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International Workshop on multifragmentation and Related Topics - IWM 2011, Caen : France (2011)
Direct evidence of α-particle condensation for the Hoyle state
Ad.R. Raduta1, B. Borderie1, E. Geraci, N. Le Neindre1, 2, P. Napolitani1, M.F. Rivet1
ISOSPIN Collaboration(s)

The fragmentation of quasi-projectiles from the nuclear reaction 40Ca+12C at 25 MeV/nucleon was used to produce excited states candidates to α-particle condensation. Complete kinematic characterization of individual decay events, made possible by the CHIMERA high-granularity 4π charged particle multi-detector, reveals that 7.5±4.0 % of the Hoyle state particle decays correspond to direct decays in three equal-energy α-particles. Moreover, events with increased kinetic energy dispersion in the 12C center of mass, which amount to 9.5±4.0 %, point toward the occurrence of a second competing molecular configuration, of a linear α-chain.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
Physique/Physique Nucléaire Expérimentale