Abstract
The isotopic distribution of nuclei produced in the 50Ti + 249Cf reaction has been studied at the gas-filled recoil separator TASCA at GSI Darmstadt, which separates ions according to differences in magnetic rigidity. The bombardment was performed at an energy around the Bass barrier and with the TASCA magnetic fields set for collecting fusion-evaporation reaction products. Fifty-three isotopes located “north-east” of 208Pb were identified as recoiling products formed in non-fusion channels of the reaction. These recoils were implanted with energies in two distinct ranges; besides one with higher energy, a significant low-energy contribution was identified. The latter observation was not expected to occur according to kinematics of the known types of reactions, namely quasi-elastic, multi-nucleon transfer, deep-inelastic collisions or quasifission. The present observations are discussed within the framework of two-body kinematics passing through the formation of a composite system.
Highlights
During the last decades, heavy-ion induced reactions were largely exploited for various applications aiming to explore the entire chart of nuclei [1]
Energies were extracted from the traces collected with the digital branches (48 Y-strips), by adopting the single-signal amplitude estimation procedure
223Th isotopes. (b) Time distributions of α(215Ra) events in beam-off periods correlated with high-energy component (HEC) and low-energy component (LEC) recoils
Summary
Heavy-ion induced reactions were largely exploited for various applications aiming to explore the entire chart of nuclei [1]. The probability for fusion, leading to further fission and/or evaporation of light particles from the compound nucleus, may strongly be reduced due to the breaking of the composite system, often referred as dinuclear system, and depends on the properties of the reactants [4,5,6,7,8,9,10]. This increases the probability of the process complementary to fusion denoted as quasifission (QF) [4]. An alternative pathway featuring higher production yields for the synthesis of SHE, reducing the sometimes very long experimental duration [13] and allowing the synthesis of more neutron-rich isotopes than are accessible via fusion reactions, has been sought for decades [14,15]
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