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*“A ***barn** (symbol **b**) is a unit of area. Originally used in nuclear physics for expressing the cross sectional area of nuclei and nuclear reactions, today it is also used in all fields of high-energy physics to express the cross sections of any scattering process, and is best understood as a measure of the probability of interaction between small particles. A barn is defined as 10^{−28} m^{2} and is approximately the cross-sectional area of a uranium nucleus.” – Wikipedia

The cross-section of the uranium nucleus (1 barn) is and **femto** means , a thousandth of a millionth of a millionth. So a femtobarn is .

The **inverse femtobarn** gives you an estimate number of particle collision events per femtobarn. **1 inverse femtobarn** corresponds to approximately **100** **trillion** () proton-proton collisions.

In 2015, the LHC collider at CERN delivered over **4 inverse femtobarns **worth of proton-proton collisions to the experiments.

LHC is expected to deliver **25 inverse femtobarns** in the next 6 months.

In the future, LHC will be capable of delivering **300 inverse femtobarns** per year.

I will conclude by linking to Adam Falkowski’s comments on the inverse femtobarn.

http://resonaances.blogspot.com/2010/02/how-much-is-one-inverse-femtobarn.html

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## About Suresh Emre

I have worked as a physicist at the Fermi National Accelerator Laboratory and the Superconducting Super Collider Laboratory. I am a volunteer for the Renaissance Universal movement. My main goal is to inspire the reader to engage in Self-discovery and expansion of consciousness.