Spin distribution factors for formation of metastable states of 90Y and 91Y through (n,p) reactions over neutron energies 5–15 MeV

✍ Scribed by Ranjita Sarkar; Vasant N. Bhoraskar

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 548 KB
• Volume: 633
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(98)00813-6

✦ Synopsis

The variations in the isomer ratio with the spin distribution factor were studied to obtain the cross-sections for formation of metastable states of 9Oy and 91y nuclei formed respectively through 9°Zr(n,p)91ym and 91Zr(n,p)91ym reactions over the neutron energy range 5 to 15 MeV. The theoretical values of the cross-sections could be obtained very close to the respective literature experimental values by varying the spin distribution factor from 1.5 to 2.75. The limiting value of the cross-section was derived from the maximum value of the isomer ratio at that neutron energy, and for this the spin distribution factor was found to vary from 2 to 3.5 over the neutron energies 5 to 15 MeV. Using enriched zirconium targets, cross-sections for formation of 90ym and 91ym nuclei at 14.8 MeV neutron energy were also measured in the laboratory; the values obtained are 17 + 2 mb and 22 4-2 mb respectively for 9Oym and 9lyre. Both these values are close to the corresponding limiting cross-sections at 14 MeV neutron energy. @ 1998 Elsevier Science B.V.