The World of Atom (Part XIII)

Reference: A Logical Approach to Theoretical Physics

PART XIII – NEW PARTICLES AND ATOMIC ACCELERATORS

THE WORLD OF ATOM by Boorse

Chapter 72: The positive Electron – The First Particle of Antimatter (Carl D. Anderson 1905 – 1991)

The Positive Electron. Dirac’s theory implies negative-energy states and the possibility of electrons emerging from these states along with anti-electrons (positrons). Dirac suggested that the chance of such pair being created would be small because it would require energy equivalent to at least twice the mass of electron. However enough energy is present in cosmic radiation to create such a pair as it passes through a sheet of matter. Carl Anderson’s discovery of such pair of particles in his cosmic ray photographs established the Dirac theory as one of the most reliable in physics. This has led to the concept of antimatter.

Chapter 73: The discovery of the Deuteron (Harold Clayton Urey 1893 – 1981)

A Hydrogen Isotope of Mass 2 and its concentration. Fractional distillation of hydrogen to obtain a concentration of deuteron was accomplished by Harold Urey in 1932. This allowed the experimental investigation which resulted in the discovery of neutron soon afterwards.

Chapter 74: Discovery of the Neutron (James Chadwick 1891 – 1974)

The Existence of a Neutron. Scientists faced great difficulty in accounting for the mass and charge of a nucleus in terms of the electron and proton only. Chadwick pictured the beryllium radiation as being not electromagnetic but rather as consisting of neutral particles with masses equal to the mass of the proton. He proved that these particles are highly penetrating because they have no charge and are thus not repelled by the electric fields surrounding nuclei. Neutron and proton are now considered as two different energy states of the same fundamental particle, the nucleon. 

Chapter 75: Fermi’s Contributions (Enrico Fermi 1901 – 1954)

Quanta of a Field as Particles. Fermi-Dirac statistics add the restriction that electrons influence one another in such a way as to pre-empt or exclude identical motion in the same volume element (Pauli’s exclusion principle). Fermi did this to account for degeneracy. This was soon used to explain the properties of metals and to solve all kinds of solid-state problems. Fermi showed how various atomic problems can be treated statistically, to give results that are fairly accurate. Fermi demonstrated the existence of new radioactive elements produced by neutron irradiation. He developed a complete theory of β-decay and β-emission from the nucleus. His neutron research finally culminated in the first self-sustaining nuclear chain reaction on Dec 2, 1942.

Chapter 76: Artificial Nuclear Disintegration (John Cockcroft 1897 – 1967, Ernest Walton 1903 – 1995)

Experiments with High Velocity Positive Ions. Cockcroft and Walton were the first to construct an ion accelerator of sufficient energy to produce nuclear disintegrations.Gamow showed that α-particles, because of their wave nature, do indeed penetrate the Coulomb potential barrier at relatively low energies. Cockcroft became convinced that the wave properties of protons would allow them to enter light nuclei at low energies. Ernest Walton was then developing one of the first linear accelerators. Their collaboration in 1932 resulted in the first proton-induced artificial nuclear disintegration. The results showed that nuclei could be disrupted by particles of lower energy than previously supposed.

Chapter 77: The Electrostatic Generator (Robert Jemison Van De Graaff 1901 – 1967)

The Electrostatic Production of High Voltage for Nuclear Investigations. The Van de Graaff generator was developed as a particle accelerator for physics research; its high potential is used to accelerate subatomic particles to great speeds in an evacuated tube. It was the most powerful type of accelerator of the 1930s until the cyclotron was developed.

Chapter 78: The Cyclotron (Ernest O. Lawrence 1901 – 1958), Milton S. Livingston 1905 – 1986)

Production of High-Speed Ions. Lawrence introduced a new procedure: to accelerate ions to very high speeds in a series of steps, each of which would involve only a relatively small voltage. In a cyclotron, one must first have a magnetic field at right angles to the plane of the path of the ion and then an alternating electric field that changes its direction periodically in phase with motion of the ion.

Chapter 79: The Discovery of Induced Radioactivity (Jean F. Joliot 1900 – 1958, Irene Curie Joliot 1897 – 1956)

A New Type of Radioactivity. The Joliot-Curies showed in 1934 that when lighter elements, such as boron and aluminum, were bombarded with α-particles, the lighter elements continued to emit radiation even after the α−source was removed. They showed that this radiation consisted of positrons. The induced radioactivity appeared because an unstable nucleus had been created. This discovery set off similar research in physics laboratories around the world. 

Chapter 80: Prediction of the Meson (Hideki Yukawa 1907 – 1981)

On the Interaction of Elementary Particles. Hideki Yukawa developed a quantum field theory of the nuclear forces. He quantized the nuclear force field in complete analogy with the electromagnetic radiation field. The interaction between two charged particles is described as arising from the mutual emission and absorption of photons. Yukawa postulated that a much heavier particle is emitted by the neutron and then absorbed by the proton that generates strong interactions between them and thus account for nuclear forces. Later pi mesons (pions) were discovered that have the property predicted by Yukawa.

SUMMARY:

The last aspect of investigation into the electron was the discovery of positron. The target of investigation then became the nucleus. This required the production of high energy particles that could penetrate the nucleus. This led to the invention of cyclotron. The discovery of neutron also provided an effective “missile” that could penetrate the nucleus. Investigation required the understanding the very substance and the force that held it was held together.

POSTULATES:

  1. The substance is palpable, and that palpability comes from force.
  2. The substance exists as a continuum, but it has a spectrum of thickness (viscosity).
  3. When this substance flows with uniform thickness it has wave characteristics.
  4. When that thickness varies with sudden and extreme gradients it acquires particle characteristics.
  5. An isolated particle may be visualized as a discrete solid center surrounded by a continuum of gradually thinning substance swirling around it. This would be the picture of the hydrogen atom.
  6. Any interaction with the surrounding continuum of substance shall produce sharp gradients and appearance of a particle. Such a particle is the electron with no solid center.
  7. Electron can have many energy levels and the change in energy levels is accompanied by the emission or absorption of a photon. Such energy level can be negative, a change from which is accompanied by a positron (an antiparticle).
  8. Different energy levels could be occupied by other electrons making the atomic structure more rigid. This simply means multiple continua of slightly different thicknesses surrounding the nucleus.
  9. Multiple electrons hold their relative configuration by continually exchanging photons among them.
  10. The center of a particle (the solid nucleus) may acquire greater complexity through accumulation as in the case of a Deuteron.
  11. Here too we have many energy levels in the nucleus and they may or may not be occupied by nucleons.
  12. Multiple nucleons in the nucleus hold their relative configuration by continually exchanging pions among them.

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Comments

  • Chris Thompson  On March 25, 2021 at 4:20 PM

    That is certainly a lot of postulates.

    The palpability in Postulate 1 seems like inertia, therefore inertia is not only a “property” of matter but must also be considered a “force” of matter because of its palpability, which is to say “motion.” (To bring forward your earlier assertions about force.)

    Spacetime is by definition “in motion.”

    Maybe.

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