No abstract available

[en] Abstract only

[en] In order to test CPT invariance theorem, PS189 aims at checking the equality of proton and antiproton masses via the measurement of the ratio of H^- and anti p masses using a radio-frequency mass spectrometer. Recent progress, including a resolving power of 6x10⁵, is presented. (orig.)

[en] The 41-cm double-focusing mass spectrometer at the University of Minnesota has been used to measure the atomic masses of ¹⁵²Sm and ¹⁵⁴Sm and the isotopic mass differences of most Sm and Gd isotopes. Through the use of a new generalized error signal technique, measurements on the narrow doublets of Sm and Gd chlorides gave improved mass differences over previous work in this mass region. Where intense peaks were available, the results are consistent with errors of 0.4 to 1.0 μu. The conventional wide doublet technique was used to measured Sm-hydrocarbon doublets, yielding the masses of ¹⁵²Sm and ¹⁵⁴Sm with errors of less than 4 μu. These new mass data, when combined with other mass measurements and reaction data of comparable accuracy, are used in a least-squares mass adjustment in the range of 141 to 160 u

[en] Achemes of magnetron, inverse-magnetron and magneto-discharge mass-spectrometers the sensitivity of which is 10³-10⁴ times higher than in existing devices are analysed. Current increase is achieved by using converting, cylindric beams between two coaxial cylinders for analysis. Theoretically considered are conditions for cutting-off the effect of inhomogeneity of the magnetic field that affect the resolution value in inverse-magnetron mass-spectrometers, as well as the distribution of charge density and electric field in magnetic discharge mass spectrometrs. The maximum application of high-current mass-spectrometers can be found in vacuum technology and as portable gas analyzers

[en] The properties of the error of the nuclear masses calculated from the transverse mass relations are analysed. The work assumes that the calculated errors of the nuclei whose masses are known experimentally behave as a sample selected randomly from a normal population having a zero mean and a standard deviation sigma. It is found that the errors of the calculated masses of nuclei far from the line of beta-stability behave as c₁dsup(3/2) where c₁ is a constant and d is the distance of the nucleus from the line of beta-stability. It is shown also that the errors related to the calculated mass differences behave as c₂dsup(1/2) where c₂ is another constant. (orig.)

[en] Exotic strange multibaryon states have been observed in the effective mass spectra of: Λπ^±, Λπ⁺π⁻, Λp, Λpp, Λπp, ΛΛ and ΛK⁰ _s , K⁰ _s p, K⁰ _s π^± subsystems. The measured Λ/π⁺ ratio for average multiplicities from the pC reaction is equal to (5.3 ± 0.8) × 10⁻², and it is approximately two times larger than the Λ/π⁺ ratio simulated by the FRITIOF model and than that of experimental pp reactions at the same energy. The observed wellknown resonances Σ*⁺ (1385) and K*^± (892) from PDG are good tests of this method. The mean value of the mass for the Σ*⁻(1385) resonance is shifted to 1370 MeV/c ² and the width is two times larger than the same value from PDG. Such kind of behavior for the width and invariant mass of Σ*⁻ (1385) resonance is interpreted as an extensive contribution from stopped Ξ⁻ → Λπ⁻ and medium effect. There is enhancement of the production contribution for all observed hyperons. A few events were registered by hypothesis of light H ⁰ and heavy H ^{0, +} dihyperons. Dihyperons were observed by weak decay channels: (Σ⁻ p), (Λpπ⁻), (Λpπ⁰), and (K ⁻ pp).

[en] The ⁴⁰Ca(⁴He,⁸He)³⁶Ca reaction has been used to provide the first observation of the nuclide ³⁶Ca. The Q value and mass excess were found to be -57.58 +- 0.04 and -6.44 +- 0.04 MeV, respectively. The new mass completes four members of the A = 36 isobaric quintet and hence serves as a test of the isobaric multiplet mass equation

[en] A new scheme of the experiment on measuring the short-living nuclide atom masses, based on applying the isobar doublet method for mass scale gauging, is proposed. Results of measuring masses of Rb isotope atom with A=91-97, performed using a prism mass-spectrometer on line with the LiYaF mass-separator and synchrocyclotron with 30-80 keV error are presented

[en] In the July issue, in the article, “Dynamic Range of Mass Accuracy in LTQ Orbitrap Hybrid Mass Spectrometer” by Alexander Makarov, Eduard Denisov, Oliver Lange, and Stevan Horning (Vol. 17, no. 7, pages 977–982), Figure 4 was printed in black and white, when it should have been published in color. The correct rendering of the figure, with its accompanying legend, is provided below: