Speaker
Description
Multinucleon Transfer (MNT) reactions offer a promising path to produce neutron-rich isotopes [1]. Many facilities worldwide are studying this process to better understand the underlying mechanisms as well as the competing reaction channels.
At the Accelerator Laboratory of the University of Jyväskylä, we studied these processes using the gas-filled recoil separator RITU [2] in combination with the JUROGAM 3 $\gamma$-ray detector array [3]. This setup allows the correlation of prompt gamma-ray emissions with the recoil products detected in the focal plane of RITU. This method provides direct insight into the reaction mechanisms.
In this talk, I will present results from the reaction $^{64}$Ni + $^{238}$U, performed at energies near the Coulomb barrier. To trace the reaction products, I employed several correlation techniques, revealing signatures of both quasi-fission and MNT. Recoil-gated $\alpha$–$\alpha$ correlations were used to characterize quasi-fission fragments, $\gamma$–$\gamma$–$\gamma$ analysis identified target-like nuclei, and conversion electron–$\gamma$ correlations enabled, for the first time, the measurement of isomeric state lifetimes in transfer products close in mass and charge to $^{238}$U.
References:
[1] S. Heinz and H. M. Devaraja, Nucleosynthesis in multinucleon transfer reactions, The European Physical Journal A, vol.58, no.6, p.114, 2022, ISSN: 1434-601X. DOI: 10.1140/epja/s10050-022-00771-1. Online]. Available: https://doi.org/10.1140/epja/s10050-022-00771-1.
[2]: J.Saren et al.,Absolute transmission and separation properties of the gas-filled recoil separator RITU,Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol.654, no.1, pp.508-521, 2011.
[3] J. Pakarinen et al., The JUROGAM 3 spectrometer, The European Physical Journal A, vol.56, pp.1-8, 2020.