A search for neutron emission from spontaneous fission of ${}_{}{}^{252}{}_{}{}^{}\mathrm{Cf}$ in the time range ${10}^{-15\mathrm{}}$-${10}^{-8\mathrm{}}$ s has been made by a method based upon the solid angle aberration. No positive evidence for neutron emission in this time range has been found, but an upper limit for the relative intensity of a single long-lived component as a function of its mean lifetime has been set. It is concluded that very few if any neutrons are emitted with mean lifetimes longer than ${10}^{-13\mathrm{}}$ s, but possibly there is a sizable fraction with a mean lifetime in the ${10}^{-14\mathrm{}}$ s range. A competition between neutron and $\gamma$-ray emission can therefore possibly take place in the time region ${10}^{-14\mathrm{}}$-${10}^{-13\mathrm{}}$ s after fission, as can be expected at excitation energies near the yrast levels.

RADIOACTIVITY ${}_{}{}^{252}{}_{}{}^{}\mathrm{Cf}$ (sf); measured upper limit of $I_n$ ($t={10}^{-15\mathrm{}}-{10}^{-8\mathrm{}}$ s).

We have measured the mass-yield distribution from the fission of ${}_{}{}^{240}{}_{}{}^{}\mathrm{Pu}$ induced by 14.8-MeV neutrons. Seventy-five fission products from ${}_{}{}^{66}{}_{}{}^{}\mathrm{Ni}$ to ${}_{}{}^{169}{}_{}{}^{}\mathrm{Er}$ were detected. From these measurements we obtained the total chain yields for 49 mass numbers and constructed the mass-yield curve. Absolute fission yields were obtained by using the ${}_{}{}^{238}{}_{}{}^{}\mathrm{U}\mathrm{}(n,f)\mathrm{}$ monitor reaction. The total yield determined from each half of the mass-yield curve is 0.984. From the agreement in these two methods we conclude that our yield determination is accurate to approximately 4%. The peak-to-valley ratio is 5.5, a significantly larger value than the ratio of 4.1 found for 14.8-MeV neutron fission of ${}_{}{}^{239}{}_{}{}^{}\mathrm{Pu}$. This difference agrees with the trend noted previously for 14.8-MeV neutron fission of uranium isotopes. A number of independent fission yields were measured. Values of $Z_p$ inferred from these yields agree with those estimated from independent-yield systematics, but are approximately 0.1 charge unit greater than predicted. Several partial isomer yields and isomer ratios were measured. These results provide additional information about the fractional production of isomeric states either directly from fission or from $\beta$ decay. The absolute photon intensity for the 342-keV transition in the decay of ${}_{}{}^{111}{}_{}{}^{}\mathrm{Ag}_{}^g{}_{}{}^{}$ was measured to be 0.0668(±5%).

NUCLEAR REACTIONS, FISSION ${}_{}{}^{240}{}_{}{}^{}\mathrm{Pu}\mathrm{}(n,f)\mathrm{}$, $E=14.8\mathrm{}$ MeV; measured fission yields, deduced fission mass distribution. Measured independent fission yields and partial isomeric yields. ${}_{}{}^{111}{}_{}{}^{}\mathrm{Ag}_{}^g{}_{}{}^{}$ measured $I_{\gamma }$.

The excitation function and lifetime $T_i=(45\mathrm{}\pm 5)$ ns of a ${}_{}{}^{237}{}_{}{}^{}\mathrm{Np}$ fission isomer were measured using the ${}_{}{}^{238}{}_{}{}^{}\mathrm{U}\mathrm{}(p,2n)\mathrm{}$ reaction and the fission-in-flight method. The analysis of the delayed-to-prompt fission ratio provided an excitation energy of (2.85 ± 0.4) MeV for the isomeric state and a branching ratio of 1.9 × ${10}^{-3\mathrm{}}$ between $\gamma$ and fission decays.

NUCLEAR REACTIONS ${}_{}{}^{238}{}_{}{}^{}\mathrm{U}\mathrm{}(p,2n)\mathrm{}$; $E_p=9.75, 11.6, 12.5$ MeV. Measured ${}_{}{}^{237}{}_{}{}^{}\mathrm{Np}_{}^m{}_{}{}^{}$ isomeric decay curve and delayed-to-prompt fission ratios. Deduced partial half-lives $T_{\mathrm{if}}$, $T_{i\gamma }$ and the branching ratio.

We investigate the single-scattering optical potential in the multiple scattering approaches of Watson and of Kerman, McManus, and Thaler. Since the kinematics of single scattering is three body in nature, we build a three-body model of this term. This approach can include the proper kinematics for the struck nucleon, the identity of the target nucleons, and the binding interaction of the struck nucleon. Integral equations of the Faddeev type are derived for both the Watson and Kerman-McManus-Thaler single-scattering optical potentials. Unitarity relations are investigated and we observe that these relations can be expanded in order to identify the intermediate states responsible for the absorptive parts. The transition amplitudes to the inelastic states implicit in the model are extracted and evaluated. This permits one to understand the physical meaning of the imaginary part in precise terms. The same procedure is applied to the closure and impulse approximations for the single-scattering term and their implicit inelastic states and reaction amplitudes are identified. These approximations are evaluated by analyzing the inelastic data. We conclude that the impulse approximation to the Watson single-scattering term should provide the best two-body approximation to a single-scattering optical potential.

NUCLEAR REACTIONS Study optical potential in Watson and KMT multiple-scattering theory, three-body model introduced, Faddeev equations derived, unitarity studied; applied to intermediate energy nucleon-nucleus scattering.

X-ray transition energies of antiprotonic atoms formed in targets of ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$, ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$, C, Si, P, Fe, Y, Zr, Cs, and Yb have been measured. Level shifts and widths due to the strong interaction were determined. A phenomenological fit to the data using an optical-model potential proportional to the nuclear matter density and to an effective $\overline{p}$-nucleus $s$-wave scattering length yielded [$(0.85\mathrm{}\pm 0.38)+i(2.66\pm 0.28)$] fm for the effective scattering length. In addition, the mass of the antiproton was determined to be 938.229 ± 0.049 MeV from the observed energies of the $\overline{p}$ x-ray transitions unperturbed by the strong interaction.

NUCLEAR REACTIONS, hadronic atoms. Measured antiprotonic atom x-ray transition energies; determined strong interaction shifts and widths; deduced effective scattering length; deduced antiproton mass.

We compare detailed dynamical calculations of pion-${}_{}{}^4{}_{}{}^{}\mathrm{He}$ elastic scattering with calculations carried out in the fixed-scatterer approximation. We consider pion (laboratory) energies of 51 to 260 MeV. The dynamical calculations are (essentially) parameter free and provide an excellent fit to the data. It is shown that by introducing an energy shift parameter into the fixed-scatterer approximation calculations it is possible to obtain good agreement with the data at low energies. At the higher energies (180-260 MeV) the quality of the (energy shifted) fixed-scatterer approximation fits to the data become systematically worse, with good agreement only at small angles. These results indicate that the use of a single parameter (an energy shift) in the fixed-scatterer approximation calculations is unable to simulate the effects of nuclear binding and Fermi motion. These effects are treated in detail in the dynamical calculations.

NUCLEAR REACTIONS Pion-helium elastic scattering (50-260 MeV), fixed-scatterer approximation, role of Fermi motion.

Photoproduction of low energy neutral pions from a single nucleon and a deuteron target is examined in detail. Features of a direct and two-step nuclear production mode are discussed for the deuteron and estimates for correction terms are given.

NUCLEAR REACTIONS ($\gamma ,{\pi }^0$), proton and ${}_{}{}^2{}_{}{}^{}\mathrm{H}$ targets; calculated total and differential cross section from 0 to 6 MeV above threshold.

A method is presented to extend the calculations of McVoy and Bander to determine the low-energy neutron-neutron scattering parameters from the spectrum of the reaction ${\pi }^{-}+d\to 2n+\gamma$. The transition amplitude for the capture reaction is derived in the impulse approximation and is related to 12 rotationally invariant amplitudes. The final-state interactions between the two neutrons are treated by means of dispersion relations and a closed-form exact solution is obtained in the effective range approximation and for different Bargmann parametrizations of the ${}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{}$ neutron-neutron phase shift. A theoretical uncertainty of less than 0.3 fm is expected in the scattering length.

NUCLEAR REACTIONS ${\pi }^{-}+d\to 2n+\gamma$, exact dispersive treatment of ${}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{}$ final-state interactions, deuteron wave function. Variation of phase shifts.

Absolute yields of 18 products with $65\le A\le 76$ have been measured for the interaction of 720-MeV $\alpha$ particles with enriched ${}_{}{}^{92}{}_{}{}^{}\mathrm{Mo}$, ${}_{}{}^{96}{}_{}{}^{}\mathrm{Mo}$, and ${}_{}{}^{100}{}_{}{}^{}\mathrm{Mo}$. Isobaric yield (charge dispersion) curves have been constructed for $A=72\mathrm{}$ to examine the effect of target neutron-to-proton composition on spallation product formation. Results indicate that isobaric yield curve peak positions are moderately dependent and asymmetric shapes strongly dependent on target $\frac{N}{Z}$, the latter particularly so for neutron-richer products. Comparisons with proton results and empirical predictions are presented.

NUCLEAR REACTIONS ${}_{}{}^{92,96,100}{}_{}{}^{}\mathrm{Mo}(\alpha ,\mathrm{spallation})$, $E_{\alpha }=720\mathrm{}$ MeV; cross sections for 18 products $65\le A\le 76$; constructed isobaric yield curves at $A=72\mathrm{}$. Enriched targets, Ge(Li) detectors, radiochemistry.

We derive a formula that relates the two-body off-energy-shell $T$ matrix between the center of mass frame and an arbitrary frame by applying the concept of unitarity in relativistic potential theory. We discuss first the case of spinless particles, and then generalize our result to particles with spin.

NUCLEAR REACTIONS Formula to relate the off-energy-shell $T$ matrix between two different reference frames.

We present an analysis of the processes ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}\left({}_{}{}^{14}{}_{}{}^{}\mathrm{O}\right)\to {}_{}{}^{14}{}_{}{}^{}\mathrm{N}+e^{-}\left(e^{+}\right)+{\overline{\nu }}_e\left({\nu }_e\right)$ and ${\mu }^{-}+{}_{}{}^{14}{}_{}{}^{}\mathrm{N}\to {\nu }_{\mu }+{}_{}{}^{14}{}_{}{}^{}\mathrm{C}$ (ground state) on the basis of an "elementary particle" treatment and of a "microscopic" treatment including the nucleons-only impulse approximation and the meson exchange. The elementary particle treatment in conjunction with data on $e^{-}+{}_{}{}^{14}{}_{}{}^{}\mathrm{N}\to e^{-}+{}_{}{}^{14}{}_{}{}^{}\mathrm{N}_{}^{*}{}_{}{}^{}$ (2.31 MeV), conserved vector current, partially conserved axialvector current, and a possible second-class axial current, yields $50 invsec <{\left[\Gamma \right({\mu }^{-}+{}_{}{}^{14}{}_{}{}^{}\mathrm{N}\to {\nu }_{\mu }+{}_{}{}^{14}{}_{}{}^{}\mathrm{C} \left(\mathrm{ground}\mathrm{state}\right)\left)\right]}_{\mathrm{stat}.\mathrm{av}.\mathrm{}}<70\mathrm{} invsec$ and $95 invsec <{\left[\Gamma \right({\mu }^{-}+{}_{}{}^{14}{}_{}{}^{}\mathrm{N}\to {\nu }_{\mu }+{}_{}{}^{14}{}_{}{}^{}\mathrm{C} \left(\mathrm{ground}\mathrm{state}\right)\left)\right]}_{F=\frac{1}{2}}<210\mathrm{} invsec$. The microscopic treatment leads to the conclusion that the nucleons-only-impulse-approximation and meson-exchange contributions to the ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}\left({}_{}{}^{14}{}_{}{}^{}\mathrm{O}\right)\to {}_{}{}^{14}{}_{}{}^{}\mathrm{N}+e^{-}\left(e^{+}\right)+{\overline{\nu }}_e\left({\nu }_e\right)$ amplitude may well be opposite in sign and comparable in magnitude so that the destructive interference between them contributes significantly to the anomalously small values of $\Gamma \left({}_{}{}^{14}{}_{}{}^{}\mathrm{C}\right({}_{}{}^{14}{}_{}{}^{}\mathrm{O})\to {}_{}{}^{14}{}_{}{}^{}\mathrm{N}+e^{-}(e^{+})+{\overline{\nu }}_e({\nu }_e\left)\right)$ and ${\left[\Gamma \right({\mu }^{-}+{}_{}{}^{14}{}_{}{}^{}\mathrm{N}\to {\nu }_{\mu }+{}_{}{}^{14}{}_{}{}^{}\mathrm{C} \left(\mathrm{ground}\mathrm{state}\right)\left)\right]}_{\mathrm{stat}.\mathrm{av}.\mathrm{},F=\frac{1}{2}}$.

RADIOACTIVITY ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}\to {}_{}{}^{14}{}_{}{}^{}\mathrm{N}+e^{-}+{\overline{\nu }}_e$, ${}_{}{}^{14}{}_{}{}^{}\mathrm{O}\to {}_{}{}^{14}{}_{}{}^{}\mathrm{N}+e^{+}+{\nu }_e$, ${\mu }^{-}+{}_{}{}^{14}{}_{}{}^{}\mathrm{N}\to {\nu }_{\mu }+{}_{}{}^{14}{}_{}{}^{}\mathrm{C}$ (ground state), theoretical analysis via "elementary particle" and "microscopic" treatments.

Details of the identification of ${}_{}{}^{186}{}_{}{}^{}\mathrm{Tl}$ and its decay to ${}_{}{}^{186}{}_{}{}^{}\mathrm{Hg}$ as investigated with an isotope separator are presented. Conversion electrons, $\gamma$, $\gamma -\gamma$, and $e-\gamma$ studies establish two bands in ${}_{}{}^{186}{}_{}{}^{}\mathrm{Hg}$; one built on a near-spherical ground state and one on a more strongly deformed shape with a band head at 522 keV. The levels are discussed in the framework of recent theoretical calculations.

RADIOACTIVITY ${}_{}{}^{186}{}_{}{}^{}\mathrm{Tl}$, ${}_{}{}^{186}{}_{}{}^{}\mathrm{Tl}_{}^m{}_{}{}^{}$ from ${}_{}{}^{181}{}_{}{}^{}\mathrm{Ta}({}_{}{}^{16}{}_{}{}^{}\mathrm{O},11n)$, $E=145\mathrm{}$ MeV; ${}_{}{}^{182}{}_{}{}^{}\mathrm{W}({}_{}{}^{14}{}_{}{}^{}\mathrm{N},10n)$, $E=168\mathrm{}$ MeV; mass separated radioactivities. Measured $T_{\frac{1}{2}}$, $E_{\gamma }$, $E_{\mathrm{ce}}$, $I_{\gamma }$, $I_{\mathrm{ce}}$, $\gamma \gamma$ coin, $e\gamma$ coin, ICC, ${}_{}{}^{186}{}_{}{}^{}\mathrm{Hg}$ deduced levels, $I$, $\pi$, multipolarities.

Gamma-gamma directional correlation studies with two Ge (Li) detectors were performed on transitions in ${}_{}{}^{156}{}_{}{}^{}\mathrm{Gd}$ from the decay of ${}_{}{}^{156}{}_{}{}^{}\mathrm{Eu}$. Seventeen correlations were measured including four one-three correlations. The $2^{+}-2_g^{+}$ transitions from $K^{\pi }=0^{+}$ states at 1129 and 1258 keV have strikingly different $E2\mathrm{}$ admixtures of >99.7% and ${12.6}_{-2.8\mathrm{}}^{+3.6\mathrm{}}$, respectively. The results for other one-two correlations are $(E\gamma ,I_i,\% \mathrm{admixture}\mathrm{of}\mathrm{the}\mathrm{first}\mathrm{transition}):(1065,2\mathrm{}\gamma ,E2={99.7}_{-0.5\mathrm{}}^{+0.3\mathrm{}}),(1154,1,M2={0.01}_{-0.01\mathrm{}}^{+0.08\mathrm{}}),(1231,2,M2<0.18),(1277,1,M2<0.06), (1857,1,\sigma 1>92.7), (1877,1,E2={9.3}_{-2.5\mathrm{}}^{+2.7\mathrm{}}), (1938,1,E2=28\mathrm{}\pm 2), (2098,1,E2={68}_{-8\mathrm{}}^{+9\mathrm{}}), \mathrm{and} (2181,1,E2={30}_{-4\mathrm{}}^{+5\mathrm{}})$. For the one-three correlations one obtains $(E\gamma ,I_i-I,\% \mathrm{admixture}\mathrm{of}\mathrm{the}\mathrm{first}\mathrm{transition}):(812,1\mathrm{}-2,E2={0.57}_{-0.32\mathrm{}}^{+0.42\mathrm{}}),(867,1\mathrm{}-2,M2<7.2),(944,1-1,M2<3.8), \mathrm{and} (970,2\mathrm{}-4,E2>98.6)$. The experimental branching ratios for the 1258 keV second $K^{\pi }I=0^{+}2$ state are in marked disagreement with the Bohr-Mottleson predictions after corrections for the 80% $M1\mathrm{}$ admixture in the 2-2 transition. The results of this work and those of previous works have been compared and the averaged results are reported in the text.

RADIOACTIVITY ${}_{}{}^{156}{}_{}{}^{}\mathrm{Gd}$; measured $\gamma -\gamma \left(\theta \right)$; deduced $\delta$, $B\left(E2\mathrm{}\right)\mathrm{}$ ratios.

The $\gamma -\gamma \left(\theta \right)$ measurements of the ${5/2}^{+}$ (360.3 keV) ${7/2}^{+}$ (57.6 keV) ${5/2}^{+}$ cascade in ${}_{}{}^{127}{}_{}{}^{}\mathrm{I}$ have been performed with a NaI-Ge(Li) detector system using a ${}_{}{}^{127}{}_{}{}^{}\mathrm{Te}_{}^{m+g}{}_{}{}^{}$ source in a highly diluted HCl solution. The expansion coefficients obtained are $A_2=0.38\mathrm{}\pm 0.02$ and $A_4=0.03\mathrm{}\pm 0.04$. Using another ${}_{}{}^{127}{}_{}{}^{}\mathrm{Te}_{}^{m+g}{}_{}{}^{}$ source in a concentrated HCl solution, a time differential correlation measurement on the same cascade revealed the presence of a time dependent electric quadrupole perturbation. From the plot of $A_2\left(\overline{t}\right)$ vs $t$, the relaxation parameter ${\lambda }_2^{\mathrm{el}}=(0.22\mathrm{}\pm 0.06)\times {10}^9$ ${\sec }^{-1\mathrm{}}$ and the unperturbed $A_2\mathrm{}\left(0\right)=0.41\mathrm{}\pm 0.05$ is obtained. The observed ${\lambda }_2^{\mathrm{el}}$ is consistent with that deduced from the theory of Abragam and Pound. Also using our $A_2\mathrm{}\left(0\right)\mathrm{}$, a $\delta \left(\frac{E2\mathrm{}}{M1\mathrm{}}\right)$ of 0.33 ± 0.09 is obtained for the 360.3 keV transition.

RADIOACTIVITY ${}_{}{}^{127}{}_{}{}^{}\mathrm{Te}_{}^{m+g}{}_{}{}^{}$ [from ${}_{}{}^{126}{}_{}{}^{}\mathrm{Te}(n,\gamma )$]: measured $\gamma -\gamma \left(\theta \right)$, $\gamma -\gamma (\theta ,t)$; deduced ${\lambda }_2^{\mathrm{el}}$, $A_2\mathrm{}\left(0\right)\mathrm{}$, $G_2\left(\infty \right)$, $\delta \left(360.3\mathrm{}\gamma \right)$.

The yrast traps in ${}_{72}{}^{176}{}_{}{}^{}\mathrm{Hf}_{104}^{}{}_{}{}^{}$ with angular momenta $J=K=14\mathrm{} \mathrm{to} 22$ are studied in a cranked Hartree-Fock-Bogoliubov approach with particle number projection before the variation of the important degrees of freedom. It is shown that the bands formed on the $J=K$ bandheads corresponding to rotation around the prolate symmetry axis intersect the ground state rotational band ($K=0\mathrm{}$) to form these yrast traps. The main reason for the low energy of the $K=J$ bandheads is the concentration of Nilsson levels with a large angular momentum projection $\Omega$ on the symmetry axis near the Fermi surface in this nucleus.

NUCLEAR STRUCTURE Calculations for ${}_{72}{}^{176}{}_{}{}^{}\mathrm{Hf}_{104}^{}{}_{}{}^{}$, yrast traps, cranking Hartree-Fock-Bogoliubov theory, rotation around the symmetry axis.

A new method for a solution of the bound-state Faddeev equations in momentum space is presented. The method takes advantage of an expansion of the Faddeev amplitude into a suitable set of basis states and uses the potential directly. To demonstrate the practicability we have recalculated the triton binding energy for the Reid soft-core potential including all partial waves up to a maximal subsystem angular momentum $j=2\mathrm{}$. We found $E_B=-7.56\mathrm{}\pm 0.10$ MeV. The Reid potential truncated to the ${}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{}$ and ${}_{}{}^3{}_{}{}^{}S_1^{}{}_{}{}^{}-{}_{}{}^3{}_{}{}^{}D_1^{}{}_{}{}^{}$ states yields $E_B=-7.53\mathrm{}\pm 0.08$ MeV.

NUCLEAR STRUCTURE ${}_{}{}^3{}_{}{}^{}\mathrm{H}$; calculate binding energy; include all partial waves of Read potential up to $J\le 2$; Faddeev approach.

The angular momentum projected deformed particle-hole model (projected Tamm-Dancoff) is applied to the positive parity states of the nuclei ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ and ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$. For the single particle states a large basis containing three major shells is used. The effects of a truncation of this basis to the $1s-0d$ shell only are studied, and the possibility of describing these effects by a perturbation expansion is investigated. It turns out that a perturbation expansion in terms of self-consistent projected Tamm-Dancoff states yields a very good agreement already in lowest order, while the usual renormalization of the interaction in terms of spherical one particle-one hole states fails to reproduce the result obtained in the large model space. The reliability of the projected Tamm-Dancoff model is confirmed by a comparison to an exact shell model calculation.

NUCLEAR STRUCTURE Angular momentum projected particle-hole model, effective interactions, ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$, ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$.

Upper limits on the ratio of neutron to proton knockout to the ($2^{+},T=1\mathrm{}$) analog levels in ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$ and ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$ by ${\pi }^{-}$ at 200 MeV are consistent with the nucleon charge exchange model, as modified by nuclear structure considerations. In contrast, the impulse approximation and a semiclassical nucleon charge exchange model give ratios which are larger than the upper bounds. In comparing cross sections involving different final residual nuclei, it is important to consider the relative fragility of the daughter nuclei.

NUCLEAR REACTIONS Ratios (${\pi }^{-},{\pi }^{-}n$) to (${\pi }^{-},{\pi }^{-}p+{\pi }^{0}n$) for ($2^{+},T=1\mathrm{}$) levels, ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$ and ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$, $T_{\pi }=200\mathrm{}$ MeV, detect deexcitation $\gamma \text{'}\mathrm{s}$. Importance of nucleon charge exchange to IAS'S. Relative fragility of daughters.

The $R$ matrix calculation of Baker, Hind, and Kahane for the energy of nuclear matter is reanalyzed. We find that because of the Padé summation used, the $R$ matrix theory is qualitatively similar to the usual Brueckner theory with self-energies. Both theories differ qualitatively from variational theories using Jastrow correlation functions.

NUCLEAR STRUCTURE Nuclear matter; compared Baker, Brueckner, and Jastrow (FHNC) energies.

The ${}_{}{}^{37}{}_{}{}^{}\mathrm{Cl}(\alpha ,d){}_{}{}^{39}{}_{}{}^{}\mathrm{Ar}$ reaction has been studied at a bombarding energy of 27 MeV. Peaks corresponding to at least 25 states in ${}_{}{}^{39}{}_{}{}^{}\mathrm{Ar}$ were identified. The strongest-fed states were those at 5.26 and 5.54 MeV, while the 3.38 MeV state was very weak. Angular distributions were measured for several of the stronger states and the data compared to distorted-wave Born approximation calculations.

NUCLEAR REACTIONS ${}_{}{}^{37}{}_{}{}^{}\mathrm{Cl}(\alpha ,d)$, > 25 levels, measured $\sigma \left(\theta \right)$, DWBA analysis, high-spin states, position of anti-analog.