The study of neutron-rich nuclei production in the region of the closed shell N=126 in the multi-nucleon transfer reaction $^{136}$Xe+$^{208}$Pb

Abstract : The unexplored area of heavy neutron rich nuclei is extremely important for nuclear astrophysics investigations and, in particular, for the understanding of the r-process of astrophysical nucleogenesis. For the production of heavy neutron rich nuclei located along the neutron closed shell N=126 (probably the last "waiting point" in the r-process of nucleosynthesis) the low-energy multi-nucleon transfer reaction 136Xe+208Pb at Elab=870MeV was explored. Due to the stabilizing e ect of the closed neutron shells in both nuclei, N=82 and N=126, and the rather favorable proton transfer from lead to xenon, the light fragments formed in this process are well bound and the Q-value of the reaction is nearly zero. Measurements were performed with the PRISMA spectrometer in coincidence with an additional time-of-flight (ToF) arm on the +20 beam line of the PIAVE-ALPI accelerator in Legnaro, Italy. The PRISMA spectrometer allows identi cation of the A, Z and velocity of the projectile-like fragments (PLF), while the second arm gives access to the target-like fragments (TLF). Details on the experimental setup and preliminary results are reported.
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Submitted on : Monday, April 18, 2016 - 1:20:41 PM
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K. Novikov, I.M. Harca, E.M. Kozulin, S. Dmitriev, J. Itkis, et al.. The study of neutron-rich nuclei production in the region of the closed shell N=126 in the multi-nucleon transfer reaction $^{136}$Xe+$^{208}$Pb. 8th European Summer School on Experimental Nuclear Astrophysics, Sep 2015, Santa Tecla, Italy. pp.012020, ⟨10.1088/1742-6596/703/1/012020⟩. ⟨in2p3-01303578⟩

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