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Measurement of the proton spectra from non-mesonic weak decay of ΛHe, ΛLi and ΛC |
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| Institution: | aDipartimento di Fisica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, Italy bINFN Sezione di Torino, via P. Giuria 1, Torino, Italy cDepartment of Physics, St. Petersburg State University, St. Petersburg, Russia dUniversity of Victoria, Finnerty Rd.,Victoria, Canada eLaboratori Nazionali di Frascati dell'INFN, via E. Fermi 40, Frascati, Italy fDepartment of Physics, Seoul National University, 151-742 Seoul, South Korea gDipartimento di Meccanica, Università di Brescia, via Valotti 9, Brescia, Italy hINFN Sezione di Pavia, via Bassi 6, Pavia, Italy iDipartimento di Fisica Sperimentale, Università di Torino, via P. Giuria, 1 Torino, Italy jDipartimento di Fisica Università di Trieste, via Valerio 2, Trieste, Italy kINFN Sezione di Trieste, via Valerio 2, Trieste, Italy lDipartimento di Fisica Generale, Università di Torino, via P. Giuria 1, Torino, Italy mENEA C.R. Frascati, via E. Fermi 45, Frascati, Italy nDipartimento InterAteneo di Fisica, via Amendola 173, Bari, Italy oINFN Sezione di Bari, via Amendola 173, Bari, Italy pDepartment of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan qJINR, Dubna, Moscow region, Russia rDepartment of Physics, Shahid Behesty University, 19834 Teheran, Iran sDipartimento di Fisica Teorica e Nucleare, Universita' di Pavia, via Bassi 6, Pavia, Italy tINAF-IFSI Sezione di Torino, C.so Fiume 4, Torino, Italy uDepartment of Physics, Sakyo-ku, Kyoto 606-8502, Japan vRIKEN, Wako, Saitama 351-0198, Japan wHigh Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan |
| Abstract: | The results of a measurement of the proton spectra following the non-mesonic weak decay of 5ΛHe, 7ΛLi and 12ΛC are presented and discussed. The experiment was performed at the (e+ e−) collider DAΦNE at Laboratori Nazionale di Frascati of INFN. It is the first measurement for 7ΛLi, 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 Λp→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 5ΛHe is somehow similar to the ones reported by previous measurements and theoretical calculations, but the same does not happen for the 12ΛC one. |
| Keywords: | Hypernuclei Non-mesonic weak decay Proton spectra |
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