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Chapter 12: Q44E (page 557)

In the following exercises, two protons are smashed together in an attempt to convert kinetic energy into mass and new particles. Indicate whether the proposed reaction is possible. If not, indicate which rules are violated. Consider only those for charge, angular momentum, and baryon number If the reaction is possible, calculate the minimum kinetic energy required of the colliding protons.

p+p→n+n¯+p+p¯

Short Answer

Expert verified

The resultant answer is not possible.

Step by step solution

01

Given data 

The proposed decay reaction is p+p→n+n¯+p+p¯.

02

Concept of rest energy

A nucleus has mass m . The rest energy can be calculated asmc2 .

03

Calculate conservation of charge

Conservation of charge:

p+p→n+n¯+p+p¯(+e)+(+e)→(0)+(0)+(+e)+(−e)(+2e)→(0)

Thus, the charge before the decay and after the decay are equal, which implies that the charge is not conserved.

Conservation of baryons number:

p+p→n+n¯+p+p¯(+1)+(+1)→(+1)+(−1)+(+1)+(−1)(+2)→(0)

Thus, the baryons number before the decay is not equal to the baryons number after the decay.

From the above results, we conclude that the decay reaction is not possible.

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