Two physicists discovered special properties of stable atoms with 'magic numbers' of protons and neutrons 75 years ago
Helium, with two protons and two neutrons, is the lightest "doubly magic" nucleus. Both its neutron count and its proton ...
The Economist8d
The chart of everything
At the bottom of the chart are the fundamental particles—quarks, bosons (eg Higgs, w +, w -, z ), protons, neutrons, ...
PBS13d
Chadwick discovers the neutron
For example, a helium atom has an atomic mass of 4, but an atomic number (or positive charge) of 2. Since electrons have almost no mass, it seemed that something besides the protons in the nucleus ...
Symmetry Magazine18d
Antimatter on wheels
To keep up the magnetic field suspending the protons, the superconducting magnet needs to stay cooled with liquid helium to temperatures as low as 4.2 Kelvin (or minus 445 degrees Fahrenheit), far ...
Many stable atoms have ‘magic numbers’ of protons and neutrons − 75 years ago, 2 physicists discovered their special properties
Helium, with two protons and two neutrons, is the lightest “doubly magic” nucleus. Both its neutron count and its proton ...
PBS2y
Chadwick discovers the neutron
For example, a helium atom has an atomic mass of 4, but an atomic number (or positive charge) of 2. Since electrons have almost no mass, it seemed that something besides the protons in the nucleus ...