This paper presents the results of a study on pion-helium interaction channels with two charged secondaries at 106 MeV by means of a visualizing technique based on a Self-Shunted Streamer Chamber (SSSC). Following previous studies at several energies, the present work is intended to cover the lack of data for energies below the Delta(1232) threshold in 4 He, and to reveal new phenomenology far from the A activation. Relative branching ratios for different channels are given; as well as new evidence for single charge exchange reaction and for clustering effects between neutron and He-3 in the neutron knockout reaction. First evidence for the existence of a single-gamma emission channel is presented. Comparison of the differential cross-sections, deduced from the elastic and single-gamma emission events, with the elastic cross-sections obtained in previous measurements is performed. The energy distributions of the emitted single gammas are also presented; fits with Planck's radiation distribution give good chi(2) revealing possible nucleus' black-body-like behaviour.The black-body temperature for He-4 nucleus in the aforementioned conditions is extracted.

pi(+/- 4)-He interactions at 218 MeV/c

FROLOV, VLADIMIR;BALESTRA, Ferruccio;BUSSO, Luigi;BUSSA, Maria Pia;CHIOSSO, Michela;FERRERO, Livio;GNESI, IVAN;GRASSO, Antonino;MAGGIORA, MARCO;PIRAGINO, Guido;ZOSI, Gianfranco;FAVA, Luciano;
2006

Abstract

This paper presents the results of a study on pion-helium interaction channels with two charged secondaries at 106 MeV by means of a visualizing technique based on a Self-Shunted Streamer Chamber (SSSC). Following previous studies at several energies, the present work is intended to cover the lack of data for energies below the Delta(1232) threshold in 4 He, and to reveal new phenomenology far from the A activation. Relative branching ratios for different channels are given; as well as new evidence for single charge exchange reaction and for clustering effects between neutron and He-3 in the neutron knockout reaction. First evidence for the existence of a single-gamma emission channel is presented. Comparison of the differential cross-sections, deduced from the elastic and single-gamma emission events, with the elastic cross-sections obtained in previous measurements is performed. The energy distributions of the emitted single gammas are also presented; fits with Planck's radiation distribution give good chi(2) revealing possible nucleus' black-body-like behaviour.The black-body temperature for He-4 nucleus in the aforementioned conditions is extracted.
121
771
780
SCATTERING ENERGIES; CHAMBER; HELIUM; PIONS; HE-4; PI
Angelov NS; Baginyan SA; Batusov YA; Belolaptikov IA; Blokhintseva TD; Bonyushkina AY; Butenko VA; Dem'yanov AA; Drozdov VA; Frolov VN; Grebenyuk VJ; Ivanov VV; Kirilov AS; Kovalenko VE; Lyashenko VI; Moiseenko AS; Panyushkin VA; Pontecorvo G; Pryanichnikov VI; Rozhdestvensky AM; Russakovich NA; Smirnova IY; Balestra F; Busso L; Bussa MP; Chiosso M; Colantoni ML; Ferrero A; Ferrero L; Garfagnini R; Gnesi I; Grasso A; Maggiora A; Maggiora M; Piragino G; Zosi GF; Fava L; Panzieri D; Bianconi A; Rizzini EL; Venturelli L; Schepkin MG
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/73943
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