Spallation of gold by 100 --300 MeV pions

Journal Article · Sat Dec 01 04:00:00 EST 1979 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.20.2293· OSTI ID:5841886

Kaufman, S B; Steinberg, E P; Butler, G W

Cross sections of radioactive products resulting from the interactions of 100-, 180-, and 300-MeV ..pi../sup +/ and ..pi../sup -/ mesons with gold have been determined by analysis of the ..gamma..-ray spectra of bombarded target foils. More than 30 nuclides were identified between mass numbers 167 and 196. The results indicate the following. (1) The most probable charge for a given mass lies several charge units to the neutron-poor side of the beta-stability line. (2) The average cross-section ratios sigma (..pi../sup -/)/sigma (..pi../sup +/) for all measured nuclides are 1.34, 1.23, and 1.05 at 100, 180, and 300 MeV, respectively. At a given energy there is no systematic variation of the ratio with nuclide mass number. These results are what is expected from Coulomb effects, with no indication of an isospin effect due to the large T/sub Z/ of the target. (3) The influence of the (3,3) resonance is apparent in the total reaction cross section. (4) The average excitation energy transferred to the nucleus is similar for ..pi../sup +/ and ..pi../sup -/ induced reactions and increases with increasing pion kinetic energy. Comparisons of the data with intranuclear cascade-evaporation calculations indicate that the latter predict less pion absorption than actually occurs.

• Research Organization: Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 5841886
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 20:6; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651925* -- Nuclear Properties & Reactions
A=190-219
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BETA DECAY
CHARGED-PARTICLE REACTIONS
COULOMB FIELD
CROSS SECTIONS
DECAY
ELECTRIC FIELDS
ENERGY
ENERGY RANGE
EVAPORATION MODEL
GAMMA SPECTRA
GOLD 197 TARGET
HADRON REACTIONS
ISOSPIN
KINETIC ENERGY
MASS SPECTRA
MATHEMATICAL MODELS
MESON REACTIONS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR CASCADES
NUCLEAR MODELS
NUCLEAR REACTIONS
PARTICLE PROPERTIES
PION MINUS REACTIONS
PION PLUS REACTIONS
PION REACTIONS
SPALLATION
SPECTRA
TARGETS
TOTAL CROSS SECTIONS