Probing preformed {alpha} particles in the ground state of nuclei

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.031301· OSTI ID:21419501

Scarpaci, J A; Fallot, M; Assie, M; Lefevre, L; Frascaria, N; Beaumel, D; Bhar, C; Blumenfeld, Y; Desesquelles, P; Idbarkach, H; Khan, E; Plagnol, E; Roynette, J C; Shrivastava, A; Zerguerras, T ^[1]; Lacroix, D; Chbihi, A; Chomaz, Ph; Frankland, J; Laville, J L ^[2]

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1. Institut de Physique Nucleaire, Centre National de la Recherche Scientifique/Institut National de Physique Nucleaire et de Physique des Particules (CNRS/IN2P3), Universite Paris-Sud 11, F-91406 Orsay (France)
2. Grand Accelerateur National d'Ions Lourds (GANIL), Commissariat a l'Energie Atomique et aux Energies Alternatives/Direction des Sciences de la Matiere (CEA/DSM)-CNRS/IN2P3, Bd Henri Becquerel, Boite Postale 55027, F-14076 Caen Cedex 5 (France)

In this Rapid Communication, we report on {alpha}-particle emission through the nuclear breakup in the reaction {sup 40}Ca on a {sup 40}Ca target at 50 A MeV. It is observed that, similar to nucleons, {alpha} particles can be emitted to the continuum with very specific angular distribution during the reaction. The {alpha}-particle properties seem to be compatible with an {alpha} cluster in the daughter nucleus that is perturbed and is emitted by the short-range nuclear attraction of the collision partner. A time-dependent theory that describes the {alpha}-particle wave-function evolution is able to qualitatively reproduce the observed angular distribution. This mechanism offers new possibilities for studying {alpha}-particle properties in the nuclear medium.

• OSTI ID: 21419501
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 82, Issue 3; Other Information: DOI: 10.1103/PhysRevC.82.031301; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ANGULAR DISTRIBUTION
CALCIUM 40
CALCIUM 40 TARGET
COLLISIONS
EMISSION
GROUND STATES
MEV RANGE 10-100
NUCLEAR REACTIONS
NUCLEONS
TIME DEPENDENCE
WAVE FUNCTIONS
ALKALINE EARTH ISOTOPES
BARYONS
CALCIUM ISOTOPES
CHARGED PARTICLES
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
FERMIONS
FUNCTIONS
HADRONS
IONIZING RADIATIONS
ISOTOPES
LIGHT NUCLEI
MEV RANGE
NUCLEI
RADIATIONS
STABLE ISOTOPES
TARGETS