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Regional Basic Professional Training Course in Korea

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❙ 35 ❙<br />

1. Nuclear Reactor Pr<strong>in</strong>ciples<br />

energy. A valley is still observed for 40 MeV helium-ion <strong>in</strong>duced fission of 238<br />

U.<br />

Also, the <strong>in</strong>fluence of the compound mass on the yields distribution was experimentally<br />

established. Indeed, it was observed that when <strong>in</strong>creas<strong>in</strong>g the compound mass, the light<br />

mass peak moves upwards while the heavy mass peak does not change position<br />

significantly. For some very massive compound nuclei the two peaks essentially merge<br />

<strong>in</strong>to a s<strong>in</strong>gle peak. This is illustrated <strong>in</strong> the three follow<strong>in</strong>g graphs taken from JANIS.<br />

FIG. 1.18. Mass yield curve for the thermal neutron fission of Pu-239, Pu-241 and U-233.

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