“…The heat of the (p, γ 0 ) reaction on the 89 Y nucleus is 8.3548 (16) MeV; therefore, the compound nucleus formed is excited to the energy of 12.5 MeV at incidentproton energies not exceeding the effective threshold for the opening of the competing neutron channel (through the reaction 89 Y(p, n 1 ) 89 Zr at E p = 4.24 MeV). At this excitation energy, the attained density of states even in this even-even spherical nucleus of 90 Zr, which is magic in the number of neutrons, N = 50, exceeds (see, for example, [20]) 10 4 MeV −1 , which must satisfy the requirements of applicability of a statistical description. On the basis of an analysis of investigations of the (p, n), (p, p), (p, p ′ ), and (p, γ) reactions on the 89 Y nucleus and on neighboring nuclei [11,12,[19][20][21][22][23][24], (γ, γ) and (γ, γ ′ )) reactions on the 90 Zr nucleus [2,25], as well as the (n, γ) reaction on the isotopes neighboring 90 Zr isotope [5,6], one can conclude that the distances between resonance levels having identical spins and parities in the product compound nucleus 90 Zr obey the Wigner distribution, while the protonic and radiative widths follow two independent Porter-Thomas distributions.…”