MEASURING OF A FEW INTEGRAL DATA IN THE SIGMA SIGMA NEUTRON FIELD.

Measurements of absolute reaction rates for certain nonfissionable isotopes were performed at the Institute of Nuclear Power Reactors (IRNE) Romania, using activation detector foils exposed at the center of SIGMA SIGMA . The average microscopic integral cross sections were obtained for the following reactions: **1**9**7Au (n, gamma ), **1**1**5In (n, gamma ), **1**1**5In (n, n prime ), **2**7Al (n, alpha ), **4**6Ti (n, p), **4**7Ti (n, p), **4**8Ti (n, p) and **5**8Ni (n, p). The same data, the absolute reaction rates and the average microscopic integral cross sections, for the principal fissionable isotopes were obtained in the SIGMA SIGMA -1TN facility by means of absolute fission chambers. These average fission cross sections for **2**3**5U, **2**3**9Pu, **2**3**8U, **2**3**7Np, **2**3**2Th, **2**3**3U, **2**4**1Pu were determined.