Recent Articles

Parametrization of the Paris $N - N$ potential

M. Lacombe, B. Loiseau, J. M. Richard, R. Vinh Mau, J. Côté, P. Pirès, and R. de Tourreil

Phys. Rev. C 21, 861 (1980) - Published 1 March, 1980

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In view of practical nuclear structure calculations the Paris $N - N$ potential is parametrized in a simple analytical form. This parametrization consists of a regularized discrete superposition of Yukawa-type terms. Results for phase shifts and deuteron parameters are presented as well as nuclear matter binding energy obtained with this potential.

NUCLEAR REACTIONS Nucleon-nucleon interaction, parametrization of the Paris $N - N$ potential. 0 to 330 MeV $N - N$ phase shifts.

Vibrational states in ${}^{250}{Cf}$ excited by the ( $d$ , $d^{'}$ ) reaction

I. Ahmad, A. M. Friedman, and S. W. Yates

Phys. Rev. C 21, 874 (1980) - Published 1 March, 1980

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Collective states in ${}^{250}{Cf}$ have been studied by inelastic deuteron scattering at 15 MeV. Deuterons scattered from a 10 μg/ ${cm}^{2}$ ${}^{250}{Cf}$ target were momentum analyzed with an Enge split-pole magnetic spectrograph. Spectra were recorded at angles of 90°, 125°, and 140° with respect to the incident beam. The differential cross sections and angular distributions of inelastic deuteron groups confirm the assignments of the previously known $K π = 2 -$ state at 872 keV and the $K π = 2 +$ state at 1032 keV. Levels at 1211 and 1429 keV, which are strongly populated in the ( $d$ , $d^{'}$ ) reaction, are assigned as the 3—member of the $K π = 1 - and 3 -$ bands, respectively. Reduced transition probabilities $B (E 2)$ and $B (E 3)$ have been extracted for the 2+ and 3- level and are compared with the predictions of microscopic theories of vibrational states.

NUCLEAR REACTION ${}^{250}{Cf}$ ( $d$ , $d^{'}$ ), $E_{d} = 15$ MeV; measured $σ (E_{d}, Θ)$ . ${}^{250}{Cf}$ deduced levels, $J$ , $K$ , $π$ , $B (E 2)$ , $B (E 3)$ . Mass-separated ${}^{250}{Cf}$ target.

Neutron hole states in ${}^{207, 206, 205}{Pb}$ isotopes via the ( ${}^{3}{He}$ , $α$ ) reaction at 100 MeV

J. Guillot, J. Van de Wiele, H. Langevin-Joliot, E. Gerlic, J. P. Didelez, G. Duhamel, G. Perrin, M. Buenerd, and J. Chauvin

Phys. Rev. C 21, 879 (1980) - Published 1 March, 1980

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Neutron hole states were investigated in the ${}^{207, 206, 205}{Pb}$ isotopes up to 25 MeV excitation energy using the ( ${}^{3}{He}$ , $α$ ) reaction at 100 MeV incident energy with 100 keV energy resolution. Above the well-matched low-lying levels corresponding to high angular momentum transfers, new peaks are identified. In addition, three gross structures, riding on a continuous background, are observed in each of the three isotopes, with some fine structures showing up to 10 MeV excitation energy. For ${}^{207}{Pb}$ , angular distributions have been obtained for the low-lying levels as well as for the deeply bound hole states. The data have been analyzed with distorted-wave Born-approximation calculations and spectroscopic factors extracted. It has been found that the low-lying levels do not exhaust the $1 i \frac{13}{2}$ and $1 h \frac{9}{2}$ neutron hole strengths. Corrections for exact finite-range effects, form factor shapes, and indirect pickup contributions have been calculated, and modify significantly the $2 f \frac{7}{2}$ spectroscopic measured strength but not the $1 i \frac{13}{2}$ and the $1 h \frac{9}{2}$ ones. Most of the $1 i \frac{13}{2}$ and $1 h \frac{9}{2}$ missing strengths are found in the "bump" located at about 5 MeV excitation energy. The highly fragmented bump observed at about 8 MeV excitation energy is shown to arise from $1 h \frac{11}{2}$ neutron pickup exhausting 45% of the sum-rule limit. Finally, the very smooth structure extending to 21 MeV excitation energy is tentatively attributed to $1 g \frac{7}{2} + 1 g \frac{9}{2}$ neutron holes with 80% of the total strength. In ${}^{207}{Pb}$ , the four first isobaric analog states are observed as narrow structures around 20 MeV excitation energy.

NUCLEAR REACTIONS ${}^{208, 207, 206}{Pb}$ ( ${}^{3}{He}$ , $α$ ), $E = 101.75$ MeV; measured $σ (E_{α}, θ)$ , ${}^{207, 206, 205}{Pb}$ deduced levels, $Ex$ , $l$ , $J$ , $π$ , $C^{2} S$ ; ${}^{207, 206, 205}{Pb}$ inner shell spectroscopic factors: enriched targets, magnetic spectrometer.

Systematics of proton absorption deduced from ( $p$ , $p$ ) and ( $p$ , $n$ ) cross sections for 2.0- to 6.7-MeV protons on ${}^{107, 109}{Ag}$ and ${}^{115}{In}$

R. L. Hershberger, D. S. Flynn, F. Gabbard, and C. H. Johnson

Phys. Rev. C 21, 896 (1980) - Published 1 March, 1980

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The ( $p$ , $p$ ) and ( $p$ , $n$ ) cross sections were measured to accuracies of ±2% and ±3%, respectively, for 2.0- to 6.7-MeV protons on ${}^{107, 109}{Ag}$ and ${}^{115}{In}$ . Hauser-Feshbach calculations, which included $γ$ -ray emission channels, were used to convert the ( $p$ , $n$ ) cross sections to proton absorption cross sections. Analysis of the ( $p$ , $p$ ) and deduced proton absorption cross sections were made simultaneously using a conventional optical-model potential. The measured cross sections can be described using parameters extrapolated from the Sn region in a systematic way, except for a large increase required for the depth of the absorptive potential.

NUCLEAR REACTIONS ${}^{107, 109}{Ag}$ and ${}^{115}{In}$ ( $p$ , $p$ ) and ( $p$ , $n$ ), $E = 2.0 to 6.7$ MeV, resolution 30 to 70 keV, enriched targets. Measured ( $\frac{d σ}{d Ω}$ ) ( $p$ , $p$ ) at 135° and 165°, and total $σ (p, n)$ . Observed analog resonances. Statistical-model and optical-model analyses, deduced model parameters.

Isospin structure of the giant dipole resonance in ${}^{41}{Ca}$

L. Nilsson, M. Drosg, D. M. Drake, and A. Lindholm

Phys. Rev. C 21, 902 (1980) - Published 1 March, 1980

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Differential 90° cross sections for ${}^{40}K$ ( $p$ , $γ_{0}$ ) ${}^{41}{Ca}$ were measured over the entire giant dipole resonance region. The data are compared with similar results for the ${}^{40}{Ca}$ ( $n$ , $γ_{0}$ ) ${}^{41}{Ca}$ reaction and with calculations based on the direct-semidirect capture model. An observed energy difference of about 1.5 MeV between the centroids of the ( $p$ , $γ_{0}$ ) and ( $n$ , $γ_{0}$ ) cross-section curves is interpreted as the result of isospin selection rules.

NUCLEAR REACTIONS ${}^{40}K$ ( $p$ , $γ_{0}$ ) ${}^{41}{Ca}$ in the giant dipole energy region. Shows evidence for a shift of GDR due to isospin splitting.

Polarized triton elastic scattering at 17 MeV

R. A. Hardekopf, R. F. Haglund, Jr., G. G. Ohlsen, W. J. Thompson, and L. R. Veeser

Phys. Rev. C 21, 906 (1980) - Published 1 March, 1980

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We present differential-cross-section and analyzing-power angular distributions for the elastic scattering of polarized tritons from 13 nuclei with $40 \leq A \leq 208$ . Data obtained at an energy of 17 MeV and in the angular range $20 ° \leq θ \leq 160 °$ are the basis for an optical-model analysis in which parameters which fit both observables simultaneously are determined. It is observed that the analyzing-power data delimit the real potential well parameters much more precisely than do cross-section data alone. Although the spin-orbit potential is less well defined, the average spin-orbit well depth is $V_{so} = 6.2 \pm 1.5$ MeV with geometry parameters similar to those for nucleons. The spin-orbit volume integrals are about a factor of 3 greater than predicted from simple folding models.

NUCLEAR REACTIONS ${}^{40}{Ca}$ , ${}^{46}{Ti}$ , ${}^{48}{Ti}$ , ${}^{54}{Fe}$ , ${}^{56}{Fe}$ , ${}^{58}{Ni}$ , ${}^{60}{Ni}$ , ${}^{68}{Zn}$ , ${}^{90}{Zr}$ , ${}^{94}{Zr}$ , ${}^{116}{Sn}$ , ${}^{140}{Ce}$ , ${}^{208}{Pb}$ ( $t$ , $t$ ), $E = 17$ MeV; measured $σ (θ)$ , $A_{y} (θ)$ ; optical-model analysis.

Justification of local potentials in coupled channel problems

Torsten Fliessbach

Phys. Rev. C 21, 919 (1980) - Published 1 March, 1980

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It is often stated that for reactions between two nuclei, the exchange terms lead to serious nonlocalities in the potential. The resonating group function $u_{E}$ indeed obeys a strongly nonlocal equation. However, $u_{E}$ is not a wave function and it is impossible to approximate its equation by a Schrödinger equation with a local potential. As statd by several authors, one has to consider $Ω_{E} = {(1 - \hat{K})}^{\frac{1}{2}}$ $u_{E}$ instead of $u_{E}$ where $1 - \hat{K}$ is the norm kernel. In this paper, these statements are verified in a simple model in which the Hamiltonian and norm kernels are given analytically for both $u$ and $Ω$ . We then investigate the corresponding equations for several (in general, coupled) channels and the possibility of using local potentials in these equations. Alpha decay into more than one channel is discussed as an example.

NUCLEAR REACTIONS Local potentials in coupled channel problems. Spectroscopic factor for $α$ decay.

Effect of the Pauli principle on ion-ion cross sections in the impulse approximation

E. S. Hernandez and S. A. Moszkowski

Phys. Rev. C 21, 929 (1980) - Published 1 March, 1980

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The behavior of the ion-ion cross sections under the effect of the Pauli principle is examined in the framework of the Fermi gas model and the impulse approximation. The importance of center-of-mass motion of interacting pairs of nucleons is analyzed. Interesting features of the Pauli corrections in the low-momentum range are discussed.

NUCLEAR REACTIONS Ion-ion cross sections, Pauli principle.

High-spin band structure of ${}^{192}{Tl}$

A. J. Kreiner, A. Filevich, G. García Bermúdez, M. A. J. Mariscotti, C. Baktash, E. der Mateosian, and P. Thieberger

Phys. Rev. C 21, 933 (1980) - Published 1 March, 1980

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High-spin states in ${}^{192}{Tl}$ , excited through the ${}^{181}{Ta}$ ( ${}^{18}O$ , $7 n$ ) and ${}^{181}{Ta}$ ( ${}^{16}O$ , $5 n$ ) reactions, were studied using in-beam $γ$ -ray spectroscopic techniques. Excitation functions, activity spectra, $γ$ -ray angular distributions, and multidimensional coincidences were measured. The strongly Coríolis-distorted $\tilde{π} h_{\frac{9}{2}} \times \tilde{ν} i_{\frac{13}{2}}$ two-quasiparticle band already known in the heavier ${}^{194, 196, 198}{Tl}$ isotopes has also been found in this case based on an $I^{π} = 8^{-}$ isomeric state at 250.6 keV above the known long-lived $7^{+}$ level. Trends already noted in the other Tl isotopes and also predicted by two-quasiparticle plus-rotor model calculations are confirmed thus reinforcing such a theoretical description.

NUCLEAR REACTIONS ${}^{181}{Ta}$ ( ${}^{18}O$ , $xn γ$ ), $E = 105 - 125$ MeV; ${}^{181}{Ta}$ ( ${}^{16}O$ , $xn γ$ ), $E = 95 - 105$ MeV; measured $E_{γ}$ , $I_{γ}$ , $σ (E, E_{γ}, θ_{γ})$ , $γ - γ$ coin.; ${}^{192}{Tl}$ levels deduced, $J$ , $π$ , $T_{\frac{1}{2}}$ . Natural target. Ge(Li) detectors.

Semiempirical methods for estimating fragment spins from studies of ${}^{4}{He}$ and ${}^{1}H$ emission

Gary L. Catchen, Morton Kaplan, John M. Alexander, and M. F. Rivet

Phys. Rev. C 21, 940 (1980) - Published 1 March, 1980

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The statistical model provides equations that relate the angular correlations of evaporated particles to the angular momenta of the emitters. We discuss the relationships between several theoretical approaches and their application to experimental measurements. Available calibration data are collected from studies of the compound nuclei ${}^{75}{Br}$ * and ${}^{117}{Te}$ *. Semiempirical use of the theory and these calibrations provides a very interesting possibility for determining fragment spins in deeply inelastic reactions. A further possibility is provided by empirical use of the emission multiplicity ratios for ${}^{4}{He}$ to ${}^{1}H$ . These methods are used to estimate the root-mean-square spin of the projectilelike fragments produced in deeply inelastic reactions of 724 MeV ${}^{86}{Kr}$ + Au.

NUCLEAR REACTIONS Synthesis of theoretical equations that relate anisotropies in particle evaporation to spin of the emitter. Semiempirical correlations presented with data from the literature on both anisotropies and multiplicities of ${}^{1}H$ and ${}^{4}{He}$ .

${}^{13}C$ ( ${}^{6}{Li}$ , $t$ ) ${}^{16}O$ reaction in the 20-32 MeV incident energy range

A. Cunsolo, A. Foti, G. Immè, G. Pappalardo, G. Raciti, F. Rizzo, and N. Saunier

Phys. Rev. C 21, 952 (1980) - Published 1 March, 1980

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The reaction ${}^{13}C$ ( ${}^{6}{Li}$ , $t$ ) ${}^{16}O$ has been studied in the 20-32 MeV incident energy range. Angular distributions have been measured at $E_{{}^{6}{Li}} = 28$ MeV; the data have been analyzed in terms of Hauser-Feshbach and exact finite range distorted-wave Born-approximation theories. The extracted relative ${}^{3}{He}$ spectroscopic strengths show a satisfactory independence from the optical model parameters.

NUCLEAR REACTIONS ${}^{13}C$ ( ${}^{6}{Li}$ , $t$ ) $E = 20 - 32$ MeV; measured $σ (E, θ)$ ; ${}^{16}O$ levels deduced S. HF and EFR-DWBA analysis.

Signatures of molecular single-particle states by level crossings in heavy ion collisions

Jae Y. Park, Walter Greiner, and Werner Scheid

Phys. Rev. C 21, 958 (1980) - Published 1 March, 1980

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In heavy ion collisions, the molecular single-particle motion may cause specific structures in the energy dependence of the cross sections which arise by the promotion of nucleons at level crossings according to the Landau-Zener excitation mechanism. In order to examine this effect in asymmetric heavy ion collisions, we have calculated level diagrams of the two-center shell model for the target projectile combinations ${}^{13}C$ + ${}^{16}O$ and ${}^{12}C$ + ${}^{17}O$ and analyzed with respect to inelastic excitation and neutron transfer. We select certain reactions as possible candidates for showing enhanced cross sections for nucleon excitation and transfer due to real and avoided level crossings near the Fermi level.

NUCLEAR REACTIONS Heavy ion scattering, molecular theory of nucleon transfer, asymmetric two-center shell model; ${}^{13}C$ ( ${}^{16}O$ , ${}^{17}O$ ), calculated level diagrams.

Emission of long-range alpha particles in the photofission of ${}^{235}U$ with 20-MeV bremsstrahlung

P. D'hondt, E. Jacobs, A. De Clercq, D. De Frenne, H. Thierens, P. De Gelder, and A. J. Deruytter

Phys. Rev. C 21, 963 (1980) - Published 1 March, 1980

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Long-range alpha particles emitted in the photofission of ${}^{235}U$ with 20-MeV bremsstrahlung were measured. The binary to long-range alpha particle ratio, $〈 E_{α} 〉$ , and full width at half maximum ( $E_{α}$ ) were deduced.

NUCLEAR REACTIONS, FISSION ${}^{235}U$ ( $γ$ , $F$ ), $E_{γ max} = 20$ MeV, measured: Long-range $α$ spectrum.

Spontaneous fission of ${}^{259}{Fm}$

E. K. Hulet, R. W. Lougheed, J. H. Landrum, J. F. Wild, D. C. Hoffman, J. Weber, and J. B. Wilhelmy

Phys. Rev. C 21, 966 (1980) - Published 1 March, 1980

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A 1.5-s spontaneous fission activity has been produced by irradiating ${}^{257}{Fm}$ with 16-MeV tritons. On the basis of formation cross sections, fission half-life systematics, and the identification of other possible products, this 1.5-s activity has been attributed to ${}^{259}{Fm}$ formed by the reaction ${}^{257}{Fm}$ ( $t$ , $p$ ) ${}^{259}{Fm}$ . ${}^{259}{Fm}$ is the heaviest known isotope of Fm and has more neutrons than any other nuclide thus far identified. This measurement of the spontaneous fission of ${}^{259}{Fm}$ is the first to show a narrow, predominantly symmetric, mass division from spontaneous fission. It is accompanied by a very high kinetic energy, the most probable total kinetic energy being 242±6 MeV. These features show a marked acceleration in the trend toward more symmetric mass division and higher total kinetic energies than have been observed previously for the Fm isotopes as the mass increased.

NUCLEAR REACTIONS, RADIOACTIVITY, FISSION ${}^{259}{Fm}$ , (SF); measured fragment-fragment $E$ , $T_{\frac{1}{2}}$ ; deduced fragment mass distribution; ${}^{257}{Fm}$ ( $t$ , $p$ ), estimated $σ$ .

12.3-min ${}^{256}{Cf}$ and 43-min ${}^{258}{Md}$ and systematics of the spontaneous fission properties of heavy nuclides

D. C. Hoffman, J. B. Wilhelmy, J. Weber, W. R. Daniels, E. K. Hulet, R. W. Lougheed, J. H. Landrum, J. F. Wild, and R. J. Dupzyk

Phys. Rev. C 21, 972 (1980) - Published 1 March, 1980

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The new isotope 12.3-min ${}^{256}{Cf}$ was produced via the ${}^{254}{Cf}$ ( $t$ , $p$ ) reaction, and a new 43-min isomer of ${}^{258}{Md}$ was produced via the ${}^{255}{Es}$ ( $α$ , $n$ ) reaction. The fragment mass and kinetic energy distributions from the spontaneous fission of ${}^{256}{Cf}$ were found to be very similar to those from the spontaneous fission of lighter Cf isotopes. The mass division is primarily asymmetric, and the average total kinetic energy is 189.8±0.9 MeV. The 43-min ${}^{258}{Md}$ presumably decays by electron capture and provides an opportunity to study the mass and kinetic energy distributions from the spontaneous fission of the 380-μs ${}^{258}{Fm}$ daughter. The observed narrow, symmetric mass distribution and the most probable total kinetic energy of 238±3 MeV are similar to those reported for the spontaneous fission of ${}^{259}{Fm}$ but show a sharp increase in symmetric mass division and total kinetic energy compared to ${}^{257}{Fm}$ and the lighter Fm isotopes. No such abrupt change in properties was observed for ${}^{256}{Cf}$ , which, like ${}^{258}{Fm}$ , has 158 neutrons. The marked difference between the spontaneous fission properties of the heavier Fm isotopes and those of other spontaneously fissioning nuclides is compared to some theoretical predictions.

RADIOACTIVITY, FISSION ${}^{256}{Cf}$ (SF); measured $T_{\frac{1}{2}}$ , fragment-fragment coin; deduced TKE, mass distribution. ${}^{258}{Md}$ ; Measured $T_{\frac{1}{2}}$ ; EC decay to ${}^{258}{Fm}$ (SF); measured fragment-fragment coin; deduced TKE, mass distribution.

Fission in a wall-and-window one-body-dissipation model

Arnold J. Sierk and J. Rayford Nix

Phys. Rev. C 21, 982 (1980) - Published 1 March, 1980

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We calculate the fission of idealized nuclei in a modified liquid-drop model. The potential energy is taken to be a combination of Coulomb energy and nuclear energy obtained by double folding a Yukawa-plus-exponential two-body potential. The collective nuclear kinetic energy is calculated by use of the Werner-Wheeler approximation to incompressible, irrotational flow. The dissipation of collective energy into internal energy is calculated from the one-body wall formula until the neck decreases to a critical size, at which point a transition is made to a combination of the one-body wall formula relative to the centers of mass of the two nascent fragments and the one-body window formula. Experimental fission-fragment kinetic energies for the fission of nuclei throughout the Periodic Table are reproduced optimally when the neck radius at the transition point is 2.5 fm. For the alternative dissipation mechanism of ordinary two-body viscosity, the experimental fission-fragment kinetic energies are reproduced equally well when the viscosity coefficient is 0.015 TP.

NUCLEAR REACTIONS, FISSION ${}^{236}U$ , nuclei throughout Periodic Table; calculated most probable fission-fragment kinetic energies. Modified liquid-drop model, Yukawa-plus-exponential potential, one-body dissipation, wall formula, window formula, two-body viscosity.

Neutron-proton elastic scattering between 200 and 500 MeV. I. Experimental details and measurements of the $D_{t}$ and $P$ parameters

A. S. Clough, D. R. Gibson, D. Axen, R. Dubois, L. Felawka, R. Keeler, G. A. Ludgate, C. J. Oram, C. Amsler, D. V. Bugg, J. A. Edgington, L. P. Robertson, N. M. Stewart, J. Beveridge, and J. R. Richardson

Phys. Rev. C 21, 988 (1980) - Published 1 March, 1980

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Measurements over an extensive angular range of the $D_{t}$ and $P$ parameters in free neutron-proton elastic scattering at laboratory energies of 220, 325, 425, and 495 MeV are reported. Experimental and analytical details are given.

NUCLEAR REACTIONS $p (\vec{n}, \vec{p}) n$ , $E = 220, 325, 425, and 495$ MeV; measured $D_{t} (θ)$ , $P (θ)$ .

Neutron-proton elastic scattering between 200 and 500 MeV. II. Measurement of $R_{t}$ and $A_{t}$

D. Axen, R. Dubois, R. Keeler, G. A. Ludgate, C. J. Oram, L. P. Robertson, N. M. Stewart, C. Amsler, D. V. Bugg, J. A. Edgington, W. R. Gibson, N. Wright, and A. S. Clough

Phys. Rev. C 21, 998 (1980) - Published 1 March, 1980

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Reactions ${}^{7}{Li} (e, {}^{6}{He)} p e^{'}$ and ${}^{7}{Li} (e, {}^{6}{Li)} n e^{'}$ at intermediate excitation energies

J. Asai, J. J. Murphy, II, and D. M. Skopik

Phys. Rev. C 21, 469 (1980) - Published 1 February, 1980

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The reactions ${}^{7}{Li} (e, {}^{6}{He)} p e^{'}$ and ${}^{7}{Li} (e, {}^{6}{Li)} n e^{'}$ have been studied at intermediate excitation energies. Angular distributions as well as energy distributions are presented. The experimental cross sections are compared to the results obtained from a simple model.

NUCLEAR REACTIONS ${}^{7}{Li} (e, {}^{6}{He)}$ , ${}^{7}{Li} (e, {}^{6}{Li)}$ , $E = 108, 163, 198$ MeV; measured $σ (E, θ)$ . Natural targets.

$A_{zz} (0 °)$ for the charge-symmetric ${}^{3}{He} (\vec{d}, p) {}^{4}{He}$ and ${}^{3}H (\vec{d}, n) {}^{4}{He}$ reactions below 6.75 MeV

L. J. Dries, H. W. Clark, R. Detomo, Jr., J. L. Regner, and T. R. Donoghue

Phys. Rev. C 21, 475 (1980) - Published 1 February, 1980

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The tensor analyzing power of $A_{zz} (0 °)$ has been measured for the charge symmetric ${}^{3}{He} (d, p) {}^{4}{He}$ and ${}^{3}H (d, n) {}^{4}{He}$ reactions as a function of incident deuteron energy from 0.24 to 6.75 MeV. The measurements were performed in a nearly simultaneous fashion to ensure that a meaningful comparison of $A_{zz} (0 °)$ for the two reactions could be made. The absolute scale of the ${}^{3}{He} (d, p) {}^{4}{He}$ analyzing power was calibrated at four energies using the isospin forbidden ${}^{16}O (d, α_{1}) {}^{14}N$ reaction. Large differences in $A_{zz} (0 °)$ for the two reactions were observed for energies both below 1.65 MeV and above 4 MeV. The ${}^{3}H (d, n) {}^{4}{He}$ data reported here resolve discrepancies in published data of other authors; the ${}^{3}{He} (d, p) {}^{4}{He}$ results confirm previously reported measurements, except for a small scale shift.

NUCLEAR REACTIONS ${}^{3}{He} (\vec{d}, p) {}^{4}{He}$ , ${}^{3}H (\vec{d}, n) {}^{4}{He}$ , $E = 0.24 - 6.75$ MeV; measured $A_{zz} (0 °)$ ; calibrated beam polarization by ${}^{16}O (\vec{d}, α_{1}) {}^{14}N$ reaction.

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Parametrization of the Paris $N - N$ potential

Vibrational states in ${}^{250}{Cf}$ excited by the ( $d$ , $d^{'}$ ) reaction

Neutron hole states in ${}^{207, 206, 205}{Pb}$ isotopes via the ( ${}^{3}{He}$ , $α$ ) reaction at 100 MeV

Systematics of proton absorption deduced from ( $p$ , $p$ ) and ( $p$ , $n$ ) cross sections for 2.0- to 6.7-MeV protons on ${}^{107, 109}{Ag}$ and ${}^{115}{In}$

Isospin structure of the giant dipole resonance in ${}^{41}{Ca}$

Polarized triton elastic scattering at 17 MeV

Justification of local potentials in coupled channel problems

Effect of the Pauli principle on ion-ion cross sections in the impulse approximation

High-spin band structure of ${}^{192}{Tl}$

Semiempirical methods for estimating fragment spins from studies of ${}^{4}{He}$ and ${}^{1}H$ emission

${}^{13}C$ ( ${}^{6}{Li}$ , $t$ ) ${}^{16}O$ reaction in the 20-32 MeV incident energy range

Signatures of molecular single-particle states by level crossings in heavy ion collisions

Emission of long-range alpha particles in the photofission of ${}^{235}U$ with 20-MeV bremsstrahlung

Spontaneous fission of ${}^{259}{Fm}$

12.3-min ${}^{256}{Cf}$ and 43-min ${}^{258}{Md}$ and systematics of the spontaneous fission properties of heavy nuclides

Fission in a wall-and-window one-body-dissipation model

Neutron-proton elastic scattering between 200 and 500 MeV. I. Experimental details and measurements of the $D_{t}$ and $P$ parameters

Neutron-proton elastic scattering between 200 and 500 MeV. II. Measurement of $R_{t}$ and $A_{t}$

Reactions ${}^{7}{Li} (e, {}^{6}{He)} p e^{'}$ and ${}^{7}{Li} (e, {}^{6}{Li)} n e^{'}$ at intermediate excitation energies

$A_{zz} (0 °)$ for the charge-symmetric ${}^{3}{He} (\vec{d}, p) {}^{4}{He}$ and ${}^{3}H (\vec{d}, n) {}^{4}{He}$ reactions below 6.75 MeV

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