Potential experimental evidence of an Efimov state in C-12 and its influence on astrophysical carbon creation
Por:
Cardella, Giuseppe, Bonasera, Aldo, Nunzia, Martorana, Simona, Acosta, Luis, De Filippo, Enrico, Geraci, Elena, Gnoffo, Brunilde, Guazzoni, Chiara, Maiolino, Concettina, Pagano, Angelo, Emanuele, Pagano, Vincenzo, Papa, Massimo, Pirrone, Sara, Politi, Giuseppe, Risitano, Fabio, Rizzo, Francesca, Russotto, Paolo, Trimarchi, Marina
Publicada:
1 ene 2023
Resumen:
We describe the search of the Efimov state in C-12 performed by
analysing a large set of 3-alpha particles coincidence data measured at
the LNS laboratories with the CHIMERA detector. The data are compatible
with the presence of an Efimov state at the excitation energy of 7.485
MeV, with an excitation probability smaller than 0.3% of the population
probability of the Hoyle state. The Efimov state gamma decay probability
should be around 30%, much larger than the one of the Hoyle state. The
population of this level is compatible with the Suda limit for the
3-alpha reaction rate in stars because its population should be possible
only through direct 3-alpha reaction. More investigations improving the
detector angular resolution are needed to confirm these preliminary
observations.
Filiaciones:
Cardella, Giuseppe:
INFN, Sezione Catania, Catania, Italy
Bonasera, Aldo:
INFN, Lab Nazl Sud, Catania, Italy
Texas AM Univ, Cyclotron Inst, College Stn, TX USA
Martorana, Simona:
INFN, Lab Nazl Sud, Catania, Italy
Univ Catania, Dip Fis & Astr Ettore Majorana, Catania, Italy
Acosta, Luis:
Politecn Milan, DEIB, Milan, Italy
INFN, Sez Milano, Milan, Italy
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, Mexico
De Filippo, Enrico:
INFN, Sezione Catania, Catania, Italy
Geraci, Elena:
INFN, Sezione Catania, Catania, Italy
Univ Catania, Dip Fis & Astr Ettore Majorana, Catania, Italy
Gnoffo, Brunilde:
INFN, Sezione Catania, Catania, Italy
Univ Catania, Dip Fis & Astr Ettore Majorana, Catania, Italy
Guazzoni, Chiara:
Politecn Milan, DEIB, Milan, Italy
Maiolino, Concettina:
INFN, Lab Nazl Sud, Catania, Italy
Pagano, Angelo:
INFN, Sezione Catania, Catania, Italy
Pagano, Vincenzo:
INFN, Lab Nazl Sud, Catania, Italy
Papa, Massimo:
INFN, Sezione Catania, Catania, Italy
Pirrone, Sara:
INFN, Sezione Catania, Catania, Italy
Politi, Giuseppe:
INFN, Sezione Catania, Catania, Italy
Risitano, Fabio:
INFN, Sezione Catania, Catania, Italy
Univ Messina, DSMISFT, Messina, Italy
Rizzo, Francesca:
INFN, Lab Nazl Sud, Catania, Italy
Univ Catania, Dip Fis & Astr Ettore Majorana, Catania, Italy
Russotto, Paolo:
INFN, Lab Nazl Sud, Catania, Italy
Trimarchi, Marina:
INFN, Sezione Catania, Catania, Italy
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