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, N.S., Acosta, L., Auditore, L., Camaiani, A., De Filippo, E., De Luca, S., Gelli, N., Geraci, E., Gnoffo, B., Guazzoni, C., Marin-Lambarri, D.J., Lanzalone, G., Maiolino, C., Nannini, A., Pagano, A., Pagano, E.V., Papa, M., Pirrone, S., et al.. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - ELETTRONICO. - 1668:(2020), pp. 0-0. (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.
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