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

Mass–yield distributions of fission products from photo-fission of nat Pb induced by 50–70 MeV bremsstrahlung,10.1007/s10967-009-0383-1,Journal of Rad

Mass–yield distributions of fission products from photo-fission of nat Pb induced by 50–70 MeV bremsstrahlung  
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Haladhara Naik, Guinyun Kim, Ashok Goswami, Sarbjit Singh, Vijay Kumar Manchanda, Devesh Raj, Srinivasan Ganesan, Young Do Oh, Hee-Seock Lee, Kyung Sook Kim, Man-Woo Lee, Moo-Hyun Chohttp://academic.research.microsoft.com/io.ashx?type=5&id=22499906&selfId1=0&selfId2=0&maxNumber=12&query=
The mass–yield distributions of various fission products have been determined in the 50-, 60- and 70-MeV end point bremsstrahlung induced fission of natPb 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 209Bi the following observations were obtained: (i) The average masses of the yield distributions in the 50–85 MeV bremsstrahlung induced fission of natPb and 209Bi 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 209Bi, whereas it was not seen in case of natPb. This may be due to the presence of so many isotopes in natPb unlike mono-isotopic 209Bi.
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