Mass–yield distributions of fission products from photo-fission of natPb induced by 50–70 MeV bremsstrahlung

The mass–yield distributions of various fission products have been determined in the 50-, 60- and 70-MeV end point bremsstrahlung induced fission of nat Pb using off-line γ-ray spectrometric technique in the electron linac at Pohang Accelerator Laboratory, Korea. The mass–yield distributions are sym...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2010-02, Vol.283 (2), p.439-445
Main Authors: Naik, Haladhara, Kim, Guinyun, Goswami, Ashok, Singh, Sarbjit, Manchanda, Vijay Kumar, Raj, Devesh, Ganesan, Srinivasan, Oh, Young Do, Lee, Hee-Seock, Kim, Kyung Sook, Lee, Man-Woo, Cho, Moo-Hyun, Ko, In Soo, Namkung, Won
Format: Article
Language:English
Subjects:
Accelerators
Bremsstrahlung
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Energy (nuclear)
Energy distribution
Fission
Fission products
Hadrons
Heavy Ions
Inorganic Chemistry
Nuclear Chemistry
Nuclear fission
Nuclear Physics
Physical Chemistry
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Summary:The mass–yield distributions of various fission products have been determined in the 50-, 60- and 70-MeV end point bremsstrahlung induced fission of nat Pb using off-line γ-ray spectrometric technique in the electron linac at Pohang Accelerator Laboratory, Korea. The mass–yield distributions are symmetric with average mass of 102.34, 102.25 and 102.03 and FWHM of 21, 22 and 23 mass unit, respectively. From the present data and literature data in the 50–85 MeV bremsstrahlung induced fission of 209 Bi the following observations were obtained: (i) The average masses of the yield distributions in the 50–85 MeV bremsstrahlung induced fission of nat Pb and 209 Bi are around 102.25 ± 0.25 and 103 ± 0.5, respectively. (ii) The FWHM of the mass–yield distributions increases from about 21 mass units at 50 MeV to 23 mass units at 70–85 MeV, which is explained from the point of increase in multi-chance fission probability with increasing excitation energy. (iii) Within the bremsstrahlung energy range of 50–85 MeV, the role of nuclear structure effect in the mass–yield distribution was observed in the photo-fission of 209 Bi, whereas it was not seen in case of nat Pb. This may be due to the presence of so many isotopes in nat Pb unlike mono-isotopic 209 Bi.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-009-0383-1