The gamma-decays of C-12 excited levels (the Hoyle state 0(+) at 7.65 MeV and the 9.64 MeV 3(-)) are essential for its production in the universe. We present here a new attempt to precisely measure such gamma-decay probabilities. The measurement was performed at INFN-LNS in Catania using the 4 pi CHIMERA multidetector. In order to measure these low probability decay-channels we performed 4-fold coincidence measurements. The C-12 target nuclei were excited by using a beam of 64 MeV alpha-particles produced by the Superconducting Cyclotron (CS) of INFN-LNS. The scattered alpha-particles and the C-12 recoils were detected and identified by Delta E-E and ToF methods using CHIMERA telescopes. The two emitted gamma -rays in the decay chain were detected and identified by using the second stage of the telescopes, CsI(Tl) scintillators, by means of fast-slow and rise time techniques. Kinematics and energy-momentum conservation laws were used to constrain the data analysis. Also the 3-alpha decay channel probability was measured. Such a simultaneous measurement of all known decay channels was useful to reduce the systematic errors. Preliminary results of the data analysis are reported.

On the C-12 Hoyle state gamma decay / Cardella, G; Favela, F; Martorana, NS; Acosta, L; Auditore, L; Camaiani, A; De Filippo, E; De Luca, S; Gelli, N; Geraci, E; Gnoffo, B; Guazzoni, C; Marin-Lambarri, DJ; Lanzalone, G; Maiolino, C; Nannini, A; Pagano, A; Pagano, EV; Papa, M; Pirrone, S; Politi, G; Pollacco, E; Quattrocchi, L; Rizzo, F; Russo, AD; Russotto, P; Santonocito, D; Sicari, V; Trifiro, A; Trimarchi, M. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - ELETTRONICO. - 1668:(2020), pp. 0-0. (Intervento presentato al convegno Nuclear Physics in Astrophysics IX) [10.1088/1742-6596/1668/1/012004].

On the C-12 Hoyle state gamma decay

Camaiani, A;Nannini, A;Pirrone, S;Politi, G;Quattrocchi, L;Russo, AD;
2020

Abstract

The gamma-decays of C-12 excited levels (the Hoyle state 0(+) at 7.65 MeV and the 9.64 MeV 3(-)) are essential for its production in the universe. We present here a new attempt to precisely measure such gamma-decay probabilities. The measurement was performed at INFN-LNS in Catania using the 4 pi CHIMERA multidetector. In order to measure these low probability decay-channels we performed 4-fold coincidence measurements. The C-12 target nuclei were excited by using a beam of 64 MeV alpha-particles produced by the Superconducting Cyclotron (CS) of INFN-LNS. The scattered alpha-particles and the C-12 recoils were detected and identified by Delta E-E and ToF methods using CHIMERA telescopes. The two emitted gamma -rays in the decay chain were detected and identified by using the second stage of the telescopes, CsI(Tl) scintillators, by means of fast-slow and rise time techniques. Kinematics and energy-momentum conservation laws were used to constrain the data analysis. Also the 3-alpha decay channel probability was measured. Such a simultaneous measurement of all known decay channels was useful to reduce the systematic errors. Preliminary results of the data analysis are reported.
2020
Journal of Physics: Conference Series
Nuclear Physics in Astrophysics IX
Cardella, G; Favela, F; Martorana, NS; Acosta, L; Auditore, L; Camaiani, A; De Filippo, E; De Luca, S; Gelli, N; Geraci, E; Gnoffo, B; Guazzoni, C; Ma...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1330113
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