Abstract
The feasibility of the multi-nucleon transfer (MNT) reaction in the 136 Xe + 198 Pt system was investigated for synthesizing neutron-rich heavy nuclei around mass number A 200 of astrophysical interest. Identification of the projectile-like fragments (PLF's) was successfully performed by using VAMOS++ spectrometer. The isotopic distributions of the PLF's produced by two-proton stripping and pickup reactions were compared with each other, demonstrating the properties of the MNT reactions observed in the present system. The two-proton pickup channels strongly populated than the two- proton stripping channels were observed. The isotopic distributions for di erent total kinetic energy loss (TKEL) ranges are also discussed. The overall enhancement of the strength of the two-proton pickup compared with the two-proton stripping appears to be related to the MNT reactions with relatively moderate energy dissipation.
Highlights
Most experiments performed with medium mass projectiles at energies around the Coulomb barriers favored neutron pickup and proton stripping channels
The projectile-like fragment (PLF) was identified using information measured by the VAMOS++ spectrometer as described in Ref. [10]
The corrected yields were converted to the cross sections using a conversion factor obtained by matching the 136Xe yield to the calculated Rutherford scattering cross section
Summary
EPJ Web of Conferences order to produce such exotic heavy isotopes using the MNT reaction, proton pickup and neutron stripping reactions are necessary. Most experiments performed with medium mass projectiles at energies around the Coulomb barriers favored neutron pickup and proton stripping channels. Even with the neutron-rich medium mass projectile (e.g. 64Ni+238U), the proton pickup channels were accessible, but the proton stripping channels were still dominant [1]. The heavy neutron-rich projectile such as 136Xe which has a charge-to-mass ratio (Z/A) close to the target nucleus (e.g. 208Pb or 198Pt) is anticipated to give large cross sections for the MNT reactions producing neutron-rich target-like fragments (TLF’s) [2,3,4,5]. For more detailed investigation of feasibility of the MNT reaction for producing neutron-rich exotic nuclei, we performed an experiment using 136Xe+198Pt system where the projectile-like fragment (PLF) and TLF were identified simultaneously on event-by-event basis. Some preliminary results on the measured PLF of the two-proton transfer channels are presented
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