M. Caponero

First results on 12ΛC production at DAΦNE

Lambda-hypernuclei are produced and studied, with the FINUDA spectrometer, for the first time at an e+e- collider: DAPHNE, the Frascati phi-factory. The slow negative kaons from phi(1020) decay are stopped in thin (0.2 g/cm^2) nuclear targets, and Lambda-hypernuclei formation is detected by measuring the momentum of the outgoing pi^-. A preliminary analysis on 12Lambda-C shows an energy resolution of 1.29 MeV FWHM on the hypernuclear levels, the best obtained so far with magnetic spectrometers at hadron facilities. Capture rates for the ground state and the excited ones are reported, and compared with previous experiments.

Correlated Lambda d pairs from the K(stop)(-)A ->Lambda d A ' reaction

Correlated Lambda d pairs emitted after the absorption of negative kaons at rest K-stop(-) A -> Lambda dA in light nuclei Li-6 and C-12 stop C are studied. A-hyperons and deuterons are found to be preferentially emitted in opposite directions. The Lambda d invariant mass spectrum of Li-6 shows a bump whose mass is3251 +/- 6 MeV/c(2). The bump mass (binding energy), width and yield are reported. The appearance of a bump is discussed in the realm of the [K3N] clustering process in nuclei. The experiment was performed with the FINUDA spectrometer at DA Phi DNE (LNF)

Measurement of the proton spectra from non-mesonic weak decay of 5ΛHe, 7ΛLi and 12ΛC

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 Λ p → n p 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.

Correlated Λd pairs from the Kstop−A→ΛdA′ reaction

Correlated Lambda d pairs emitted after the absorption of negative kaons at rest K-stop(-) A -> Lambda dA in light nuclei Li-6 and C-12 stop C are studied. A-hyperons and deuterons are found to be preferentially emitted in opposite directions. The Lambda d invariant mass spectrum of Li-6 shows a bump whose mass is3251 +/- 6 MeV/c(2). The bump mass (binding energy), width and yield are reported. The appearance of a bump is discussed in the realm of the [K3N] clustering process in nuclei. The experiment was performed with the FINUDA spectrometer at DA Phi DNE (LNF)

Correlated Lambda d pairs from the K-(stop) A ---> Lambda d A-prime reaction

Correlated Lambda d pairs emitted after the absorption of negative kaons at rest K-stop(-) A -> Lambda dA in light nuclei Li-6 and C-12 stop C are studied. A-hyperons and deuterons are found to be preferentially emitted in opposite directions. The Lambda d invariant mass spectrum of Li-6 shows a bump whose mass is3251 +/- 6 MeV/c(2). The bump mass (binding energy), width and yield are reported. The appearance of a bump is discussed in the realm of the [K3N] clustering process in nuclei. The experiment was performed with the FINUDA spectrometer at DA Phi DNE (LNF)

Correlated Λd pairs from the K stop − A → Λ d A ′ reaction

Correlated Lambda d pairs emitted after the absorption of negative kaons at rest K-stop(-) A -> Lambda dA in light nuclei Li-6 and C-12 stop C are studied. A-hyperons and deuterons are found to be preferentially emitted in opposite directions. The Lambda d invariant mass spectrum of Li-6 shows a bump whose mass is3251 +/- 6 MeV/c(2). The bump mass (binding energy), width and yield are reported. The appearance of a bump is discussed in the realm of the [K3N] clustering process in nuclei. The experiment was performed with the FINUDA spectrometer at DA Phi DNE (LNF)

The A(Kstop−, Λd)A′ reaction, a tool to observe [\overline K NNN] clusters

This work presents experimental results obtained from a study of the K stop − A → ΛdA′ reaction, where A = 6Li. The study concerns the distributions of the Λd invariant mass, which allows us to determine the structure of bound [K − ppn] systems in nuclei. A candidate of such clusters is identified in the present measurement, and its mass (binding energy), decay width and yield are reported. The experiment was performed at the DAΦNE o-facility (LNF) by using the FINUDA spectrometer. The study depended on the capability of FINUDA to reconstruct the traces of all the particles involved in the decay of the nuclear cluster.

A study of Λ 7 Li production with FINUDA

The FINUDA experiment studies the production and decay of Λ-hypernuclei by stopping in thin targets the K −s coming from the decay of the Φ (1020) meson at the DAΦNE e + − e − collider at INFN Laboratori Nazionali di Frascati. In this paper we report the results concerning the production of Λ 7 Li. The absolute production rates for bound states and the best up-to-date hypernuclear spectrum obtained by means of the production π − spectroscopy, with an energy resolution of 1.1 MeV (FWHM), are unveiled.

Search for (6)(Lambda)H and (7)(Lambda)H with the (K(stop)(-), pi(+)) reaction

The production of neutron rich

A Study of the proton spectra following the capture of K- in Li-6 and C-12 with FINUDA

Lambda