Recent Articles

Gamma-Ray Decay in ${}^{36}{Cl}$

A. S. Yousef, E. L. Sprenkel-Segel, and R. E. Segel

Phys. Rev. C 8, 684 (1973) - Published 1 August, 1973

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The decays of 24 states below 4 MeV in ${}^{36}{Cl}$ have been studied by use of $p - γ$ coincidences. The excited states were populated by the ${}^{35}{Cl} (d, p)$ reaction with 3.5-MeV deuterons bombarding enriched Pb ${Cl}_{2}$ targets. Branching ratios were determined and the mean lives of the states were measured by the attenuated-Doppler-shift method. While the level scheme is complex, it is possible to discuss many of the transitions in terms of simple shell-model configurations. Radiative rates among some of the lowest levels are compared with a recent shell-model calculation.

Shell-Model Spectroscopy of $f - p$ -Shell Nuclei with $A \leq 44$

J. B. McGrory

Phys. Rev. C 8, 693 (1973) - Published 1 August, 1973

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The properties of all $f - p$ -shell nuclei with $42 \leq A \leq 44$ have been calculated from one consistent shell model. The model space includes all Pauli-allowed states for all configurations of two, three, or four particles distributed among the four $f - p$ shell orbits. The model Hamiltonian is a one-body plus two-body operator very similar to the "realistic" effective Hamiltonian of Kuo and Brown. Calculated results are given for excitation energies, single-particle transfer spectroscopic factors, electric-quadrupole and magnetic dipole moments, and $B (M 1)$ 's and $B (E 2)$ 's for transitions between low-lying states. The calculated results are in fair agreement with experimental information on these various observables. The results suggest that core-excitation effects are more important in the lower half of the $f_{\frac{7}{2}}$ shell than in the $s - d$ shell.

Isomeric Level of ${}^{50}{Mn}$

C. M. McKenna, K. W. Kemper, and J. W. Nelson

Phys. Rev. C 8, 711 (1973) - Published 1 August, 1973

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The separation energy between the two isomeric states in ${}^{50}{Mn}$ has been determined to be $247_{- 23}^{+ 13}$ keV by measuring the ( $p, n$ ) threshold energies for the onset of the 0.29-sec and 1.76-min activities with the longer-lived state lying above the short-lived state. The $β^{+}$ decay modes of the 1.76-min level in ${}^{50}{Mn}$ are consistent with the $5^{+}$ , $T = 0$ assignment given to the 227 ± 10-keV level previously observed via ${}^{50}{Cr} ({}^{3}{He}, t) {}^{50}{Mn}$ indicating that the levels observed in the two experiments are the same.

[NUCLEAR REACTIONS ${}^{50}{Cr} (p, n) {}^{50}{Mn}$ , $E = 8.5 - 9.0$ MeV; measured threshold energies for 0.29-sec and 1.76-min $β^{+}$ activity, deduced relative separation of isomeric levels.]

Investigation of Branching Ratios Between Isomeric States of ${}^{154}{Tb}$

Jaffy C. F. Lau and James J. Hogan

Phys. Rev. C 8, 715 (1973) - Published 1 August, 1973

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Half-lives and branching ratios of the three isomeric states of ${}^{154}{Tb}$ have been measured from irradiation of gadolinium with 45- and 65-MeV protons. The spin assignments $7^{\pm}$ , $3^{\pm}$ , and $0^{\pm}$ previously suggested were confirmed as representing the $m_{2}$ , $m_{1}$ , and $g$ states, respectively. The branching from the $m_{2}$ to $m_{1}$ isomers was found to be weak, approximately 1.8 ± 0.6%. Branching from the $m_{1}$ to $g$ state was quite substantial, measured to be 21.8 ± 0.7%.

Decay of ${}^{178}{Yb}$ and the Isomers of ${}^{178}{Lu}$

C. J. Orth, W. R. Daniels, D. C. Hoffman, and F. O. Lawrence

Phys. Rev. C 8, 718 (1973) - Published 1 August, 1973

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The neutron-rich radionuclide ${}^{178}{Yb}$ has been produced by the ( $t, p$ ) reaction in the bombardment of enriched ${}^{176}{Yb}$ with 12-MeV tritons. The products of the bombardment were radiochemically separated by an ion-exchange column procedure. The decay of 74 ± 3-min ${}^{178}{Yb}$ includes a 42.4-keV $γ$ transition as well as 348.4- and 390.8-keV transitions which deexcite a 390.8-keV ${}^{178}{Lu}$ level that is populated from ${}^{178}{Yb}$ by a 0.25 ± 0.03-MeV $β$ transition. The total disintegration energy of ${}^{178}{Yb}$ is therefore 0.64 ± 0.03 MeV. The 28.4 ± 0.2-min- ${}^{178}{Lu}$ ground state, which is the sole daughter of ${}^{178}{Yb}$ , decays strongly to the $0^{+}$ and $2^{+}$ members of the ${}^{178}{Hf}$ ground-state band and also to ${}^{178}{Hf}$ excited states at 1260.0, 1309.9, 1323.0, 1362.4, 1434.0, 1443.8, 1496.1, 1513.7, 1561.2, 1566.8, 1772.0, and 1818 keV. A 22.7 ± 0.4-min high-spin isomer of ${}^{178}{Lu}$ was produced in the bombardments only via the ( $t, n$ ) reaction. This isomer undergoes $β$ decay to 1147-(86%) and 1478-(14%) keV states in ${}^{178}{Hf}$ . No isomeric transition in ${}^{178}{Lu}$ was observed.

[RADIOACTIVITY ${}^{178}{Yb}$ from ${}^{176}{Yb}$ ( $t, p$ ), measured $T_{\frac{1}{2}}$ , $E_{β}$ , $E_{γ}$ , $I_{γ}$ , $β - γ$ coinc; deduced $log ft$ , $Q$ . ${}^{178}{Lu}$ -deduced levels, $J$ , $π$ . ${}^{178}{Lu}^{g}$ from ${}^{178}{Yb}$ $β$ decay, measured $T_{\frac{1}{2}}$ , $E_{β}$ , $E_{γ}$ , $I_{γ}$ , $γ - γ$ coin; deduced $log ft$ , $Q$ . ${}^{178}{Lu}^{m}$ from ${}^{176}{Yb} (t, n)$ , measured $T_{\frac{1}{2}}$ , $E_{γ}$ , $I_{γ}$ . ${}^{178}{Hf}$ -deduced levels, $J$ , $π$ . Ge(Li) detectors, enriched target, $E_{t} = 12$ MeV.]

Fission in Stellar Plasma

K. Duorah and H. L. Duorah

Phys. Rev. C 8, 725 (1973) - Published 1 August, 1973

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The fission of heavy nuclides is examined in a dense stellar plasma. The correction in the Coulomb energy due to the interaction between the ion and the induced-electron charge density affects the process of fission and reduces the fission barrier depending upon the physical situation. Shell- and surface-symmetry effects are included in the calculation of the fission barrier as a function of the fissility parameter $χ$ and surface energy of a spherical nuclear drop $E_{s}^{0}$ . The fissionability of some of the heavy elements that are likely precursors of superheavy elements in an $r$ -process chain may adversely affect the formation of superheavy elements in stellar situations.

Neutron Shell Structure in ${}^{125}{Sn}$ by ( $d, p$ ) and ( $α, {}^{3}{He}$ ) Reactions

C. R. Bingham and D. L. Hillis

Phys. Rev. C 8, 729 (1973) - Published 1 August, 1973

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Differential cross sections for ${}^{124}{Sn} (d, p)$ at 33.3 MeV were measured in 5° increments from 12.5 to 47.5° lab. The resolution was about 30 MeV full width at half maximum. The ( $α, {}^{3}{He}$ ) spectra with $\sim 55$ -keV resolution were obtained at 15 and 20° lab with 65.7-MeV $α$ particles. Distorted-wave calculations were made, allowing the assignment of $l$ values, some of which were not made in earlier neutron-transfer studies. Spin assignments and spectroscopic factors were obtained in accordance with the shell model. Consistent spectrocopic factors were obtained from the ( $d, p$ ) and ( $α, {}^{3}{He}$ ) reactions. Sums of spectroscopic factors and centers of gravity are presented for the levels observed and are compared with the results of pairing theory. Essentially all the neutron strength remaining in the neutron shell between $N = 50$ and $N = 82$ was located. Most of the strength in the $2 f_{\frac{7}{2}}$ , $3 p_{\frac{3}{2}}$ , and $1 h_{\frac{9}{2}}$ levels of the next major shell was located.

Alpha Decay of ${}^{251}{Fm}$

I. Ahmad, J. Milsted, R. K. Sjoblom, J. Lerner, and P. R. Fields

Phys. Rev. C 8, 737 (1973) - Published 1 August, 1973

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The $α$ -decay scheme of ${}^{251}{Fm}$ has been investigated by measuring the $α$ -particle, $γ$ -ray, and conversion-electron spectra of mass-separated ${}^{251}{Fm}$ samples. The $α$ spectrum was measured with the Argonne double-focusing magnetic spectrometer and also with a semiconductor detector. 13 $α$ groups were observed with energies and intensities 7.305 (1.5%), 7.251 (0.93%), 7.184 (0.29%), 7.106 (∼0.05%), 6.928 (1.8%), 6.885 (1.7%), 6.833 (87.0%), 6.782 (4.8%), 6.762 (0.38%), 6.720 (0.44%), 6.681 (0.07%), 6.638 (0.56%), and 6.579 (0.26%). The $γ$ rays associated with the $α$ decay of ${}^{251}{Fm}$ were identified in an $α - γ$ coincidence experiment. The multipolarities of prominent transitions were deduced from an $α - e^{-}$ coincidence experiment. The half-life of ${}^{251}{Fm}$ was measured from the decay of $γ$ rays and found to be 5.30 ± 0.08 h. The $α$ branching was determined from the measured (Es $K$ x rays)/ $α$ ratio and was found to be 1.9 ± 0.2%. From these experiments four rotational bands in ${}^{247}{Cf}$ were identified. The ground state and the levels at 383.2, 480.4, and 678.0 keV in ${}^{247}{Cf}$ were given Nilsson-state assignments of ${\frac{7}{2}}^{+} [624 ↓]$ , ${\frac{5}{2}}^{+} [622 ↑]$ , ${\frac{9}{2}}^{-} [734 ↑]$ , and ${\frac{7}{2}}^{-} [743 ↑]$ , respectively. On the basis of the favored $α$ transition the ground state of ${}^{251}{Fm}$ has been assigned to the ${\frac{9}{2}}^{-} [734 ↑]$ single-particle state.

Radioactive Decay of ${}^{130}I^{m}$ , ${}^{130}I^{g}$ , and ${}^{130}{Cs}$ to Levels of ${}^{130}{Xe}$

P. K. Hopke, A. G. Jones, W. B. Walters, A. Prindle, and R. A. Meyer

Phys. Rev. C 8, 745 (1973) - Published 1 August, 1973

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The level structure of ${}^{130}{Xe}$ has been determined from the $β$ decay of ${}^{130}I^{m}$ , ${}^{130}I^{g}$ , and ${}^{130}{Cs}$ . The $γ$ rays emitted in the decay of these species have been observed with high-resolution Ge(Li) detectors and Ge(Li)-Ge(Li) $γ - γ$ coincidence experiments have been performed. Decay schemes for these three isotopes have been deduced. The half-life of ${}^{130}I^{g}$ has been measured as 12.36 ± 0.01 h.

[RADIOACTIVITY ${}^{130}I^{m}$ , ${}^{130}I^{g}$ [from ${}^{129}I (n, γ) {}^{130}{Te} (p, n)$ ], ${}^{130}{Cs}$ [from ${}^{127}I (α, n)$ ]; measured $E_{γ}$ , $I_{γ}$ , $t_{\frac{1}{2}}$ , $γ γ$ coinc. ${}^{130}{Xe}$ deduced levels, $J$ , $π$ . Enriched target. Ge(Li) detectors.]

$g$ Factor Measurements of High-Spin ( $I^{π} \leq 10^{+}$ ) Rotational States

Rafael Kalish, B. Herskind, and G. B. Hagemann

Phys. Rev. C 8, 757 (1973) - Published 1 August, 1973

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The ion implantation perturbed angular correlation (IMPAC) technique was used to measure the precession angles of the $4^{+}$ , $6^{+}$ , $8^{+}$ , and $10^{+}$ rotational states of ${}^{158, 160, 162}{Dy}$ nuclei recoil implanted into magnetized Gd ( $T = 77$ °K). The $Gd (α, 2 n) Dy$ reaction ( $E_{α} = 27$ MeV) on natural Gd was used to populate the levels studied. By comparing the precession results obtained from the ( $α, 2 n$ ) experiments for the $4^{+}$ and $6^{+}$ states to those obtained from Coulomb excitation IMPAC measurements one can conclude the following: (i) $g ({}^{158}{Dy}) = 0.36 \pm 0.06$ for $I^{π} = 4^{+}, 6^{+}, and 8^{+}$ ; (ii) no effect due to final feeding times into the g.s. rotational band can be observed; and (iii) the deduced $g$ factors are constant for members of the g.s. bands of ${}^{158, 160, 162}{Dy}$ up to $I^{π} \leq 8^{+}$ but a possible drop in $g$ for the $10^{+}$ states may be indicated by the data. A reduction in the $g$ factors is theoretically expected to accompany the "back bending" in the energy levels which was recently observed for high-spin rotational states in some deformed nuclei.

Exact Macroscopic Charge-Independent Analysis of Quasielastic ( $p, n$ ) Reactions

G. W. Hoffmann

Phys. Rev. C 8, 761 (1973) - Published 1 August, 1973

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A technique is described in which a strictly charge-independent optical potential for nucleons is derived from empirical neutron and proton potentials which provide optimum fits to the available data. Predictions for the ( $p, n$ ) charge-exchange reaction on ${}^{208}{Pb}$ and ${}^{209}{Bi}$ are made by solving the coupled Lane equations exactly. It is found that both angular-distribution and excitation-function data are fitted quite well, without adjustable parameters.

Decay Energies of Gaseous Fission Products and their Daughters for $A = 138 to 142$

J. P. Adams, G. H. Carlson, M. A. Lee, W. L. Talbert, Jr., F. K. Wohn, J. R. Clifford, and J. R. McConnell

Phys. Rev. C 8, 767 (1973) - Published 1 August, 1973

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The $β$ -decay energies for several mass-separated Xe fission products and their daughters have been measured at the TRISTAN on-line separator facility at the Ames Laboratory research reactor. A well-type plastic scintillator was used in coincidence with a Ge(Li) $γ$ detector to determine $β$ -group end-point energies and deduce $Q$ values. The following $β$ -decay energies have been determined: ${}^{138}{Xe}$ , 2.83 ± 0.08 MeV; ${}^{138}{Cs}$ , 5.29 ± 0.07 MeV; ${}^{139}{Xe}$ , 4.88 ± 0.06 MeV; ${}^{139}{Cs}$ , 4.29 ± 0.07 MeV; ${}^{140}{Xe}$ , 4.06 ± 0.06 MeV; ${}^{140}{Cs}$ , 5.8 ± 0.1 MeV; ${}^{141}{Xe}$ , 6.0 ± 0.1 MeV; ${}^{141}{Cs}$ , 4.98 ± 0.08 MeV; ${}^{141}{Ba}$ , 3.01 ± 0.06 MeV; ${}^{142}{Xe}$ , 4.9 ± 0.1 MeV; and ${}^{142}{Cs}$ , 6.89 ± 0.06 MeV. The decay energies are compared with previous measurements, systematics predictions, and two currently accepted mass relations. The energies are also used to predict the $β$ -decay energies for seven additional nuclei by means of systematics.

Cross Section and Recoil Properties of Copper Isotopes from Uranium Bombarded with 11.5-GeV Protons

S. K. Chang and Nathan Sugarman

Phys. Rev. C 8, 775 (1973) - Published 1 August, 1973

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Cross sections and thick-target recoil properties have been measured for ${}^{61}{Cu}$ , ${}^{64}{Cu}$ , and ${}^{67}{Cu}$ from the interaction of ${}^{238}U$ with 11.5-GeV protons. The kinetic energies are much smaller than expected from a conventional fission process, even for the neutron-rich ${}^{67}{Cu}$ . It is proposed that these Cu nuclides are produced at proton energies above 3 GeV by the fission of low mass nuclei which are the residues of an intranuclear cascade process involving high deposition energy and the emission of fragments prior to fission both in the fast cascade and the evaporation stage.

[NUCLEAR REACTIONS ${}^{238}U (p, Cu)$ , $E = 11.5$ GeV; measured $σ$ and thick-target recoil properties ${}^{61}{Cu}$ , ${}^{64}{Cu}$ , ${}^{67}{Cu}$ ; mechanism proposed.]

$γ$ Rays Following Neutron Capture in ${}^{235}U$ and the Spins of ${}^{235}U$ Resonances

R. G. Graves, R. E. Chrien, D. I. Garber, G. W. Cole, and O. A. Wasson

Phys. Rev. C 8, 781 (1973) - Published 1 August, 1973

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Capture and fission $γ$ rays from epithermal neutron irradiation of ${}^{235}U$ have been identified. The capture $γ$ rays were used to construct a level diagram for ${}^{236}U$ and to determine the spins of the ${}^{235}U$ resonances. Coincidence $γ$ -ray spectra, taken with a large $4 π$ fission neutron detector and Ge(Li) crystal were used to identify prompt-fission $γ$ rays. This apparatus was also used to suppress the background of prompt-fission $γ$ rays in the resonance spectra and to increase the probability of seeing capture $γ$ rays.

Energies of high-energy $γ$ rays identified as due to resonant neutron capture in ${}^{235}U$ are 6396, 5588, 5546, 5487, 5417, and 5292 keV; these populate excited states in ${}^{236}U$ at 149, 957, 999, 1058, 1128, and 1253 keV. Many of the 14 low-energy $γ$ rays identified as capture have been assigned as those representing transitions between these low-lying excited states. On the basis of observing the 5588-keV $γ$ ray, which populates a $2^{+}$ final state in ${}^{236}U$ , the spin-parity of the 2.040-, 12.39-, 14.53-, and 32.05-eV resonances have been assigned as $3^{-}$ . We assigned $4^{-}$ to resonances at 11.67 and 16.10 eV by placing a $5^{+}$ state at 1128 keV. From the work of Schermer et al. and our $3^{-}$ assignment for the 2.040-eV resonance, we conclude that the 0.290- and 1.14-eV resonances are $3^{-}$ and $4^{-}$ , respectively.

On the basis of level systematics in even uranium isotopes and our high- and low-energy capture $γ$ rays, we propose that the 1128-keV level in ${}^{236}U$ is most likely the $5^{+}$ member of the $K^{π}$ , $J^{π} = 2^{+}$ , $2^{+}$ $γ$ -vibrational band.

[NUCLEAR REACTIONS ${}^{235}U$ measured $I_{γ}$ , slow neutrons $(n, γ) (n, F)$ ; deduced $J$ ${}^{235}U$ resonances 0-30 eV, ${}^{236}U$ levels to 1300 keV, delayed-, prompt-fission $γ$ 's.]

In-Beam Electron Conversion from Yrast Levels of ${}^{72, 74, 76, 78}{Se}$ , ${}^{78, 80, 82, 84}{Kr}$ , ${}^{114, 116, 118, 120, 122, 124, 126}{Te}$ , and ${}^{130, 132, 134, 136, 138}{Ce}$ Excited by ( $α, x n$ )

Walter G. Wyckoff and James E. Draper

Phys. Rev. C 8, 796 (1973) - Published 1 August, 1973

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A new in-beam electron spectrometer was used to measure electron conversion intensities of cascade transitions between yrast levels of the nuclei listed above. A few 2+′→2+ transitions were also measured. Altogether, 103 electron lines were measured during and between cyclotron bursts of 25-62-MeV $α$ particles. The conversion coefficients, based on $γ$ intensities from previous work at this laboratory, are compatible with the assignments of all but one of three transitions previously studied in this laboratory. The exception is the 1015-keV transition in ${}^{78}{Kr}$ , earlier obscured by a 1013-keV transition due to Al. These yrast level energies are correlated with a semi-empirical model. The complementary nature of measurements of in-beam angular distributions of $γ$ rays and measurements of electron conversion coefficients is discussed.

[NUCLEAR REACTIONS ${}^{70}{Ge} (α, 2 n)$ , $E = 27.5$ MeV, ${}^{72}{Ge} (α, 2 n)$ , $E = 27.5$ MeV, ${}^{74}{Ge} (α, 2 n)$ , $E = 27.5$ MeV, ${}^{76}{Ge} (α, 2 n)$ , $E = 27.5$ MeV, ${}^{76}{Se} (α, 2 n)$ , $E = 27.5$ MeV, ${}^{78}{Se} (α, 2 n)$ , $E = 25$ MeV, ${}^{80}{Se} (α, 2 n)$ , $E = 25$ MeV, ${}^{82}{Se} (α, 2 n)$ , $E = 25$ MeV, ${}^{112}{Sn} (α, 2 n)$ , $E = 33$ MeV, ${}^{114}{Sn} (α, 2 n)$ , $E = 27.5$ MeV, ${}^{116}{Sn} (α, 2 n)$ , $E = 33$ MeV, ${}^{118}{Sn} (α, 2 n)$ , $E = 27.5$ MeV, ${}^{120}{Sn} (α, 2 n)$ , $E = 27.5$ MeV, ${}^{122}{Sn} (α, 2 n)$ , $E = 27.5$ MeV, ${}^{124}{Sn} (α, 2 n)$ , $E = 25$ MeV, ${}^{130}{Ba} (α, 4 n)$ , $E = 62$ MeV, ${}^{130}{Ba} (α, 2 n)$ , $E = 33$ MeV, ${}^{134}{Ba} (α, 4 n)$ , $E = 62$ MeV, ${}^{136}{Ba} (α, 4 n)$ , $E = 62$ MeV, ${}^{136}{Ba} (α, 2 n)$ , $E = 27.5$ MeV; measured in-beam ce intensities of transitions between yrast levels; from earlier $γ$ intensities deduced ce coefficients to test level assignments; compared usefulness of angular distributions and ce coefficients; compared yrast level energies with EXP model.]

Study of the ( $p, t$ ) Reaction on the Even Gadolinium Nuclei

Donald G. Fleming, Christian Günther, Gudrun Hagemann, Bent Herskind, and Per O. Tjøm

Phys. Rev. C 8, 806 (1973) - Published 1 August, 1973

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The ( $p, t$ ) reaction has been studied at 18 MeV on all the stable even-even Gd targets. A strong population of both $0^{+}$ and $2^{+}$ excited states has been found; the $0^{+}$ ( $β$ vibrations) in the deformed nuclei are all $\approx 15 %$ of the ground-state cross sections. The shape transition at $N = 88$ is observed in the ${}^{154}{Gd} (p, t) {}^{152}{Gd}$ reaction: Two excited $0^{+}$ states are strongly populated. In the deformed Gd nuclei, a distinction between $K = 0$ and $K = 2 2^{+}$ states can be made on the basis of the shapes of their angular distributions. The spectrum observed in the ${}^{152}{Gd} (p, t) {}^{150}{Gd}$ reaction is characteristic of that expected on spherical nuclei, with a relatively strong population of an excited $0^{+}$ state. Distorted-wave Born-approximation calculations are highly successful in fitting the $0^{+}$ transitions but, generally, not the $2^{+}$ and higher spin states.

[NUCLEAR REACTIONS, NUCLEAR STRUCTURE ${}^{160 - 152}{Gd} (p, t) {}^{158 - 150}{Gd}$ , $E = 18$ MeV; measured $σ (θ)$ ; resolution 12 keV. Enriched targets. DWBA analysis.]

X-Ray Isotope Shifts and Variations of Nuclear Charge Radii in Isotopes of Nd, Sm, Dy, Yb, and Pb

P. L. Lee and F. Boehm

Phys. Rev. C 8, 819 (1973) - Published 1 August, 1973

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Isotope shifts of electronic $K α$ x-ray transitions have been measured in isotopes of Nd, Sm, Dy, Yb, and Pb using a curved crystal spectrometer. The $δ 〈 r^{2} 〉$ values of the nuclear charge distribution, as derived from the data, are presented. A combination with results from optical isotope shifts yields an improved accuracy for $δ 〈 r^{2} 〉$ . The optical mass shifts and the electronic coefficients can also be obtained. A comparison with muonic x-ray isotope shifts is presented for Nd and Pb. Consistancy between electronic and muonic data is noted.

Two-Neutron-Hole States in the Even $N = 80$ Nuclei

Michèle Meyer-Lévy and Vjera Lopac

Phys. Rev. C 8, 829 (1973) - Published 1 August, 1973

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Properties of the even $N = 80$ nuclei are calculated by coupling two neutron holes to the quadrupole vibrator. Spectra and transition probabilities are compared with the available experimental data. Structure of the quadrupole moment of the $2_{1}^{+}$ state is discussed in terms of the individual neutron excitations, and properties of the negative-parity stakes are also investigated.

Inverse Problem with Constraints

M. D. Girardeau

Phys. Rev. C 8, 834 (1973) - Published 1 August, 1973

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In a recent letter of the same title by Ernst, Monahan, Shakin, and Thaler, a procedure is presented for constructing a solution to the inverse problem with a set of prescribed wave functions. It is pointed out here that their procedure had in fact already been described in three previous publications, under the name of the method of "completely orthogonalized plane waves."

Effects of $Λ - Σ$ Coupling in ${}_{Λ}^{4}H - {}_{Λ}^{4}{He}$

J. Dabrowski

Phys. Rev. C 8, 835 (1973) - Published 1 August, 1973

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Physical Review C

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Recent Issues

Gamma-Ray Decay in ${}^{36}{Cl}$

Shell-Model Spectroscopy of $f - p$ -Shell Nuclei with $A \leq 44$

Isomeric Level of ${}^{50}{Mn}$

Investigation of Branching Ratios Between Isomeric States of ${}^{154}{Tb}$

Decay of ${}^{178}{Yb}$ and the Isomers of ${}^{178}{Lu}$

Fission in Stellar Plasma

Neutron Shell Structure in ${}^{125}{Sn}$ by ( $d, p$ ) and ( $α, {}^{3}{He}$ ) Reactions

Alpha Decay of ${}^{251}{Fm}$

Radioactive Decay of ${}^{130}I^{m}$ , ${}^{130}I^{g}$ , and ${}^{130}{Cs}$ to Levels of ${}^{130}{Xe}$

$g$ Factor Measurements of High-Spin ( $I^{π} \leq 10^{+}$ ) Rotational States

Exact Macroscopic Charge-Independent Analysis of Quasielastic ( $p, n$ ) Reactions

Decay Energies of Gaseous Fission Products and their Daughters for $A = 138 to 142$

Cross Section and Recoil Properties of Copper Isotopes from Uranium Bombarded with 11.5-GeV Protons

$γ$ Rays Following Neutron Capture in ${}^{235}U$ and the Spins of ${}^{235}U$ Resonances

In-Beam Electron Conversion from Yrast Levels of ${}^{72, 74, 76, 78}{Se}$ , ${}^{78, 80, 82, 84}{Kr}$ , ${}^{114, 116, 118, 120, 122, 124, 126}{Te}$ , and ${}^{130, 132, 134, 136, 138}{Ce}$ Excited by ( $α, x n$ )

Study of the ( $p, t$ ) Reaction on the Even Gadolinium Nuclei

X-Ray Isotope Shifts and Variations of Nuclear Charge Radii in Isotopes of Nd, Sm, Dy, Yb, and Pb

Two-Neutron-Hole States in the Even $N = 80$ Nuclei

Inverse Problem with Constraints

Effects of $Λ - Σ$ Coupling in ${}_{Λ}^{4}H - {}_{Λ}^{4}{He}$

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