1911 · Ernest Rutherford
The Scattering of α and β Particles by Matter and the Structure of the Atom
What this work is
Rutherford's 1911 paper on why a few alpha particles bounce back from thin gold foil. Using counts of flashes on a screen recorded by Geiger and Marsden, he argues that one hard encounter with a tiny, concentrated charge at the center of the atom fits the counts at every angle, where many small deflections could not.
Then and now
Rutherford showed that a formula for one concentrated charge fit the flash counts from gold foil. Physics took it as the discovery of the nucleus and built the modern atom on it. The paper counted specks of light, and nobody has seen a nucleus.
Verdict
UNSCIENTIFIC
The work only partly follows the scientific method inside its paradigm, and the paradigm itself does not pass. The worse layer decides. The verdict is unscientific.
1·This work · inside the paradigm
MIXED
Partly follows the scientific method within Atomic Model / Classical Electrodynamics.
2·Paradigm · Atomic Model / Classical Electrodynamics
UNSCIENTIFIC
Fails the tests. The worse layer decides.
How the verdict is decided
The verdict grades both layers: the paradigm this work assumes, and how the work was carried out inside it. Both must be scientific for the whole thing to be scientific. A clean method inside an unscientific paradigm is unscientific. An unscientific method inside a better paradigm is unscientific. A split on either layer is mixed. The worse layer decides.
1·This work
Did this work test its claim with methods that are independent, falsifiable, and non-circular?
MIXED
This work claims that the atom holds a tiny, intensely charged center, because about one alpha particle in 20,000 bounces straight back from a thin gold foil in a single encounter. The tests split.
Independently Verifiable
Fail
The record is a person counting flashes on a screen at set angles; the central charge appears only when the orbit math turns those counts into one.
Falsifiable
Pass
The formula fixed the flash count at every angle in advance, and Thomson's rival many-nudge law predicted a different spread, so the data could have gone the other way and Rutherford treated that alternative as live.
Non-Circular
Pass
The glowing screen and the counted flashes were not built from the nuclear claim, and the formula was written to face counts that never assumed a nucleus.
Why
The record is flashes counted on a screen, and the central charge exists only where the orbit math turns those counts into one. The formula fixed the count at every angle in advance, and Thomson's rival model predicted a different spread, so the data could have gone the other way. The screen and the counts were not built from the nuclear claim.
2·Paradigm · Atomic Model / Classical Electrodynamics
Does the framework this work assumes pass the three tests?
UNSCIENTIFIC
Independently Verifiable
Fail
A speck of light on a screen is visible to anyone; that the speck is a particle bent by a concentrated charge is the model reading its own record.
Falsifiable
Fail
When Rutherford's atom refused to collapse as classical physics demanded, the field kept the atom and rewrote the physics around it, so no result could count against the atom.
Non-Circular
Fail
The paradigm names the particle as whatever makes the screen flash and the electroscope discharge, then reads those same flashes and discharges as proof the particle is there.
Why
In this paper a stranger can watch a speck of light appear on a screen and a person counting it. The model supplies everything else: the speck is a particle, the particle carries a charge, a concentrated centre bent it, and the pattern of counts measures that centre. The framework cannot lose. Classical electrodynamics said the orbiting particles in Rutherford's atom should radiate away their energy and spiral inward almost instantly, and atoms plainly persist. The field did not drop the atom. Bohr invented fixed orbits to save it, and every later failure was handled the same way, by revising the mechanics while the atom and its nucleus stayed untouched. The entity is protected by the willingness to change everything except itself.
From the work
They found, for example, that a small fraction of the incident a particles, about 1 in 20,000, were turned through an average anffle of 90 ~ in passln~ through a layer of gold-foil about "0000~ cm. thick
the number of scintilla~ibns appearing on a constant area of a zinc sulphide screen are counted for different angles with the direction of incidence of the particles
A simple calculation shows that the atom must be a seat of an intense electric field in order to produce such a large deflexion at a single encounter.
It will be remembered that the values of N for gold deduced fi'om scattering of the a rays were in two calcula- tions 97 and 114.