Barium and xenon isotope yields in photopion reactions of sup 133 Cs

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.42.1545· OSTI ID:6312834

Sakamoto, K; Hamajima, Y; Soto, M; Kubota, Y; Yoshida, M; Kunugise, A; Masatani, M ^[1]; Shibata, S; Imamura, M ^[2]; Furukawa, M ^[3]; Fujiwara, I ^[4]

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1. Department of Chemistry, Faculty of Science, Kanazawa University, Kanazawa 920 (Japan)
2. Institute for Nuclear Study, University of Tokyo, Tanashi, Tokyo 188 (Japan)
3. Department of Chemistry, Faculty of Science, Nagoya University, Nagoya 464 (Japan)
4. School of Economics, Otemon Gakuin University, Ibaragi, Osaka 567 (Japan)

Radiochemical yield measurements are reported for barium isotopes from {sup 133}Cs({gamma},{pi}{sup {minus}}{ital xn}){sup 133{minus}{ital x}}Ba for {ital x}=0, 2, 4, 5, 6, 7, and 9 for bremsstrahlung maximum end-point energies {ital E}{sub 0}=30--1050 MeV and for {sup 133}Xe from {sup 133}Cs({gamma},{pi}{sup +}){sup 133{ital m},{ital g}}Xe for {ital E}{sub 0}=300--1000 MeV. Emphasis was placed on Ba measurements near the pion threshold and for different target thicknesses in order to assess interfering secondary particle-induced reactions. Clear evidence of secondary reactions was found in the form of a shoulder in the yield curves for a range of values near {ital E}{sub 0}{approx lt}{ital Q}{sub {pi}{sup {minus}}}, the {ital Q}{sub {pi}{sup {minus}}} value of {sup 133}Cs({gamma},{pi}{sup {minus}}{ital xn}) reaction. This result was used for the correction of yields at {ital E}{sub 0}{approx gt}{ital Q}{sub {pi}{sup {minus}}} with the aid of reported measurements of photoproton spectra from {sup 12}C and other complex nuclei and cross sections of ({sup 133}Cs+{ital p}) reactions. The yields corrected for the secondaries {sigma}{sub {ital q}}({ital E}{sub 0}) were unfolded into cross sections per photon of energy {ital k}, {sigma}({ital k}). The characteristic features of {sigma}{sub {ital q}}({ital E}{sub 0}) and {sigma}({ital k}) are then discussed in terms of {ital E}{sub 0} and {ital k} dependences and product mass ({ital A}{sub {ital p}}=133{minus}{ital x}) by comparing the present results with those for other systems currently obtained by our group. It was found that the present results of {sigma}({ital k}) are generally reproduced by a cascade-evaporation calculation based on the PICA code of Gabriel and Alsmiller, only if the calculated values are shifted up in photon energy by 30 MeV and the neutron cutoff energy is chosen to be 1 MeV.

• OSTI ID: 6312834
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 42:4; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651720* -- Nuclear Properties & Reactions
A=90-149
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
BARIUM 124
BARIUM 126
BARIUM 127
BARIUM 128
BARIUM 129
BARIUM 131
BARIUM 133
BARIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CASCADE THEORY
CESIUM 133 TARGET
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GEV RANGE
GEV RANGE 01-10
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUCLEI
PHOTONUCLEAR REACTIONS
RADIOISOTOPES
TARGETS
XENON 133
XENON ISOTOPES
YIELDS