`…………………………..` brings fission in `U^(235)`.

Answer

To answer the question, "What brings fission in U-235?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Fission**: Fission is the process where a heavy nucleus splits into two or more lighter nuclei, along with the release of energy and additional neutrons.

2. **Identifying the Key Particle**: In the case of Uranium-235 (U-235), the process of fission is initiated by the absorption of a specific particle.

3. **Role of Neutrons**: The particle that initiates fission in U-235 is a neutron. When a U-235 nucleus captures a neutron, it becomes unstable and undergoes fission.

4. **Fission Reaction**: Upon fission, U-235 typically splits into two smaller nuclei (such as xenon and strontium), and releases additional neutrons (usually three). This is crucial because these released neutrons can then initiate further fission reactions in other U-235 nuclei, leading to a chain reaction.

5. **Energy Release**: The fission process releases a significant amount of energy, which is harnessed in nuclear reactors and atomic bombs.

### Final Answer:
Neutrons bring fission in U-235.

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