In Penning traps charged particles are subject to a strong axial magnetic field and a weak electrostatic quadrupole field, which makes the particles moving with three independent frequencies. The quadrupole field can be generated either by using hyperboloidal or a set of cylindrical electrodes. A cyclotron frequency measurement gives access to an accurate value of the ion mass. This can be performed either by the determination of images currents in a ring electrode or by using a time-of-flight method after excitation of the ion motion. In 1970 Hans Dehmelt et al. measured the g-factors of a free electron and positron as well as their masses using a Penning trap. This lead to a shared Nobel Prize in Physics in 1989. These measurements were the overture to a large number of fundamental experiments. The experimental g-factor was compared to the value predicted by QED, which indirectly gives the fine structure constant α at an uncertainty of 4 ppb. The obvious question is to what extent the g-factor is changed when the electron is bound in a hydrogen-like ion. To obtain an answer a dedicated set of traps was constructed by the GSI-Mainz collaboration. Recently, a different way of calculating α was proposed. It is based on laser photon recoil experiments and may result in an even a more accurate value of α that is independent of QED. This a method requires very accurate mass values of the electron, the proton and 133 C s . Precise mass and g-factor measurements offer CPT-tests. Accurate mass values of 3 H and 3 He, i.e. the Q-value of the 3 H decay, may enter in future experiments on the beta spectrum of 3 H searching for a finite rest mass of the electron antineutrino. The mass difference between 76 Ge and 76 Se is indispensable in the analysis of the data searching for the standard model violating neutrinoless double beta decay of 76 Ge. Accurate masses of 28 Si and 197 Au are needed in efforts for a new definition of the kilogram based on atomic quantities.
The competition ‘First Step to Nobel Prize in Physics’
This paper presents the history of the competition First Step to Nobel Prize in Physics organized by Poland, its development from a national workshop in 1991/92 to an international competition nowadays and its organization, as well as the results obtained by the participants.
Read moreBuilding Blocks of Photovoltaic Energy Harvesting Systems [Women-In-Circuits Column
Photovoltaic energy harvesting systems have a wide range of applications, from solar-powered spacecraft to solar-powered calculators. The discovery of the photoelectric effect was made around 1920 by outstanding physicists Max Planck and Albert Einstein. Max Planck received the Nobel Prize in Physics for his discovery of energy quanta, and Albert Einstein received the Nobel Prize in Physics for the discovery of the law of the photoelectric effect. Light, Einstein said, is a beam of particles whose energies are related to their frequencies according to Planck’s formula. When that beam is directed at a metal, the photons collide with the atoms. If a photon’s frequency is sufficient to knock off an electron, the collision produces the photoelectric effect <xref ref-type="bibr" rid="ref1" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[1]</xref>.
Read moreRevolutionizing Optimization and Deep Learning: A Thermodynamic Hybrid Network Inspired by the Nobel Prize in Physics 2024
The 2024 Nobel Prize in Physics, awarded to John J. Hopfield and Geoffrey E. Hinton, recognized their foundational contributions to artificial neural networks (ANNs) and machine learning. This paper introduces a novel Thermodynamic Hybrid Network that merges Hopfield networks' energy minimization capabilities with the probabilistic dynamics of Restricted Boltzmann Machines (RBMs). Leveraging thermodynamic principles, this hybrid architecture addresses large-scale optimization challenges, such as the Traveling Salesman Problem and protein structure prediction, while overcoming the limitations of conventional ANNs. This approach bridges the gap between classical deterministic models and stochastic methods, opening the door to more efficient machine learning solutions across fields like computational biology, quantum computing, and materials science.
Read moreニュートリノとフレーバーの起源( ニュートリノの物理-小柴昌俊氏のノーベル物理学賞受賞を記念して-)
ニュートリノとフレーバーの起源( ニュートリノの物理-小柴昌俊氏のノーベル物理学賞受賞を記念して-)
Dictionary of Technical Terms (<Special Issue>Physics of Neutrino - Commemorating Masatoshi Koshiba's Winning of the Nobel Prize in Physics -)
Dictionary of Technical Terms (<Special Issue>Physics of Neutrino - Commemorating Masatoshi Koshiba's Winning of the Nobel Prize in Physics -)
Read moreEDITORIAL
As a tribute to the winners of the Nobel Prize in Physics 2016, theeditorial board of Momento Revista de Física decided to reproducea small part of their work for which they were deserving of thisrecognition. Our readers interested in the subject can see the linkhttps:www.nobelprize.orgnobel_prizesphysicslaureates2016 advanced-physicsprize2016.pdfStrange phenomena in matter's atlandsThis year's Laureates opened the door on an unknown world wherematter exists in strange states. The Nobel Prize in Physics 2016 isawarded with one half to David J. Thouless, University of Washington,Seattle, and the other half to F. Duncan M. Haldane, PrincetonUniversity, and J. Michael Kosterlitz, Brown University, Providence...
Read moreSolar Neutrino Experiments : Now and Future (<Special Issue>Physics of Neutrino - Commemorating Masatoshi Koshiba's Winning of the Nobel Prize in Physics -)
Solar Neutrino Experiments : Now and Future (<Special Issue>Physics of Neutrino - Commemorating Masatoshi Koshiba's Winning of the Nobel Prize in Physics -)
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5The structure of Lippmann heliochromes: Cajal and the 1908 Nobel Prize in Physics
The structure of Lippmann heliochromes: Cajal and the 1908 Nobel Prize in Physics
1Marietta Blau in the history of cosmic rays
Carlson replies: Ruth Lewin Sime correctly points out the important contributions to the nuclear emulsion technique by Marietta Blau, which are unfortunately often forgotten. Blau, together with Hertha Wambacher, observed cosmic-ray-induced “stars” in 1937. In my article, I pointed out that many results of fundamental importance were indeed obtained using nuclear emulsions, in particular the discovery of the pion that earned Cecil Powell the 1950 Nobel Prize in Physics.In 1950 Blau and Wambacher were nominated for the Nobel Prize in Physics for the method of exposing sets of emulsion plates at high altitude and for observing cosmic-ray-induced stars.11. Minutes of the Royal Swedish Academy of Sciences on Nobel Matters, Nobel Archives, Royal Swedish Academy of Sciences, Stockholm (1950), p. 391. Among the other 28 nominees that year was Cecil Powell, who received 16 nominations.Contrary to what Sime says, the names of Blau and Wambacher are not absent from the “Nobel texts.” In its 1950 recommendation to the Royal Swedish Academy of Sciences, the Nobel Committee for Physics included as an enclosure a nine-page detailed and accurate account, written by committee member Axel Lindh,22. Minutes of the Royal Swedish Academy of Sciences on Nobel Matters, Nobel Archives, Royal Swedish Academy of Sciences, Stockholm (1950), p. 132. on the work by Blau and Wambacher. Lindh wrote that without any doubt Blau and Wambacher were the first to use plates of emulsions to study cosmic rays and the first to use the technique to observe cosmic-ray-induced stars, a phenomenon earlier observed in cloud chambers. Lindh noted that Wambacher, in a 1938 paper,33. H. Wambacher, Phys. Z. 39, 883 (1926). wrote that E. G. Steinke was the one who had proposed using emulsions to study cosmic-ray stars. In his conclusion, Lindh acknowledged the pioneering work by Blau and Wambacher but noted that it was not of sufficient significance for a Nobel Prize.The committee report44. Minutes of the Royal Swedish Academy of Sciences on Nobel Matters, Nobel Archives, Royal Swedish Academy of Sciences, Stockholm (1950), p. 81. discussing the nomination of Blau and Wambacher states that among the notable descriptions of progress made using the emulsion technique are a 1925 article in which Blau says that protons also can be observed and one by Blau and Wambacher in 1937 reporting cosmic-ray-induced stars. The report ends with the proposal to award the 1950 Nobel Prize in Physics to Powell.REFERENCESSection:ChooseTop of pageREFERENCES <<CITING ARTICLES1. Minutes of the Royal Swedish Academy of Sciences on Nobel Matters, Nobel Archives, Royal Swedish Academy of Sciences, Stockholm (1950), p. 391. Google Scholar2. Minutes of the Royal Swedish Academy of Sciences on Nobel Matters, Nobel Archives, Royal Swedish Academy of Sciences, Stockholm (1950), p. 132. Google Scholar3. H. Wambacher, Phys. Z. 39, 883 (1926). Google ScholarCrossref4. Minutes of the Royal Swedish Academy of Sciences on Nobel Matters, Nobel Archives, Royal Swedish Academy of Sciences, Stockholm (1950), p. 81. Google Scholar© 2012 American Institute of Physics.
Read moreNobel Prize in Physics. Neutrino traps and x-ray eyes.
NOBEL PRIZE IN PHYSICSHalf of this year's Nobel Prize in physics went to Ray Davis of the University of Pennsylvania and Masatoshi Koshiba of the University of Tokyo for using neutrinos to gain insight into the cosmos. The other half went to Riccardo Giacconi of Associated Universities Inc. for a 4-decade-long effort to view the universe with x-ray spectacles.
Read more2Tidal interactions and principle of corresponding states: from micro to macro cosmos. A century after van der Waals' Nobel prize
The current attempt is aimed to honor the first centennial of Johannes Diderik van der Waals (VDW) awarding Nobel Prize in Physics. The VDW theory of ordinary fluids is reviewed in the first part of the paper, where special effort is devoted to the equation of state and the law of corresponding states. In addition, a few mathematical features involving properties of cubic equations are discussed, for appreciating the intrinsic beauty of the VDW theory. A theory of astrophysical fluids is shortly reviewed in the second part of the paper, grounding on the tensor virial theorem for two-component systems, and an equation of state is formulated with a convenient choice of reduced variables. Additional effort is devoted to particular choices of density profiles, namely a simple guidance case and two cases of astrophysical interest. The related macroisothermal curves are found to be qualitatively similar to VDW isothermal curves below the critical threshold and, for sufficiently steep density profiles, a critical macroisothermal curve exists, with a single horizontal inflexion point. Under the working hypothesis of a phase transition (assumed to be gas-stars) for astrophysical fluids, similar to the vapour-liquid phase transition in ordinary fluids, the location of gas clouds, stellar systems, galaxies, cluster of galaxies, on the plane scanned by reduced variables, is tentatively assigned. A brief discussion shows how van der Waals' two great discoveries, namely a gas equation of state where tidal interactions between molecules are taken into account, and the law of corresponding states, related to microcosmos, find a counterpart with regard to macrocosmos. In conclusion, after more than a century since the awarding of the Nobel Prize in Physics, van der Waals' ideas are still valid and helpful to day for a full understanding of the universe.
Read more4Kai Manne Börje Siegbahn
Kai Manne Börje Siegbahn
7Arrhenius, the Atomic Hypothesis, and the 1908 Nobel Prizes in Physics and Chemistry
Previous articleNext article No AccessArrhenius, the Atomic Hypothesis, and the 1908 Nobel Prizes in Physics and ChemistryElisabeth CrawfordElisabeth Crawford Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmail SectionsMoreDetailsFiguresReferencesCited by Isis Volume 75, Number 3Sep., 1984 Publication of the History of Science Society Article DOIhttps://doi.org/10.1086/353569 Views: 17Total views on this site Citations: 5Citations are reported from Crossref Copyright 1984 History of Science Society, Inc.PDF download Crossref reports the following articles citing this article:Felipe de Moura Souza, Eliana Maria Aricó Teorias ácido‐base no século XX e uma análise reflexiva do trabalho científico, Educación Química 28, no.44 (Oct 2017): 211–216.https://doi.org/10.1016/j.eq.2017.07.002Benoît Lelong La grandeur de Richardson, Terrains & travaux n° 18, no.11 (Aug 2011): 19–39.https://doi.org/10.3917/tt.018.0019Diana Kormos Barkan Simply a Matter of Chemistry? The Nobel Prize for 1920, Perspectives on Science 2, no.44 (Feb 1994): 357–395.https://doi.org/10.1162/posc_a_00466Franz Luttenberger Arrhenius vs. Ehrlich on immunochemistry: Decisions about scientific progress in the context of the Nobel prize, Theoretical Medicine 13, no.22 (Jun 1992): 137–173.https://doi.org/10.1007/BF02163626 John Neu One Hundred Tenth Critical Bibliography of the History of Science and Its Cultural Influences, Isis 76, no.55 (Oct 2015): 5–240.https://doi.org/10.1086/354035
Read more1Efficient Access to Space: Implications for Space Astronomy
Space exploration has lasted for about half a century, and astronomical observations with space telescopes and other instruments have allowed us to understand the laws of the nature and the universe itself much deeper, wider and in ever greater detail. For example, many important and ground-breaking new phenomena and astronomical objects have been discovered by space astronomical observations, and two Nobel prizes in physics have been awarded to the results of space astronomical observations. However, access to space still remains very expensive, such that only a very limited number of space astronomical facilities with much contrived capabilities have been sent to space, in comparison to the numerous powerful experiments and observational facilities built on the ground. This certainly hinders our ability to further study the laws of nature and explore the universe.
Read moreO Prêmio Nobel de Física de 2012
In this article we will talk about the 2012 Nobel Prize in Physics, awarded to the physicists, the french man Serge Haroche and the north-american David Geffrey Wineland for ground-breaking experimental methods that enable measuring and manipulation of individual quantum systems.
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