Recent Articles

${}^{74}{Ge} (t, p) {}^{76}{Ge}$ reaction

S. Mordechai, H. T. Fortune, R. Middleton, and G. Stephans

Phys. Rev. C 18, 2498 (1978) - Published 1 December, 1978

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The reaction ${}^{74}{Ge} (t, p) {}^{76}{Ge}$ has been investigated with a 15 MeV triton beam. Twenty-six energy levels of ${}^{76}{Ge}$ were identified up to about 4 MeV excitation, five of which were unreported previously. Angular distributions were measured and compared with distorted-wave Born-approximation calculations. The first and second excited 0+ states in ${}^{76}{Ge}$ have been located at 1.911 and 2.901 MeV. Thirteen additional new spin and parity assignments have been made. The systematic structure of the low-lying 0+ states observed in the $Ge (t, p)$ reactions on several isotopes support the idea of a shape transition previously proposed for these nuclei but for $N \geq 46$ there is a rapid change toward a spherical shape.

NUCLEAR REACTIONS ${}^{74}{Ge} (t, p)$ , $E_{t} = 15.0$ MeV; measured $σ (E_{p}, θ) {}^{76}{Ge}$ deduced levels, $L$ , $π$ , $J$ . DWBA analysis.

Multiplet structure in ${}^{203}{Pb}$

L. E. Dinescu, D. Mueller, and R. A. Naumann

Phys. Rev. C 18, 2506 (1978) - Published 1 December, 1978

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The ${}^{205}{Pb} (p, t) {}^{203}{Pb}$ reaction has been studied at 35 MeV bombarding energy using the long-lived radioactive ${}^{205}{Pb}$ isotope. Tritons were detected in the focal plane of a quadrupole-dipole-dipole-dipole spectrometer by a resistive-wire proportional counter backed by a plastic scintillator. Multiplet structure due to the coupling of the odd $f_{\frac{5}{2}}$ neutron to the 2+ vibrational core was observed. Distorted-wave Born approximation calculations reproduced the shape of the angular distributions and allowed determination of $L$ transfers.

NUCLEAR REACTIONS ${}^{205}{Pb} (p, t)$ , $E = 35$ MeV; measured $σ (θ)$ and level energies; DWBA analysis, deduced $L$ , $J^{π}$ . Resolution 12 keV. Radioactive target.

${}^{59}{Ni} (t, p) {}^{61}{Ni}$ reaction

H. Nann, E. R. Flynn, D. L. Hanson, and S. Raman

Phys. Rev. C 18, 2511 (1978) - Published 1 December, 1978

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Angular distributions of the ${}^{59}{Ni} (t, p) {}^{61}{Ni}$ at 17 MeV bombarding energy have been measured for states in ${}^{61}{Ni}$ up to an excitation energy of 3 MeV. A distorted-wave analysis based on shell-model wave functions was performed and compared to the experimental differential cross sections. The states near 1 MeV of excitation are interpreted as a particle-vibration multiplet arising from weak coupling of the ground state orbital to the collective 2+ state in the neighboring even Ni isotopes.

NUCLEAR REACTIONS ${}^{59}{Ni} (t, p)$ , $E = 17$ MeV; measured $σ (E_{p}, θ)$ ; enriched target. ${}^{61}{Ni}$ deduced $L$ , $J$ , $π$ ; DWBA analysis.

Level and decay scheme studies in ${}^{92}{Zr}$ and ${}^{94}{Zr}$ via ( $n, n^{'} γ$ ) reactions

G. P. Glasgow, F. D. McDaniel, J. L. Weil, J. D. Brandenberger, and M. T. McEllistrem

Phys. Rev. C 18, 2520 (1978) - Published 1 December, 1978

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Measurements of ( $n, n^{'} γ$ ) excitation functions were made for incident neutron energies from 2.2 to 3.7 MeV. For ${}^{92}{Zr}$ , 51 transitions from 26 levels through 3472.0 keV excitation energy were observed. The ${}^{94}{Zr}$ study of 20 levels through 3361.2 keV excitation energy produced 28 observed $γ$ rays, 12 of which were previously unidentified. Angular distributions were measured at 3.2 and 3.7 MeV bombarding energies for 24 and 39 transitions respectively in ${}^{92}{Zr}$ and at 3.1 MeV for 18 transitions in ${}^{94}{Zr}$ . Two new levels were discovered in ${}^{92}{Zr}$ at 2903.8 and 3407.9 keV. A previously reported ambiguity involving 2+ and 4+ levels in ${}^{94}{Zr}$ has been resolved, revealing a 4+ level at 2329.0 keV and a 2+ level at 2365.4 keV. New levels were found in this isotope at 2507.6, 2698.0, 2825.2, and 2859.8 keV. Six unique spin or spin-parity assignments, based only on the present work, were made in ${}^{92}{Zr}$ ( $E_{x}$ in keV, $J^{π}$ ): 2339.0, 3; 2485.1, 5; 2742.6, 4; 2903.8, 0; 3056.5, 2; 3370.9, 1; and three in ${}^{94}{Zr}$ : 2365.4, 2; 2507.6, 3; 2603.7, (5). A $4^{-}$ , $5^{-}$ excited proton doublet appears to have been found in each of the isotopes at excitation energies comparable to those for the doublet in ${}^{90}{Zr}$ . This suggests similar proton configurations for all three isotopes. Neutron inelastic scattering cross sections are in agreement with those from experiments employing neutron detection.

NUCLEAR REACTIONS ${}^{92, 94}{Zr} (n, n^{'} γ)$ , $E = 2.2 - 3.7$ MeV; measured $E_{γ}$ , $σ (E; E_{γ}, 90 °)$ , $σ (E_{γ}, ⊖_{γ})$ . Calculated $σ (n^{'})$ , $σ (E_{γ}, ⊖_{γ})$ , with statistical model. ${}^{92, 94}{Zr}$ deduced levels, $σ (n^{'})$ , $δ$ , $J$ , $π$ , branching ratio. Enriched targets, Ge(Li) detectors, time-of-flight background suppression.

The nuclear excitation rate for low-lying excited states in ${}^{237}U$ and ${}^{238}U$

G. D. Doolen

Phys. Rev. C 18, 2547 (1978) - Published 1 December, 1978

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The rate at which the first nuclear excited state becomes populated is calculated as a function of temperature up to 30 keV for compressions from 0.3 times normal density to 100 times normal density for ${}^{237}U$ . Detailed results are also presented for ${}^{238}U$ . The deexcitation rates are shown to change by several orders of magnitude and the excitation rates are shown to be in the order of several percent per nanosecond at high temperatures and compressions.

NUCLEAR REACTIONS Electron and photon induced reactions; ${}^{237}U$ and ${}^{238}U$ first excited states, lifetimes and internal conversion coefficients calculated, temperatures up to 30 keV and compression up to 100 times normal density.

Upper limits for the ${}^{27}{Al}$ + ${}^{16}O$ and ${}^{93}{Nb}$ + ${}^{16}O$ radiative-capture cross sections

D. Branford and S. G. Steadman

Phys. Rev. C 18, 2560 (1978) - Published 1 December, 1978

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Thick targets of high purity aluminium and niobium were bombarded with ${}^{16}O$ ions in the energy range 50-65 MeV. The yields of reaction products were obtained off-line using a Ge(Li) detector to observe residual $γ$ activities. Ungated $γ$ spectra and $γ$ spectra in coincidence with pairs of 511 keV annihilation quanta, observed in an array of four 7.5 × 7.5 cm NaI(T1) detectors, were recorded. Upper limits of 0.2μb and 0.1 μb were obtained for the ${}^{27}{Al} ({}^{16}O, γ) {}^{43}{Sc}$ and ${}^{93}{Nb} ({}^{16}O, γ) {}^{109}{In}$ radiative capture cross sections, respectively. These limits are compared to previously reported data and to the results of statistical model calculations. It is concluded that some previously reported total heavy-ion radiative capture results may be in error and tentative explanations for this are offered.

NUCLEAR REACTIONS ${}^{27}{Al}$ + ${}^{16}O$ , ${}^{93}{Nb}$ + ${}^{16}O$ , $E = 50 - 65$ MeV; measured upper limits for yields of activation products ${}^{43}{Sc}$ and ${}^{109}{In}$ ; calculated cross sections. Natural targets, Ge(Li) and NaI(T1) detectors.

Time-dependent Hartree-Fock calculations of fusion cross sections for the reactions ${}^{16}O$ + ${}^{16}O$ and ${}^{40}{Ca}$ + ${}^{40}{Ca}$

S. J. Krieger and K. T. R. Davies

Phys. Rev. C 18, 2567 (1978) - Published 1 December, 1978

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We have calculated total fusion cross sections for the reactions ${}^{16}O$ + ${}^{16}O$ and ${}^{40}{Ca}$ + ${}^{40}{Ca}$ using time-dependent Hartree-Fock theory in the rotating frame approximation. The full Skyrme potential has been employed, and neutrons and protons have been treated separately in the calculations. The results show that the fusion cross sections for the ${}^{40}{Ca}$ + ${}^{40}{Ca}$ system at low bombarding energy are greatly enhanced by the elimination of the previously enforced neutron-proton symmetry. Approximate inclusion of the Coulomb exchange term does not affect the results in either of the light systems studied. The results are in semiquantitative agreement with experiment, and the sensitivity of the calculations to the effective interaction employed suggests that the discrepancy between theoretical and experimental results can be substantially reduced.

NUCLEAR REACTIONS ${}^{16}O ({}^{16}O, x)$ and ${}^{40}{Ca} ({}^{40}{Ca}, x)$ in two-dimensional, time-dependent Hartree-Fock calculations. Fusion and strongly damped collisions.

Interference effects in the reaction ${}^{48}{Ti}$ ( ${}^{16}O$ , ${}^{15}N$ ) ${}^{49}V$

G. B. Sherwood, K. A. Erb, D. L. Hanson, R. J. Ascuitto, D. A. Bromley, and J. J. Kolata

Phys. Rev. C 18, 2574 (1978) - Published 1 December, 1978

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Anomalous angular distributions measured in the ${}^{48}{Ti}$ ( ${}^{16}O$ , ${}^{15}N$ ) ${}^{49}V$ reactions, corresponding to population of a $\frac{3}{2^{-}}$ level at 0.153 MeV excitation, an $\frac{11}{2^{-}}$ level at 1.022 MeV and a $\frac{9}{2^{-}}$ level at 1.155 MeV, are analyzed by considering the interference effects of direct and indirect transfer processes. Within the weak-coupling model, the calculated population of these excited states in ${}^{49}V$ via pure two-step inelastic excitation and transfer is characterized by flat angular distributions, whereas a direct single-particle transfer yields a bell-shaped curve. Though neither of these processes taken individually is sufficient to account for the measured anomalous angular distributions associated with these levels, a coherent addition of contributions from both mechanisms results in the necessary interference. The consequent determination of the relative strengths of the competing routes indicates that the spectroscopic strengths of the directly populated single-particle components in the excited states are 2% or less.

NUCLEAR REACTIONS ${}^{48}{Ti}$ ( ${}^{16}O$ , ${}^{15}N$ ) ${}^{49}V$ ; measured $σ (θ)$ . Enriched targets, resolution 90 keV; CCBA analysis of inelastic multistep contributions to $σ (θ)$ , using particle-core model for ${}^{49}V$ .

Reaction cross section studies with ${}^{28}{Si}$ ions

L. R. Medsker, L. H. Fry, Jr., and D. C. Wilson

Phys. Rev. C 18, 2584 (1978) - Published 1 December, 1978

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The fusion-evaporation products in the ${}^{28}{Si}$ -induced reactions on ${}^{27}{Al}$ at 65-81 MeV have been studied by detecting $γ$ rays from the residual nuclei. Cross sections for two- and three-particle removal from the initial compound nucleus ${}^{55}{Co}$ are found to dominate. High spin states in the product nuclei have been investigated. Experimental reaction cross sections are compared with compound nucleus evaporation calculations.

NUCLEAR REACTION ${}^{27}{Al} ({}^{28}{Si}, χ γ)$ , $E = 65, 72, 77, and 81$ MeV; measured $σ (E_{γ}, E)$ and $γ γ$ coincidence. Deduced reaction cross sections.

Direct inelastic scattering of ${}^{14}N$ + ${}^{12}C$ in a three-dimensional time-dependent Hartree-Fock scheme

R. Y. Cusson, J. A. Maruhn, and H. W. Meldner

Phys. Rev. C 18, 2589 (1978) - Published 1 December, 1978

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Momentum space three-dimensional time-dependent Hartree-Fock (TDHF) calculations are performed for ${}^{12}C$ + ${}^{14}N$ and ${}^{16}O$ + ${}^{16}O$ collisions. The potential is the simplified Skyrme interaction which gives the single-particle potential $v_{N} (r) = - a ρ (\vec{r}) + b ρ^{2} (\vec{r})$ , and includes the direct part of the Coulomb interaction. We use a predictor corrector method to step in time and a fast Fourier transform (FFT) method to compute the kinetic energy in momentum space. Three types of events are obtained: vibrational instability scattering at low impact parameters $b$ , near orbiting at medium $b$ values, and rotational instability scattering beyond that. The discussion points out that further improvements will require a fusion window and quantal corrections for angular and energy uncertainties which go beyond the TDHF method.

NUCLEAR REACTIONS ${}^{14}N$ (112MeV)+ ${}^{12}C$ , ${}^{16}O$ (128 MeV)+ ${}^{16}O$ , calculated deflection functions using time-dependent Hartree-Fock approximation.

Evaporation residue products from reactions with ${}^{86}{Kr}$

F. Plasil, R. L. Ferguson, H. C. Britt, B. H. Erkkila, P. D. Goldstone, R. H. Stokes, and H. H. Gutbrod

Phys. Rev. C 18, 2603 (1978) - Published 1 December, 1978

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Cross sections for evaporation residue products have been measured from ${}^{86}{Kr}$ -bombardments of ${}^{65}{Cu}$ , ${}^{90}{Zr}$ , and ${}^{109}{Ag}$ at energies ranging from 366 to 716 MeV. In the ${}^{65}{Cu}$ and ${}^{90}{Zr}$ cases, experimental $σ_{ER}$ values are in agreement with predictions of statistical model deexcitation calculations in which angular-momentum-dependent fission competition has been included. The measured $σ_{ER}$ is considerably lower than the calculated value for ${}^{109}{Ag}$ + ${}^{86}{Kr}$ , but predictions are extremely sensitive to level density parameters in that case. Correlated mass-charge distributions of evaporation residue products have been measured from the reaction ${}^{65}{Cu}$ + ${}^{86}{Kr}$ at 316 and 716 MeV. At the higher energy, measured and calculated distributions are in excellent agreement with each other, and calculations are insensitive to assumptions made concerning the effect of particle emission on the angular momentum of the evaporating system. At the lower energy, measured distributions are broader than calculated ones, and the theory is sensitive to specific assumptions concerning angular-momentum removal.

NUCLEAR REACTIONS ${}^{65}{Cu}$ + ${}^{86}{Kr}$ , ${}^{90}{Zr}$ + ${}^{86}{Kr}$ , ${}^{109}{Ag}$ + ${}^{86}{Kr}$ , $E = 366 to 716$ MeV; Measured evaporation residue $σ (θ)$ . ${}^{65}{Cu}$ + ${}^{86}{Kr}$ , $E = 366 to 716$ MeV; measured mass-charge distributions of evaporation residue products.

Exact-finite-range coupled-channels Born approximation analysis of the reaction ${}^{12}C$ ( ${}^{14}N$ , ${}^{13}N$ ) ${}^{13}C$ at 100 MeV

Pierre Nagel

Phys. Rev. C 18, 2617 (1978) - Published 1 December, 1978

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The reaction ${}^{12}C$ ( ${}^{14}N$ , ${}^{13}N$ ) ${}^{13}C$ at 100 MeV is analyzed by means of an exact-finite-range coupled-channels Born-approximation code. In particular, the anomalous behavior of the $2 S \frac{1}{2}$ transition is studied with respect to possible multistep processes. It is found that these reaction mechanisms are not able to resolve the phase discrepancy between the experimental data and the finite-range distorted-wave Born-approximation predictions for the angular distribution.

NUCLEAR REACTIONS ${}^{12}C$ ( ${}^{14}N$ , ${}^{13}N$ ), $E = 100$ MeV; DWBA and CCBA finite range analysis.

Resonances in ${}^{12}C$ + ${}^{9}{Be}$

J. F. Mateja, A. D. Frawley, A. Roy, J. R. Hurd, and N. R. Fletcher

Phys. Rev. C 18, 2622 (1978) - Published 1 December, 1978

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Excitation functions for the ${}^{12}C$ + ${}^{9}{Be}$ system have been measured for the elastic, inelastic, alpha particle, and ${}^{8}{Be}$ exit channels from $E_{c . m .} = 10 to 15$ MeV. Resonances with widths of approximately 800 keV were identified at center-of-mass energies of 11.2, 11.5, 12.6, 13.8, and 14.5 MeV.

NUCLEAR REACTIONS Measured $\frac{d σ}{d Ω}$ for $E_{c . m .} = 10 to 15$ MeV for ${}^{12}C$ ( ${}^{9}{Be}$ , ${}^{9}{Be}$ )- ${}^{12}C$ (g.s., 4.43 MeV) at $θ_{c . m .} ≃ 100 ° to 151 °$ , ${}^{9}{Be}$ ( ${}^{12}C$ , ${}^{8}{Be}$ ) ${}^{13}C$ at $θ_{c . m .} ≃ 13 ° to 75 °$ , and ${}^{12}C ({}^{9}{Be}, α) {}^{17}O$ at $θ_{c . m .} ≃ 19 ° to 70 °$ . Determined energies and widths of resonant enhancements.

Comparisons of two- and three-dimensional time-dependent Hartree-Fock calculations of the reactions ${}^{16}O$ + ${}^{16}O$ and ${}^{40}{Ca}$ + ${}^{40}{Ca}$

K. T. R. Davies, H. T. Feldmeier, H. Flocard, and M. S. Weiss

Phys. Rev. C 18, 2631 (1978) - Published 1 December, 1978

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Two-dimensional and three-dimensional time-dependent Hartree-Fock calculations have been performed over a wide range of angular momenta for ${}^{16}O$ + ${}^{16}O$ at $E_{lab} = 105$ MeV and for ${}^{40}{Ca}$ + ${}^{40}{Ca}$ at $E_{lab} = 192$ MeV. In all of the two-dimensional calculations it is assumed that the nuclear system is axially-symmetric about the line joining the mass centers of the colliding ions. Two very different two-dimensional, axially-symmetric models are considered. (a) In the first case, it is assumed that after the two ions interpenetrate the moment of inertia of the system attains the rigid-body value. (b) In the second model, each single-particle wave function is assumed to be multiplied by an extra phase factor which depends upon the azimuthal angle. This model yields an irrotational fluid flow. The results of time-dependent Hartree-Fock (TDHF) calculations with both of these models are compared with each other and with three-dimensional TDHF results. It is concluded that the two-dimensional calculations reproduce reasonably well the three-dimensional results for values of the angular momentum both below and above the three-dimensional fusion window. As the laboratory bombarding energy is decreased, there is better agreement between the two- and three-dimensional calculations, including cases in which the angular momentum is within the fusion region.

NUCLEAR REACTIONS ${}^{16}O ({}^{16}O, x)$ and ${}^{40}{Ca} ({}^{40}{Ca}, x)$ in 2- and 3-dimensional time-dependent Hartree-Fock calculations. Comparisions between 2- and 3- dimensional results. Fusion and strongly damped collisions.

Uncertainties in neutron densities determined from analysis of 0.8 GeV polarized proton scattering from nuclei

L. Ray, W. Rory Coker, and G. W. Hoffmann

Phys. Rev. C 18, 2641 (1978) - Published 1 December, 1978

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The first order, spin-dependent microscopic proton-nucleus optical potential of Kerman, McManus, and Thaler is used to analyze 800 MeV polarized proton elastic differential cross section and analyzing power data for target nuclei ${}^{58}{Ni}$ , ${}^{90}{Zr}$ , ${}^{116, 124}{Sn}$ , and ${}^{208}{Pb}$ . Approximately model-independent target neutron density distributions are constructed in order to investigate the uncertainty in the deduced neutron densities resulting from the statistical error and the finite range of momentum transfer in the experimental angular distributions. Numerous other experimental and theoretical sources of error and uncertainty are considered to obtain a realistic estimate of the total error in the deduced neutron densities and their root-mean-square radii. The typical error in the root-mean-square radii is found to be ±0.07 fm. Impressive qualitative agreement is found between the deduced neutron matter densities and the corresponding densities predicted by Hartree-Fock calculations.

NUCLEAR REACTIONS Proton-nucleus scattering, $E = 0.8$ GeV; targets ${}^{58}{Ni}$ , ${}^{90}{Zr}$ , ${}^{116, 124}{Sn}$ , ${}^{208}{Pb}$ ; analyzing power; spin-dependent Kerman, McManus, and Thaler optical potential; model-independent densities; error analysis; neutron radii.

Gamma-ray study of pion-induced reactions on the nickel isotopes

H. E. Jackson, S. B. Kaufman, D. G. Kovar, L. Meyer-Schützmeister, K. E. Rehm, J. P. Schiffer, S. L. Tabor, S. E. Vigdor, T. P. Wangler, L. L. Rutledge, Jr., R. E. Segel, R. L. Burman, P. A. M. Gram, R. P. Redwine, and M. A. Yates-Williams

Phys. Rev. C 18, 2656 (1978) - Published 1 December, 1978

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The spectra of residual nuclides following 100-, 160-, and 220-MeV $π^{+}$ and $π^{-}$ bombardment of ${}^{58, 60, 62, 64}{Ni}$ have been measured by detecting prompt and, at 220 MeV, $β$ -delayed gamma rays. A wide spectrum of residual nuclides extending along the valley of stability down to Ca, is seen. Where radioactivities were measured, the total (prompt + delayed) observed cross section amounted to ≈ 900 mb. The mean number of nucleons removed increased from about 5 for the ${}^{58}{Ni}$ target to about 8 for ${}^{64}{Ni}$ . The residual nuclide spectrum depends sensitively on the target neutron excess, but is essentially independent of pion charge or pion energy in the range observed. A Monte-Carlo cascade-evaporation calculation involving an intermediate $Δ$ resonance reproduces the yield of residual nuclides far (more than about eight nucleons) removed from the target, but it fails to reproduce the yield of nearer nuclides which is a more sensitive measure of the early stages of the reaction.

NUCLEAR REACTION ${}^{58, 60, 62, 64,}{Ni} (π^{\pm}, x γ)$ , $E_{π} = 100, 160, 220$ MeV; measured prompt and $β$ -delayed $γ$ spectra; determined yields of residual nuclides and their distribution; established systematics. Enriched targets.

Production of the $Δ^{+ +}$ in the reaction $pp \to p π^{+} n$ at 800 MeV

J. Hudomalj-Gabitzsch, I. M. Duck, M. Furić, G. S. Mutchler, J. M. Clement, R. D. Felder, W. H. Dragoset, G. C. Phillips, J. C. Allred, E. V. Hungerford, B. W. Mayes, L. S. Pinsky, and T. M. Williams

Phys. Rev. C 18, 2666 (1978) - Published 1 December, 1978

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Kinematically complete data for the reaction $pp \to p π^{+} n$ at 800 MeV have been accumulated at four proton lab angles (15°, 20°, 25°, and 30°) where the cross section $\frac{d^{5} σ}{d p_{1} d Ω_{1} d Ω_{2}}$ is dominated by $Δ^{+ +}$ production. The data, spanning four momentum transfers $t_{Δ^{+ +}}$ between 0.07 and 0.3 (GeV/c) ${}^{2}{, h a v e}$ been compared to the predictions of a pion and $ρ$ exchange model with various baryonic intermediate states. The best agreement between the theoretical and experimental cross sections was obtained with the form factor range parameters $Λ_{π} = 0.78$ GeV/c and $Λ_{ρ} = 1.8$ GeV/c. The integrated $pp \to n Δ^{+ +}$ cross section was calculated to be 13.4 mb, which, in agreement with isospin predictions of the isobar model, accounts for 75% of the estimated experimental $pp \to N Δ$ cross section of 19±3 mb.

NUCLEAR REACTIONS ${}^{1}H (p, p π^{+})$ $n$ , $E = 800$ MeV; measured $\frac{d^{5} σ}{d p_{1} d Ω_{1} d Ω_{2}}$ ; Model with $π$ and $ρ$ exchanges, $Δ^{+ +}$ , $Δ^{+}$ , $N^{*}$ , and $N$ intermediate states used. Deduced: form factor range parameters $Λ_{π}$ , $Λ_{ρ}$ , and $σ_{tot}$ for $pp \to n Δ^{+ +}$ .

Elastic scattering of positive pions on ${}^{12}C$ at 49.9 MeV

M. A. Moinester, R. L. Burman, R. P. Redwine, M. A. Yates-Williams, D. J. Malbrough, C. W. Darden, R. D. Edge, T. Marks, S. H. Dam, B. M. Preedom, F. E. Bertrand, T. P. Cleary, E. E. Gross, C. A. Ludemann, M. Blecher, K. Gotow, D. Jenkins, and F. Milder

Phys. Rev. C 18, 2678 (1978) - Published 1 December, 1978

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Differential cross sections for the elastic scattering of positive pions on ${}^{12}C$ at 49.9 MeV were measured. The results differ from those deteermined by other investigators. The data are analyzed in terms of $π^{+}$ nucleus partial waves and are compared to various model calculations.

NUCLEAR REACTIONS ${}^{12}C (π^{+}, π^{+}) {}^{12}C$ . $E = 49.9$ MeV, $θ = 25 ° - 160 °$ measured $\frac{d σ}{d Ω} (θ)$ . Partial wave and optical model analyses.

Analysis of recent $π d$ elastic scattering data

M. M. Hoenig and A. S. Rinat

Phys. Rev. C 18, 2683 (1978) - Published 1 December, 1978

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We analyze recent data on $π d$ elastic scattering by means of a modified Glauber amplitude. As for the older data with $T_{π} ≲ 250$ MeV, reasonable agreement is now obtained out to the largest angles, except in part for $T_{π} = 513$ MeV. The same holds for integrated elastic and total cross sections. By comparing relativistic three-body and Glauber amplitudes, we conclude that the agreement is not accidental. We reconfirm that for the lower energies, the relative weakness of the $π N$ interaction and the large $pn$ separation in the deuteron cause rapid convergence for all angles.

NUCLEAR REACTIONS Theoretical analysis of $d (π, π) d$ for $234 < T_{π} (MeV) < 513$ , Calculated: differential and total cross sections.

Decay of neutron-deficient ${}^{103}{In}$ and ${}^{103}{Cd}$ isotopes

G. Lhersonneau, G. Dumont, K. Cornelis, M. Huyse, and J. Verplancke

Phys. Rev. C 18, 2688 (1978) - Published 1 December, 1978

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The decays of neutron-deficient ${}^{103}{In}$ and ${}^{103}{Cd}$ have been investigated. Sources were produced by ( ${}^{14}N$ , $y p - x n$ ) reactions on a natural Mo target. Singles spectra and various coincidence spectra involving $γ$ rays, x rays, positrons, and conversion electrons have been performed on mass separated samples. The newly discovered activity ${}^{103}{In}$ ( $T_{\frac{1}{2}} = 1.08 \pm 0.11$ min) was found to populate mainly the $\frac{7}{2^{+}}$ excited ${}^{103}{Cd}$ state at 188 keV. About 200 lines were attributed to the 7.3 min ${}^{103}{Cd}$ decay. Coincidence relationships are given. A level scheme of ${}^{103}{Ag}$ is proposed.

RADIOACTIVITY ${}^{103}{In}$ , ${}^{103}{Cd}$ from Mo ( ${}^{14}N$ , $yp xn$ ) measured $E_{γ}$ , $I_{γ}$ , $γ γ$ coin, $E_{β}$ ${}^{103}{Cd}$ and ${}^{103}{Ag}$ deduced levels $α_{k}$ , $J$ , $π$ natural target, mass separation Ge (Li), Si (Li) detectors.

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Physical Review C

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${}^{74}{Ge} (t, p) {}^{76}{Ge}$ reaction

Multiplet structure in ${}^{203}{Pb}$

${}^{59}{Ni} (t, p) {}^{61}{Ni}$ reaction

Level and decay scheme studies in ${}^{92}{Zr}$ and ${}^{94}{Zr}$ via ( $n, n^{'} γ$ ) reactions

The nuclear excitation rate for low-lying excited states in ${}^{237}U$ and ${}^{238}U$

Upper limits for the ${}^{27}{Al}$ + ${}^{16}O$ and ${}^{93}{Nb}$ + ${}^{16}O$ radiative-capture cross sections

Time-dependent Hartree-Fock calculations of fusion cross sections for the reactions ${}^{16}O$ + ${}^{16}O$ and ${}^{40}{Ca}$ + ${}^{40}{Ca}$

Interference effects in the reaction ${}^{48}{Ti}$ ( ${}^{16}O$ , ${}^{15}N$ ) ${}^{49}V$

Reaction cross section studies with ${}^{28}{Si}$ ions

Direct inelastic scattering of ${}^{14}N$ + ${}^{12}C$ in a three-dimensional time-dependent Hartree-Fock scheme

Evaporation residue products from reactions with ${}^{86}{Kr}$

Exact-finite-range coupled-channels Born approximation analysis of the reaction ${}^{12}C$ ( ${}^{14}N$ , ${}^{13}N$ ) ${}^{13}C$ at 100 MeV

Resonances in ${}^{12}C$ + ${}^{9}{Be}$

Comparisons of two- and three-dimensional time-dependent Hartree-Fock calculations of the reactions ${}^{16}O$ + ${}^{16}O$ and ${}^{40}{Ca}$ + ${}^{40}{Ca}$

Uncertainties in neutron densities determined from analysis of 0.8 GeV polarized proton scattering from nuclei

Gamma-ray study of pion-induced reactions on the nickel isotopes

Production of the $Δ^{+ +}$ in the reaction $pp \to p π^{+} n$ at 800 MeV

Elastic scattering of positive pions on ${}^{12}C$ at 49.9 MeV

Analysis of recent $π d$ elastic scattering data

Decay of neutron-deficient ${}^{103}{In}$ and ${}^{103}{Cd}$ isotopes

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