On the 12C Hoyle state gamma decay. (October 2020)

• Record Type: Journal Article
• Authors: 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.; Marín-Lámbarri, D.J.; Lanzalone, G.; Maiolino, C.; Nannini, A.; Pagano, A.; Pagano, E.V.; Papa, M.; Pirrone, S.; Politi, G.; Pollacco, E.; Quattrocchi, L.; Rizzo, F.; Russo, A. D.; Russotto, P.; Santonocito, D.; Sicari, V.; Trifirò, A.; Trimarchi, M.
• Is Part Of: Journal of physics. Volume 1668(2020)
• Publication Date: 2020-10
• Subjects: Hoyle state -- gamma decay -- redundant kinematics; Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1668/1/012004
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: The γ-decays of 12 C 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 γ-decay probabilities. The measurement was performed at INFN-LNS in Catania using the 4 π CHIMERA multidetector. In order to measure these low probability decay-channels we performed 4-fold coincidence measurements. The 12 C target nuclei were excited by using a beam of 64 MeV α-particles produced by the Superconducting Cyclotron (CS) of INFN-LNS. The scattered α-particles and the 12 C recoils were detected and identified by? E-E and ToF methods using CHIMERA telescopes. The two emitted γ-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-α 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.