Isospin effects in a covariant transport approach to spallation reactions: Analysis of p+Fe and p+Pb reactions at 0.8,1.2, and 1.6 GeV

Journal Article · Fri Jan 15 00:00:00 EST 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.014605· OSTI ID:21386550

Abdel-Waged, Khaled ^[1]; Felemban, Nuha ^[1]; Gaitanos, Theodoros ^[2]; Ferini, Graziella; Toro, Massimo Di ^[3]

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1. Umm Al-Qura University, Faculty of Applied Science, Physics Department, Makkah, Post Office Box 10471 (Saudi Arabia)
2. Institut fur Theortische Physik, Universitat Giessen, D-35392 Giessen (Germany)
3. Laboratori Nazionali del Sud INFN, Physics and Astronomy Department, University of Catania, I-95123 Catania (Italy)

We have investigated the influence of different nonlinear relativistic mean-field models (NL, NL{rho}, and NL{rho}{delta}) on spallation neutrons for p+Fe and p+Pb reactions at 0.8,1.2, and 1.6 GeV by means of a relativistic Boltzmann Uehling Uhlenbeck (RBUU) approach plus a statistical multifragmentation (SM) decay model. We find that the 'evaporation shoulder', that is, the neutron energy spectrum from 3 to 30 MeV, almost for any emission angle is quite sensitive to the isospin part of the mean field. For the more neutron-rich Pb target the evaporation component can be directly related to the low-density behavior on the symmetry energy in the thermal expansion phase of the excited compound system. It turns out that the spallation data for the reactions under study are shown to be more consistent with RBUU+SM employing the NLrho effective Lagrangian.

• OSTI ID: 21386550
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 81, Issue 1; Other Information: DOI: 10.1103/PhysRevC.81.014605; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DENSITY
EMISSION
ENERGY SPECTRA
GEV RANGE 01-10
ION-ATOM COLLISIONS
IRON
ISOSPIN
LAGRANGIAN FUNCTION
LEAD
MEAN-FIELD THEORY
MEV RANGE 10-100
NEUTRON-RICH ISOTOPES
NEUTRONS
PROTONS
RELATIVISTIC RANGE
SPALLATION
SYMMETRY
THERMAL EXPANSION
ATOM COLLISIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
COLLISIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
EXPANSION
FERMIONS
FUNCTIONS
GEV RANGE
HADRONS
ION COLLISIONS
ISOTOPES
METALS
MEV RANGE
NUCLEAR REACTIONS
NUCLEONS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
RADIOISOTOPES
SPECTRA
TRANSITION ELEMENTS