Recent Articles

Two-Neutron Quasiparticle States Observed in ${}^{236}U$ with the ( $d, p$ ) Reaction

K. Katori, A. M. Friedman, and J. R. Erskine

Phys. Rev. C 8, 2336 (1973) - Published 1 December, 1973

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Energy levels in the nucleus ${}^{236}U$ have been studied with the ${}^{235}U (d, p) {}^{236}U$ reaction at bombarding energies from 12 to 16 MeV. The reaction products were analyzed with a split-pole magnetic spectrograph. The strongest transitions are those that lead to two-neutron quasiparticle states. Four rotational bands built upon the ${\frac{7}{2}}^{-} [743] \pm {\frac{1}{2}}^{+} [631]$ and ${\frac{7}{2}}^{-} [743] \pm {\frac{5}{2}}^{+} [622]$ configurations were identified. The bandheads for the $K^{π} = 1^{-}, 4^{-}, 3^{-}, and 6^{-}$ bands are found to be at 970, 1054, 1192, and 1472 keV, respectively. The single-particle cross sections were extracted from the measured cross sections to the members in the rotational bands that involve the ${\frac{1}{2}}^{+} [631]$ orbital. Disagreement with calculated single-particle cross sections was found similar to the corresponding disagreement for cross sections extracted from the data on population of this orbital by transfer reactions on even-even targets. Me asured energy splittings in both ${}^{236}U$ and ${}^{234}U$ are compared with calculated values.

Spin Determination of Intermediate Structure in the Subthreshold Fission of ${}^{237}{Np}$

G. A. Keyworth, J. R. Lemley, C. E. Olsen, F. T. Seibel, J. W. T. Dabbs, and N. W. Hill

Phys. Rev. C 8, 2352 (1973) - Published 1 December, 1973

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A polarized neutron beam and a polarized target have been used to determine spins of 15 intermediate structure groups observed in the fission of ${}^{237}{Np}$ below 1 keV and of 94 resonances observed in transmission below 102 eV. The pulsed neutron beam, from the Oak Ridge electron linear accelerator, was polarized by transmission through a dynamically polarized proton sample. The ${}^{237}{Np}$ , in the ferromagnetic compound Np ${Al}_{2}$ , was cooled by a ${}^{3}{He}$ - ${}^{4}{He}$ dilution refrigerator. Nine individual fine-structure resonances comprising the first group at 40 eV were determined to have the same spin, $J = 3$ , substantiating the current interpretation of intermediate structure in subthreshold fission in terms of the Strutinsky double-humped deformation barrier. Correlation of these results with existing data on the angular distribution of fission fragments from aligned ${}^{237}{Np}$ indicates an apparent admixing of transition states, as evidenced by nonintegral values of the projection quantum number, $K$ .

[NUCLEAR REACTIONS, FISSION ${}^{237}{Np} (n, f)$ , $E = 1$ , 1000 eV; measured $σ (E)$ , $J$ ; ${}^{237}{Np} + n$ total $σ$ ; $E = 1 - 102$ eV; measured $σ (E)$ , $J$ ; polarized neutrons, polarized target.]

Identification of ${}^{236}{Th}$

C. J. Orth, W. R. Daniels, and B. J. Dropesky

Phys. Rev. C 8, 2364 (1973) - Published 1 December, 1973

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The radionuclide ${}^{236}{Th}$ has been produced by the ${}^{238}U (p, 3 p) {}^{236}{Th}$ reaction with 100-MeV protons. The cross section for the reaction is $5_{- 3}^{+ 6}$ μb. Radiochemical separations were performed to isolate the thorium fraction from uranium, neptunium, protactinium, and fission products. The ${}^{236}{Th}$ half-life was determined to be 37.5 ± 1.5 min by measuring the growth and decay of its daughter, 9.1-min ${}^{236}{Pa}$ . Electromagnetic isotope separation was also performed on the thorium samples, and although the resultant sources were very weak, evidence for several $γ$ transitions in the ${}^{236}{Th}$ decay was obtained. A partial decay scheme is proposed for ${}^{236}{Th}$ that includes excited states in ${}^{236}{Pa}$ at 2.1, 112.7, 132, and $\approx 230$ keV. The decay of ${}^{236}{Th}$ is compared with the decay of ${}^{234}{Th}$ , with emphasis on the ${(p_{\frac{1}{2}} - [530] + n_{\frac{1}{2 +}} [631])}_{0 -, 1 -}$ bands in ${}^{234}{Pa}$ and ${}^{236}{Pa}$ .

[RADIOACTIVITY ${}^{236}{Th}$ from ${}^{238}U (p, 3 p)$ , measured $T_{\frac{1}{2}}$ , $E_{γ}$ , $I_{γ}$ . ${}^{236}{Pa}$ deduced levels, $log ft$ . NUCLEAR REACTIONS ${}^{238}U (p, 3 p)$ and ${}^{238}U (p, 3 pxn)$ , $E = 100$ MeV, measured $σ$ .]

Fission Cross Sections of Uranium, Thorium, Bismuth, Lead, and Gold Induced by 58- to 100-MeV Alpha Particles

J. Ralarosy, M. Debeauvais, G. Remy, J. Tripier, R. Stein, and D. Huss

Phys. Rev. C 8, 2372 (1973) - Published 1 December, 1973

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The results presented in this paper have been obtained from experiments using a makrofol (a polycarbonate) detector. After a brief description of the experimental technique, values of measured cross sections are given. These values are discussed in comparison with some known results about spallation reactions, referring to reaction cross sections theoretically calculated from optical models.

Weak-Coupling Model for ${}^{212}{Pb}$ and ${}^{204}{Pb}$

C. M. Ko, T. T. S. Kuo, and J. B. McGrory

Phys. Rev. C 8, 2379 (1973) - Published 1 December, 1973

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The weak-coupling model is applied to the study of the low-lying states of ${}^{212}{Pb}$ and ${}^{204}{Pb}$ . We first obtain the phonon states of ${}^{210}{Pb}$ and ${}^{206}{Pb}$ by shell-model calculations. The states of ${}^{212}{Pb}$ ( ${}^{204}{Pb}$ ) are then obtained by solving the eigenvalue problem in a truncated Hilbert space consisting of a small number of basis vectors, each of which is a product of two phonon states of ${}^{210}{Pb}$ ( ${}^{206}{Pb}$ ). A canonical transformation is used to orthonormalize these two-phonon basis vectors. The energies as well as the wave functions of many low-lying states of ${}^{212}{Pb}$ ( ${}^{204}{Pb}$ ) given by the exact shell-model calculations are reproduced surprisingly well by the weakcoupling model where only three or four low-lying ${}^{210}{Pb}$ ( ${}^{206}{Pb}$ ) phonons are included.

[NUCLEAR STRUCTURE ${}^{212}{Pb}$ , ${}^{204}{Pb}$ ; energies and wave functions calculated in terms of the ${}^{210}{Pb}$ and ${}^{206}{Pb}$ phonons.]

Possible Evidence for Multistep Processes in the ( $d, t$ ) Reaction on Rare-Earth Nuclei

J. V. Maher, G. H. Wedberg, J. J. Kolata, J. C. Peng, and J. L. Ricci

Phys. Rev. C 8, 2390 (1973) - Published 1 December, 1973

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The ( $d, t$ ) reaction has been studied for targets of ${}^{160}{Gd}$ , ${}^{162, 164}{Dy}$ , and ${}^{166, 168}{Er}$ at a deuteron energy of 17 MeV. Although the angular distributions for transitions populating most residual states are well reproduced by distorted-wave Born-approximation (DWBA) calculations, a number of transitions have angular distributions whose shape departs significantly from the DWBA predictions. This paper presents a sample of 10 such anomalous transitions which were selected because their Nilsson model band assignments are reasonably well established and their cross sections are reasonably large relative to cross sections for transitions to well fit levels of the same spin-parity. The levels which exhibit anomalous angular-distribution shapes also tend to have anomalous cross sections (spectroscopic factors) relative to Nilsson model predictions. Also most of these levels are concentrated in the ${\frac{11}{2}}^{-} [505]$ , ${\frac{3}{2}}^{-} [521]$ , and ${\frac{5}{2}}^{+} [642]$ bands.

[NUCLEAR REACTIONS ${}^{160}{Gd} (d, t)$ , ${}^{162, 164}{Dy} (d, t)$ , ${}^{166, 168}{Er} (d, t)$ , $E - 17$ MeV; measured $σ (θ)$ . ${}^{159}{Gd}$ , ${}^{161, 163}{Dy}$ , ${}^{165, 167}{Er}$ levels deduced $S$ . Enriched targets, DWBA analysis, resolution 10 keV, $θ = 8 - 60^{\circ}$ .]

Comparison of Sub-Coulomb Stripping and Analog Resonance Results near Mass 90

J. F. Morgan, R. G. Seyler, and J. J. Kent

Phys. Rev. C 8, 2397 (1973) - Published 1 December, 1973

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The ( $d, p$ ) reaction has been studied, for incident energies below the Coulomb barrier, on ${}^{89}Y$ and ${}^{92}{Mo}$ . These data have been analyzed, together with previously measured sub-Coulomb data on ${}^{90}{Zr}$ and ${}^{92}{Zr}$ , to extract reduced normalizations for the parent states excited in the various residual nuclei. These reduced normalizations were compared with those calculated for the analogs of these parent states using three analog resonance theories. The $R$ -matrix theory gives the best agreement with the ( $d, p$ ) results.

[NUCLEAR REACTIONS ${}^{89}Y$ , ${}^{92}{Mo} (d, p)$ , $E_{d} = 4.0$ MeV; measured $σ (θ)$ . ${}^{90}Y$ , ${}^{91}{Zr}$ , ${}^{93}{Zr}$ , ${}^{93}{Mo}$ levels deduced $Λ_{lj}$ . Compared to IAR $(p, p_{0}) Λ_{lj}$ .]

Neutron-Capture Cross Sections for ${}^{128}{Te}$ and ${}^{130}{Te}$ and the Xenon Anomaly in Old Tellurium Ores

J. C. Browne and B. L. Berman

Phys. Rev. C 8, 2405 (1973) - Published 1 December, 1973

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The ${}^{128}{Te} (n, γ)$ and ${}^{130}{Te} (n, γ)$ cross sections have been measured between 0.5 eV and 7000 eV with an energy resolution of 0.4%. 16 prominent resonances were observed for ${}^{128}{Te}$ , while only six were observed for ${}^{130}{Te}$ in this energy region. The areas under these resonances have been obtained and values for the total radiation widths have been extracted. The average total radiation widths for ${}^{128}{Te}$ and ${}^{130}{Te}$ obtained from these measurements are 33 and 54 meV, respectively. These values are barely consistent with an empirical formula dependent on effective-level-excitation energy and level spacing. The resonance absorption integral derived from these measurements indicates that the ratio of excess ${}^{129}{Xe}$ to ${}^{131}{Xe}$ found in old tellurium ores most likely can be explained by neutron capture in ${}^{128}{Te}$ and ${}^{130}{Te}$ .

High-Energy Neutrons Produced by 740-MeV Protons on Uranium

Richard Madey and Frank M. Waterman

Phys. Rev. C 8, 2412 (1973) - Published 1 December, 1973

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Neutron spectra from 740-MeV proton bombardment of a 30-cm-thick depleted ${}^{238}U$ target were measured from 20 to 500 MeV at 50° and from 5 to 140 MeV at 130° with respect to the proton beam. Measurements were made at the Lawrence Berkeley Laboratory (LBL) 184-in. cyclotron with a self-contained neutron time-of-flight spectrometer. The results are compared with a Monte Carlo calculation of the neutron cascade-evaporation spectrum. While the shapes of the measured and calculated spectra are in general agreement, this comparison shows that the intranuclear cascade model underestimates the production of cascade neutrons at wide angles; furthermore, this comparison shows that this discrepancy increases with increasing angle of emission. At 50°, the yield of neutrons above 25 MeV is 1.4 times that calculated; at 130°, this factor increases to 1.6. For neutrons above 25 MeV, the measured yield at 50° is 5 times greater than that at 130°. From the measurements at 50 and 130°, it is estimated that the total integrated yield above 25 MeV is ${0.9}_{5}$ neutrons per incident proton; the Monte Carlo calculation predicts 0.67 neutrons per incident proton. Below 20 MeV, the results are in agreement with the calculation.

Neutron Spectra at 0° from 724 - MeV Protons on Be and Cu

Frank M. Waterman and Richard Madey

Phys. Rev. C 8, 2419 (1973) - Published 1 December, 1973

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Neutron spectra above 175MeV were measured at 0° from 724-MeV proton bombardment of beryllium and copper. Measurements were made at the 184-in. cyclotron of the Lawrence Berkeley Laboratory with a self-contained time-of-flight spectrometer. The results are compared with the predictions of the intranuclear cascade model for the interval from 0 to 5°. Comparison of the measured and predicted spectra from beryllium indicates that the intranuclear cascade model underestimates the neutron production both in the quasifree peak and in the continuum between 300 MeV and the cutoff energy at 175 MeV. The position of the quasifree peak is observed at the proton bombarding energy in agreement with theory. The measured spectrum from copper shows a substantial contribution in the continuum between 300 MeV and the cutoff energy at 175 MeV. In this continuum region, the measured spectrum from copper increases with decreasing energy, whereas the calculated spectrum decreases with decreasing energy.

[NUCLEAR REACTIONS $Be (p, n)$ , $Cu (p, n)$ , $E = 724$ MeV; measured $n$ spectra above 175 MeV.]

Levels in ${}^{165}{Tm}$ Excited by Decay of 10-min ${}^{165}{Yb}$ and by the ${}^{158}{Gd} ({}^{11}B, 4 n γ)$ Reactions

T. Tamura, I. Rezanka, S. Iwata, J. O. Rasmussen, and J. Alonso

Phys. Rev. C 8, 2425 (1973) - Published 1 December, 1973

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The levels of the deformed nucleus ${}^{165}{Tm}$ were studied both by $β$ decay and by heavy-ion in-beam $γ$ -ray spectroscopy. In addition to confirming the fou r lowest bands $\frac{1}{2} + [411]$ , $\frac{7}{2} + [404]$ , $\frac{7}{2} - [523]$ , and $\frac{1}{2} - [541]$ , evidence is obtained for the $\frac{5}{2} + [402]$ and $\frac{3}{2} + [411]$ bands, and many other higher levels. Several higher members of the ground band are shifted in energy from earlier proposals. Comparison is made with theory both with regard to rotational spacing parameters and to band-head energies.

[RADIOACTIVITY ${}^{165}{Yb}$ ; measured $E_{γ}$ , $I_{γ}$ , $γ γ$ coin. ${}^{165}{Tm}$ deduced levels, $J$ , $π$ , $K$ , $log ft$ .

NUCLEAR REACTIONS ${}^{158}{Gd} ({}^{11}B, 4 n)$ , $E = 47.5 - 88$ MeV; measured $E_{γ}$ , $I_{γ} (θ)$ , $γ γ$ coin. ${}^{165}{Tm}$ deduced levels, $J$ , $π$ , $K$ .]

Levels in ${}^{186}{Os}$ as Populated from Decay of 15.8-h ${}^{186}{Ir}$

K. J. Hofstetter, T. T. Sugihara, and D. S. Brenner

Phys. Rev. C 8, 2442 (1973) - Published 1 December, 1973

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The level scheme of ${}^{186}{Os}$ as populated by the decay of 15.8-h ${}^{186}{Ir}$ has been studied using Ge(Li) detectors in singles and coincidence spectrometers. The coincidence data confirm essentially all of the previously known intraband and interband transitions assigned to the ground-state band (to the $6^{+}$ level), the $γ$ band (to the $7^{+}$ level), and to the $I = 4, 5, and 6$ members of a two-phonon $K = 4$ band. Coincidence data also establish levels in keV at 1194.45, ( $4^{+}$ ); 1461.09, $4^{+}$ ; 1480.3, $4^{+}$ ; 1628.3, $5^{-}$ ; 1775.8, $6^{+}$ ; 1812.5, $5^{+}$ ; 1875.40, $4^{+}$ ; 2056.38, ( $5^{+}$ , $6^{+}$ ); 2081.21, $4^{+}$ ; 2377.3, ( $5^{+}$ , $6^{+}$ ); and 2771.7, $4^{+}$ . The $I^{π}$ assignments are based on multipolarities determined from internal-conversion coefficients. Additional levels based on energy sums are tentatively proposed at 1582.3, 2661.2, 3041.3, 3151.7, 3268.8, and 3413.6 keV. The 15.8-h $1^{186}$ Ir state is believed to have $I^{π} = 5^{+}$ and an argument is presented based on the $β$ -decay pattern that $K = 1$ .

Nuclear Polarization and Charge Parameters Using the Muonic $2 s$ State

P. Martin, G. H. Miller, R. E. Welsh, D. A. Jenkins, R. J. Powers, and A. R. Kunselman

Phys. Rev. C 8, 2453 (1973) - Published 1 December, 1973

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Muonic x-ray transition energies have been measured in ${}^{120}{Sn}$ , ${}^{138}{Ba}$ , ${}^{140}{Ce}$ , ${}^{142}{Ce}$ , and ${}^{206}{Pb}$ using a high-efficiency Ge(Li) detector. Precise measurements and relative-intensity measurements have made it possible to identify transitions to and from the $2 s$ state in each of these targets. There is good agreement between theoretical and experimental relative intensities for these transitions, except for the ${}^{206}{Pb}$ nucleus. These transition energies, together with those from the $2 p - 1 s$ , $3 d - 2 p$ , and $4 d - 2 p$ transitions are used to deduce sets of nuclear charge parameters. It has been found that for each target except ${}^{120}{Sn}$ , the best agreement between theory and experiment is obtained by applying the theoretical nuclear polarization corrections to all levels with $n > 1$ , and varying the nuclear polarization induced by the muon in the $1 s$ state. The nuclear polarization values determined were 5.8 ± 1.5 keV for ${}^{120}{Sn}$ , 6.7 ± 1.4 keV for ${}^{138}{Ba}$ , 6.5 ± 1.3 keV for ${}^{140}{Ce}$ , 7.0 ± 1.4 keV for ${}^{142}{Ce}$ , and 5.5 ± 1.7 keV for ${}^{206}{Pb}$ . These results are in fair agreement with the most recent theoretical predictions.

High-Resolution Study of the Particle-Hole Multiplets in ${}^{208}{Bi}$

G. M. Crawley, E. Kashy, W. Lanford, and H. G. Blosser

Phys. Rev. C 8, 2477 (1973) - Published 1 December, 1973

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Particle-hole multiplets in ${}^{208}{Bi}$ corresponding to the coupling of the $h_{\frac{9}{2}}$ proton with neutron holes in the $p_{\frac{1}{2}}$ , $f_{\frac{5}{2}}$ , $p_{\frac{3}{2}}$ , $i_{\frac{13}{2}}$ , $f_{\frac{7}{2}}$ , and $h_{\frac{9}{2}}$ shells have been observed by the ${}^{209}{Bi} (p, d) {}^{208}{Bi}$ reaction at 35 MeV with an over-all resolution of 5 keV in the deuteron spectra. The results generally show excellent agreement with the weak coupling model except for the $h_{\frac{9}{2}}$ hole states. However the observed $h_{\frac{9}{2}}$ multiplet states do contain a large fraction of the expected strength. There is also substantial agreement with earlier ( $d, t$ ) work except for some spin assignments and in the location of the $2^{-}$ member of the $π h_{\frac{9}{2}}$ , $ν^{- 1} i_{\frac{13}{2}}$ multiplet.

[NUCLEAR REACTIONS ${}^{209}{Bi} (p, d)$ , $E = 35$ MeV; measured levels, $σ (θ)$ , deduced $S$ ].

Exclusion Principle Effects in Pion-Deuteron Scattering near the 3,3 Resonance

N. R. Nath, H. J. Weber, and J. M. Eisenberg

Phys. Rev. C 8, 2488 (1973) - Published 1 December, 1973

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The role of the Pauli exclusion principle in inelastic $π d$ scattering in the 3,3 resonance region is studied using dispersion relations. Estimates are based on the deuteron $S$ state. The 3,3 resonance energy is raised by antisymmetrization in one partial wave ( $J = 1$ ) by 7.5 MeV but only by 1.3 MeV in the total cross section.

[NUCLEAR SCATTERING $d (π, π)$ , $E \sim 150 - 250$ MeV; calculated reaction cross section. Role of Pauli principle, dispersion theory.]

Strong Interaction Effects in Antiproton and Sigma-Minus Baryonic Atoms

Raymond Kunselman and Ryoichi Seki

Phys. Rev. C 8, 2492 (1973) - Published 1 December, 1973

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We calculated x-ray energy-level shifts, widths, and relative x-ray transition yields for antiproton and $Σ^{-}$ atoms throughout the Periodic Table. An optical potential was used and the relationship to experimental determinations is discussed.

[NUCLEAR REACTIONS $\bar{p}$ , $Σ^{-}$ , $K^{-}$ atomic x rays; calculated strong interaction shifts, widths, yields as function of $Z$ , $n$ .]

Remarks on Wave-Function Models of the Half-Shell $T$ Matrix for Two Nucleons

Harvey S. Picker, Edward F. Redish, and G. J. Stephenson, Jr.

Phys. Rev. C 8, 2495 (1973) - Published 1 December, 1973

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Can We Trust ${}^{26}{Al}^{m}$ ? A Search for Competitive Decay Branches

S. Van der Linden, J. P. Deutsch, J. Lehmann, and L. Palffy

Phys. Rev. C 8, 2499 (1973) - Published 1 December, 1973

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Spin and Parity of the 4.82-MeV Level of ${}^{27}{Mg}$

S. Koh and Y. Oda

Phys. Rev. C 8, 2501 (1973) - Published 1 December, 1973

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The spin and parity of the 4.82-MeV level of ${}^{27}{Mg}$ are assigned to be ${1 / 2}^{+}$ by the ${}^{26}{Mg} (d, p) {}^{27}{Mg}$ reaction, in contrast with the assignments by Cujec and Hinds et al. The reaction protons were analyzed with a broad-range magnetic spectrograph and the energy resolution of the whole system was less than 7 keV. This level is a very strong single-particle state and the isobaric-analog state of the 11.758-MeV level of ${}^{27}{A 1}$ .

[NUCLEAR REACTION ${}^{26}{Mg} (d, d)$ , ( $d, p$ ), $E = 3.1$ MeV; measured $σ (E; Θ)$ ; deduced optical-model parameters. ${}^{27}{Mg}$ levels deduced $J$ , $π$ , $S$ , IAS. Enriched target, DWBA analysis, resolution 7 keV; $Θ = 15 - 120^{\circ}$ .]

35-MeV Proton Inelastic Scattering from Low-Lying States in ${}^{207}{Pb}$

W. T. Wagner, G. R. Hammerstein, G. M. Crawley, J. R. Borysowicz, and F. Petrovich

Phys. Rev. C 8, 2504 (1973) - Published 1 December, 1973

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Differential cross sections for the excitation of the first four excited states in ${}^{207}{Pb}$ via the inelastic scattering of 35-MeV protons have been compared with microscopic-model predictions. The effects of noncentral forces in a valence orbital model have been investigated and contributions from exchange and core polarization are important. Addition of an imaginary part to the microscopic form factor was also investigated and gave the best predictions of observed transition strengths.

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Recent Issues

Two-Neutron Quasiparticle States Observed in ${}^{236}U$ with the ( $d, p$ ) Reaction

Spin Determination of Intermediate Structure in the Subthreshold Fission of ${}^{237}{Np}$

Identification of ${}^{236}{Th}$

Fission Cross Sections of Uranium, Thorium, Bismuth, Lead, and Gold Induced by 58- to 100-MeV Alpha Particles

Weak-Coupling Model for ${}^{212}{Pb}$ and ${}^{204}{Pb}$

Possible Evidence for Multistep Processes in the ( $d, t$ ) Reaction on Rare-Earth Nuclei

Comparison of Sub-Coulomb Stripping and Analog Resonance Results near Mass 90

Neutron-Capture Cross Sections for ${}^{128}{Te}$ and ${}^{130}{Te}$ and the Xenon Anomaly in Old Tellurium Ores

High-Energy Neutrons Produced by 740-MeV Protons on Uranium

Neutron Spectra at 0° from 724 - MeV Protons on Be and Cu

Levels in ${}^{165}{Tm}$ Excited by Decay of 10-min ${}^{165}{Yb}$ and by the ${}^{158}{Gd} ({}^{11}B, 4 n γ)$ Reactions

Levels in ${}^{186}{Os}$ as Populated from Decay of 15.8-h ${}^{186}{Ir}$

Nuclear Polarization and Charge Parameters Using the Muonic $2 s$ State

High-Resolution Study of the Particle-Hole Multiplets in ${}^{208}{Bi}$

Exclusion Principle Effects in Pion-Deuteron Scattering near the 3,3 Resonance

Strong Interaction Effects in Antiproton and Sigma-Minus Baryonic Atoms

Remarks on Wave-Function Models of the Half-Shell $T$ Matrix for Two Nucleons

Can We Trust ${}^{26}{Al}^{m}$ ? A Search for Competitive Decay Branches

Spin and Parity of the 4.82-MeV Level of ${}^{27}{Mg}$

35-MeV Proton Inelastic Scattering from Low-Lying States in ${}^{207}{Pb}$

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