Recent shell model calculations have yielded width amplitude distributions which have apparently not agreed with the Porter-Thomas distribution. This result conflicts with the present experimental evidence. A reanalysis of these calculations suggests that, although correct, they do not imply that the Porter-Thomas distribution will fail to describe the width distributions observed experimentally. The conditions for validity of the Porter-Thomas distribution are discussed.

NUCLEAR STRUCTURE Examine conditions for validity of Porter-Thomas distribution.

An angular distribution and isochromats for the reaction ${}_{}{}^3{}_{}{}^{}\mathrm{He}$(e,d)e'p were measured to determine the importance of $E2\mathrm{}$ strength near the peak of the ${}_{}{}^3{}_{}{}^{}\mathrm{He}(\gamma , \mathrm{d})\mathrm{p}$ cross section. The angular distribution was analyzed using both a complete and approximate virtual photon spectrum. The isochromats were compared to a plane wave model prediction and least squares fitted to determine the relative amounts of $E1\mathrm{}$ and $E2\mathrm{}$ strength.

NUCLEAR REACTIONS Measured $\sigma ({\theta }_{\mathrm{d}}, E_{\mathrm{d}}, E_0)$ obtained $\sigma (E_{\mathrm{d}}, E_0)$, ${\sigma }^{E1\mathrm{}}(\gamma , \mathrm{d})$, and ${\sigma }^{E2\mathrm{}}(\gamma , \mathrm{d})$.

Electromagnetic $M1\mathrm{}$ and $E2\mathrm{}$ transitions in the seven-nucleon systems, the ${}_{}{}^3{}_{}{}^{}\mathrm{He}(\alpha , \gamma ){}_{}{}^7{}_{}{}^{}\mathrm{Be}$ radiative-capture problem, and the electron-capture reaction of ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$ into ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ are studied. The wave functions employed are from a previous single-channel resonating-group calculation which yielded satisfactory results for the ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ +$\alpha$ and ${}_{}{}^3{}_{}{}^{}\mathrm{H}$ +$\alpha$ scattering cross sections and polarizations. With no adjustable parameters, the calculated $B\left(M1\mathrm{}\right)\mathrm{}$ and $B\left(E2\mathrm{}\right)\mathrm{}$ values for transitions between the ground and first excited states of ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ or ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$ are found to agree rather well with values empirically determined. The $B\left(E2\mathrm{}\right)\mathrm{}$ study shows, in particular, that the nuclei ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ and ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$ must have strong collective features, which are describable in terms of $\alpha$ plus three-nucleon clustering. The cross-section factor $S\left(0\right)\mathrm{}$, important in astrophysical considerations, is determined to have a value between 0.5 and 0.6 keV b. For the electron-capture reaction, the calculated value of the branching ratio to the first excited state of ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ is 10.31%, which is in very good agreement with the measured value of 10.36±0.10% reported prior to 1982.

NUCLEAR REACTIONS ${}_{}{}^3{}_{}{}^{}\mathrm{He}(\alpha , \gamma )$, ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$(${\mathrm{e}}^{-}$), ${}_{}{}^7{}_{}{}^{}\mathrm{Li}\left(\gamma \right)$;; calculated capture cross section, $log\mathrm{ft}$, $B\left(M1\mathrm{}\right)\mathrm{}$ and $B\left(E2\mathrm{}\right)\mathrm{}$ with resonating-group wave functions.

Alpha particle spectra from the ${}_{}{}^{25}{}_{}{}^{}\mathrm{Mg}({}_{}{}^3{}_{}{}^{}\mathrm{He}, \alpha ){}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$ reaction at a high incident energy of 130 MeV have been measured in an angular range ${\theta }_{\mathrm{lab}}=7.5\mathrm{}°-37\mathrm{}°$ in 1° steps. The spectra exhibit for the first time a strong clustering of states concentrated in the excitation energy region $6.8\le E_x\le 17.2$ MeV. The experimental angular distribution for this region as well as those for the first four low-lying states ($E_x=0.0, 1.37, \mathrm{and} 4.12+4.24$ MeV) have been extracted and analyzed in terms of the distorted-wave Born approximation theory. Calculations employing unique shallow optical model potentials in the entrance and exit channels as used in the analysis of low energy experiments, with or without introducing radial cutoffs, fail to describe the data. Effects of radial cutoffs are found to be not comparable to those of applying a deep $\alpha$ optical model potential of the Johnson-Soper type. The latter leads to a good description of the data and yields spectroscopic factors in good agreement with those available in the literature.

NUCLEAR REACTIONS ${}_{}{}^{25}{}_{}{}^{}\mathrm{Mg}({}_{}{}^3{}_{}{}^{}\mathrm{He}, \alpha ){}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$, $E=130\mathrm{}$ MeV; measured $\frac{d\sigma \left(\theta \right)}{d\Omega }$. Enriched target; DWBA analysis; discussed reaction mechanism; extracted spectroscopic factors.

The ($d$, ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$) reaction on ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}$ and ${}_{}{}^{34}{}_{}{}^{}\mathrm{S}$ has been measured at a bombarding energy of 80 MeV. Angular distributions for the low lying states were obtained in an angular range of 9° to 45° laboratory. Alpha spectroscopic factors were extracted employing finite-range distorted-wave Born approximation calculations. The results are discussed in comparison to recent shell-model predictions.

NUCLEAR REACTIONS ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}(d, {}_{}{}^6{}_{}{}^{}\mathrm{Li}){}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{34}{}_{}{}^{}\mathrm{S}(d, {}_{}{}^6{}_{}{}^{}\mathrm{Li}){}_{}{}^{30}{}_{}{}^{}\mathrm{Si}$; $E_d=80\mathrm{}$ MeV; measured $\sigma (E_{{}_{}{}^6{}_{}{}^{}\mathrm{Li}}, \theta )$; ${\mathrm{H}}_2$S-gas targets, enriched isotopes; finite-range DWBA calculations; deduced alpha spectroscopic factors for low lying levels.

The elastic scattering cross sections for ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ have been measured in the energy ranges 23.5-39 and 25-39 MeV, respectively. These data have been compared with the Mainz total photonuclear absorption cross sections and interpreted in terms of a form factor applied to the gauge term of the Thomson amplitude as well as an E2 amplitude. For ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ the E2 strength found is ${1.9}_{-0.7\mathrm{}}^{+0.8\mathrm{}}$ total, isoscalar plus isovector, energy-weighted sums, and for ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ ${1.25}_{-0.9\mathrm{}}^{+1.3\mathrm{}}$. All of the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ data taken at 23.5 MeV, the peak of the giant resonance, where the real part of the scattering amplitude vanishes, have been combined to determine the total photonuclear absorption cross section at that energy, 19.7±0.4 mb. The branching ratio $\frac{{\Gamma }_{4.4}}{{\Gamma }_0}$ at 23.5 MeV was found to be 0.23±0.07.

NUCLEAR REACTIONS Measured $\frac{d\sigma }{d\Omega (\gamma , \gamma )}$ for ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, $E=20-40\mathrm{}$ MeV, determined $\int \frac{\mathrm{dE}{\sigma }^{E2\mathrm{}}}{E^2}$.

Using sum rules we calculate four energy weighted moments for the ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ electric dipole photoeffect for a Volkov spin-independent potential with Serber exchange. Our results are ${\sigma }_{-1\mathrm{}}=2.83\mathrm{}$ mb, ${\sigma }_0=119\mathrm{}$ MeV mb, ${\sigma }_1=5430\mathrm{}$ Me${\mathrm{V}}^2$ mb, and ${\sigma }_2=2.76\mathrm{}\times {10}^5$ Me${\mathrm{V}}^3$ mb. We use only the first term in the hyperspherical expansions of the potential and wave function. We invert either two, three, or four of these moments to determine the photoeffect cross section. Results with different numbers of moments agree with each other to about 15%. We find reasonable agreement with measurements of the total photoeffect cross section.

NUCLEAR REACTIONS Photodisintegration of ${}_{}{}^4{}_{}{}^{}\mathrm{He}$, moments of photoeffect, hyperspherical harmonics.

The quasifree scattering process ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}(e, e^{\prime }p){}_{}{}^{11}{}_{}{}^{}\mathrm{B}$ is investigated in the distorted wave impulse approximation using the effective Hamiltonian of McVoy and Van Hove. The off-energy-shell effects are correctly taken into account by replacing the momentum of the proton by the gradient operator $\overrightarrow{\nabla }$. The influence of the spin-orbit coupling in the final state interaction and the nuclear deformation has also been studied. The results indicate that the effect of the gradient operator is to decrease the cross section over a wide range of momentum and to shift the peak of the cross section towards the higher momentum region. It is found that the spin-orbit interaction affects only the maxima and minima of the cross section. The deformed oblate potential of Nilsson with $N$ and $N+2\mathrm{}$ coupling for the bound state wave function is found to improve the agreement of the cross section with the experimental data.

NUCLEAR REACTIONS Quasifree electron scattering from ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, distorted wave impulse approximation, off-shell effects, gradient operator for the proton, nuclear deformation, oblate deformed Nilsson wave function.

The (p,t) reaction has been used to study the closed-shell nuclei ${}_{}{}^{146}{}_{}{}^{}\mathrm{Gd}$ and ${}_{}{}^{144}{}_{}{}^{}\mathrm{Sm}$, the former exhibiting some characteristics of a doubly closed shell. Exotic radioactive targets of ${}_{}{}^{148}{}_{}{}^{}\mathrm{Gd}$ ($t_{\frac{1}{2}}=75\mathrm{}$ yr) and ${}_{}{}^{146}{}_{}{}^{}\mathrm{Sm}$ ($t_{\frac{1}{2}}=7\mathrm{}\times {10}^7$ yr) obtained from chemical and isotope separation of irradiated beam-stop material were employed. The ground-state mass excess of ${}_{}{}^{146}{}_{}{}^{}\mathrm{Gd}$ was measured as being $\Delta u=-76.083\mathrm{}\left(15\right)\mathrm{}$ MeV and the first excited state is confirmed as being a $3^{-}$ state at 1.580-MeV excitation energy. Thirteen states were observed in ${}_{}{}^{146}{}_{}{}^{}\mathrm{Gd}$ and 23 in ${}_{}{}^{144}{}_{}{}^{}\mathrm{Sm}$. The pairing-monopole and pairing-quadrupole states in both nuclei are observed for the first time. These levels are higher than systematics would predict, confirming a proton-subshell closure in ${}_{}{}^{146}{}_{}{}^{}\mathrm{Gd}$, and are split in ${}_{}{}^{144}{}_{}{}^{}\mathrm{Sm}$, indicating a strong interaction between nuclear modes.

NUCLEAR REACTIONS ${}_{}{}^{148}{}_{}{}^{}\mathrm{Gd}$(p,t)${}_{}{}^{146}{}_{}{}^{}\mathrm{Gd}$ and ${}_{}{}^{146}{}_{}{}^{}\mathrm{Sm}$(p,t)${}_{}{}^{144}{}_{}{}^{}\mathrm{Sm}$ with isotopically enriched targets. $E_{\mathrm{p}}=25\mathrm{}$ MeV; measured $E_{\mathrm{t}}$ and $\sigma \left(\theta \right)$ with Q3D spectrometer; DWBA analysis; deduced levels $J^{\pi }$.

NUCLEAR STRUCTURE Identified pairing monopole and quadrupole vibrations in ${}_{}{}^{146}{}_{}{}^{}\mathrm{Gd}$ and ${}_{}{}^{144}{}_{}{}^{}\mathrm{Sm}$. Observed deviations from systematics of $N=82\mathrm{}$ nuclei and mixing of both the monopole and quadrupole pairing vibrations in ${}_{}{}^{144}{}_{}{}^{}\mathrm{Sm}$.

The influence of the clustering and charge-form-factor behavior of ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ on the properties of the $n$+Li system is investigated. By examining the $n$+${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ cross-section and phase-shift results, it is found that, in the low-energy region, a proper consideration of $n$+${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ cluster correlations in ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ is essential to explain the resonance structure, while in the high-energy region one must adopt in the calculation a ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ internal function which yields the empirical form-factor values over a wide $q^2$ range. Contributions from various nucleon-exchange terms are also studied. Here one finds that the main characteristics of these contributions do not seem to depend sensitively on the detailed nature of the cluster internal function.

NUCLEAR REACTIONS ${}_{}{}^6{}_{}{}^{}\mathrm{Li}(n, n)$. Effects of target clustering and charge form factor. Resonating-group method with three-cluster formulation.

Medium energy elastic proton scattering is analyzed with a microscopically generated nonlocal nucleon nucleus optical model. A through discussion is presented on the transition from a nonlocal potential to phase equivalent local potentials. These local potentials reveal a strong repulsive $l$-dependent core which is beyond phenomenological potential models. This core leads to a damping of the diffraction pattern at medium angles and a backward rise of the cross section. These features have been observed experimentally. The formalism is applied to scattering from ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ at low and medium energies and compared to experimental data.

NUCLEAR REACTIONS Microscopic optical potential; ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}(p, p)$, $E=40, 180, 200$ MeV; ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}(p, p)$, $E=160, 180$ MeV; comparison with experimental data.

Measurements have been made of the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}(\alpha , {\alpha }^{\prime }){}_{}{}^{16}{}_{}{}^{}\mathrm{O}_{}^{*}{}_{}{}^{}\left(9.85\mathrm{} \mathrm{MeV}\right)\left({\alpha }_0\right){}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ angular correlation at seven energies between $E_{\alpha }=23.0\mathrm{} \mathrm{and} 27.5$ MeV. The study was undertaken to search for evidence of a $3^{-}$ state which has been predicted to be nearly degenerate with the known $2^{+}$ state at 9.85 MeV excitation in ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$. All of the results indicate that the reaction proceeds entirely through a $2^{+}$ state in ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$. Since there is evidence that the initial stage of the reaction is not selective, the present results argue against the existence of the predicted $3^{-}$ state.

NUCLEAR REACTIONS ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}(\alpha , {\alpha }^{\prime })$, $E_{\alpha }=22.0-27.5\mathrm{}$ MeV, $\theta =170\mathrm{}°$; ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}(\alpha , {\alpha }^{\prime }){}_{}{}^{16}{}_{}{}^{}\mathrm{O}_{}^{*}{}_{}{}^{}\left(9.85\mathrm{} \mathrm{MeV}\right)\left({\alpha }_0\right){}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, $E_{\alpha }=23.0-27.5\mathrm{}$ MeV, $\theta \left({\alpha }^{\prime }\right)=180\mathrm{}°$; measured angular correlation at seven energies; deduced $J^{\pi }$.

The spin and orbital-current contributions to isovector $M1\mathrm{}$ transitions in light nuclei are studied using shell model wave functions. An impressive effect of the orbital magnetization is predicted for ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ and demonstrated by comparing the $M1\mathrm{}$-strength distributions for inelastic electron scattering with the distribution for radiative pion capture and ($p, n$) reactions.

NUCLEAR REACTIONS $M1\mathrm{}$ transitions in ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$, ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}$. Inelastic electron scattering compared with radiative pion capture and charge exchange ($p, n$) at 0°.

The nuclear response to 200-350 MeV electrons inelastically scattered at 20° for six nuclei ranging from $A=9\mathrm{} \mathrm{to} 181$ is given. An excitation energy integral is formed and compared with three theoretical calculations of the total inelastic scattering cross section.

NUCLEAR STRUCTURE $Z(e, e^{\prime })$ with $Z=4, 6, 13, 23, 40, \mathrm{and} 73$, measured $\frac{d^2\sigma }{d\Omega \mathrm{dE}}$ at $\theta =20\mathrm{}°$ vs $E$, determined $S_{\mathrm{inel}}$, compared with model predictions.

The generalized separable expansion method is used to calculate the fully off-energy-shell $t$ matrices from the ${}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{}$ and ${}_{}{}^3{}_{}{}^{}S_1^{}{}_{}{}^{}-{}_{}{}^3{}_{}{}^{}D_1^{}{}_{}{}^{}$ Reid soft-core potentials. It is proved that the bound state is reproduced rigorously by the rank-one approximation. For positive energies, on-shell and half on- (off-) shell scattering amplitudes are reproduced exactly by the generalized separable expansion rank-one and/or, at least, rank-two approximations. The off-shell parts of the $t$ matrices are determined by $N$ fitting parameters which are chosen to minimize the Hilbert-Schmidt norm of the nonseparable term in the rank-$N$ approximation. We obtained a very good off-shell fit for rank-two and rank-three approximations.

NUCLEAR REACTIONS Nucleon-nucleon interactions, new separable expansion method for the ${}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{}$, ${}_{}{}^3{}_{}{}^{}S_1^{}{}_{}{}^{}-{}_{}{}^3{}_{}{}^{}D_1^{}{}_{}{}^{}$ states via the Reid soft-core potentials.

Inelastic electron scattering form factors were measured for the even-parity states of ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$ below 7 MeV. The data span a momentum transfer range of $q\simeq 0.57-2.80$ ${\mathrm{fm}}^{-1\mathrm{}}$. Separate longitudinal and transverse information was obtained, especially for the lowest-energy excitations. For excitations below 3.7 MeV, the longitudinal form factors were found to be well described by shell model calculations provided appropriate effective charges were introduced. These effective charges appear to exhibit little dependence on momentum transfer up to $q\simeq 2$ ${\mathrm{fm}}^{-1\mathrm{}}$. In contrast, effective charges or magnetic moments were not required to account for the corresponding transverse form factors. The shell model was somewhat less successful in its description of the higher-energy excitations, although tentative $J^{\pi }$ assignments were made for some currently ambiguous states on the basis of a comparison with the theoretical predictions.

NUCLEAR REACTIONS ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}(e, e^{\prime })$, $E=60-340\mathrm{}$ MeV, $\theta =90\mathrm{}°, 160°, 180°$; measured $\sigma (E, \theta )$, $\pi =+1\mathrm{}$ levels, $E_x\le 7$ MeV. Shell model theory.

Parity nonconservation in nucleon ($N$)-deuteron$\mathrm{}\left(d\right)\mathrm{}$ scattering is examined at low energies (≤40 MeV), particularly at 15 MeV. A Faddeev treatment is employed. For the strong $N$- force a separable interaction, which fits scattering cross sections up to 60-100 MeV, is used; for the weak parity nonconserving $\mathrm{NN}$ force, an isoscalar short range term due to $\rho$ and $\omega$ exchanges and an isovector pion exchange contribution are included. Comparisons with parity nonconserving experimental asymmetries in $\mathrm{NN}$ scattering are made. For the parity nonconserving asymmetry in $N-d$ scattering the contributions of various terms are separated, so that the model dependence of our results can be discussed. It is found that multiple scattering effects are important. The energy dependence of the parity nonconserving asymmetry in $N-d$ scattering is found to differ qualitatively from that in $\mathrm{NN}$ scattering.

NUCLEAR REACTIONS $d(N, N)d$, calculated total cross section parity nonconserving asymmetry, $E=14-40\mathrm{}$ MeV.

A theory of nuclear reactions and structures is proposed which unifies and generalizes several different approaches, such as the method of coupled reaction channels and the distorted wave Born approximation for rearrangement processes, the method of coupled channels array, the resonating group method, the Feshbach theory for the optical potential, and the multiple scattering formalism for high energy processes. The present theory employs an optical potential which can be systematically improved in a controlled way.

NUCLEAR REACTIONS The resonating group method; the method of coupled reaction channels; antisymmetrized optical potential.

For a given $\alpha \alpha$ potential we show how to calculate in a convenient way the half-off-the-energy-shell cross section ${\sigma }_{\mathrm{half}}$ for $\alpha \alpha$ scattering. We compute ${\sigma }_{\mathrm{half}}$ numerically for energies up to 125 MeV (lab), and make a comparison with the free-scattering cross section. Coulomb effects are included rigorously. In particular, we recall that ${\sigma }_{\mathrm{half}}$ is a discontinuous function of the off-shell-momentum variable at the on-shell value. We confirm that off-shell effects are sizeable, and discuss the relevance for the plane-wave impulse approximation and distorted-wave impulse approximation descriptions of ($\alpha , 2\alpha$) reactions.

NUCLEAR REACTIONS Half-shell scattering, Coulomb potential, impulse approximations, $\alpha +\alpha$ system.

High-resolution transmission and capture measurements of ${}_{}{}^{60}{}_{}{}^{}\mathrm{Ni}$-enriched targets have been made from a few eV to 1800 keV in transmission and from 2.5 keV to 5 MeV in capture. The transmission data from 1 to 452 keV were analyzed with a multilevel $R$-matrix code which uses Bayes' theorem for the fitting process. This code provides the energies and neutron widths of the resonances inside the 1- to 452-keV region as well as a possible parametrization for outside resonances to describe the smooth cross section in this region. The capture data were analyzed from 2.5 to 452 keV with a least-squares fitting code using the Breit-Wigner formula. Average parameters for the 30 observed $s$-wave resonances were deduced. The average level spacing, $D_0$, was found to be equal to 15.2±1.5 keV; the strength function, $S_0$, equal to (2.2±0.6)×${10}^{-4\mathrm{}}$; and the average radiation width, ${\overline{\Gamma }}_{\gamma }$, equal to 1.30±0.07 eV. The staircase plot of the reduced level widths and the plot of the Lorentz-weighted strength function averaged over various energy intervals show possible evidence for doorway states. The level densities calculated with the Fermi-gas model for $l=0\mathrm{}$ and for $l>\mathrm{}0\mathrm{}$ resonances were compared with the cumulative number of observed resonances, but the analysis is not conclusive. The correlation coefficient $\rho$ between ${\Gamma }_n^0$ and ${\Gamma }_{\gamma }$ is equal to 0.53±0.18. The average capture cross section as a function of the neutron incident energy is compared to the tail of the giant electric dipole resonance prediction.

NUCLEAR REACTIONS ${}_{}{}^{60}{}_{}{}^{}\mathrm{Ni}(n, n)$, $E_n=1-452\mathrm{}$ keV; ${}_{}{}^{60}{}_{}{}^{}\mathrm{Ni}(n, \gamma )$, $E_n=2.5-452\mathrm{}$ keV; measured ${\sigma }_{n,\mathrm{tot}}\left(E_n\right)$, ${\sigma }_{n,\gamma }\left(E_n\right)$; deduced ${}_{}{}^{61}{}_{}{}^{}\mathrm{Ni}$ resonance parameters $E_0$, $g{\Gamma }_n$, ${\Gamma }_{\gamma }$, $l$, $J$, and average properties $D_0$, $S_0$, ${\overline{\Gamma }}_{\gamma }$; calculated level density for $l=0\mathrm{}$ and $l>\mathrm{}0\mathrm{}$ resonances and correlation $\rho ({\Gamma }_n^0, {\Gamma }_{\gamma })$.