Recent Articles

Erratum: High-spin states in Pd isotopes and gapless superconductivity

M. K. Ghosh and S. R. Majumdar

Phys. Rev. C 15, 1183 (1977) - Published 1 March, 1977

( $p, pd$ ), ( $p, pt$ ) and ( $p, p {}^{3}{He}$ ) reactions on ${}^{12}C$ and ${}^{16}O$ at 75 MeV

J. Y. Grossiord, M. Bedjidian, A. Guichard, M. Gusakow, J. R. Pizzi, T. Delbar, G. Grégoire, and J. Lega

Phys. Rev. C 15, 843 (1977) - Published 1 March, 1977

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( $p, pd$ ), ( $p, pt$ ), and ( $p, p {}^{3}{He}$ ) reactions have been studied at 75 MeV on ${}^{12}C$ and ${}^{16}O$ . A good energy resolution (∼400 keV) permitted the observation of several levels of the different residual nuclei. The results are analyzed with distorted-wave impulse approximation calculations and spectroscopic factors are extracted and compared with theoretical predictions. A comparison of our results with experimental data from transfer reactions on the same nuclei is made. Spectroscopic and mechanism information are discussed; in particular, the excitation of $T = 1$ levels in ${}^{10}B$ and ${}^{14}N$ allowed the comparison with $p - d^{*}$ ( $S = 0$ , $T = 1$ ) scattering obtained from other reactions.

NUCLEAR REACTIONS ${}^{12}C$ , ${}^{16}O (p, p x)$ , $x = d$ , $t$ , ${}^{3}{He}$ , $T_{0} = 75$ MeV measured $σ (T_{p}, θ_{p}, T_{x}, θ_{x})$ ; deduced $S$ from DWIA interpretation; comparison with transfer reactions.

Three-body calculation of ${}^{6}{Li}$ and $d - α$ elastic scattering

B. Charnomordic, C. Fayard, and G. H. Lamot

Phys. Rev. C 15, 864 (1977) - Published 1 March, 1977

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The Faddeev-Lovelace equations have been solved for the $A = 6$ system with the use of new $N - α$ separable interactions. The ${}^{6}{Li}$ spectrum is given and the ( $d - α$ ) elastic scattering observables (angular distributions, vector and tensor polarizations) are calculated and compared with recent experimental data. A noticeable improvement on Shanley's results is obtained.

NUCLEAR REACTIONS ${}^{6}{Li}$ ; $d - α$ elastic scattering $E_{d} = 0 - 25$ MeV, $\frac{d σ}{d Ω}$ , vector and tensor polarizations, three-body calculation; separable interactions.

States of ${}^{54}V$ and ${}^{58}{Mn}$

E. R. Flynn, J. W. Sunier, and F. Ajzenberg-Selove

Phys. Rev. C 15, 879 (1977) - Published 1 March, 1977

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The ${}^{54}{Cr} (t, {}^{3}{He}) {}^{54}V$ and ${}^{58}{Fe} (t, {}^{3}{He}) {}^{58}{Mn}$ reactions have been used to study the masses and the low-lying excited states of ${}^{54}V$ and ${}^{58}{Mn}$ , using 23 MeV tritons and a quadrupole-dipole-dipole-dipole spectrometer. The mass excess of ${}^{54}V$ is -49 891(15) keV. At least 19 excited states of ${}^{54}V$ with $E_{x} < 2.5$ MeV have been observed. The mass excess of ${}^{58}{Mn}$ is -55 832(30) keV, assuming that an (unresolved) isomeric state exists at $E_{x} = 30 \pm 10$ keV. $β$ decay evidence from other work, together with these results, suggests that these two states have $J^{π} = 3^{+} and 0^{+}$ . Sixteen other states of ${}^{58}{Mn}$ have been observed with $E_{x} < 1.9$ MeV.

NUCLEAR REACTIONS ${}^{54}{Cr} (t, {}^{3}{He})$ , ${}^{58}{Fe} (t, {}^{3}{He})$ , $E = 23.0$ MeV; measured ( $θ$ ), ${}^{54}V$ , ${}^{58}{Mn}$ deduced levels. New masses of ${}^{54}V$ and ${}^{58}{Mn}$ .

Neutron capture gamma-ray studies of levels in ${}^{123}{Sn}$ and ${}^{125}{Sn}$

R. F. Carlton, S. Raman, and G. G. Slaughter

Phys. Rev. C 15, 883 (1977) - Published 1 March, 1977

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Neutron capture $γ$ -ray measurements have been performed upon enriched samples of ${}^{122}{Sn}$ and ${}^{124}{Sn}$ following resonance capture. The $γ$ rays, measured with a Ge(Li) detector, have been incorporated in level schemes for ${}^{123}{Sn}$ and ${}^{125}{Sn}$ . New spin and parity assignments have been made for many of the levels. Three new levels have been found in ${}^{125}{Sn}$ . Neutron separation energies for ${}^{123}{Sn}$ and ${}^{125}{Sn}$ were determined to be 5945.8 ± 1.5 and 5732.2 ± 1.5 keV, respectively. The level schemes have been compared with those of ${}^{119}{Sn}$ and ${}^{121}{Sn}$ to investigate systematic behavior.

NUCLEAR REACTIONS ${}^{122}{Sn} (n, γ)$ , $E = 0.1 - 20$ keV, ${}^{124}{Sn} (n, γ)$ , $E = 0.05 - 11$ keV; measured $E_{γ}$ , $I_{γ}$ . ${}^{123, 125}{Sn}$ deduced levels, $J$ , $π$ , neutron separation energies. ${}^{119, 121, 123, 125}{Sn}$ systematics. Enriched targets.

Levels of ${}^{68}{Ge}$ excited by the ( $p, t$ ) reaction

F Guilbault, D. Ardouin, R. Tamisier, P. Avignon, M. Vergnes, G. Rotbard, G. Berrier, and R. Seltz

Phys. Rev. C 15, 894 (1977) - Published 1 March, 1977

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The ${}^{70}{Ge} (p, t) {}^{68}{Ge}$ reaction has been studied at 26 MeV incident energy with an overall resolution of 10 keV using a split-pole spectrometer. Forty-one ${}^{68}{Ge}$ levels, among which twenty-eight are observed for the first time, are populated below 5.2 MeV excitation energy. Angular distributions are obtained, and comparison with distorted-wave Born approximation calculations allows spin and parity assignments. An interesting result is the discovery of the first excited $0^{+}$ level at 1.753 MeV as well as seven other $0^{+}$ levels above 2 MeV energy. Five $J^{π} = 2^{+}$ and four $J^{π} = 4^{+}$ levels are observed for the first time. We also establish the position of the first $J^{π} = 3^{-}$ level at 2.651 MeV and the possibility of a $J^{π} = 6^{+}$ level at 4.456 MeV excitation energy.

NUCLEAR REACTIONS ${}^{70}{Ge} (p, t)$ , $E = 26$ MeV; measured $σ = σ (θ)$ ; ${}^{68}{Ge}$ deduced levels up to 5.2 MeV, $J$ , $π$ .

Spectroscopy of ${}^{140}{Ce}$ and ${}^{138}{Ce}$ via the ${}^{140}{Ce} (p, p^{'})$ , ${}^{142}{Ce} (p, t)$ , and ${}^{140}{Ce} (p, t)$ reactions at $E_{p} = 30$ MeV

J. D. Sherman, D. L. Hendrie, and M. S. Zisman

Phys. Rev. C 15, 903 (1977) - Published 1 March, 1977

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The nuclei ${}^{138, 140}{Ce}$ have been studied by means of the ${}^{140}{Ce} (p, t)$ , ${}^{142}{Ce} (p, t)$ , and ${}^{140}{Ce} (p, p^{'})$ reactions at 30 MeV. Angular distributions have been measured from $θ_{lab} = 16 ° to 64 °$ . The inelastic scattering data were analyzed with distorted-wave Born approximation to confirm multipolarities and extract deformation parameters for the strongly excited levels. The ( $p, t$ ) data were also analyzed with distorted-wave Born approximation to obtain limits on the two-nucleon orbital angular momentum ( $L$ ) transfer. This analysis, plus the empirical angular distribution shapes of levels with known $J^{π}$ , permits us to suggest (or at least limit) $J^{π}$ values for many new levels. The ( $p, t$ ) differential cross sections have been further analyzed in terms of simple two-neutron configurations through the enhancement factor concept. The two-neutron transfer results are discussed in terms of the pair vibration model.

NUCLEAR REACTIONS ${}^{142, 140}{Ce} (p, t)$ , ${}^{140}{Ce} (p, p^{'})$ , $E_{p} = 30$ MeV; measured level energies and $σ (θ)$ ; DWBA analysis, deformation parameters, enhancement factors.

Thresholds for ${}^{116}{Sn} (p, n)$ and ${}^{118}{Sn} (p, n)$

C. H. Johnson, J. K. Bair, and C. M. Jones

Phys. Rev. C 15, 915 (1977) - Published 1 March, 1977

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The ${}^{116}{Sn} (p, n)$ and ${}^{118}{Sn} (p, n)$ thick-target integrated cross sections were measured up to about 100 keV above the thresholds and fitted by the Hauser-Feshbach statistical theory. It is shown for these nuclei that the familiar plot of the thick-target yield to the two-thirds power is not valid, except for an impractical region very near threshold. It is also shown that $γ$ -ray emission dominates over neutron and proton emission for more than 100 keV above each threshold. The deduced thresholds are 5531 ± 6 keV for ${}^{116}{Sn}$ and 4477 ± 3 keV for ${}^{118}{Sn}$ . The corresponding $Q$ values, 5483 ± 6 keV and 4439 ± 3 keV, disagree with values from the literature.

NUCLEAR REACTIONS ${}^{116, 118}{Sn} (p, n)$ , measured $σ_{p, n}$ near the thresholds, deduced $Q$ values.

Electric moments and charge deformation parameters in ${}^{152, 154}{Sm}$ , ${}^{156}{Gd}$ , and ${}^{166}{Er}$

H. Fischer, D. Kamke, H. J. Kittling, E. Kuhlmann, H. Plicht, and R. Schormann

Phys. Rev. C 15, 921 (1977) - Published 1 March, 1977

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Coulomb excitation experiments with $α$ particles were performed on the four rare-earth nuclei ${}^{152, 154}{Sm}$ , ${}^{156}{Gd}$ , and ${}^{166}{Er}$ . $E 2$ and $E 4$ transition matrix elements of low-lying levels in the rotational ground-state bands were obtained. Model dependent charge deformation parameters $β_{2}^{c}$ and $β_{4}^{c}$ were extracted assuming a deformed Fermi distribution with diffuse surface. The possible difference between charge and nuclear hexadecapole deformation observed in ${}^{154}{Sm}$ does not show up in the isotone ${}^{156}{Gd}$ .

NUCLEAR REACTIONS ${}^{152, 154}{Sm}$ , ${}^{156}{Gd}$ , ${}^{166}{Er} (α, α^{'})$ , $E = 11.25 - 12.00$ MeV, measured $σ (E_{α}; θ = 160 °, 170 °)$ . Deduced $〈 2^{+} ∥ M (E 2) ∥ 0^{+} 〉$ , $〈 4^{+} ∥ M (E 4) ∥ 0^{+} 〉$ ; extracted $β_{2}^{c}$ , $β_{4}^{c}$ from Fermi charge distribution. Enriched targets.

Deformation effects in neutron scattering from the Sm isotopes

M. T. McEllistrem, R. E. Shamu, J. Lachkar, G. Haouat, Ch. Lagrange, Y. Patin, J. Sigaud, and F. Çocu

Phys. Rev. C 15, 927 (1977) - Published 1 March, 1977

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Differential cross sections for neutron scattering from four even- $A$ isotopes of Sm have been measured at an incident energy of 7 MeV. Separated isotope samples having enrichments between 87.4 and 99.5% were used, each sample containing about 0.15 moles. Measurements have been separated for elastic and inelastic scattering to the first $2^{+}$ levels of ${}^{148}{Sm}$ , ${}^{150}{Sm}$ , and ${}^{152}{Sm}$ . For ${}^{154}{Sm}$ the two processes were not separated. The data show directly the striking effects of the difference in coupling between the $0^{+}$ and $2^{+}$ levels of these transitional nuclei. Accurately measured total cross sections and low energy scattering properties have been combined with these 7 MeV results in a coupled-channel analysis. Coupling parameters extracted from the analysis have been shown to be significantly less than the deformation parameters which characterize the charge distributions of the deformed isotopes.

NUCLEAR REACTIONS ${}^{148, 150, 152, 154}{Sm} (n, n)$ , ( $n, n^{'}$ ), $E = 7$ MeV; measured $σ (E_{n}, θ)$ ; deduced coupled-channels potential parameters, deformation parameters; $θ = 20 - 145 °$ ; $Δ θ = 5 °$ .

Ground-state band in ${}^{72}{Se}$

K. P. Lieb and J. J. Kolata

Phys. Rev. C 15, 939 (1977) - Published 1 March, 1977

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Yrast states in ${}^{72}{Se}$ up to $I^{π} = 14^{+}$ have been excited in the reaction ${}^{58}{Ni} ({}^{16}O, 2 p)$ at 40-58 MeV beam energy. Their mean lifetimes have been determined by using the Doppler shift attenuation method. The measured $B (E 2)$ values of transitions within the ground-state band are discussed in terms of several nuclear models, including the triaxial rotor and interacting boson models. An upper limit of $τ_{f} < 0.1$ ps was deduced for the feeding-time of the highest yrast states.

NUCLEAR REACTIONS ${}^{58}{Ni} ({}^{16}O, 2 p γ)$ 40-58 MeV; measured $E_{γ}$ , relative excitation functions, angular distributions, Doppler shift; deduced $E_{x}$ , $I^{π}$ , $T_{\frac{1}{2}}$ , feeding time.

Spin assignments for the sub-Coulomb resonances of the ${}^{12}C$ + ${}^{12}C$ reaction

W. Galster, W. Treu, P. Dück, H. Fröhlich, and H. Voit

Phys. Rev. C 15, 950 (1977) - Published 1 March, 1977

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Excitation functions of the reaction ${}^{12}C ({}^{12}C, α) {}^{20}{Ne}$ have been measured in 50-keV energy steps from $E_{c . m .} = 4.0 - 8.0$ MeV at 15 angles between $θ_{c . m .} = 6 ° and 90 °$ . From the angle-integrated cross sections of the first six transitions to ${}^{20}{Ne}$ the following resonance energies have been deduced: $E_{c . m .} = 4.25, 4.46, 4.62, 4.88, 5.0, 5.64, 5.92, and 6.25$ MeV. The spin-parity assignments for these resonances have been determined to be $0^{+}$ , $4^{+}$ ( $2^{+}$ ), $2^{+}$ , $2^{+}$ , $2^{+}$ , $2^{+}$ , $4^{+}$ , and $2^{+}$ , respectively.

NUCLEAR REACTIONS ${}^{12}C ({}^{12}C, α)$ , $E = 4 - 8$ MeV, measured $σ (θ, E)$ , extracted resonance energies and $J^{π}$ values.

Elastic scattering, transfer reactions, and fission induced by ${}^{16}O$ ions on ${}^{181}{Ta}$ and ${}^{208}{Pb}$

F. Videbæk, R. B. Goldstein, L. Grodzins, S. G. Steadman, T. A. Belote, and J. D. Garrett

Phys. Rev. C 15, 954 (1977) - Published 1 March, 1977

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Total cross sections for the quasielastic and fission channels in reactions of ${}^{16}O$ on ${}^{181}{Ta}$ and ${}^{208}{Pb}$ were measured as a function of the incident energy near the Coulomb barrier. For ${}^{208}{Pb}$ , the fission and quasielastic components account for essentially all of the total reaction cross sections as deduced from the elastic scattering. However, for ${}^{181}{Ta}$ , the fission and quasielastic components account for only about 25% of the total cross section as deduced from elastic scattering. The fission fragment angular distributions for ${}^{208}{Pb}$ are analyzed with a simple statistical approach yielding an effective moment of inertia at the saddle point compatible with the liquid-drop-model prediction. Fission excitation functions for ${}^{181}{Ta}$ are described reasonably well by a statistical evaporation code.

NUCLEAR REACTIONS Ta( ${}^{16}O$ , ${}^{16}O$ ), ( ${}^{16}O$ , ${}^{17}O$ ), ( ${}^{16}O$ , ${}^{15}N$ ), ( ${}^{16}O$ , C), ( ${}^{16}O$ , $f$ ), $E_{L} = 83, 90, 96$ MeV. ${}^{208}{Pb}$ ( ${}^{16}O$ , ${}^{16}O$ ), ( ${}^{16}O$ , ${}^{17}O$ ), ( ${}^{16}O$ , ${}^{15}N$ ), ( ${}^{16}O$ , C) $E_{L} = 80, 83, 88, 90, 96, 102$ MeV, measured $σ (θ, E)$ . $Ta ({}^{16}O, f)$ $E_{L} = 77 - 102$ MeV, measured $σ (E)$ ; deduced optical-model parameters, total reaction cross sections; enriched targets.

Phenomenological analysis of high energy nuclear fragmentation based on the diffractive excitation model

Naohiko Masuda and Fumiyo Uchiyama

Phys. Rev. C 15, 972 (1977) - Published 1 March, 1977

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A phenomenological study of fragmentation of beam nuclei in the Bevatron energy region is made based on the diffractive excitation model. Two body dissociation and fragmentation are assumed. It is shown that because of the slight energy transfer between colliding nuclei, the interfragment binding energy of the beam nucleus plays an important role in the fragmentation even in the high energy region and that the main features of relative partial cross sections and momentum distribution widths of fragments can be understood with the diffractive excitation model. Some implications of our results for the cluster structure of the beam nuclei are discussed.

NUCLEAR REACTIONS Analysis of data on the partial cross sections and momentum width distributions of fragments from ${}^{16}O$ and ${}^{12}C$ at 2.1 and 1.05 GeV/N, diffractive excitation model.

$π NN$ vertex operator and $π N$ scattering

M. Bolsterli

Phys. Rev. C 15, 981 (1977) - Published 1 March, 1977

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Recoil-momentum spectrum of ${}^{12}C$ * from $π^{-}$ capture on ${}^{14}N$

C. E. Stronach, W. J. Kossler, H. O. Funsten, W. F. Lankford, and B. J. Lieb

Phys. Rev. C 15, 984 (1977) - Published 1 March, 1977

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Negative pions were stopped in LiN $H_{2}$ and the nuclear deexcitation $γ$ rays were observed. The Dopplerbroadened line shape of the decay $γ$ rays from the $2^{+}$ state of ${}^{12}C$ at 4439 keV was analyzed to obtain the momentum distribution of the recoiling ${}^{12}C$ nuclei. This distribution is compared with the prediction of a simple model which assumes one-step quasifree $π^{-}$ absorption on a quasideuteron pair.

NUCLEAR REACTIONS ${}^{14}N (π^{-}, X γ)$ , $E = 0$ ; measured $E_{γ}$ and Doppler broadening.

Electroproduction and photoproduction of charged pions on ${}^{27}{Al}$ and ${}^{51}V$ at intermediate energies

I. Blomqvist, P. Janeček, G. G. Jonsson, H. Dinter, K. Tesch, N. Freed, and P. Ostrander

Phys. Rev. C 15, 988 (1977) - Published 1 March, 1977

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Cross sections for electroproduction and photoproduction of charged pions on ${}^{27}{Al}$ and ${}^{51}V$ have been measured in the energy region 130-580 MeV by use of the activation method. Special care has been taken to subtract out background yields. Photoproduction cross sections have been calculated from the region just above threshold to the tail of the (3,3) resonance. $π$ -nucleus final state interactions are taken into account through optical potentials. Calculated photoproduction cross sections are decomposed into multipoles which are used to derive relative bremsstrahlung-induced to electron-induced yields. The pronounced effect of final state interactions is pointed out and discussed.

NUCLEAR REACTIONS ${}^{27}{Al} (γ, π^{+})$ , ${}^{27}{Al} (e, e^{'} π^{+})$ , ${}^{51}V (γ, π^{+})$ , ${}^{51}V (e, e^{'} π^{+})$ , ${}^{51}V (γ, π^{-})$ , ${}^{50}V (e, e^{'} π^{-})$ . Activation method. $E_{0} = 130 - 580$ MeV; measured $σ_{q}$ and $σ_{e}$ , deduced $σ_{k}$ ; calculated $σ_{k}$ and $\frac{σ_{q}}{σ_{e}}$ . Ge(Li) detector.

Analyzing power of the ${}^{6}{Li} (\vec{n}, {}^{3}H) {}^{4}{He}$ reaction from 0.2 to 2.4 MeV

Munawar Karim and J. C. Overley

Phys. Rev. C 15, 467 (1977) - Published 1 February, 1977

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Analyzing powers of the ${}^{6}{Li} (\vec{n}, {}^{3}H) {}^{4}{He}$ reaction have been measured at six angles for neutron energies from 0.2 to 1.5 MeV. A supplementary data set at two angles extends the energy range to 2.4 MeV. An energy continuum of neutrons was produced by bombarding a thick lithium metal target with a nanosecond-pulsed proton beam. Partially polarized neutrons emitted at 50° were incident on an evaporated ${}^{6}{Li}$ metal target. A silicon surface barrier detector was used to measure $α$ -particle and triton yields as a function of particle energy at angles of 30°, 60°, and 80°. For the supplementary data set the reaction angle was 55°. Tritons and $α$ particles were distinguished by time-of-flight techniques. $α$ -particle yield asymmetries were converted to backward angle triton asymmetries. Analyzing powers were deduced from asymmetries. The data suggest interference between $s$ waves and the $p$ -wave ${\frac{5}{2}}^{-}$ resonance at 0.247 MeV. Interference between the ${\frac{5}{2}}^{-}$ level and a broad ${\frac{3}{2}}^{-}$ state above 2 MeV also contributes. At higher energies interference between the ${\frac{3}{2}}^{-}$ state and $s$ waves results in analyzing powers close to +0.9 near 90° which vary slowly with neutron energy between 0.7 and 2.4 MeV.

NUCLEAR REACTIONS ${}^{6}{Li} (\vec{n}, {}^{3}H)$ , $E = 0.2 - 2.4$ MeV, measured $A_{y} (θ)$ ,. $θ = 30 - 150 °$ .

One- and two-step processes in single-nucleon pickup

Jan Källne and Andrew W. Obst

Phys. Rev. C 15, 477 (1977) - Published 1 February, 1977

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The reaction ${}^{12}C (p, d) {}^{11}C$ at high momentum transfers ( $q ≳ 200$ MeV/c) has been examined with respect to single- and two-step processes. Our coupled-channel Born-approximation analysis of the reaction at 185 MeV shows that peculiarities observed in experimental angular distributions can be explained with the two-step process or the interference between the single-step and two-step processes. The analysis requires the presence of small $1 d$ and $1 f_{\frac{7}{2}}$ admixtures in the ${}^{12}C$ ground state along with the basic $1 s^{4} 1 p^{8}$ configuration. The different energy dependence in the single-step and two-step processes is discussed and illustrated by data at 185 and 700 MeV.

NUCLEAR REACTIONS ${}^{12}C (p, d)$ $E_{p} = 185$ MeV; calculated $σ (θ)$ ; CCBA analysis.

Radiative transitions and isospin mixing in ${}^{12}C$

E. G. Adelberger, R. E. Marrs, K. A. Snover, and J. E. Bussoletti

Phys. Rev. C 15, 484 (1977) - Published 1 February, 1977

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$γ$ -ray decays of the 12.7 and 16.1 MeV states of ${}^{12}C$ are investigated in a coincidence study of the ${}^{10}B ({}^{3}{He}, p γ)$ reaction. We obtain $\frac{Γ_{γ 0}}{Γ} = (1.93 \pm 0.12) %$ , $\frac{Γ_{γ 1}}{Γ_{γ 0}} = (15.0 \pm 1.8) %$ and $\frac{Γ_{α}}{Γ} = (97.8 \pm 0.1) %$ for ${}^{12}C$ (12.7), and $\frac{Γ_{γ 1}}{Γ} = (2.42 \pm 0.29) \times 10^{- 3}$ for ${}^{12}C$ (16.1). Relative $γ$ -ray branching ratios of ${}^{12}C$ (16.1) were measured using the $E_{p} = 163$ keV ${}^{11}B (p, γ)$ resonance. We find $\frac{Γ_{γ 0}}{Γ_{γ 1}} = (4.6 \pm 0.7) %$ , $\frac{Γ_{γ} (16.1 \to 9.6)}{Γ_{γ 1}} = (2.4 \pm 0.4) %$ , and $\frac{Γ_{γ} (16.1 \pm 12.7)}{Γ_{γ 1}} = (1.46 \pm 0.25) %$ . This information, together with existing data on $M 1$ transitions and single nucleon transfer reactions, is used to determine the isospin mixing between the 12.7 and 15.1 MeV levels of ${}^{12}C$ . A charge dependent matrix element of 110 ± 30 keV is deduced.

NUCLEAR REACTIONS ${}^{10}B ({}^{3}{He}, p γ)$ , $E = 4.1$ MeV, $p$ , $γ$ coincidence. Deduced $Γ_{γ}$ for ${}^{12}C$ levels at 12.7, 16.1 MeV. ${}^{11}B (p, γ)$ , $E = 163$ keV resonance. Measured $Γ_{γ}$ for transitions to 0.0, 4.4, 9.6, and 12.7 MeV in ${}^{12}C$ .

NUCLEAR STRUCTURE ${}^{12}C$ , deduced isospin mixing between 12.7 and 15.1 MeV levels.

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Physical Review C

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Recent Issues

Erratum: High-spin states in Pd isotopes and gapless superconductivity

( $p, pd$ ), ( $p, pt$ ) and ( $p, p {}^{3}{He}$ ) reactions on ${}^{12}C$ and ${}^{16}O$ at 75 MeV

Three-body calculation of ${}^{6}{Li}$ and $d - α$ elastic scattering

States of ${}^{54}V$ and ${}^{58}{Mn}$

Neutron capture gamma-ray studies of levels in ${}^{123}{Sn}$ and ${}^{125}{Sn}$

Levels of ${}^{68}{Ge}$ excited by the ( $p, t$ ) reaction

Spectroscopy of ${}^{140}{Ce}$ and ${}^{138}{Ce}$ via the ${}^{140}{Ce} (p, p^{'})$ , ${}^{142}{Ce} (p, t)$ , and ${}^{140}{Ce} (p, t)$ reactions at $E_{p} = 30$ MeV

Thresholds for ${}^{116}{Sn} (p, n)$ and ${}^{118}{Sn} (p, n)$

Electric moments and charge deformation parameters in ${}^{152, 154}{Sm}$ , ${}^{156}{Gd}$ , and ${}^{166}{Er}$

Deformation effects in neutron scattering from the Sm isotopes

Ground-state band in ${}^{72}{Se}$

Spin assignments for the sub-Coulomb resonances of the ${}^{12}C$ + ${}^{12}C$ reaction

Elastic scattering, transfer reactions, and fission induced by ${}^{16}O$ ions on ${}^{181}{Ta}$ and ${}^{208}{Pb}$

Phenomenological analysis of high energy nuclear fragmentation based on the diffractive excitation model

$π NN$ vertex operator and $π N$ scattering

Recoil-momentum spectrum of ${}^{12}C$ * from $π^{-}$ capture on ${}^{14}N$

Electroproduction and photoproduction of charged pions on ${}^{27}{Al}$ and ${}^{51}V$ at intermediate energies

Analyzing power of the ${}^{6}{Li} (\vec{n}, {}^{3}H) {}^{4}{He}$ reaction from 0.2 to 2.4 MeV

One- and two-step processes in single-nucleon pickup

Radiative transitions and isospin mixing in ${}^{12}C$

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