Theory of pion induced nucleon removal in the (3,3) resonance region; multinucleon removal reactions in the interaction of I-127 with 60-350 MeV pions
Thesis/Dissertation
·
OSTI ID:5756201
A Benioff-type calculation has been performed to calculate the (..pi../sup + -/,..pi..N) reaction cross sections in the (3,3) resonance region (100-300 MeV) for /sup 12/C, /sup 25/Mg, /sup 127/I, and /sup 197/Au, treating the nucleon charge exchange probability P as an adjustable parameter. For /sup 12/C P has also been estimated using the free particle-free particle picture. Nucleon charge exchange appears to be needed to explain the anomaly seen in the cross section ratio for light nuclei, whereas it is unimportant for heavy nuclei as the consequence of two effects, i.e. nuclear shell effect and size effect. An experiment has been performed to measure the /sup 127/I(..pi../sup + -/,X)/sup 127-x/I reaction cross sections in the (3,3) resonance region (60-350 MeV), using activation techniques. The results obtained have been compared with the ISOBAR-DFF calculation. Pion inelastic scattering followed by evaporation is the dominant mechanism except for /sup 126/I, i.e. single-nucleon removal, for which the importance of this mechanism and that of direct knockout are comparable. The mass loss in the evaporation process appears to be more significant than that in the cascade process. The cross sections due to ..pi../sup +/ absorption have been estimated phenomenologically. Pion absorption is significant only for the formation of low mass iodine isotopes at low energies. The ISOBAR-DFF code reproduces the overall features in the reactions studied. However, this code generally underestimates the cross sections and may overestimate those associated with pion absorption.
- Research Organization:
- Purdue Univ., Lafayette, IN (USA)
- OSTI ID:
- 5756201
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALKALINE EARTH ISOTOPES
BOSONS
CARBON 12
CARBON ISOTOPES
DIRECT REACTIONS
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GOLD 197
GOLD ISOTOPES
HADRONS
HEAVY NUCLEI
INTERMEDIATE MASS NUCLEI
IODINE 127
IODINE ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
MAGNESIUM 25
MAGNESIUM ISOTOPES
MESONS
MULTI-NUCLEON TRANSFER REACTIONS
NUCLEAR REACTIONS
NUCLEI
ODD-EVEN NUCLEI
PIONS
PSEUDOSCALAR MESONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
STABLE ISOTOPES
TRANSFER REACTIONS
400600* -- Radiation Chemistry
ALKALINE EARTH ISOTOPES
BOSONS
CARBON 12
CARBON ISOTOPES
DIRECT REACTIONS
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GOLD 197
GOLD ISOTOPES
HADRONS
HEAVY NUCLEI
INTERMEDIATE MASS NUCLEI
IODINE 127
IODINE ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
MAGNESIUM 25
MAGNESIUM ISOTOPES
MESONS
MULTI-NUCLEON TRANSFER REACTIONS
NUCLEAR REACTIONS
NUCLEI
ODD-EVEN NUCLEI
PIONS
PSEUDOSCALAR MESONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
STABLE ISOTOPES
TRANSFER REACTIONS