Formation of isobaric nuclides with A = 131 in the interaction of /sup 238/U with 0. 8--11. 5 GeV protons

Journal Article · Mon Oct 01 04:00:00 EDT 1979 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.20.1467· OSTI ID:6036863

Biswas, S; Porile, N T

Cross sections and thick-target recoil properties of /sup 131/Ce, /sup 131/La, /sup 131/Ba, and several neighboring Ba nuclides formed in the interaction of /sup 238/U with 0.8--11.5 GeV protons have been determined. The results reveal a dichotomy between /sup 131/Ba and the more neutron-rich products on the one hand, and the more neutron-deficient ones on the other. The latter have rising excitation functions, forward-to-backward ratios (F/B) that peak at 3 GeV, and ranges that decrease abruptly just below this energy. The former have decreasing excitation functions as well as F/B and ranges that decrease slowly and featurelessly with increasing proton energy. The energy dependence of F/B as well as the changes in the angular distributions of the very neutron deficient products observed between 3 and 11.5 GeV are explained in terms of a change in the nature of near-central proton-nucleus interactions. At the lower energies the interaction consists of a series of nucleon-nucleon collisions while at high energies the proton interacts collectively with all the nucleons lying in its path. The dropoff in the mean ranges of these same nuclides and the accompanying broadening of the spectra indicate a transition between fission and deep spallation. The possible connection between these two effects is discussed. Several experiments to test the proposed model are suggested.

• Research Organization: Department of Chemistry, Purdue University, West Lafayette, Indiana 47907
• OSTI ID: 6036863
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 20:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALKALINE EARTH ISOTOPES
ANGULAR DISTRIBUTION
BARIUM 131
BARIUM ISOTOPES
BARYON REACTIONS
BARYON-BARYON INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CERIUM 131
CERIUM ISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
DISTRIBUTION
ELECTRON CAPTURE RADIOISOTOPES
ENERGY DEPENDENCE
ENERGY RANGE
EVEN-ODD NUCLEI
EXCITATION FUNCTIONS
FISSION
GEV RANGE
GEV RANGE 01-10
GEV RANGE 10-100
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
HALF-LIFE
HOURS LIVING RADIOISOTOPES
INTERACTIONS
INTERMEDIATE MASS NUCLEI
ISOBARIC NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LANTHANUM 131
LANTHANUM ISOTOPES
MEV RANGE
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEON-NUCLEON INTERACTIONS
ODD-EVEN NUCLEI
PARTICLE INTERACTIONS
PROTON REACTIONS
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
RECOILS
SPALLATION
TARGETS
URANIUM 238 TARGET
YIELDS