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Analysis of Liquid Hydrogen Bubble Chamber

Blanda Tran

Leahra Gould

Bubble Chamber

Charles Thomas Rees Wilson

Luis Alvarez

Donald Glaser

Fermilab Bubble Chamber

Conclusion

o

2

  • X was a neutron
  • neutral particle
  • mass of neutron is 940MeV/c
  • Lifetime of Σ
  • accepted value: 0.149 ns
  • Percent error: 51.6%

How it works

Sources of Error

Results

Experimental Procedure

QUESTIONS?

  • Determine
  • radii of the trails
  • angle between tangent lines of particle tracks

Subatomic Particles

Calculations

  • Produced in high energy collisions
  • Kaons, Sigma particles, Pions, Protons
  • Only protons are stable constituents
  • Beam of one type of particle aimed at target
  • Chain of reactions observed
  • measurements of chord lengths, sagitta
  • picture resolution
  • only one image

References

Elastic Scattering

https://www.aps.org/publications/apsnews/201001/physicshistory.cfm

  • Proton is stable
  • at rest
  • no track
  • Σ is the most unstable
  • lifetime of 10 seconds
  • decays further into other particles

-10

Initial Reaction

-

+

Κ + p Σ + π

Sigma Decay

OR

  • Magnetic field
  • 1.34 T pointing out
  • Right hand rule
  • Length of the trail

OR

  • Unknown particle X
  • Solve for using conservation momentum

How to Identify Events

+

π

-

Κ

-

Κ

-

π

-

Σ

-

Κ

+

Σ

-

π

  • Momentum of each particle
  • Lifetime of Σ
  • Identity of X
  • using conservation laws

o

-

Κ

-

π

+

Σ

o

2

  • Unknown Particle X
  • mass: 943±16 MeV/c
  • Lifetime of Σ
  • 0.226±0.13 ns

-

Κ

-

Σ

-

+

Σ π + X

o

+

π

+

-

Κ + p Σ + π

Collision and scattering of negative kaon and proton

K + p K + p

-

+

π

-

+

Σ π + X

o

+

π

-

π

-

π

-

Σ

+

π

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