Speaker
Description
Present
work provides a review about experiments carried out with separators GRAND
[1-2] and SHELS [3-4]. The latter is a modernization of the kinematical electrostatic
separator VASSILISSA [5–6]. GRAND is a new gas-filled separator designed to
operate with high-intensity beams delivered by the cyclotron DC-280. It was
constructed within the framework of the SHE Factory project [7] in 2019. Several
types of detection systems are employed on both separators. The SFINX system
[8] is applied to measure the yield of neutrons per act of spontaneous fission (SF);
the GABRIELA detector array [9] is used for α-, β-, and γ-spectroscopy of nuclei;
and a silicon “CryoDetector” operating under a temperature gradient is utilized for
chemical studies of SHE. The investigations were performed in the region of
neutron-deficient nuclei with atomic numbers Z = 94 and 102 (see Pic. 1) in
complete fusion reactions of 204,206,208Pb with 26Mg and 48Ca ions. A new
isotope 227Pu was discovered [10]. In reactions of 207Pb and 238U with 22Ne,
26Mg and 54Cr ions, the yield of neutrons per act SF was measured and the decay
mode for nuclei with Z = 102, 104 and 106 were studied, see Pic 1. Pic 1. Nuclear
map, where the isotopes studied in experiments are indicated by frames.
[1]Kuznetsova A.A., Bulletin of the Russian Academy of Sciences: Physics, 2023,
Vol. 87, No. 8, pp. 1105–1111. [2] A. V. Yeremin, A. G. Popeko, A. I. Svirikhin, et
al., Phys. Part. Nuclei Lett. 21, 518–525 (2024). [3] Yeremin, A.V., Popeko, A.G.,
Malyshev, O.N., et al., Phys. Part. Nucl. Lett., 2015, vol. 12, no. 1, p. 35. [4]
Yeremin, A.V., Popeko, A.G., Malyshev, O.N., et al., Phys. Part. Nucl. Lett., 2015,
vol. 12, no. 1, p. 43. [5] Yeremin A.V., et al., Nucl. Instr. and Meth. B 126 (1997)
329. [6] Malyshev O.N., et al., Nucl. Instr. and Meth. A 440 (2000) 86. [7]
Gulbekian G. G., Dmitriev S. N., and. Itkis M. G, Phys. Part. Nucl. Lett. 16, 866
(2019). [8] Lopez-Martens A. et al. (Gabriela Collab.), Eur. Phys. J. A 58, 134
(2022). [9] Isaev A. V., Yeremin A.V., Zamyatin N. I. et. al., Phys. Part. Nucl. Lett.,
2022, vol. 19, no. 1, p. 37. [10] A.A. Kuznetsova, A.I. Svirikhin, A.V. Isaev et al,
Physics of Particles and Nuclei Letters, 2025. ISSN 1547-4771, 2025, Vol. 22, No.2, pp. 406–412.
