Asymmetric and symmetric fission of excited nuclei of 180,190Hg and 184,192,202Pb formed in the reactions with 36Ar and 40,48Ca ions
Bogachev, A.A., Kozulin, E. M., Knyazheva, G. N., Itkis, I. M., Itkis, M. G., Novikov, K. V., Kumar, D., Banerjee, T., Diatlov, I. N., Cheralu, M., Kirakosyan, V.V., Mukhamejanov, Y. S., Pan, A. N., Pchelintsev, I. V., Tikhomirov, R. S., Vorobiev, I. V., Maiti, M., Prajapat, R., Kumar, R., . . . Vardaci, E. (2021). Asymmetric and symmetric fission of excited nuclei of 180,190Hg and 184,192,202Pb formed in the reactions with 36Ar and 40,48Ca ions. Physical Review C, 104(2), Article 024623. https://doi.org/10.1103/PhysRevC.104.024623
Published inPhysical Review C
©2021 American Physical Society
Background: Observation of asymmetric fission of 180Hg has led to intensive theoretical and experimental studies of fission of neutron-deficient nuclei in the lead region. Purpose: The study of asymmetric and symmetric fission modes of 180,190Hg and 184,192,202Pb nuclei. Methods: Mass-energy distributions of fission fragments of 180,190Hg and 184Pb formed in the 36Ar+144,154Sm and 40Ca+144Sm reactions, respectively, at energies near the Coulomb barrier have been measured using the double-arm time-of-flight spectrometer CORSET and compared with previously measured 192,202Pb isotopes produced in the 48Ca+144,154Sm reactions. The mass distributions for 180,190Hg and 184,192,202Pb together with old data for 187Ir, 195Au, 198Hg, 201Tl, 205,207Bi, 210Po, and 213At [J. Nucl. Phys. 53, 1225 (1991)] have been decomposed into symmetric and asymmetric fission modes. The total kinetic-energy distributions for different fission fragment mass regions have been analyzed for 180,190Hg and 184Pb. Results: The stabilization role of proton numbers at Z≈36, 38, Z≈45, 46, and Z=28/50 in asymmetric fission of excited preactinide nuclei has been observed. The high (≈145−MeV) and the low (≈128−MeV) energy components have been found in the total kinetic-energy distributions of 180,190Hg fission fragments corresponding to the fragments with proton numbers near Z≈46 and Z≈36, respectively. In the case of fission of 184Pb only the low-energy component (≈135MeV) for the fragments with masses corresponding to the proton numbers Z≈36 and 46 has been found. Conclusions: The studied properties of asymmetric fission of 180,190Hg and 184,192,202Pb nuclei point out the existence of well deformed proton shell at Z≈36 and less deformed proton shell at Z≈46. ...
PublisherAmerican Physical Society (APS)
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Additional information about fundingThis work was supported by the joint Grant from the Russian Foundation for Basic Research (Grant No.19-52-45023) and the Department of Science and Technology of the Ministry of Science and Technology of India (Grant No. INT/RUS/RFBR/387). A.N.A. was supported by the Grant from STFC (United Kingdom).
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