Start-Up of the DC-280 Cyclotron, the Basic Facility of the Factory of Superheavy Elements of the Laboratory of Nuclear Reactions at the Joint Institute for Nuclear Research

Gulbekian, G. G.; Дмитриев, С. Н.; Иткис, М. Г.; Oganessyan, Yu. Ts.; Gikal, B. N.; Kalagin, I. V.; Semin, Vasiliy; Bogomolov, S. L.; Buzmakov, V. A.; Ivanenko, Ivan; Kazarinov, N. Yu.; Osipov, Nikolay; Pashenko, S. V.; Sokolov, V. E.; Pchelkin, N. N.; Prokhorov, S. V.; Khabarov, M. V.; Gikal, K. B.

doi:10.1134/s1547477119060177

Cited by 34 publications

(3 citation statements)

References 6 publications

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“…For further physical and chemical studies of SHEs, Super Heavy Element Factory (SHE Factory) was constructed at FLNR JINR. The facility is based on a new DC280 heavy-ion accelerator that can deliver 48 Ca beams with a design intensity of 6*10 13 ions per second [4]. The first experimental setup of the SHE Factory is a Dubna Gas-Filled Recoil Separator 2 (DGFRS-2) with a Q 𝑣 D ℎ Q ℎ Q 𝑣 D magnetic configuration.…”

Section: Introductionmentioning

confidence: 99%

Simulations of recoil trajectories in Dubna Gas-Filled Recoil Separator 2 by GEANT4 toolkit

Solovyev

Kovrizhnykh

2022

J. Inst.

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Dubna Gas-Filled Recoil Separator (DGFRS-2) is a new facility at the Super Heavy Element Factory which allows us to study the properties of superheavy elements (SHEs) formed in complete fusion reactions in the femtobarn cross-section range. High dispersion and complex magnetic configuration make it difficult to tune the separator and find the optimal current values in the magnetic elements. This work presents a simulation model of the DGFRS-2 based on a GEANT4 toolkit. The main methods of trajectory simulations of heavy ions in gaseous media are discussed and several new processes are implemented in GEANT4. Calculation results agreed well with the data produced in test experiments which allows us to use this model for transmission determination and tuning of the separator in experiments aimed at SHE investigations.

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Section: Introductionmentioning

confidence: 99%

Simulations of recoil trajectories in Dubna Gas-Filled Recoil Separator 2 by GEANT4 toolkit

Solovyev

Kovrizhnykh

2022

J. Inst.

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“…This achievement raises the question of expanding the table of nuclides even further. One possibility is the operation of the Factory of SHN at the Joint Institute for Nuclear Research (Dubna) [5,10], which could offer a new avenue for studying and producing new isotopes of superheavy nuclei at moderate excitation energies (E CN ≥ 50 MeV). Nevertheless, the rate at which the survival probability of the CN and, consequently, the cross-section for evaporation residues decrease with the augmentation of beam energy remains a subject of ongoing inquiry [11,12].…”

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confidence: 99%

Level-density parameters in superheavy nuclei

Rahmatinejad

Bezbakh

Shneidman³

et al. 2021

Phys. Rev. C

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The probabilities of xn-, pxn-, and αxn-evaporation channels in excited superheavy nuclei were evaluated using the Monte Carlo method. The calculations utilized microscopically determined nuclear level densities and were compared with results obtained from the phenomenological Jackson formula. Effective temperatures derived from the microscopic approach were incorporated into the Jackson formula for different evaporation channels at low and moderate excitation energies.Additionally, an analytical formula was introduced to estimate the average kinetic energy of emitted particles in multi-step processes.

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“…It would be interesting to compare the production cross sections in the hot and cold fusion reactions leading to the same neutron-deficient residual nuclei. With the planned increase of the beam intensity (of ∼ 10 pµA on target) [17] combined with the new Dubna gas-filled magnetic recoil separator (DGFS) setup [2], such extremely low cross sections will soon be measurable.…”

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confidence: 99%

Rate of decline of the production cross section of superheavy nuclei with Z=114–117 at high excitation energies

et al. 2021

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The production cross sections of superheavy nuclei with charge numbers 114 − 117 are predicted in the (5 − 9)n-evaporation channels of the 48 Ca-induced complete fusion reactions for future experiments. The estimates of synthesis capabilities are based on a uniform and consistent set of input nuclear data provided by the multidimensional macroscopic-microscopic approach. The contributions of various factors to the final production cross section are discussed. As shown, the specific interplay between survival and fusion probabilities unexpectedly leads to a relatively slow decline of the total cross-sections with increasing excitation energy. This effect is supported by a favorable arrangement of fission barriers protecting the compound nucleus against splitting concerning energetic thresholds for the emission of successive neutrons. In particular, the probabilities of the formation of superheavy nuclei in the 5n-, 6n-, and in some cases even in 7n-evaporation channels are still promising. This may offer a new opportunity for the future synthesis of unknown neutron-deficient superheavy isotopes.

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Start-Up of the DC-280 Cyclotron, the Basic Facility of the Factory of Superheavy Elements of the Laboratory of Nuclear Reactions at the Joint Institute for Nuclear Research

Cited by 34 publications

References 6 publications

Simulations of recoil trajectories in Dubna Gas-Filled Recoil Separator 2 by GEANT4 toolkit

Simulations of recoil trajectories in Dubna Gas-Filled Recoil Separator 2 by GEANT4 toolkit

Level-density parameters in superheavy nuclei

Rate of decline of the production cross section of superheavy nuclei with Z=114–117 at high excitation energies

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