Search for α-particle condensation in nuclei from the Hoyle state deexcitation
Heavy ion reactions induced by few tens MeV/nucleon beams constitute an ideal framework for producing and studying nuclear excited states close to the decay threshold. The fragmentation of quasi-projectiles from the nuclear reaction 40Ca+12C at 25 MeV/nucleon performed at LNS-Catania was employed in...
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| Veröffentlicht in: | Journal of physics. Conference series 2013-01, Vol.420 (1), p.12087-7 |
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| creator | Raduta, Ad R Borderie, B Geraci, E Neindre, N Le Napolitani, P Rivet, M F Alba, R Amorini, F Cardella, G Chatterjee, M Filippo, E De Guinet, D Lautesse, P Guidara, E La Lanzalone, G Lanzano, G Lombardo, I Lopez, O Maiolino, C Pagano, A Pirrone, S Politi, G Porto, F Rizzo, F Russotto, P Wieleczko, J P |
| description | Heavy ion reactions induced by few tens MeV/nucleon beams constitute an ideal framework for producing and studying nuclear excited states close to the decay threshold. The fragmentation of quasi-projectiles from the nuclear reaction 40Ca+12C at 25 MeV/nucleon performed at LNS-Catania was employed in order to populate the Hoyle state of 12C and investigate the theoretically predicted molecular structures. 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 particle decays of the Hoyle state correspond to direct decays in three equal-energy α-particles and thus fulfill the decay criteria of an α-particle condensate. 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, a linear α-chain type. Both α-particle condensate and linear chain structures have been theoretically predicted but, to our knowledge, not experimentally confirmed so far. |
| doi_str_mv | 10.1088/1742-6596/420/1/012087 |
| format | Article |
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The fragmentation of quasi-projectiles from the nuclear reaction 40Ca+12C at 25 MeV/nucleon performed at LNS-Catania was employed in order to populate the Hoyle state of 12C and investigate the theoretically predicted molecular structures. 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 particle decays of the Hoyle state correspond to direct decays in three equal-energy α-particles and thus fulfill the decay criteria of an α-particle condensate. 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, a linear α-chain type. Both α-particle condensate and linear chain structures have been theoretically predicted but, to our knowledge, not experimentally confirmed so far.</description><identifier>ISSN: 1742-6588</identifier><identifier>EISSN: 1742-6596</identifier><identifier>DOI: 10.1088/1742-6596/420/1/012087</identifier><language>eng</language><publisher>Bristol: IOP Publishing</publisher><subject>Beams (radiation) ; Calcium isotopes ; Carbon 12 ; Chains ; Charged particles ; Condensates ; Decay ; Dispersions ; Heavy ions ; Ion beams ; Kinetic energy ; Molecular structure ; Nuclear Experiment ; Nuclear reactions ; Nucleons ; Particle decay ; Physics ; Projectiles ; Searching</subject><ispartof>Journal of physics. 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Conference series</title><description>Heavy ion reactions induced by few tens MeV/nucleon beams constitute an ideal framework for producing and studying nuclear excited states close to the decay threshold. The fragmentation of quasi-projectiles from the nuclear reaction 40Ca+12C at 25 MeV/nucleon performed at LNS-Catania was employed in order to populate the Hoyle state of 12C and investigate the theoretically predicted molecular structures. 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 particle decays of the Hoyle state correspond to direct decays in three equal-energy α-particles and thus fulfill the decay criteria of an α-particle condensate. 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, a linear α-chain type. Both α-particle condensate and linear chain structures have been theoretically predicted but, to our knowledge, not experimentally confirmed so far.</description><subject>Beams (radiation)</subject><subject>Calcium isotopes</subject><subject>Carbon 12</subject><subject>Chains</subject><subject>Charged particles</subject><subject>Condensates</subject><subject>Decay</subject><subject>Dispersions</subject><subject>Heavy ions</subject><subject>Ion beams</subject><subject>Kinetic energy</subject><subject>Molecular structure</subject><subject>Nuclear Experiment</subject><subject>Nuclear reactions</subject><subject>Nucleons</subject><subject>Particle decay</subject><subject>Physics</subject><subject>Projectiles</subject><subject>Searching</subject><issn>1742-6588</issn><issn>1742-6596</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNpdkc9Kw0AQxoMoWKuvIAteBImZ_ZfdHEtRKxR6UM_LZrOhW9Js3U3EPpYv4jOZGunBucww82OY-b4kucZwj0HKDAtG0pwXecYIZDgDTECKk2RyHJweaynPk4sYNwB0CDFJVi9WB7NGtQ_o-yvd6dA501hkfFvZNurO-Ra5FrX90HWoDn6LurVFC78fqNjpzqLK2k_jul_2MjmrdRPt1V-eJm-PD6_zRbpcPT3PZ8vUMIAuLRijHAteV5RwSetSci6A0ByzgtjclIbKsiwqakVRA2ggValFXRiZF5xjTqfJ3bh3rRu1C26rw1557dRitlSuJTuqACSwnNEPPNC3I70L_r23sVNbF41tGt1a30eFBZYFYYKSAb35h258H9rhF0W4EBQDEzBQ-UiZ4GMMtj7egEEdXFEHwdVBfDW4orAaXaE_fld9vQ</recordid><startdate>20130101</startdate><enddate>20130101</enddate><creator>Raduta, Ad R</creator><creator>Borderie, B</creator><creator>Geraci, E</creator><creator>Neindre, N Le</creator><creator>Napolitani, P</creator><creator>Rivet, M F</creator><creator>Alba, R</creator><creator>Amorini, F</creator><creator>Cardella, G</creator><creator>Chatterjee, M</creator><creator>Filippo, E De</creator><creator>Guinet, D</creator><creator>Lautesse, P</creator><creator>Guidara, E La</creator><creator>Lanzalone, G</creator><creator>Lanzano, G</creator><creator>Lombardo, I</creator><creator>Lopez, O</creator><creator>Maiolino, C</creator><creator>Pagano, A</creator><creator>Pirrone, S</creator><creator>Politi, G</creator><creator>Porto, F</creator><creator>Rizzo, F</creator><creator>Russotto, P</creator><creator>Wieleczko, J P</creator><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>H8D</scope><scope>HCIFZ</scope><scope>L7M</scope><scope>P5Z</scope><scope>P62</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>7U5</scope><scope>8BQ</scope><scope>JG9</scope><scope>1XC</scope><orcidid>https://orcid.org/0000-0001-5419-6764</orcidid><orcidid>https://orcid.org/0000-0003-0818-4564</orcidid></search><sort><creationdate>20130101</creationdate><title>Search for α-particle condensation in nuclei from the Hoyle state deexcitation</title><author>Raduta, Ad R ; 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| subjects | Beams (radiation) Calcium isotopes Carbon 12 Chains Charged particles Condensates Decay Dispersions Heavy ions Ion beams Kinetic energy Molecular structure Nuclear Experiment Nuclear reactions Nucleons Particle decay Physics Projectiles Searching |
| title | Search for α-particle condensation in nuclei from the Hoyle state deexcitation |
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