First results from the FINUDA experiment

Nuclear Physics A, 2012

The FINUDA experiment has recently completed an extensive study of the weak decay of p-shell Λhypernuclei including both mesonic and non-mesonic modes. Charged mesonic decay rates have been determined based on the analysis of π − kinetic energy spectra, never measured before. The study of proton spectra from non-mesonic weak decay for p-shell hypernuclei, both single and in coincidence with a neutron, has triggered the investigation of the two-nucleon induced ΛN N → nN N decay channel: its weight has been evaluated to be Γ 2 /Γ NM = 0.21 ± 0.07 stat +0.03 sys −0.02 sys. Finally, a direct experimental evidence of the occurrence of the weak reaction Λnp → nnp in nuclei is presented for the first time. Three events have been found which can be attributed to 7 Λ Li and 9 Λ Be two-nucleon induced non-mesonic weak decay; the kinematical analysis is discussed here.

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1996

FINUDA [ 1,2] is one of the two experiments approved for running in the coming years at DA@NE, the Frascati $factory. Large production of A-hypemuclei, from absorption of K-at rest in nuclear targets, will allow an unprecedented step forward in hypernuclear physics (spectroscopy, mesonic and non-mesonic decay, new hypemuclei with neutron excess). The foreseen momentum resolution for pions of 250-270 MeV/c is nearly 0.3% FWHM over a solid angle larger than 2~, and the foreseen production of hypemuclear states is 75 per hour.

1999

This paper briefly reviews the present status of strange nuclearphysics. Recently, significant progress has been made. Oneexample to be discussed is a new, electroproduction experimentwhich offers the possibility of obtaining hypernuclearspectra with at least a factor of 3 better resolution thanpreviously. However, many different experiments impact a spectrumof problems from weak interactions to astrophysics. Although inthis short paper it is not possible to cover many topics in depth,sufficient information is provided so that the interested readercan obtain all of the most relevant material.

Nuclear Physics A, 1995

The DA~NE project at the Laboratori Nazionali di Frascati (LNF) is an e+ecollider with electron and positron beams accelerated to 510 MeV by a Linae injector. DA(I)NE is designed to reach a top luminosity /2,,~ lOaacm-2s -1, that is, to produce ~4x103 (I)(1020)s -1. The hypernuclear research program at DA(I)NE relies on lowenergy kaons, ,,, 16MeV, being produced by C-meson decays at rest: (I) --+ K-K + with a B.R.,,~49%. In the initial stage, DA~NE will operate at a £,-~ 10a2cm-2s -1, however the number of • produced, and the large geometrical acceptance of the FINUDA detector, ,,~ 3sr, will allow a strong hypernuelear physics program to be pursued. 0375-9474/951509.50 © 1995 -Elsevier Science B.V. All rights reserved. SSDI 0375-9474(94)00577-X 272c M. Agnello et al. / Nuclear Physics A585 (1995) 271c-278c

Journal of Physics: Conference Series, 2011

Institute for Data Evaluation and Analysis Technical Reports (IDEA-TR), 2017

The present volume contains five papers, published by Tatsuo Tabata and his coworkers from 1959 to 1961, in the form of the post-print re-edited by the use of LATEX. The studies described belong to the field of low-energy experimental nuclear physics, and experiments are of two types. One is nuclear-spectroscopy; and the other, nuclear-reaction study. For the former, a group at Kyoto University (KU) used the Cockcroft–Walton generator of KU and measured proton capture gamma-rays. For the latter, another group, organized at the Institute for Nuclear Study (INS), the University of Tokyo, used alpha particles from the INS cyclotron. Tabata joined these groups as a student of Master’s Program, Graduate School of Science, KU. Each paper includes the “Commentary” section written by the present editor at its end. The editor has also corrected minor errors in the papers.

Nuclear Physics A, 2010

The Non-Mesonic two-body decays 4 Λ He → dd, pt and 5 Λ He → dt have been studied by the FINUDA experiment. The branching ratios for these rare decay channels are given.

The European Physical Journal A, 2007

The FINUDA experiment studies the Λ-hypernuclei formation and decay using the reaction (K − stop , π − ) induced by the low-momentum K − from the deacy of the φ-meson produced at the (e + , e − ) collider DAφNE at the Laboratory Nazionali di Frascati of INFN. In this paper we present new data on the proton spectra following the weak decay of 12 Λ C.

Few-Body Systems, 2011

The FAIR facility, to be constructed at the GSI site in Darmstadt, will be addressing a wealth of outstanding questions within the realm of subatomic, atomic and plasma physics through a combination of novel accelerators, storage rings and innovative experimental set-ups. One of the key installations is the fragment separator Super-FRS that will be able to deliver an unprecedented range of radioactive ion beams (RIBs) in the energy range of 0-1.5 GeV/u to the envisaged experiments collected within the NuSTAR collaboration. This will in particular permit new experimental investigations of nuclear few-body systems at extreme isospins, also reaching beyond the drip-lines, using the NuSTAR-R 3 B set-up. The outcome of pilot experiments on unbound systems are reported, as well as crucial detector upgrades.