Measurement of the Neutron Activation Cross Sections of ¹²C, ³⁰Si, ⁴⁷Ti, ⁴⁸Ti, ⁵²Cr, ⁵⁹Co, and ⁵⁸Ni Between 15 and 40 MeV

Neutron activation cross sections between 15 and 40 MeV were measured by the activation method using a monoenergetic neutron field based on the ⁷Li(p,n)⁷Be reaction. Natural samples of carbon and cobalt, and separated isotope samples of ³⁰Si, ⁴⁷Ti, ⁴⁸Ti, ⁵²Cr and ⁵⁸Ni were irradiated in the p-Li neutron fields generated by 20, 25, 30, 35, and 40 MeV protons. Neutron yields were determined from the amount of ⁷Be induced in the lithium target. The amount of ⁷Be was measured by observing the 0.478-MeV gamma rays of ⁷Be(T_1/2 = 53.29 days) after the irradiation experiment. Cross sections of ¹²C(n,2n)¹¹C, ³⁰Si(n,np)²⁹Al, ⁴⁷Ti(n,np)^46m+gSc, ⁴⁸Ti(n,np)⁴⁷Sc, ⁵²Cr(n,2n)⁵¹Cr, ⁵⁹Co(n,2n)^58m+gCo, ⁵⁹Co(n,3n)⁵⁷Co, ⁵⁹Co(n,4n)⁵⁶Co, and ⁵⁸Ni(n,2n)⁵⁷Ni are reported.