Bromine and iodine excitation-function measurements with protons and deuterons at 3--17 MeV

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.47.248· OSTI ID:6831738

West, Jr, H I; Nuckolls, R M; Hudson, B; Ruiz, B; Lanier, R G; Mustafa, M G ^[1]

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1. University of California, Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)

We report nuclear excitation functions for the reactions [sup 79]Br[([ital p],[ital n])+([ital d],2[ital n])][sup 79]Kr, [sup 81]Br[([ital p],[ital n])+ ([ital d],2[ital n])][sup 81]Br, [sup 81]Br([ital d],[ital p])[sup 82]Br, and [sup 127]I[([ital p],[ital n])+([ital d],2[ital n])][sup 127]Xe. The measurements were made from reaction threshold to 17 MeV with the Lawrence Livermore National Laboratory's Tandem Van de Graaff accelerator using the stacked-foil method. The [sup 79]Br([ital d],2[ital n])[sup 79]Kr and the [sup 81]Br excitation functions are the first reported. The targets consisted of the halides dispersed in the plastic Kapton. The activated targets were assayed using [gamma] counting and mass spectrometry. We found that we had to remeasure the gamma intensities for the [sup 79]Kr decay. The excitation functions were modeled using the Hauser-Feshbach statistical-model code STAPRE, using the exciton preequilibrium model. We found a preference for the back-shifted (BS) level density prescription over the use of the Gilbert-Cameron prescription. For BS, the constant [ital K], governing the transition to equilibrium, was taken as 500 to 700 MeV[sup 3]. These values gave preequilibrium fractions consistent with those we obtained from ion-recoil range studies of light ion reactions. In general the modeling agreed well with experiment. For the deuteron induced reactions, we had to allow for deuteron breakup using a microscopic breakup fusion approach developed by Udagawa and Tamura. Our analysis of the stripping reaction, [sup 81]Br([ital d],[ital p])[sup 82]Br, by this procedure is especially noteworthy.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6831738
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 47:1; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BROMINE 79 TARGET
BROMINE 81
BROMINE 81 TARGET
BROMINE 82
BROMINE ISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
DEUTERON REACTIONS
DIRECT REACTIONS
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY RANGE
EVEN-ODD NUCLEI
EXCITATION FUNCTIONS
FERMIONS
FUNCTIONS
GAMMA RADIATION
HADRON REACTIONS
HADRONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IODINE 127 TARGET
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KRYPTON 79
KRYPTON IS
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
MINUTES LIVING RADIOISOTOPES
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
ODD-EVEN NUCLEI
ODD-ODD NU
PROTON REACTIONS
PROTONS
RADIATIONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
STABLE ISOTOPES
TARGETS
XENON 127
XENON ISOTOPES