Which property of nuclear forces is responsible for the constancy of binding energy per nucleon?

Explanation

To answer the question regarding which property of nuclear forces is responsible for the constancy of binding energy per nucleon, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding Binding Energy**:
- Binding energy is defined as the energy required to bind a nucleus together. It is the energy that holds the nucleons (protons and neutrons) within the nucleus.

2. **Definition of Binding Energy per Nucleon**:
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