The project of the mass separator of atomic nuclei produced in heavy ion induced reactions

Oganessian, Yu. Ts.; Shchepunov, V.A.; Dmitriev, S. N.; Иткис, М. Г.; Gulbekyan, G. G.; Khabarov, M. V.; Bekhterev, V. V.; Bogomolov, S. L.; Efremov, A.; Pashenko, S.V.; Stepantsov, S. V.; Yeremin, A. V.; Yavor, M.I.; Kalimov, A.

doi:10.1016/s0168-583x(02)02138-9

Cited by 27 publications

(6 citation statements)

References 8 publications

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“…With the advent of mass spectrometry, it is possible to measure masses of some of the short-lived nuclei spanning almost the entire periodic table [3,4]. For example, the isotope separator online (ISOL)-based mass analyzer for superheavy atoms (MASHA) [5,6] coming up at JINR-Dubna will be able to directly measure the masses of separated atoms in the range 112 Z 120. The limitation on measurements is set by the shortest measurable half-life, T 1/2 ∼ 1.0 s [5].…”

Section: Introductionmentioning

confidence: 99%

Microscopic-macroscopic approach for binding energies with the Wigner-Kirkwood method

et al. 2010

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The semiclassical Wigner-Kirkwoodh expansion method is used to calculate shell corrections for spherical and deformed nuclei. The expansion is carried out up to fourth order inh. A systematic study of Wigner-Kirkwood averaged energies is presented as a function of the deformation degrees of freedom. The shell corrections, along with the pairing energies obtained by using the Lipkin-Nogami scheme, are used in the microscopic-macroscopic approach to calculate binding energies. The macroscopic part is obtained from a liquid drop formula with six adjustable parameters. Considering a set of 367 spherical nuclei, the liquid drop parameters are adjusted to reproduce the experimental binding energies, which yields a root mean square (rms) deviation of 630 keV. It is shown that the proposed approach is indeed promising for the prediction of nuclear masses.

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Section: Introductionmentioning

confidence: 99%

Microscopic-macroscopic approach for binding energies with the Wigner-Kirkwood method

et al. 2010

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“…The ion optical scheme of the mass spectrometer was comprehensively considered in [7]. In this section, we describe separate units of the setup and present results of measurements of the key separator characteristics.…”

Section: Masha Separator On the Heavy Ion Beam For Determining Massesmentioning

confidence: 99%

“…However, by contrast to the classical mass spectrometry, the masses of new nuclides must be measured online, i.e., directly in the course of their synthesis on accelerated heavy ion beams similarly to the well known ISOL method [6]. To do this, the Mass Analyzer of Super Heavy Atoms (MASHA) has been designed and pro duced by the FLNR, JINR [7]. The unique potential of the mass analyzer can be attributed to its capabilities of measuring the masses of synthesized superheavy element isotopes and, simultaneously, of detecting their α decays and (or) spontaneous fission.…”

Section: Introductionmentioning

confidence: 99%

MASHA separator on the heavy ion beam for determining masses and nuclear physical properties of isotopes of heavy and superheavy elements

et al. 2014

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The MASHA mass spectrometer designed for identifying superheavy elements by their masses is described. The separation efficiency has been measured in the autonomous mode using four calibrated leak ages of noble gases. The total separation efficiency of the mass spectrometer with a hot catcher and an ion source based on the electron cyclotron resonance has been determined using the 40 Ar beam. Test experiments have been carried out, in which α active Hg isotopes produced in complete fusion reaction 40 Ar + 144 Sm -xnHg + xn, have been detected in the focal plane of the mass spectrometer. The separation time and effi ciency have been determined for short lived Hg isotopes.

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“…In the FLNR it was shown that the lifetime of the synthesized isotopes of 112 and 114 elements is higher than 0.5 s and both elements are volatile at room temperature [1]. Thus, experiments on mass measurements of the isotopes of these elements by mass-spectrometer technique with ECR ion source [2,3] can be carried out. For the first time, such a technique was proposed in our labor and the appropriate mass-spectrometer-MASHA-was planed and realized.…”

Section: Introductionmentioning

confidence: 99%

Application of the mass-spectrometer MASHA for mass-spectrometry and laser-spectroscopy

et al. 2010

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We report the present status of the mass-spectrometer MASHA (MassAnalyzer of Supper Heavy Atoms) designed for determination of the masses of superheavy elements. The mass-spectrometer is connected to the U-400M cyclotron of the Flerov Laboratory for Nuclear Reactions (FLNR) JINR, Dubna. The first experiments on mass-measurements for 112 and 114 elements will be performed in the upcoming 2010. For this purpose a hot catcher, based on a graphite stopper, is constructed. The α-decay of the superheavy nuclides or spontaneous fission products will be detected with a silicon 192 strips detector. The experimental program of future investigations using the technique of a gas catcher is discussed. It should be regarded as an alternative of the classical ISOL technique. The possibilities are considered for using this mass-spectrometer for laser spectroscopy of nuclei far off-stability.Keywords Mass-analyzer · ECR source · Gas catcher technique · Superheavy elements · Masses of superheavy elements · Isotopes of 112 and 114 elements

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The project of the mass separator of atomic nuclei produced in heavy ion induced reactions

Cited by 27 publications

References 8 publications

Microscopic-macroscopic approach for binding energies with the Wigner-Kirkwood method

Microscopic-macroscopic approach for binding energies with the Wigner-Kirkwood method

MASHA separator on the heavy ion beam for determining masses and nuclear physical properties of isotopes of heavy and superheavy elements

Application of the mass-spectrometer MASHA for mass-spectrometry and laser-spectroscopy

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