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Isotopic trends of quasifission and fusion-fission in the reactions <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi>Ca</mml:mi><mml:mprescripts /><mml:none /><mml:mn>48</mml:mn></mml:mmultiscripts><mml:mo>+</mml:mo><mml:mmultiscripts><mml:mi>Pu</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>239</mml:mn><mml:mo>,</mml:mo><mml:mn>244</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>
Background: Quasifission and fusion-fission are primary mechanisms to prevent the production of superheavy elements. The recent experimental measurements reveal that the fusion-evaporation cross section in the $3n$ reaction channel of $^{48}\mathrm{Ca}+^{239}\mathrm{Pu}$ is 50 times lower than using $^{244}\mathrm{Pu}$ as target nucleus [Utyonkov et al., Phys. Rev. C 92, 034609 (2015)]. …