Recent Articles

Gamow-state analysis of ${}^{54}{Fe} (d, n)$ to proton resonances in ${}^{55}{Co}$

W. R. Coker

Phys. Rev. C 9, 784 (1974) - Published 1 February, 1974

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Distorted-wave Born-approximation (DWBA) calculations are performed for ${}^{54}{Fe} (d, n)$ angular distributions at 10 MeV populating five proton resonances in ${}^{55}{Co}$ , at 5.17, 5.54, 5.74, 5.86, and 6.07 MeV excitation, using Gamow states as form factors. Results of the calculations are compared with previous DWBA analyses in which bound-state functions were used.

[NUCLEAR REACTIONS ${}^{54}{Fe} (d, n)$ , $E = 10.0$ MeV; calculated $σ (θ)$ ; deduced proton-unbound ${}^{55}{Co}$ levels, $J$ , $π$ .]

Mechanisms in the reactions ${}^{3}H$ + ${}^{3}{He}$ and ${}^{3}H$ + ${}^{2}H$ and measurement of the reaction ${}^{3}H (p, {}^{3}{He}) n$ from 13.6 to 32.8 MeV

R. G. Allas, L. A. Beach, R. O. Bondelid, E. M. Diener, E. L. Petersen, J. M. Lambert, P. A. Treado, and I. Šlaus

Phys. Rev. C 9, 787 (1974) - Published 1 February, 1974

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The angular distribution of the ${}^{3}H (p, {}^{3}{He}) n$ reaction cross section is measured at $E_{p} = 13.6, 14.8, 18.0, 21.0, 24.0, 27.0, 30.0, and 32.8$ MeV with an estimated absolute uncertainty of 8%. Such data are necessary in the study of quasifree processes, which frequently are hampered by the lack of cross-section data of the corresponding free processes. Normalization to existing $E_{p} = 13.6$ -MeV data shows that the ${}^{3}H$ content of the target is 1.7 times less than given by the supplier. Using these new measurements, the ${}^{3}H$ + ${}^{3}{He}$ and ${}^{3}H$ + ${}^{2}H$ quasifree reactions are reanalyzed.

[NUCLEAR REACTIONS ${}^{3}H (p, {}^{3}{He})$ , $E = 13.6 - 32.8$ MeV; measured $σ (E_{p}; θ)$ . Determined ${}^{3}H$ content of target, reanalyzed ${}^{3}H$ + ${}^{3}{He}$ , ${}^{3}H$ + ${}^{2}H$ quasifree reactions.]

Statistical-model analysis of gamma-ray angular distributions following the ${}^{48}{Ti} (p, p^{'}) {}^{48}{Ti}$ reaction at $E_{p} = 5.0$ MeV

T. T. Bardin, J. A. Becker, and T. R. Fisher

Phys. Rev. C 9, 790 (1974) - Published 1 February, 1974

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Angular distributions of several $γ$ -ray transitions following the reaction ${}^{48}{Ti} (p, p^{'}) {}^{48}{Ti}$ were measured at $E_{p} = 5.0$ MeV. The $γ$ radiation was detected in a 37- ${cm}^{3}$ Ge(Li) counter at angles $θ_{γ}$ between 0 and 90° to the incident beam direction. Relative cross sections and $γ$ -ray angular distributions were compared with predictions of the compound-nucleus model for the transitions 2.29→0.98, 2.42→0, 2.42→0.98, 3.22→0.98, 3.22→2.29, 3.36→0.98, and 3.37→0.98. Reasonable agreement was found, except in the case of the 2.42-MeV level.

[NUCLEAR REACTIONS ${}^{48}{Ti} (p, p^{'})$ ; $E = 5.0$ MeV; measured $σ (E_{γ}, θ)$ ; compared with calculated $σ (E_{γ}, θ)$ .]

New mass-table parameters for nuclei $Z \leq 16$

C. Thibault and R. Klapisch

Phys. Rev. C 9, 793 (1974) - Published 1 February, 1974

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Recent measurements of the masses of ${}^{11}{Li}$ and ${}^{14}B$ and a better fitting procedure result in a new set of parameters for the Garvey et al. mass table. A better agreement is obtained for the limit of stability as ${}^{14}{Be}$ and ${}^{19}C$ are now predicted to be bound.

[NUCLEAR STRUCTURE Calculated mass excesses of nuclei $Z \leq 16$ , $N \geq Z$ . Garvey-Kelson transverse relations.]

Measurement of the radiative width of the 12.71-MeV level in ${}^{12}C$

F. E. Cecil, L. W. Fagg, W. L. Bendel, and E. C. Jones, Jr

Phys. Rev. C 9, 798 (1974) - Published 1 February, 1974

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The ground-state magnetic dipole transition width of the $1^{+}$ level at 12.71 MeV in ${}^{12}C$ has been measured to be 0.34±0.05 eV. This value is used to calculate the total width of the level based on a previous measurement of the relative ground-state $γ$ width. A total width of 14.6±2.6 eV is thus calculated. A model-dependent measurement of the isospin mixing between this level and the 15.11-MeV level yields the values $β = 0.19 \pm 0.01$ or 0.05±0.01.

[NUCLEAR REACTION ${}^{12}C (e, e^{'})$ $p = 50.5 \frac{MeV}{c}$ ; levels measured $Γ (Λ)$ ; deduced isospin mixing.]

Spins of the 3.854-MeV and 7.026-MeV levels in ${}^{17}F$ from ${}^{16}O (\vec{p}, p) {}^{16}O$

S. E. Darden and H. R. Hiddleston

Phys. Rev. C 9, 800 (1974) - Published 1 February, 1974

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The spin and parity of the 7.026-MeV level in ${}^{17}F$ has been determined to be $\frac{5 -}{2}$ on the basis of excitation-function measurements of ${}^{16}O (\vec{p}, p) {}^{16}O$ . The $\frac{5 -}{2}$ assignment to the 3.854-MeV level was also confirmed.

[NUCLEAR REACTIONS ${}^{16}O (\vec{p}, p)$ , $E = 3.470, 6.833$ MeV measured $σ (θ)$ , $P (θ)$ . Natural solid target.]

Study of the low-lying states of ${}^{8}{Be}$

F. C. Chang

Phys. Rev. C 9, 1 (1974) - Published 1 January, 1974

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An extended version of the $α$ -particle model which takes into account the internal motion of the nucleons is proposed for ${}^{8}{Be}$ . A two-center harmonic-oscillator potential is assumed for the nucleons. It is found that such a potential is not realistic enough to yield agreement with experiment. It is suggested that a two-center potential of the Woods-Saxon type may be a better choice.

Isobaric-spin violation in the reaction ${}^{10}B (d, d^{'}) {}^{10}B$

H. Stocker and C. P. Browne

Phys. Rev. C 9, 102 (1974) - Published 1 January, 1974

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The reaction ${}^{10}B (d, d^{'}) {}^{10}B$ was investigated to determine the isobaric-spin violation in exciting the lowest $T = 1$ state of ${}^{10}B$ at an excitation energy of 1.74 MeV. The extent and nature of the isobaric-spin-forbidden reaction was obtained by measuring yield curves at laboratory angles of 30, 45, and 77°, using deuteron bombarding energies from 5 to 12 MeV and at 140° from 6.5 to 16 MeV. Simultaneously, data were obtained on the nearby isobaricspin-allowed $T = 0$ state at 2.15 MeV. Generally, broad structure dominates the excitation functions at all angles but tends to disappear at higher bombarding energies. Angular distributions of deuterons leading both to the $T = 0$ and $T = 1$ states were obtained at five bombarding energies between 6.5 and 12.0 MeV. The angular distributions both for the forbidden ( $T = 1$ ) and allowed ( $T = 0$ ) state are characterized by a trend to forward peaking with increasing bombarding energies although much less so for the $T = 1$ state. The total cross sections were measured, and the ratios of the forbidden yield to allowed yield were found to decrease linearly from 0.69% at 6.5 MeV to 0.16% at 12 MeV. In an attempt to describe the angular distributions in terms of a direct-reaction mechanism, distorted-wave Born-approximation (DWBA) calculations were performed assuming collective excitations for the residual nucleus. No clear physical interpretation could be derived from these calculations. Indications are that the reaction ${}^{10}B (d, d^{'}) {}^{10}B$ proceeds through states very high in the compound nucleus ${}^{12}C$ , where the isobaric-spin violation originates in Coulomb mixing of $T = 1$ and $T = 0$ states of the same spin and parity. In view of the very small yield of deuterons leading to the lowest $T = 1$ state in ${}^{10}B$ , and in view of the background difficulties anticipated and experienced, a specialized charged-particle detection system was used, consisting of a position-sensitive gas proportional counter mounted on the focal surface of a broad-range magnetic spectrograph. This constitutes the first observation of the lowest $T = 1$ state in ${}^{10}B$ by the present reaction.

[NUCLEAR REACTIONS ${}^{10}B (d, d^{'})$ , $E = 5 - 16$ MeV; measured $σ (E, θ)$ ; ratio isobaric-spin allowed-forbidden. Enriched targets. DWBA analysis; $θ = 10 - 150^{\circ}$ .]

Nuclear rearrangement scattering. I. Quasifree ( $p, 2 p$ ) reactions

R. R. Scheerbaum and C. M. Shakin

Phys. Rev. C 9, 116 (1974) - Published 1 January, 1974

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A formal theory of scattering, including rearrangement processes, is presented. This theory is based on a model using completely antisymmetrized and orthogonalized channels. A detailed discussion of the ( $p, 2 p$ ) reaction which emphasizes the sequential amplitude for this process is given as an application of the formal theory. The single-hole state generated upon the first collision is discussed using an extension of the theory of intermediate structure to doorway states which are not in a space orthogonal to the space of continuum channels. The theory developed here is able to properly include off-shell and Pauli principle effects in the description of the reaction. Some of the approximations necessary to obtain the standard results for the ( $p, 2 p$ ) cross sections are also exhibited in the context of our general theory.

Angular correlation study of the proton decay of ${}^{14}N$ states below 11 MeV

J. W. Noé, D. P. Balamuth, and R. W. Zurmühle

Phys. Rev. C 9, 132 (1974) - Published 1 January, 1974

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Angular correlations of decay protons from 15 unbound ${}^{14}N$ states below $E_{x} = 11$ MeV were measured in the reaction ${}^{12}C ({}^{3}{He}, p) {}^{14}N (p^{'}) {}^{13}C_{g . s .}$ . Incident ${}^{3}{He}$ energies of 12.0, 13.5, and 14.0 MeV were used in the various measurements. The decay protons ( $p^{'}$ ) were detected in coincidence with reaction protons ( $p$ ) emitted at 0° to the beam direction. The correlations were fitted to a theoretical expression containing adjustable parameters describing the ${}^{14}N$ substate populations and the angular momentum coupling in the ${}^{13}C + p$ system. Where two orbital angular momenta were allowed in the decay channel, generally only the lower allowed value was considered. Our results are compared with previous work and are shown to strengthen several existing $J^{π}$ assignments. New assignments are: 10.06 MeV, $J^{π} = 3^{+}$ or $J \geq 4$ ; 10.81 MeV, $J^{π} = 5^{+}$ . The $\frac{f -}{p}$ -wave mixing in the decay of the 9.17-MeV $2^{+}$ , $T = 1$ state is consistent with previous ${}^{13}C (p, γ)$ experiments; for the 10.43-MeV second $2^{+}$ , $T = 1$ state, $Γ_{l = 3} < (2.7 \times 10^{- 3}) Γ$ . The measured magnetic substate parameters are compared with the predictions of a simple direct-interaction model of the ( ${}^{3}{He}, p$ ) reaction. A recent weak-coupling model calculation of ${}^{14}N$ levels is reviewed in the light of the new results.

[NUCLEAR REACTIONS ${}^{12}C ({}^{3}{He}, p) {}^{14}N (p^{'}) {}^{13}C (g . s .)$ , $E = 12.0, 13.5, 14.0$ MeV; measured $p$ , $p^{'}$ coin., $I_{p^{'}} (θ_{p^{'}})$ , $θ_{p} = 0^{\circ}$ . ${}^{14}N$ -deduced $J$ , $π$ , $δ (l_{p^{'}})$ , channel spin, magnetic substate populations. Magnetic spectrometer, sequential reaction.]

Test of isospin conservation by a comparison of ${}^{3}H$ ( ${}^{3}{He}$ , ${}^{4}{He}$ ) ${}^{2}H$ and ${}^{3}{He} ({}^{3}{He}, {}^{4}{He}) 2 p$ at 16.0 MeV c.m.

W. J. Roberts, E. E. Gross, and E. Newman

Phys. Rev. C 9, 149 (1974) - Published 1 January, 1974

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The absolute differential cross sections for the reactions (A) ${}^{3}H$ ( ${}^{3}{He}$ , ${}^{4}{He}$ ) ${}^{2}H$ and (B) ${}^{3}{He} ({}^{3}{He}, {}^{4}{He}) 2 p$ have been measured at 16.0 MeV c.m. Using final-state interaction theory, we have extracted the cross section for leaving the diproton in the ${}^{1}S_{0}$ state for reaction (B). Conservation of isospin requires this cross section to have twice the magnitude and the same angular distribution as reaction (A). Isospin conservation also requires that reaction (A) be symmetric about 90° c.m. At 16.0 MeV c.m. we find deviations from 90° symmetry for reaction (A) which are consistent with lower-energy data. In addition, we report deviations from isospin conservation for the comparison test. However, using a simple single-nucleon-transfer model, we are able to qualitatively account both for the deviation from 90° c.m. symmetry for reaction (A) and for the deviation from the factor of 2 in the ratio of the yield of reaction (B) to that of reaction (A).

[NUCLEAR REACTIONS ${}^{3}H$ ( ${}^{3}{He}$ , ${}^{4}{He}$ ) ${}^{2}H$ and ${}^{3}{He} ({}^{3}{He}, {}^{4}{He}) 2 p$ at 16 MeV c.m. Measured $(\frac{d σ}{d Ω}) (θ_{c . m .})$ and $(\frac{d^{2} σ}{d Ω dE}) (θ_{c . m .})$ . Test of isospin conservation.]

Study of the ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{Li}$ ${}^{}{(3.56)}$ ) ${}^{6}{Li}$ ${}^{}{(3.56)}$ and the ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{He}$ ) ${}^{6}{Be}$ reactions

W. R. Wharton, J. G. Cramer, J. R. Calarco, and K. G. Nair

Phys. Rev. C 9, 156 (1974) - Published 1 January, 1974

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Angular distributions have been measured for the ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{Li}$ ${}^{*}{(3.56)}$ ) ${}^{6}{Li}$ ${}^{*}{(3.56)}$ and the ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{He}$ ) ${}^{6}{Be}$ reactions at laboratory bombarding energies of 32 and 36 MeV, and excitation functions have been measured at 88° in the center of mass. All final-state nuclei are members of the same $T = 1$ isomultiplet and according to charge independence, the two reactions should have equal cross sections. Large differences in the cross sections of the two reactions are observed indicating that charge-dependent effects are important. For example at 32 MeV the ratio of the two cross sections, ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{Li}^{*}$ ) ${}^{6}{Li}^{*}$ / ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{He}$ ) ${}^{6}{Be}$ , oscillates with angle, varying in magnitude from 0.17 to greater than 1.65.

[NUCLEAR REACTIONS ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{Li}^{*}$ (3.56)), ( ${}^{6}{Li}$ , ${}^{6}{He}$ ), $E = 28 - 36$ MeV; measured $σ (E, θ)$ , $θ = 17 - 90^{\circ}$ c.m., $Δ θ = 4^{\circ}$ ; Legendre polynomial expansion of $σ (θ)$ .]

Isospin-forbidden ${}^{12}C (d, α_{2}) {}^{10}B$ reaction

P. L. Jolivette

Phys. Rev. C 9, 16 (1974) - Published 1 January, 1974

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A partial-wave analysis is presented for new data on the isospin-forbidden ${}^{12}C (d, α_{2}) {}^{10}B$ reaction for $13.8 <~ E_{d} <~ 16$ MeV. Two levels with $J^{π} = 5^{-}$ are found at $E_{x} = 22.51 and 23.36$ MeV with widths of 610 and 500 KeV, respectively (uncertainties are $\approx 100$ keV in all cases). The prominent asymmetry in the region is due to interference between these levels and the tails of lower-energy levels. Consequently, no direct or semidirect reaction mechanism is necessary to explain the yield. The levels found appear to constitute an isospin-mixed pair with $〈 H_{c} 〉 > 40$ keV. The allowed $α_{0, 1, 3}$ , transitions were measured simultaneously.

[NUCLEAR REACTIONS ${}^{12}C (d, α)$ , $E = 13.8 - 17$ MeV; measured $σ (E, θ)$ . $S$ -matrix analysis, deduced ${}^{14}N$ level parameters, isospin-mixed states, reaction mechanism.]

Microscopic analysis of the ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{Li}^{}$ (3.56)) ${}^{6}{Li}^{}$ (3.56) and the ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{He}$ ) ${}^{6}{Be}$ reactions

W. R. Wharton

Phys. Rev. C 9, 164 (1974) - Published 1 January, 1974

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A microscopic distorted-wave Born-approximation (DWBA) analysis of the ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{Li}^{*}$ (3.56)) ${}^{6}{Li}^{*}$ (3.56) and the ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{He}$ ) ${}^{6}{Be}$ reactions has been made and compared to microscopic studies of the $p, p$ and ${}^{3}{He}, t$ reactions. The tensor interaction and full exchange of the $1 p$ shell nucleons has been included. Agreement between the calculation and the data is generally good with two exceptions, and this agreement suggests that the reactions are indeed quasielastic. Special emphasis is given toward explaining the differences between the measured ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{Li}^{*}$ (3.56)) ${}^{6}{Li}^{*}$ (3.56) and ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{He}$ ) ${}^{6}{Be}$ cross sections. The cross sections should be equal according to charge independence because all final states are members of the same $T = 1$ isomultiplet. The theory correctly predicts the angular dependence of the difference in the two cross sections, but it does not predict the magnitude of the difference. The source of this disagreement may be attributed to differences in the wave functions of the final nuclei which are difficult to calculate.

[NUCLEAR REACTIONS ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{Li}$ ), ( ${}^{6}{Li}$ , ${}^{6}{Li}^{*}$ (3.56)), ( ${}^{6}{Li}$ , ${}^{6}{He}$ ), $E = 28 - 36$ MeV; calculated $σ (E, θ)$ ; deduced optical-model parameters. Microscopic DW $\overset{´}{B}$ A analysis, deduced charge dependence.]

Elastic scattering of neutrons from ${}^{3}{He}$ between 7.9 and 23.7 MeV

M. Drosg, D. K. McDaniels, J. C. Hopkins, J. D. Seagrave, R. H. Sherman, and E. C. Kerr

Phys. Rev. C 9, 179 (1974) - Published 1 January, 1974

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Neutrons of 7.9, 12.0, 13.6, 14.4, and 23.7 MeV were elastically scattered from a 0.54-mole sample of liquid ${}^{3}{He}$ . The angular distributions of the scattered neutrons were measured by the time-of-flight method at 14 angles ranging from $cos θ_{c . m .} = 0.9 to - 0.7$ with relative errors of typically 4%. The absolute values were derived by comparison with the ${}^{1}H (n, n) {}^{1}H$ reaction with scale errors of about 3%. Many of the older distributions and total $n - {}^{3}{He}$ cross sections in this energy range are superseded by the new measurements. Upper limits for the ${}^{3}{He} (n, n p) {}^{2}H + {}^{3}{He} (n, 2 n) 2 p$ cross-sections sum are derived. The differential cross sections at 7.9, 13.6, and 14.4 MeV are compared with their charge-symmetric counterpart at nearby energies. The contribution of this experiment to phase-shift analysis of the ${}^{3}{He} (n, n) {}^{3}{He}$ data is discussed.

[NUCLEAR REACTIONS ${}^{3}{He} (n, n) {}^{3}{He}$ , $E = 7.9 - 23.7$ MeV; measured $σ (E; θ)$ ; deduced $σ_{el}$ and limits for $σ_{tot}$ and $σ_{n, 2 n} + σ_{n, p n}$ ; comparison with charge-symmetric reaction.]

Pion-nucleus coordinate-space potential

Leonard S. Kisslinger and Frank Tabakin

Phys. Rev. C 9, 188 (1974) - Published 1 January, 1974

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A first-order pion-nucleus optical potential which is convenient for the analysis of pion-nucleus data is presented. This configuration-space potential incorporates a number of important theoretical features. A Lorentz transformation of the pion-nucleon interaction from the pion-nucleon to the pion-nucleus center-of-mass system is shown to yield a first-order potential which is almost local in coordinate space, and which differs from the originally proposed gradient potential, by containing an additional term proportional to the Laplacian of the density. We then show how this form is modified by off-shell and high-energy considerations. It is emphasized that proper off-shell and threshold behavior can be included and that energy and momentum variables must be treated carefully in deriving the optical potential. Typical numerical results are given and the new potential is shown to yield significant build-up of large-angle cross sections.

[NUCLEAR REACTIONS ${}^{12}C (π, π)$ , $E = 120 - 280$ MeV; calculated $σ (θ)$ : Optical potential deduced from multiple-scattering theory.]

Angular-correlation and branching-ratio studies of ${}^{41}{Ca}$ with the ${}^{40}{Ca} (d, p γ) {}^{41}{Ca}$ reaction

L. C. McIntyre, Jr.

Phys. Rev. C 9, 200 (1974) - Published 1 January, 1974

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Collinear-geometry angular-correlation and branching-ratio information is presented on 28 levels in ${}^{41}{Ca}$ up to approximately 4.5 MeV excitation. The ${}^{40}{Ca} (d, p γ) {}^{41}{Ca}$ reaction was used with an incident deuteron energy of 3 MeV. $γ$ rays were detected with a Ge(Li) detector.

[NUCLEAR REACTIONS ${}^{40}{Ca} (d, p γ)$ , $E = 3$ MeV; measured $p - γ$ angular correlations, branching ratios; deduced $δ$ . Ge(Li) detector.]

${}^{26}{Mg} (t, {}^{3}{He})$ reaction and a spherical-shell-model description of ${}^{26}{Na}$

E. R. Flynn and J. D. Garrett

Phys. Rev. C 9, 210 (1974) - Published 1 January, 1974

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The ${}^{26}{Mg} (t, {}^{3}{He})$ reaction at an incident energy of 23.5 MeV has been used to measure the ground-state mass and the energies of the excited states of ${}^{26}{Na}$ . The measured mass excess (-6.903 ± 0.020 MeV) is in agreement with that measured using the ${}^{26}{Mg}$ ( ${}^{7}{Li}$ , ${}^{7}{Be}$ ) reaction and with the most recent $β$ -decay end-point measurement. The spectrum of low-lying levels together with a recent assignment of $3^{+}$ for the ground-state spin are not consistent with a rotational interpretation for ${}^{26}{Na}$ . These data, however, can be explained in terms of the spherical shell model.

[NUCLEAR REACTIONS ${}^{26}{Mg} (t, {}^{3}{He}) E = 23.5$ MeV measured $Q$ value, ${}^{26}{Al}$ levels.]

$β$ decay of ${}^{22}F$

Cary N. Davids, David R. Goosman, David E. Alburger, A. Gallmann, G. Guillaume, D. H. Wilkinson, and W. A. Lanford

Phys. Rev. C 9, 216 (1974) - Published 1 January, 1974

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${}^{22}F$ was produced in the ${}^{18}O ({}^{6}{Li}, 2 p) {}^{22}F$ reaction using 26-MeV ${}^{6}{Li}^{3 +}$ ions. Following transfer of the target in a shuttle system, delayed $γ$ and $β$ rays were observed with Ge(Li) and NE102 plastic detectors. Several $γ$ rays from ${}^{22}F$ decay were observed, decaying with a half-life of 4.23 ± 0.04 sec. $γ - γ$ coincidence measurements have established that a 1900.0-keV transition terminates on a level in ${}^{22}{Ne}$ at 5523.4 keV, contrary to a previous study. The ground state of ${}^{22}F$ is of $J^{π} = 4^{+}$ (with $3^{+}$ as a remote possibility) disagreeing with a previous assignment of $5^{+}$ . Accurate excitation energies are presented for seven states in ${}^{22}{Ne}$ . Experimental results compare favorably with full $2 s - 1 d$ basis shell-model calculations of the $A = 22$ system.

[RADIOACTIVITY ${}^{22}F$ ; measured $t_{\frac{1}{2}}$ , $E_{γ}$ , $I_{γ}$ , $E_{β}$ , $γ - γ$ coin., $γ - β$ coin., deduced decay scheme, $J$ of ${}^{22}F$ , $log ft$ , $E_{levels}$ ; compared with theory.]

States of ${}^{55}{Co}$ via the ${}^{58}{Ni} (p, α) {}^{55}{Co}$ reaction

J. D. Goss, G. A. Huttlin, C. P. Browne, and A. A. Rollefson

Phys. Rev. C 9, 227 (1974) - Published 1 January, 1974

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$α$ particles from the ${}^{58}{Ni} (p, α) {}^{55}{Co}$ reaction were analyzed with a 100-cm modified broad-range magnetic spectrograph. Data were taken at nominal bombarding energies from 12 to 16 MeV and at the observation angles of 60, 90, and 120°. 90 levels have been identified in ${}^{55}{Co}$ in the region of excitation from the ground state to 6.6 MeV. Below 3 MeV, a new level at 2.9785 MeV has been observed and the existence of two levels at 2.9238 and 2.9428 MeV has been further verified. 47 previously unreported levels have been observed and uncertainties in excitation energies have been reduced in many cases by as much as a factor of 6 or more. The possibility of a 33-fold degeneracy in the 1160-keV $γ$ -ray transition and a 25-fold degeneracy in the 1600-keV $γ$ -ray transition which are seen in ( $p, γ$ ) is discussed.

[NUCLEAR REACTIONS ${}^{58}{Ni} (p, α)$ , $E = 12 - 16$ MeV; ${}^{55}{Co}$ levels deduced. Enriched targets. $θ = 60 - 120^{\circ}$ .]

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Gamow-state analysis of ${}^{54}{Fe} (d, n)$ to proton resonances in ${}^{55}{Co}$

Mechanisms in the reactions ${}^{3}H$ + ${}^{3}{He}$ and ${}^{3}H$ + ${}^{2}H$ and measurement of the reaction ${}^{3}H (p, {}^{3}{He}) n$ from 13.6 to 32.8 MeV

Statistical-model analysis of gamma-ray angular distributions following the ${}^{48}{Ti} (p, p^{'}) {}^{48}{Ti}$ reaction at $E_{p} = 5.0$ MeV

New mass-table parameters for nuclei $Z \leq 16$

Measurement of the radiative width of the 12.71-MeV level in ${}^{12}C$

Spins of the 3.854-MeV and 7.026-MeV levels in ${}^{17}F$ from ${}^{16}O (\vec{p}, p) {}^{16}O$

Study of the low-lying states of ${}^{8}{Be}$

Isobaric-spin violation in the reaction ${}^{10}B (d, d^{'}) {}^{10}B$

Nuclear rearrangement scattering. I. Quasifree ( $p, 2 p$ ) reactions

Angular correlation study of the proton decay of ${}^{14}N$ states below 11 MeV

Test of isospin conservation by a comparison of ${}^{3}H$ ( ${}^{3}{He}$ , ${}^{4}{He}$ ) ${}^{2}H$ and ${}^{3}{He} ({}^{3}{He}, {}^{4}{He}) 2 p$ at 16.0 MeV c.m.

Study of the ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{Li}$ ${}^{}{(3.56)}$ ) ${}^{6}{Li}$ ${}^{}{(3.56)}$ and the ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{He}$ ) ${}^{6}{Be}$ reactions

Isospin-forbidden ${}^{12}C (d, α_{2}) {}^{10}B$ reaction

Microscopic analysis of the ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{Li}^{}$ (3.56)) ${}^{6}{Li}^{}$ (3.56) and the ${}^{6}{Li}$ ( ${}^{6}{Li}$ , ${}^{6}{He}$ ) ${}^{6}{Be}$ reactions

Elastic scattering of neutrons from ${}^{3}{He}$ between 7.9 and 23.7 MeV

Pion-nucleus coordinate-space potential

Angular-correlation and branching-ratio studies of ${}^{41}{Ca}$ with the ${}^{40}{Ca} (d, p γ) {}^{41}{Ca}$ reaction

${}^{26}{Mg} (t, {}^{3}{He})$ reaction and a spherical-shell-model description of ${}^{26}{Na}$

$β$ decay of ${}^{22}F$

States of ${}^{55}{Co}$ via the ${}^{58}{Ni} (p, α) {}^{55}{Co}$ reaction

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