Measurement of photo-neutron cross sections and isomeric yield ratios in the Y-89(gamma,xn)Y89-x reactions at the bremsstrahlung end-point energies of 65, 70 and 75 MeV
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SCOPUS
- Title
- Measurement of photo-neutron cross sections and isomeric yield ratios in the Y-89(gamma,xn)Y89-x reactions at the bremsstrahlung end-point energies of 65, 70 and 75 MeV
- Authors
- Tatari, Mansoureh; Naik, Haladhara; Kim, Guinyun; Kim, Kwangsoo; Shin, Sung-Gyun; Cho, Moo-Hyun
- Date Issued
- 2017-10
- Publisher
- OLDENBOURG VERLAG
- Abstract
- The flux-weighted average cross sections of the Y-89(gamma,xn; x = 1- 4)Y-89 x reactions and the isomeric yield ratios of the Y-87m,Y-g, Y-86m,Y-g, and (85m,)gY radionuclides produced in these reactions with the bremsstrahlung end-point energies of 65, 70 and 75 MeV have been determined by an activation and off-line gamma-ray spectrometric technique using the 100 MeV electron linac in Pohang Accelerator Laboratory, Korea. The theoretical Y-89(gamma, xn; x = 1-4)Y89-x reactioncross sections for mono- energetic photonshave been calculated using the computer code TALYS 1.6. Then the flux- weighted theoretical values were obtaind to compare with the present data. The flux- weighted experimental and theoretical (89Y)(gamma,xn; x =1-4)Y89-x reaction cross sections increase very fast from the threshold values to a certain bremsstrahlung energy, wherethe other reaction channels open up. Thereafter it remains constant a while and then slowly decreases with the increase of cross sections for other reactions. Similarly, the isomeric yield ratios of Y-87m,Y-g, Y-86m,Y-g and Y-85m,Y- in the Y-89(gamma,xn; x =2-4)Y89-x reactions from the present work and literature data show an increasing trend from their respective threshold values to a certain bremsstrahlung energy. After a certain point ofenergy, the isomeric yield ratios increase slowly with the bremsstrahlung energy. These observations indicate therole of excitation energy and its partitioning in different reaction channels.
- Keywords
- PHOTONUCLEAR REACTIONS; INTERMEDIATE ENERGIES; ACTIVATION-ANALYSIS; COMPOUND NUCLEUS; Y-89; RADIATION; GAMMA,N; TARGETS; PHOTONEUTRONS; RADIOTHERAPY
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/92009
- DOI
- 10.1515/ract-2016-2741
- ISSN
- 0033-8230
- Article Type
- Article
- Citation
- RADIOCHIMICA ACTA, vol. 105, no. 10, page. 789 - 799, 2017-10
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