Nuclear emulsion

In a Particle and Nuclear physics, a nuclear emulsion plate is a photographic plate with a particularly thick emulsion layer and with a very uniform grain size. Like bubble chambers, cloud chambers, and wire chambers nuclear emulsion plates record the tracks of charged particles passing through. They are compact, have high density and produce a cumulative record, but have the disadvantage that the plates must be developed before the tracks can be observed.

Nuclear emulsions can be used to record and investigate fast charged particles like nucleons or mesons. After exposing and developing the plate, single particle tracks can be observed and measured using a microscope. In 1966, Ishfaq Ahmad made further advances in the field, and proposed the inelastic collision of β− between the heavy nuclei and the light-wave interference, using the particle detectors at CERN, can results in heavy absorption of multiple pion in a complex energy-particle.

In 1937, Marietta Blau and Hertha Wambacher discovered nuclear disintegration stars due to spallation in nuclear emulsions that had been exposed to cosmic radiation at a height of 2,300 metres (≈7,500 feet) above sea level.

Using nuclear emulsions exposed on high mountains, Cecil Frank Powell and coworkers discovered the pion in 1947.

References

• J. Thewlis (ed.), Encyclopedic Dictionary of Physics, Pergamon Press, Oxford, 1962
• Robert Rosner, Brigitte Strohmaier (ed.): Marietta Blau, Stars of Disintegration. A biography of a pioneer of modern particle physics. Böhlau, Vienna 2003, ISBN 3205-77088-9 (in German)
• Ishfaq Ahmad (ed.), Absorption of Fast π± Mesons in Nuclear Emulsion , University of Montreal, Canada, 1966.

External links

• Nuclear emulsions by Ilford
• Absorption of Fast ±π Mesons in Nuclear Emulsion by Ishfaq Ahmad, PAEC