We have searched for enhancements of parity violation and combined parity and time reversal violation in the scattering of MeV neutrons from holmium. P-violating analyzing powers, measured by transmission of longitudinally polarized neutrons through unpolarized holmium, were consistent with zero: ${\rho }_P$=(-2.4±2.6)×${10}^{\mathrm{-}4}$ at 7.4 MeV and (-0.2±1.9)×${10}^{\mathrm{-}4}$ at 12.4 MeV. P,T-violating analyzing powers, measured by transmission of vertically polarized neutrons through horizontally polarized holmium, were also consistent with zero: ${\rho }_P$,T=(-0.9±2.0)×${10}^{\mathrm{-}3}$ at 7.1 MeV and (-0.4±2.9)×${10}^{\mathrm{-}3}$ at 11.0 MeV.

Pion-proton elastic scattering measurements at six angles from 101° to 147° center of mass at 66.8 MeV verify previously published differential cross sections which are at variance with earlier data of others and with generally accepted phase-shift solutions which incorporate these earlier data. The present single-arm measurements were made with solid targets and an array of scintillation counters which measured the time of flight of scattered pions.

The alpha-decay branching ratio for the lowest isobaric analog state in ${}_{}{}^{69}{}_{}{}^{}\mathrm{Ge}$ has been measured to be less than 1.0×${10}^{\mathrm{-}2}$. Transitions to this level contribute significantly to the cross section for the capture of high-energy neutrinos by ${}_{}{}^{69}{}_{}{}^{}\mathrm{Ga}$. Since the analog state decays almost exclusively by gamma-ray emission, induced ${}_{}{}^{69}{}_{}{}^{}\mathrm{Ge}$ radioactivity may be used for the detection of high-energy neutrinos in large-scale gallium neutrino detectors.

A rotational band, showing both signature components with a small energy splitting, has been identified in the doubly-odd ${}_{}{}^{138}{}_{}{}^{}\mathrm{Eu}$ nucleus via the ${}_{}{}^{92}{}_{}{}^{}\mathrm{Mo}$${(}^{50}$Cr,3pnγ) reaction. Both γ-γ and γ-n coincidence studies were employed. Comparisons with the lighter ${}_{}{}^{136}{}_{}{}^{}\mathrm{Pm}$, ${}_{}{}^{134}{}_{}{}^{}\mathrm{Pr}$, and ${}_{}{}^{132}{}_{}{}^{}\mathrm{La}$ isotones suggest a π$h_{11/2}$⊗ν$h_{11/2}$ structure.

The β decay of the ${(11/2\mathrm{}}_1^{\mathrm{-}}$ isomer of ${}_{}{}^{141}{}_{}{}^{}\mathrm{Nd}$ to the odd parity states in ${}_{}{}^{141}{}_{}{}^{}\mathrm{Pr}$ has been investigated by measurement of the γ rays of ${}_{}{}^{141}{}_{}{}^{}\mathrm{Pr}$ in the radioactive decay of ${}_{}{}^{141}{}_{}{}^{}\mathrm{Nd}_{}^{\mathrm{m}}{}_{}{}^{}$ and the reaction ${}_{}{}^{139}{}_{}{}^{}\mathrm{La}$(α,2nγ${)}^{141}$Pr. The half-life of the ${(11/2\mathrm{}}_1^{\mathrm{-}}$ isomer of ${}_{}{}^{141}{}_{}{}^{}\mathrm{Nd}$ is determined to be 60.9±1.0 s. An upper limit of 0.010% for the β feeding to the 1117.6 keV (${(11/2\mathrm{}}^{\mathrm{-}}$) state of ${}_{}{}^{141}{}_{}{}^{}\mathrm{Pr}$ is deduced, in disagreement with earlier reports. No detectable β feeding to the 2000.8 keV (${(9/2\mathrm{}}^{\mathrm{-}}$) and 2382.8 keV (${(11/2\mathrm{}}^{\mathrm{-}}$) states of ${}_{}{}^{141}{}_{}{}^{}\mathrm{Pr}$ is observed, and upper limits of 0.020% and 0.012%, respectively, are determined. The ratio of occupancies of protons in the 1$h_{11/2}$ and 2$d_{5/2}$ proton orbitals in ${}_{}{}^{141}{}_{}{}^{}\mathrm{Nd}$ deduced from the β-decay data is compared with that from the spectroscopic factors for pickup and stripping reactions, and the results are discussed.

The Coulomb excitation probability of the first $2^{+}$ state of ${}_{}{}^{64}{}_{}{}^{}\mathrm{Zn}$ was measured observing the backscattered ions of ${}_{}{}^4{}_{}{}^{}\mathrm{He}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, and ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$. The static & and the reduced transition probability B(E2;$O^{+}$→$2^{+}$) have been determined using the reorientation effect. It is found that &=-0.32±0.06 e b (-0.26±0.06 e b) for constructive (destructive) interference involving the second $2^{+}$ state, and that B(E2;$O^{+}$→$2^{+}$) =0.168±0.004${\mathrm{e}}^2$${\mathrm{b}}^2$, for both cases.

Differential cross sections are obtained for the reactions $v_{\mu }+{}_{}{}^{12}{}_{}{}^{}\mathrm{C}\to {}_{}{}^{12}{}_{}{}^{}\mathrm{N}+{\mu }^{-}$ and $e^{-}+{}_{}{}^{12}{}_{}{}^{}\mathrm{C}\to {}_{}{}^{12}{}_{}{}^{}\mathrm{B}+v_e$ for incoming lepton energies of 1 and 3 GeV. The contributions of individual form factors to the differential cross section are also found. A discussion of the utility of these processes for studying the weak nuclear current is given.

Systematics on the location of the quasifree peak observed in electron-nucleus scattering as a function of momentum transfer are related to the momentum-dependent mean field in which the struck nucleon moves. Data on carbon is used as an example.

A great merit of the Dyson boson mapping theory is in its finiteness of boson expansion, but the demerit is in the non-Hermiticity of the Hamiltonian in the boson space. This demerit can be overcome by using the Hermitian treatment proposed in a previous paper. Given here is a precise proof of the method, by which the insufficient explanation in the previous paper is supplemented and the limit of applicability of the treatment is clarified.

The energy levels and B(E2) values of the transitional nuclei ${}_{}{}^{182\mathrm{-}190}{}_{}{}^{}\mathrm{Pt}$ and ${}_{}{}^{180\mathrm{-}188}{}_{}{}^{}\mathrm{Os}$ were calculated in the IBA-1 scheme. A working procedure of optimization for the interaction parameters in IBA-1 is suggested. It was found that the calculated values agreed with the experimental data quite well. The working procedure of the optimization of the parameters in the Hamiltonian was found to be quite efficient.

An approximation method based on the separable expansion of the potential is described that can handle complicated local or nonlocal Coulomb-like potentials in scattering state calculations.

We point out that the deuteron wave functions of Čertov, Mathelitsch, and Moravcsik contain a hidden assumption about the tensor potential at very short distances.

We reply to the preceding Comment.

The recent results of Hahn et al. on the ${}_{}{}^{16}{}_{}{}^{}(\mathit{\alpha }$,γ${)}^{20}$Ne capture reaction are discussed in the light of a microscopic calculation. We suggest that the S factor at 300 keV proposed by Hahn et al. should be substantially increased.

The differential cross section and the analyzing power $A_y$ have been measured for the ${}_{}{}^3{}_{}{}^{}\mathrm{He}(\overrightarrow{p},d)X$ reaction at a deuteron angle of 22° (lab) and a proton momentum of 1.46 GeV/c. Evidence of narrow structure in the missing mass dependence of $A_y$ was observed. The masses of the maxima are compared with other reports of narrow resonance-like structure and with the predictions of theory. Significant correspondence is found.

A very unusual rotational band has been found in ${}_{}{}^{178}{}_{}{}^{}\mathrm{Os}$. It consists of seven regularly spaced transitions about 36 keV apart, which correspond closely to that of the superdeformed band in ${}_{}{}^{152}{}_{}{}^{}\mathrm{Dy}$ after an $A^{\frac{5}{3}}$ normalization. This band populates the yrast band directly, thus permitting rather reliable spin assignments. Based on these, the moment of inertia $J^{\mathrm{}\left(1\right)\mathrm{}}$ is found to be much smaller than the $J^{\mathrm{}\left(2\right)\mathrm{}}$ derived from the above $\gamma$-ray spacings. The most likely interpretation of this is a band with large deformation which is undergoing systematic changes in deformation, pairing, and/or alignment.

I discuss the possibility that a high-intensity 811-keV ${}_{}{}^{37}{}_{}{}^{}\mathrm{Ar}$ neutrino source, produced by neutron capture on separated ${}_{}{}^{36}{}_{}{}^{}\mathrm{Ar}$, could be used to calibrate the ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$ solar neutrino capture cross sections of ${}_{}{}^{71}{}_{}{}^{}\mathrm{Ga}$, ${}_{}{}^{127}{}_{}{}^{}\mathrm{I}$, and other detectors.

Cross sections at six angles from 0° out to 20° in the c.m. system have been measured for the $1^{+}$ → $0^{+}$ transition in the reaction ${}_{}{}^6{}_{}{}^{}\mathrm{Li}\mathrm{}(n,p)\mathrm{}{}_{}{}^6{}_{}{}^{}\mathrm{He}$ at $E_n=118\mathrm{}$ MeV. The 0° cross section is in good agreement with measurements of the same quantity on ${}_{}{}^6{}_{}{}^{}\mathrm{Li}\mathrm{}(n,p)\mathrm{}{}_{}{}^6{}_{}{}^{}\mathrm{Be}$ at similar energies. The 0° ($n,p$) cross section gives a value of 161 ± 17 MeV ${\mathrm{fm}}^3$ for the volume integral of the central part of the spin-isospin interaction; a theoretical value of 161 MeV ${\mathrm{fm}}^3$ is in good agreement. A distorted wave calculation for a pure, Gamow-Teller transition is in fair agreement with the measured ($n,p$) angular distribution. An approximate resolution of the weak $1^{+}$ → $2^{+}$ transition to the first excited state of ${}_{}{}^6{}_{}{}^{}\mathrm{He}$ at 1.8 MeV shows an angular distribution of a very different character corresponding to a transition of mixed angular momenta.

The moment of inertia of the $K=0^{+}$ bands in some of the rare-earth nuclei differ from other low-lying bands. Using the $\frac{1}{N}$ expansion technique, we show that the interacting boson model with arbitrary kinds of bosons and interactions leads to the same moment of inertia for all bands and hence does not allow such a variation to leading order. Since there are usually more ${\mathrm{O}}^{+}$ bands in this region than can be accommodated in collective models, this could provide a useful criterion for the selection of the collective $\beta$ band.