Recent Articles

Comparison of methods of scattering from two potentials

W. R. Gibbs

Phys. Rev. C 10, 2166 (1974) - Published 1 December, 1974

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Several approximations to multiple scattering are compared with an exact calculation. The model chosen for comparison is scattering from two Gaussian potentials of range 0.5 fm and depth 16 ${fm}^{- 2}$ . Particular attention is paid to the case of overlapping potentials. It is shown that, of all approximations considered, only the separable potential method is capable of giving good agreement in this region. It is demonstrated that a separable potential can always be chosen to give the exact answer for multiple scattering in the case in which the (spherically symmetric) interaction regions are nonoverlapping as well as when the interaction regions are concentric.

New high-spin state at 3.95 MeV in ${}^{19}O$

H. T. Fortune and H. G. Bingham

Phys. Rev. C 10, 2174 (1974) - Published 1 December, 1974

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Extension of the effective range theory off the energy shell

D. J. Ernst, C. M. Shakin, and R. M. Thaler

Phys. Rev. C 10, 2176 (1974) - Published 1 December, 1974

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The effective range theory is generalized. The leading terms in the expansion of the off-shell $K$ matrix, $〈 p | K (s^{2}) | q 〉$ , about its value at a point $p = q = q_{0}$ , $s = s_{0}$ , are expressed in terms of the off-shell wave functions which are solutions of the "off-shell" Lippmann-Schwinger equation. It is shown that this procedure gives the usual effective range result in the case that $q_{0} = s_{0}$ . The simplification which occurs for an expansion about an on-shell point is discussed. The necessary modification introduced by energy dependent interactions are also given.

${}^{39}K (p, d) {}^{38}K$ reaction at $E_{p} = 35$ Mev

B. H. Wildenthal, J. A. Rice, and B. M. Preedom

Phys. Rev. C 10, 2184 (1974) - Published 1 December, 1974

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The ${}^{39}K (p, d) {}^{38}K$ reaction at $E_{p} = 35$ MeV. has been used to study the properties of states in ${}^{38}K$ up to an excitation energy of 6 MeV. An experimental resolution of 10 keV (full width at half-maximum) made it possible to detect many heretofore unobserved states. Excitation energies of observed states are determined to an accuracy of 1-4 keV. Angular distributions were measured for many of the transitions, and for these states assignment of $l_{n}$ values and extraction of spectroscopic factors is made. The results are compared to previous experiments and to current shell-model calculations.

NUCLEAR REACTIONS ${}^{39}K (p, d)$ , $E_{p} = 35$ MeV; measured $σ (E_{d}, θ)$ ; deduced $Q$ value, excitation energies, $l_{n}$ values, and spectroscopic factors for states of ${}^{38}K$ . Natural target.

Off-shell $T$ matrices for a class of separable nonlocal potentials

B. Bagchi and B. Mulligan

Phys. Rev. C 10, 2197 (1974) - Published 1 December, 1974

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In an earlier paper we considered scattering of all partial waves from a wide class of separable nonlocal potentials, and obtained in configuration space exact analytic solutions for the wave functions and phase shifts. In this paper these solutions are used to construct exact expressions for the half-off-shell and off-shell $T$ matrices for this class of potentials. As an illustration, we compare the off-shell $T$ matrix for the one-term Yamaguchi potential calculated by the method presented here with the expression obtained by standard techniques.

NUCLEAR REACTIONS Off-shell $T$ matrices. Separable nonlocal potentials.

Separable expansion for the nuclear form factors

M. A. Nagarajan and W. L. Wang

Phys. Rev. C 10, 2206 (1974) - Published 1 December, 1974

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We apply the techniques of the Fourier-Bessel series to obtain a separable expansion of the (local) nuclear form factors in the momentum space. The accuracy of the expansion is studied for a Woods-Saxon and a derivative Woods-Saxon density distribution. The technique will be useful in many nuclear scattering calculations.

Contributions to the nucleon-nucleon interaction determined from $π - π$ phase shifts

F. E. Riewe, M. L. Nack, and A. E. S. Green

Phys. Rev. C 10, 2210 (1974) - Published 1 December, 1974

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A nonrelativistic description of the nucleon-nucleon interaction is presented which uses only currently known mesons. The model differs from previous ones in that it uses realistic potentials with all parameters determined directly from experiment except the coupling constants and form-factor parameters. Dipole form factors are used to describe all meson-nucleon interactions. The generalized one-boson-exchange potential utilizes the $π$ , $η$ , $ω$ , and $δ$ mesons, and the resonances extracted from the $δ_{0}^{0}$ and $δ_{1}^{1}$ $π - π$ phase shift $δ_{l}^{I}$ data. The $π$ , $η$ , $ω$ , and $δ$ are represented by zero-width propagators, where we assume their spectral functions or mass squared distributions are approximated by $δ (m^{2} - m_{r}^{2})$ for a particle of mass $m_{r}$ . The detailed prescription of Nack, Ueda, and Green is used for obtaining spectral functions from $δ_{0}^{0}$ and $δ_{1}^{1}$ and their corresponding finite width propagators. Three $δ_{0}^{0}$ solutions are considered—the $ε$ up solution, $ε$ down solution, and the $S^{*}$ . Both the Baton and Scharenguivel solutions for $δ_{1}^{1}$ are considered for the $ρ$ . Fitting the models to $N - N$ phase-shift data indicates a slight preference for the $ε$ down solution, but does not differentiate between solutions for the $ρ$ .

Semiclassical model for pion production by neutrons on nuclei

D. A. Sparrow, Morton M. Sternheim, and Richard R. Silbar

Phys. Rev. C 10, 2215 (1974) - Published 1 December, 1974

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The semiclassical model for pion production by protons has been extended to neutron production. Calculations of the production by both neutrons and protons incident upon Al, Cu, and Pb agree well with experiment. The pion absorption cross sections in nuclear matter deduced from each of the six experiments are reasonably consistent with one another.

Three-body photodisintegration of ${}^{3}{He}$

B. L. Berman, S. C. Fultz, and P. F. Yergin

Phys. Rev. C 10, 2221 (1974) - Published 1 December, 1974

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The photoneutron cross section for ${}^{3}{He}$ has been measured from threshold to 30 MeV using monochromatic photons from positron annihilation in flight. The cross section reaches its maximum of about 0.95 mb at about 15 MeV. Several distinct structures are apparent, some correlated with observed fore-aft asymmetry of the photoneutrons. The integrated cross section is 13.0 MeV mb, and the $\frac{1}{E}$ integrated cross section is 0.77 mb. With reasonable extrapolations to higher energies this is consistent with sum-rule predictions, well within experimental uncertainties. Current theoretical calculations are capable of accounting for the over-all size and shape of the cross section, but not for the fine details of the present measurement.

NUCLEAR REACTIONS ${}^{3}{He} (γ, n)$ , $E = 7.7 - 30.2$ MeV; measured $σ (E)$ , fore-aft photoneutron asymmetry with monoenergetic photons.

Measurements of the proton total reaction cross section for light nuclei between 20 and 48 MeV

W. F. McGill, R. F. Carlson, T. H. Short, J. M. Cameron, J. Reginald Richardson, I. Šlaus, W. T. H. van Oers, J. W. Verba, D. J. Margaziotis, and P. Doherty

Phys. Rev. C 10, 2237 (1974) - Published 1 December, 1974

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Measurements of proton total reaction cross sections for ${}^{9}{Be}$ , C, ${}^{19}F$ , ${}^{27}{Al}$ , and Si have been made in the energy range 20 to 48 MeV. These measurements were made using a variation of a standard attenuation technique. The cross sections are compared with various theoretical predictions.

NUCLEAR REACTIONS ${}^{9}{Be}$ , C, ${}^{19}F$ , ${}^{27}{Al}$ , Si; $20 MeV < T < 48 MeV$ , between 8 and 14 measurements for each nucleus, measured: $σ_{R}$ ; natural targets.

Elastic scattering of negative pions from ${}^{16}O$ and Ca in the 3,3 resonance region

M. Blecher, K. Gotow, D. K. Anderson, R. Kerns, R. Minehart, K. Ziock, R. W. Bercaw, J. S. Vincent, and R. Johnson

Phys. Rev. C 10, 2247 (1974) - Published 1 December, 1974

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The elastic scattering cross sections for $π^{-} - {}^{16}O$ and $π^{-} - Ca$ have been measured at pion kinetic energies 160, 170, 220, 230, and 240 MeV for ${}^{16}O$ , and at 205 and 215 MeV for Ca. The results are analyzed in terms of the Kisslinger and Laplacian optical model potentials and the obtained potential parameters are compared with the impulse approximation result.

NUCLEAR REACTIONS $Ca (π, π)$ , $O (π, π)$ , $E = 160 - 240$ MeV; measured $σ (E, θ)$ ; deduced optical-model parameters. Natural target, resolution 3 MeV; $θ = 15 - 70$ , $Δ θ = 2 °$ .

Excitation of $M 1$ and $M 2$ states in ${}^{22}{Ne}$ by 180° electron scattering

X. K. Maruyama, R. A. Lindgren, W. L. Bendel, E. C. Jones, Jr., and L. W. Fagg

Phys. Rev. C 10, 2257 (1974) - Published 1 December, 1974

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States in ${}^{22}{Ne}$ have been studied by 180° inelastic electron scattering with incident energies of 37, 50, and 60 MeV. Prominent magnetic dipole and quadrupole states are observed below 13 MeV excitation energy. Reduced transition probabilities, transition radii, and spin and parity assignments are presented for these states and compared to shell model calculations.

NUCLEAR REACTIONS ${}^{22}{Ne} (e, e^{'})$ , $E = 37, 50, and 60$ ; measured $σ (E, 180 °)$ ; measured $B (M 1)$ ; deduced $J^{π}$ ; enriched target.

Determination of $B (E 2, 0^{+} \to 2^{+'})$ for some even-even nuclei in and near the rare-earth region

C. Baktash, J. X. Saladin, J. O'Brien, I. Y. Lee, and J. E. Holden

Phys. Rev. C 10, 2265 (1974) - Published 1 December, 1974

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$α$ particles in the 11.5-13.5 MeV energy range have been employed to Coulomb excite the $2^{+}$ members of the $γ$ -vibrational band of nine even-even nuclei in the $158 \leq A \leq 186$ mass region. The $B (E 2, 0^{+} \to 2^{+'})$ values were then determined by energy analyzing the backscattered projectiles. The results for ${}^{158, 160}{Gd}$ , ${}^{162, 164}{Dy}$ , ${}^{166, 168, 170}{Er}$ , and ${}^{184, 186}W$ are 0.106 ± 0.015, 0.104 ± 0.004, 0.130 ± 0.005, 0.121 ± 0.005, 0.140 ± 0.006, 0.130 ± 0.005, 0.107 ± 0.006, 0.138 ± 0.006, and 0.139 ± 0.004 ( $e^{2} b^{2}$ ), respectively.

NUCLEAR REACTIONS ${}^{158, 160}{Gd}$ , ${}^{162, 164}{Dy}$ , ${}^{166, 168, 170}{Er} (α, α^{'})$ , $E = 11.0 - 12.5$ ; ${}^{184, 186}W (α, α^{'})$ , $E = 13.25 - 13.5$ MeV; measured $\frac{σ (E_{α^{'}})}{σ (E_{α})}$ at $θ_{lab} = 140 °, \sim 170.5 °$ ; deduced $B (E 2, 0^{+} \to 2^{+'})$ . Enriched targets.

Nuclear reactions of silver with 11.5-GeV protons

G. English, N. T. Porile, and E. P. Steinberg

Phys. Rev. C 10, 2268 (1974) - Published 1 December, 1974

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The interaction of silver with 11.5-GeV protons was studied and formation cross sections of 72 radionuclides were determined by direct assay of the target with a Ge(Li) $γ$ -ray spectrometer followed by computer analysis of the spectra. The data were used to construct charge-dispersion and mass-yield curves. Comparison with previous radiochemical studies performed with 29-GeV protons indicates good agreement between the two techniques. The data are compared with Rudstam systematics. This formulation preducts a much steeper decrease in isobaric cross sections with decreasing $A$ than is observed experimentally.

NUCLEAR REACTIONS Ag + 11.5-GeV protons; measured $σ$ for formation of 72 nuclides ranging from ${}^{7}{Be}$ to ${}^{106}{Ag}^{m}$ ; deduced charge dispersions and mass yield curve.

Nuclear reactions of silver with 300-GeV protons

G. English, Y. W. Yu, and N. T. Porile

Phys. Rev. C 10, 2281 (1974) - Published 1 December, 1974

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The interaction of silver with 300-GeV protons was studied and compared with that of 11.5-GeV protons. Cross section ratios, $\frac{σ_{300}}{σ_{11.5}}$ , were determined for 74 nuclides ranging from ${}^{7}{Be}$ to ${}^{106}{Ag}^{m}$ . The weighted average value of $\frac{σ_{300}}{σ_{11.5}}$ is 1.01±0.10. A detailed examination of the dependence of the ratios on product $A$ and $\frac{N}{Z}$ reveals that the only difference occurs in the $A \sim 20 - 30$ mass region, where a 17±5% increase in cross sections is observed at 300 GeV.

NUCLEAR REACTIONS Ag + 300-GeV protons; measured $σ$ for formation of 74 nuclides ranging from ${}^{7}{Be}$ to ${}^{108}{Ag}^{m}$ ; compared with corresponding $σ$ at 11.5 GeV.

One-quasiparticle states in ${}^{163, 165}{Ho}$ observed in the ( ${}^{3}{He}, d$ ) and ( $α, t$ ) reactions

D. A. Lewis, A. S. Broad, and W. S. Gray

Phys. Rev. C 10, 2286 (1974) - Published 1 December, 1974

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The ( ${}^{3}{He}, d$ ) and ( $α, t$ ) stripping reactions on ${}^{162}{Dy}$ and ${}^{164}{Dy}$ have been studied at bombarding energies of 46.5 and 45.5 MeV, respectively. Angular distributions for the ( ${}^{3}{He}, d$ ) reaction were measured over the angular range 0-35°. The experimental resolution of approximately 15 keV full width at half-maximum was sufficient to permit extraction of $l$ transfers and spectroscopic factors for 32 levels in ${}^{163}{Ho}$ and ${}^{165}{Ho}$ below 1.6 MeV of excitation, using the conventional distorted-wave Born approximation (DWBA). Previous identification from decay studies of the ${\frac{7}{2}}^{-} [523]$ , ${\frac{1}{2}}^{+} [411]$ , and ${\frac{3}{2}}^{+} [411]$ bands in both nuclei, and the ${\frac{1}{2}}^{-} [541]$ band in ${}^{163}{Ho}$ , were confirmed. New assignments include the ${\frac{5}{2}}^{+} [402]$ and ${\frac{9}{2}}^{-} [514]$ bands in ${}^{163}{Ho}$ and the ${\frac{1}{2}}^{-} [541]$ and ${\frac{1}{2}}^{+} [660]$ bands in ${}^{165}{Ho}$ . Also the $K = \frac{5}{2}$ band beginning at 1056 keV in ${}^{165}{Ho}$ has been identified as the ${\frac{5}{2}}^{+} [402]$ band, in contradiction to a tentative previous assignment from decay work. A few additional levels were observed which could not be positively identified with predicted Nilsson-model states. These include a level populated by $l = 0$ transfer and another with $l = 2$ in each isotope, in the 1.1-1.6-MeV excitation region. The presence of these transitions and their spectroscopic factors suggest fragmentation of the ${\frac{1}{2}}^{+} [400]$ and possibly the ${\frac{3}{2}}^{+} [402]$ orbitals. The measured elastic scattering is adequately represented by coupled-channels calculations, but not optical model predictions, when potential parameters derived from the lead region are used. With these parameters the DWBA yields spectroscopic factors which are in qualitative agreement with Nilsson-model predictions, although the over-all pattern of agreement is somewhat improved if the absolute values are reduced by 30-40%. The measured angular distributions are generally well reproduced by the DWBA except for the transition to the ${\frac{5}{2}}^{-}$ member of the ${\frac{1}{2}}^{-} [541]$ band in both nuclei. No other indications of possible indirect contributions to the reactions, which have been observed in neutrontransfer reactions at lower energies, were apparent in comparison with DWBA predictions.

NUCLEAR REACTIONS ${}^{162, 164}{Dy} ({}^{3}{He}, d)$ , $E = 46.5$ MeV; measured $σ (E_{σ}, θ)$ , $θ = 0 - 35 °$ , $Δ θ = 2.5 °$ . ${}^{162, 164}{Dy} (α, t)$ , $E = 45.5$ MeV, measured $E_{t}$ . ${}^{163, 165}{Ho}$ deduced levels, $l$ , $J$ , $π$ , $S$ . Enriched targets, DWBA analysis, resolution 15 keV, magnetic spectrograph. ${}^{162}{Dy}$ ( ${}^{3}{He}$ , ${}^{3}{He}$ ), $E = 46.5$ MeV, measured $σ (E_{He}, θ)$ . ${}^{166}{Er} (d, d)$ , $E = 34.5$ MeV, measured $σ (E_{d}, θ)$ . Enriched targets, coupled-channel analysis.

Elastic and inelastic scattering of 12.0-MeV protons from ${}^{84, 86}{Kr}$

B. K. Arora, D. K. Olsen, P. J. Riley, and C. P. Browne

Phys. Rev. C 10, 2301 (1974) - Published 1 December, 1974

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Differential cross sections for elastic and inelastic scattering of 12.0-MeV protons from ${}^{84}{Kr}$ and ${}^{86}{Kr}$ have been measured. Optical-model parameters obtained from the elastic cross sections were used in distorted-wave-Born-approximation and coupled-channel calculations in order to determine the spin, parities, and deformation parameters of excited states. The deformation parameters found are $β_{2} = 0.128 and 0.108$ for the first $2^{+}$ states in ${}^{84}{Kr}$ and ${}^{86}{Kr}$ , respectively, and are $β_{3} = 0.158 and 0.145$ , respectively, for the first $3^{-}$ states. Most of the scattering strength to the "two-phonon" states proceed through their one-phonon components. The spins of several higher excited states are suggested.

NUCLEAR REACTIONS ${}^{84, 86}{Kr} (p, p^{'})$ , $E = 12.0$ MeV; measured $σ (θ)$ and level energies; deduced optical-model parameters, $J^{π}$ and $β$ from DWBA and coupled channels.

Nuclear spectroscopy with lithium beams. I. High-spin states in ${}^{55}{Fe}$ , ${}^{55}{Mn}$ , and ${}^{53}{Cr}$

A. R. Poletti, B. A. Brown, D. B. Fossan, and E. K. Warburton

Phys. Rev. C 10, 2312 (1974) - Published 1 December, 1974

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The ${}^{7}{Li}$ bombardment of ${}^{51}V$ has been used in conjuction with recoil distance lifetime (RDM), $γ - γ$ coincidence, angular distribution, and Doppler shift attenuation lifetime (DSAM) measurements to gain information on the properties of high-spin states in the nuclei ${}^{55}{Fe}$ , ${}^{55}{Mn}$ , and ${}^{53}{Cr}$ . Mean lifetimes ( $τ$ ) determined by RDM were as follows—in ${}^{55}{Fe}$ : 1409-keV level ( $τ = 57.8 \pm 3.5$ psec), 2813 (14.5±3.1 psec), 5099 (32.3±1.1 psec); in ${}^{55}{Mn}$ : 126-keV level ( $τ = 382 \pm 16$ psec); in ${}^{53}{Cr}$ : 2173-keV level ( $τ = 47 \pm 15$ psec); 3084 ( $τ = 43 \pm 15$ psec). Tentative spin assignments were made as follows—in ${}^{55}{Fe}$ : 5099-keV level $J = (\frac{19}{2})$ , 6528, $J = (\frac{21}{2})$ , in ${}^{55}{Mn}$ : 3056-keV level $J = (\frac{15}{2})$ . Lifetimes (or limits) were also established from DSAM measurements for a number of other levels in the above nuclei. The results are compared to shell model calculations.

NUCLEAR REACTIONS ${}^{51}V ({}^{7}{Li}, 3 n)$ , ${}^{51}V ({}^{7}{Li}, p 2 n)$ , ${}^{51}V ({}^{7}{Li}, α n)$ $E = 25$ MeV; measured $γ γ$ coin.; deduced levels in ${}^{55}{Fe}$ , ${}^{55}{Mn}$ , ${}^{53}{Cr}$ ; measured $σ (E_{γ}, θ)$ ; deduced $J^{π}$ for high spin states; measured recoil distance; deduced $T_{\frac{1}{2}}$ , $B (E 2)$ , effective charges. Natural target, Ge(Li) detectors.

Nuclear spectroscopy with lithium beams. II. High-spin states in ${}^{52}{Cr}$ , ${}^{54}{Mn}$ , ${}^{54}{Fe}$ , and ${}^{56}{Fe}$

A. R. Poletti, B. A. Brown, D. B. Fossan, and E. K. Warburton

Phys. Rev. C 10, 2329 (1974) - Published 1 December, 1974

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The nuclei ${}^{52}{Cr}$ , ${}^{54}{Mn}$ , and ${}^{56}{Fe}$ have been investigated using ${}^{7}{Li}$ bombardment of ${}^{51}V$ at about 25 MeV bombarding energy. Further information has been obtained on the nuclei ${}^{54}{Mn}$ and ${}^{54}{Fe}$ from the ${}^{6}{Li}$ bombardment of ${}^{51}V$ at the same energy. Experimental methods used included recoil distance lifetime measurements (RDM), $γ - γ$ coincidence measurements, angular distribution measurements, and Doppler shift attenuation lifetime measurements (DSAM) on $γ$ rays from high spin states in the various nuclei. Mean lifetimes determined by RDM were as follows: in ${}^{52}{Cr}$ , 3114-keV level ( $τ = 60.0 \pm 2.6$ psec); in ${}^{54}{Mn}$ , 156-keV level ( $τ = 278_{- 120}^{+ 40}$ psec); 368 keV (10.4 ± 1.6 psec); 1073 keV (292 ± 50 psec); in ${}^{56}{Fe}$ , 847-keV level ( $τ = 7.9 \pm 1.2$ psec). Tentative spin assignments were made as follows: in ${}^{52}{Cr}$ , 4751-keV level, $J = (8)$ (this state can be identified with the seniority 4, $J^{π} = 8^{+}$ state predicted in this region); in ${}^{54}{Mn}$ , 1073-keV level $J = (6)$ ; in ${}^{56}{Fe}$ , 3389-keV level $J = (6)$ . Decay schemes observed in these nuclei are presented. Lifetimes (or limits) were also established from DSAM measurements for a number of other levels in these nuclei. Recent shell model calculations for these nuclei are discussed.

NUCLEAR REACTIONS ${}^{51}V ({}^{7}{Li}, α 2 n) {}^{52}{Cr}$ , ${}^{51}V ({}^{7}{Li}, p 3 n) {}^{54}{Mn}$ , ${}^{51}V ({}^{7}{Li}, 4 n) {}^{54}{Fe}$ , ${}^{51}V ({}^{7}{Li}, 2 n) {}^{56}{Fe}$ , ${}^{51}V ({}^{6}{Li}, p 2 n) {}^{54}{Mn}$ , ${}^{51}V ({}^{6}{Li}, 3 n) {}^{54}{Fe}$ $E = 25$ MeV; measured $γ - γ$ coin.; deduced levels in ${}^{52}{Cr}$ , ${}^{54}{Mn}$ , ${}^{54}{Fe}$ , ${}^{56}{Fe}$ ; measured $σ (E_{γ}, θ)$ ; deduced $J^{π}$ for high-spin states; measured recoil distance; deduced $T_{\frac{1}{2}}$ , $B (E 2)$ . Natural target, Ge(Li) detectors.

Channel correlations of the compound-nuclear decay in the presence of a doorway-state reaction mechanism

G. Graw, H. Clement, J. H. Feist, W. Kretschmer, and P. Pröschel

Phys. Rev. C 10, 2340 (1974) - Published 1 December, 1974

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Inelastic reactions that proceed via a doorway-state mechanism, e.g. an isobaric analog resonance (IAR), have a complete correlation of the fluctuations of the scattering matrix elements between resonant channels if, in these channels, other mechanisms of compound-nucleus formation can be neglected. Then the polarization $P (θ)$ of the resonant fluctuating cross section is energy independent and the same as for the resonant direct decay. This is supported by the analysis of experimental data for $σ (θ)$ , $A (θ)$ , and $P (θ)$ for the ${}^{90}{Zr} (p, p_{2}) {}^{90}{Zr}$ ( $2^{+}$ ,2.18 MeV) reaction at $E_{p} = 7.65$ MeV in an IAR with $J^{π} = {\frac{3}{2}}^{+}$ .

NUCLEAR REACTION ${}^{90}{Zr} (p, p^{'} γ) {}^{90}{Zr}$ ( $2^{+}$ , 2.18 MeV), measured $σ (θ)$ , $A (θ)$ , $P (θ)$ for $θ = 60 ° - 170 °$ at $E_{p} = 7.65$ MeV. Enriched target, resolution 20 keV. Deduced: (1) structure of the ${\frac{3}{2}}^{+}$ state at $E_{x} = 2.94$ MeV of ${}^{91}{Zr}$ ; (2) strong correlation of the fluctuation between resonant channels.

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Physical Review C

Recent Articles

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Recent Issues

Comparison of methods of scattering from two potentials

New high-spin state at 3.95 MeV in ${}^{19}O$

Extension of the effective range theory off the energy shell

${}^{39}K (p, d) {}^{38}K$ reaction at $E_{p} = 35$ Mev

Off-shell $T$ matrices for a class of separable nonlocal potentials

Separable expansion for the nuclear form factors

Contributions to the nucleon-nucleon interaction determined from $π - π$ phase shifts

Semiclassical model for pion production by neutrons on nuclei

Three-body photodisintegration of ${}^{3}{He}$

Measurements of the proton total reaction cross section for light nuclei between 20 and 48 MeV

Elastic scattering of negative pions from ${}^{16}O$ and Ca in the 3,3 resonance region

Excitation of $M 1$ and $M 2$ states in ${}^{22}{Ne}$ by 180° electron scattering

Determination of $B (E 2, 0^{+} \to 2^{+'})$ for some even-even nuclei in and near the rare-earth region

Nuclear reactions of silver with 11.5-GeV protons

Nuclear reactions of silver with 300-GeV protons

One-quasiparticle states in ${}^{163, 165}{Ho}$ observed in the ( ${}^{3}{He}, d$ ) and ( $α, t$ ) reactions

Elastic and inelastic scattering of 12.0-MeV protons from ${}^{84, 86}{Kr}$

Nuclear spectroscopy with lithium beams. I. High-spin states in ${}^{55}{Fe}$ , ${}^{55}{Mn}$ , and ${}^{53}{Cr}$

Nuclear spectroscopy with lithium beams. II. High-spin states in ${}^{52}{Cr}$ , ${}^{54}{Mn}$ , ${}^{54}{Fe}$ , and ${}^{56}{Fe}$

Channel correlations of the compound-nuclear decay in the presence of a doorway-state reaction mechanism

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