Speaker
Description
In the last decade, unprecedented fission experiments have been carried out at the
GSI/FAIR facility using the inverse kinematics technique in combination with state-
of-the-art detectors. For the first time in the long-standing history of fission, it was
possible to simultaneously measure and identify both fission fragments in mass and
atomic numbers [1] and obtain many correlations among them sensitive to the fission
process dynamics and the nuclear structure at the scission point [2, 3]. To go a step
further in the fission characterization, our goal is to study the fission yield
dependence on the excitation energy of the compound nucleus, which is relevant for
the fission fragment treatment in stellar nucleosynthesis r-process calculations [4,5].
In order to get access to this key observable, we carried out the first quasi-free
(p,2p)-fission experiment on ²³⁸U at GSI/FAIR in 2021. The quasi-free (p,2p)
scattering collisions induce fission through particle-hole excitations that can range
from few to ten’s of MeV, and the excitation energy can be obtained by the
measurement of the two outgoing protons. In this talk we will present first results on
the yields of fragments produced in quasi-free proton scattering on 238U at 560A
MeV. These yields will be compared to state-of-the-art model calculations to derive
the excitation energy of the fissioning systems.
References:
[1] A. Chatillon et al. 2019Phys. Rev. C99054628
[2] E. Pellereau et al. 2017Phys. Rev. C95064607
[3] J.-F. Martin et al. 2015Eur. Phys. J. A51p. 174
[4] N. Vassh et al., J. Phys. G: Nucl. Part. Phys. 46, 065202 (2019)
[5] T. Kajino et al., Prog. Part. Nucl. Phys. 107, 109 (2019)
