Study ofSr88(p,γ)Y

Investigation of65Cu by means of the average resonance proton capture method

“…Recently this method has been examined in proton capture for As, Tc, Y and Zr isotopes as product nuclei [4][5][6][7][8][9]. It has been shown that, when the intensities of the primary gamma rays are summed over many resonances of the compound nucleus, which is formed in low energy proton capture, the variations of the intensities due to nuclear structure effects are damped out.…”

Radiative strength functions for dipole transitions in 90Zr

“…In the present study, the energy distribution of the strength of dipole gamma-transitions in the 90 Zr nucleus is determined in the reaction 89 Y(p, γ f ) 90 Zr from a comparison of the results obtained by measuring, at incidentproton energies in the range between 2.17 and 5.0 MeV [11][12][13][14], and thereupon averaging partial cross sections for this reaction with the radiative strength function dependent cross section calculated for this reaction on the basis of Hauser-Feshbach statistical theory. This method for determining RSF, which is described in more detail in [18], for example, is model-dependent, but the statistical model as such, if justifiably applied, is one of the most precise models for a quantitative analysis of nuclear data.…”

“…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. At the same time, the protonic width must be substantially larger than the mean radiative width.…”

“…The energy difference between the 2p 1/2 and 1g 9/2 orbitals forms the energy gap for protons, which is equal to 2670(90) keV [47], the pairing energy being 3593 (8) keV. The shell-model gap for neutrons is 4445(8) keV, while the pairing energy amounts to 4093 (12) keV. A strong mixing of the π2p 1/2 (up to 59%)and π1g 9/2 (up to 41%) configurations both in the the ground state, whose spin-parity is 0 + 1 , and in the first excited state, whose spin-parity is 0 + 2 , is assumed in this model.…”

“…The objective of the present study is to determine the absolute values and the energy distribution of the strength of dipole transitions in the 90 Zr nucleus in the region of a possible manifestation of resonance-like structures on the basis of already available experimental data on partial and total cross section for the reaction of proton radiative capture [11][12][13][14][15][16].…”