda), and for all the spectra the lower limit on the energy of the protons is 15 MeV, never reached before. All the spectra show a similar shape, namely a peak at around 80 MeV as expected for the free Lambda p -> np weak reaction, with a low energy rise that should be due to final state interactions and/or two-nucleon induced weak processes. The decay spectrum of He-5(Lambda) is somehow similar to the ones reported by previous measurements and theoretical calculations, but the same does not happen for the C-12(Lambda) one.
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