منابع مشابه
Determination of the electron's atomic mass and the proton/electron mass ratio via Penning trap mass spectroscopy.
Accuracy of the electron's atomic mass has been improved tenfold by comparing cyclotron frequencies of electrons and single C + ions alternately confined to the same uniform magnetic field in a Penning trap. Cyclotron resonances are observed via frequency shifts in the particle's continuously monitored harmonic motion parallel to the field. Field instability and relativity cause, respectively, ...
متن کاملStability of the proton-to-electron mass ratio.
We report a limit on the fractional temporal variation of the proton-to-electron mass ratio as 1/(m(P)/m(e)) partial differential/partial differential(t)(m(P)/m(e))=(-3.8+/-5.6) x 10(-14) yr(-1), obtained by comparing the frequency of a rovibrational transition in SF6 with the fundamental hyperfine transition in Cs. The SF6 transition was accessed using a CO2 laser to interrogate spatial 2-phot...
متن کاملOn a Variation of the Proton-electron Mass Ratio
W. UBACHS, R. BUNING, E. J. SALUMBIDES, S. HANNEMANN, H. L. BETHLEM, D. BAILLY, M. VERVLOET, L. KAPER, M. T. MURPHY Laser Centre Vrije Universiteit Amsterdam, The Netherlands Laboratoire de Photophysique Moléculaire, Université de Paris-Sud, Orsay, France Synchrotron Soleil, Gif-sur-Yvette, France Instituut Anton Pannekoek, Universiteit van Amsterdam, The Netherlands Institute of Astronomy, Cam...
متن کاملTime dependence of the proton - to - electron mass ratio ✩
We have measured with high precision the position of 79 molecular hydrogen absorption lines of Lyman and Werner bands from two absorption systems at zabs = 2.594733 and 3.024899, in the spectra of quasars Q 0405–443 and Q 0347–383, respectively, in order to constrain the cosmological variation of the proton-to-electron mass ratio, μ = mp/me. Data are of the highest spectral resolution (R = 53 0...
متن کاملNucleon spin structure and mass of quarks
The alternative to the standard formulation of the quark-parton model is proposed. Our approach is based on the new solution of the master equations relating the structure and distribution functions, which consistently takes into account the intrinsic quark motion in contradistinction to the standard infinite momentum approach, in which this motion is latently suppressed. The model well reprodu...
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ژورنال
عنوان ژورنال: Nature
سال: 1960
ISSN: 0028-0836,1476-4687
DOI: 10.1038/185602b0