The knowledge of reactor antineutrino spectra is necessary for the interpretation of weak-interaction experiments located at nuclear reactors. We calculate the antineutrino and electron spectra accompanying thermal neutron fission of ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}$ and ${}_{}{}^{239}{}_{}{}^{}\mathrm{Pu}$ for various irradiation times. It is stressed that the higher energy part ($E\gtrsim 4$ MeV) of the spectra depends sensitively on the $\beta$-decay characteristics of fission products with experimentally unknown decay schemes. We also discuss the accuracy of a semiempirical conversion of the electron spectrum into the antineutrino spectrum. The resulting ${\overline{\nu }}_e$ spectra are used to calculated cross sections and reaction rates for the inverse neutron $\beta$ decay, weak charged and neutral current induced deuteron disintegration, and the antineutrino-electron scattering.

RADIOACTIVITY, FISSION ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}$, ${}_{}{}^{239}{}_{}{}^{}\mathrm{Pu}$; Antineutrino and electron spectra calculated. $\sigma$ for $\overline{\nu }$ induced reactions analyzed.

Starting from a realistic set of single-particle levels, a microscopic calculation of nuclear level densities is performed. The washing out of the shells and the blocking of the pairing interaction with increasing excitation energy are shown for ${}_{}{}^{240}{}_{}{}^{}\mathrm{Pu}$ and ${}_{}{}^{194}{}_{}{}^{}\mathrm{Hg}$ at different deformations. For ${}_{}{}^{210}{}_{}{}^{}\mathrm{Po}$ the variation with the parameters of the nuclear potential is also discussed. Theoretical values at different deformations and excitation energies are compared with the existing experimental information on level density in ${}_{}{}^{194}{}_{}{}^{}\mathrm{Hg}$, ${}_{}{}^{193}{}_{}{}^{}\mathrm{Hg}$, ${}_{}{}^{193}{}_{}{}^{}\mathrm{Au}$, and ${}_{}{}^{190}{}_{}{}^{}\mathrm{Pt}$.

NUCLEAR STRUCTURE, FISSION ${}_{}{}^{194}{}_{}{}^{}\mathrm{Hg}$, ${}_{}{}^{210}{}_{}{}^{}\mathrm{Po}$, ${}_{}{}^{240}{}_{}{}^{}\mathrm{Pu}$; microscopic calculation of nuclear level densities; shell and pairing effects; dependence on excitation energy, deformation and nuclear parameters; comparison with experiment.

The excitation mechanism of the fission process is studied in terms of a model of particles moving in a deformed time-dependent potential. A residual interaction of the pairing type is incorporated by means of the BCS approximation. No limitations are imposed on the number of quasiparticles. The calculations of the dynamical variables are done by solving numerically the equation of motion of the quasiparticle density and pairing matrices. The set of quasiparticle states is truncated by an energy cutoff. The effects of this cutoff on the results are negligible. Comparison with calculations for ${}_{}{}^{240}{}_{}{}^{}\mathrm{Pu}$ which were restricted to two-quasiparticle excitations only shows that this restriction results in an appreciable underestimate of the total excitation energy. The estimated collective energy is found to be at least one order of magnitude smaller than the dissipated energy for an oscillatory motion of the collective coordinates.

NUCLEAR REACTIONS, FISSION, ${}_{}{}^{240}{}_{}{}^{}\mathrm{Pu}$ internal excitation energy at scission. Time dependent mean field and pairing, equations of motion of quasiparticle density and pairing matrices integrated numerically.

Cross sections for the production of approximately 100 radionuclides in the interaction of silver with 25.2 GeV ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ ions and 300 GeV protons have been determined. The results have been parametrized in terms of a 10-parameter equation which accurately reproduces the measured isobaric- and mass-yield curves. The cross sections of products in the $A=40-106\mathrm{}$ mass range are consistent with the factorization hypothesis. At lower mass numbers, the yields of products formed in reactions induced by ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ ions are enhanced by over a factor-of-2 relative to the ratio of total reaction cross sections. The results are compared with Monte Carlo cascade-evaporation calculations and with the abrasion-ablation model.

NUCLEAR REACTIONS Ag(${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, spallation) and Ag($p$, spallation) $E_{{}_{}{}^{12}{}_{}{}^{}\mathrm{C}}=25.2\mathrm{}$ GeV, $E_P=300\mathrm{}$ GeV. Production cross sections for ∼ 100 radionuclides; deduced charge dispersions and mass-yield curves. Comparison with cascade-evaporation and abrasion-ablation calculations.

The decay of ${}_{}{}^{197}{}_{}{}^{}\mathrm{Tl}$ to ${}_{}{}^{197}{}_{}{}^{}\mathrm{Hg}$ has been studied with mass and radiochemically separated sources. Multiscaled singles spectra of $\gamma$ rays, x rays, and conversion electrons; and, $\gamma -\gamma$ and $\gamma$-x coincidences were obtained. The half-life of ${}_{}{}^{197}{}_{}{}^{}\mathrm{Tl}$ was measured to be 2.83 ± 0.15 hours. A decay scheme has been constructed that incorporates 99.95% of the decay intensity assigned to ${}_{}{}^{197}{}_{}{}^{}\mathrm{Tl}$. The ground state feeding is deduced to be 53 ± 12% of all decays. A level of 1009 keV is observed to decay by an $E0\mathrm{}$ transition to the $\frac{1}{2^{-}}$ ground state. The ${}_{}{}^{197}{}_{}{}^{}\mathrm{Hg}$ level scheme is compared with recent particle-vibrator models.

RADIOACTIVITY ${}_{}{}^{197}{}_{}{}^{}\mathrm{Tl}$ [from W (${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$,$\mathrm{pxn}$), $E=143\mathrm{}$ MeV; ${}_{}{}^{197}{}_{}{}^{}\mathrm{Pb}$ decay, from W (${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, $\mathrm{xn}$), $E=143\mathrm{}$ MeV, Re (${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, $\mathrm{pxn}$), $E=129, 141$ MeV]; mass and radiochemically separated sources. Measured $T_{\frac{1}{2}}$, $E_{\gamma }$, $I_{\gamma }$, $I_{\mathrm{ce}}$, $I_x$, $\gamma \gamma$-coin., $\gamma x$-coin., ICC. Deduced $I_{\beta }$, $log\mathrm{ft}$, $\frac{{\beta }^{+}}{\mathrm{EC}}$, ${}_{}{}^{197}{}_{}{}^{}\mathrm{Hg}$ deduced levels, $J$, $\pi$, $\gamma$-mult. Ge(Li), Si(Li).

Weak neutral-current effects in the internal conversion process are considered. The $K$, $L_{\mathrm{I}}$, and $L_{\mathrm{II}}$ conversions of $M1\mathrm{}$ decays are shown to be uniquely sensitive to the nucleon-axial-vector-electron-vector coupling. Parity violating effects are calculated as a function of the atomic charge and nuclear transition energy and are shown to be ∼${10}^{-6\mathrm{}}$ in favorable cases. Several possible experiments are discussed, as is the estimation of the required nuclear matrix elements.

RADIOACTIVITY weak neutral-current effects in internal conversion; calculated angular asymmetry for oriented $M1\mathrm{}$ decays.

The $\beta$ and subsequent $\gamma$ decays of ${}_{}{}^{90}{}_{}{}^{}\mathrm{Kr}$ have been studied using an on-line isotope separator system. Ge(Li) $\gamma$-ray singles and $\gamma -\gamma$ coincidence measurements were used to construct the level scheme for ${}_{}{}^{90}{}_{}{}^{}\mathrm{Rb}$. This scheme has 31 excited states and includes 96 of the 103 observed $\gamma$-ray transitions. Spin and parity assignments have been deduced using $\beta$-decay $log\mathrm{ft}$ values from $\gamma$-ray intensity balances and internal conversion coefficients determined by on-line magnetic spectrometer measurements. Interpretation of some energy levels is made from a shell-model viewpoint.

RADIOACTIVITY ${}_{}{}^{90}{}_{}{}^{}\mathrm{Kr}$ from ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}$($n$,$f$); measured $E$ and $I$ for $\gamma$, $\mathrm{ce}$; $\gamma -\gamma$ coin. Ge(Li) detectors. Magnetic spectrometer. ${}_{}{}^{90}{}_{}{}^{}\mathrm{Rb}$ deduced ICC, multipolarities, levels, $J$, $\pi$, $log\mathrm{ft}$. Mass-separated ${}_{}{}^{90}{}_{}{}^{}\mathrm{Kr}$ activity.

The nuclides ${}_{}{}^{242}{}_{}{}^{}\mathrm{U}$ and ${}_{}{}^{242}{}_{}{}^{}\mathrm{Np}$ were discovered by chemical separations from targets of ${}_{}{}^{244}{}_{}{}^{}\mathrm{Pu}$ irradiated with 30-160 MeV neutrons followed by $\gamma$-ray and $\beta$-ray spectroscopy. The parent ${}_{}{}^{242}{}_{}{}^{}\mathrm{U}$ decays with $T_{\frac{1}{2}}=16.8\mathrm{}\pm 0.5$ min; 14 $\gamma$ rays ranging from 55.6 keV to 585.0 keV were assigned to its decay. The ${}_{}{}^{242}{}_{}{}^{}\mathrm{Np}$ daughter half-life is 2.2±0.2 min and 39 $\gamma$ rays following its decay have energies between 620.6 and 2370.5 keV. $Q_{{\beta }^{-}}$ of ${}_{}{}^{242}{}_{}{}^{}\mathrm{Np}$ is 2.7±0.2 MeV. A level scheme is proposed for ${}_{}{}^{242}{}_{}{}^{}\mathrm{Pu}$ in which the lowest 7 levels were previously described and 12 new levels are shown. The ground state of ${}_{}{}^{242}{}_{}{}^{}\mathrm{Np}$ is assigned $I^{\pi }=1^{+} \mathrm{and} 6$ excited levels are proposed which accommodate most of the observed $\gamma$ rays from decay of ${}_{}{}^{242}{}_{}{}^{}\mathrm{U}$.

RADIOACTIVITY ${}_{}{}^{242}{}_{}{}^{}\mathrm{U}$, ${}_{}{}^{242}{}_{}{}^{}\mathrm{Np}$ from ${}_{}{}^{244}{}_{}{}^{}\mathrm{Pu}(n, 2pn){}_{}{}^{242}{}_{}{}^{}\mathrm{U}\stackrel{{\beta }^{-}}{\to }{}_{}{}^{242}{}_{}{}^{}\mathrm{Np}$; radiochemistry, Ge(Li) and plastic detectors. ${}_{}{}^{242}{}_{}{}^{}\mathrm{U}$: measured $T_{\frac{1}{2}}$, $E_{\gamma }$, $I_{\gamma }$; deduced $E_{{\beta }^{-}}$, $I_{{\beta }^{-}}$, $log\mathrm{ft}$, decay scheme, $J$, $\pi$, Nilsson state assignments. ${}_{}{}^{242}{}_{}{}^{}\mathrm{Np}$: measured $T_{\frac{1}{2}}$, $E_{\gamma }$, $I_{\gamma }$, $E_{{\beta }^{-}}$, $I_{{\beta }^{-}}$; deduced $log\mathrm{ft}$, decay scheme, $J$, $\pi$, Nilsson assignments.

The forward scattering amplitude of the effective interaction between valence nucleons seems to be essentially momentum independent and small in nuclear matter. From this we can conclude that the effective interaction is close to a surface peaked data interaction. We show that the latter interaction has average particle-particle and particle-hole matrix elements, for low angular momentum, close to those of a surface delta interaction, which is a $\delta$ interaction with all radial integrals set equal.

NUCLEAR STRUCTURE Effective interactions, surface interaction.

The triaxial quantum rotor is studied for large values of angular momentum by the methods of matrix mechanics. Interest is focused on states in the neighborhood of the ground state (yrast state) for a prescribed value of the angular momentum, corresponding to the wobbling motion of classical mechanics. An algorithm is described for obtaining the energy values and the matrix elements of the angular momentum operators in the intrinsic frame, to arbitrary order, as power series in the reciprocal of the numerical value of the angular momentum quantum number, starting with assigned semiclassical values. The program is carried out analytically up to the third approximation. Conditions of validity are given. The structure of the wave functions is described.

NUCLEAR STRUCTURE Asymmetric rotor, solution by matrix mechanics, high spin.

A shell model analysis of the isobaric mass multiplets in the $1p$ shell shows that the isotensor charge dependent contribution (the coefficient of $T_z^2$ in the multiplet relationship) is, in all cases save one, underestimated when only electromagnetic interactions [including ${\left(\frac{v}{c}\right)}^2$ corrections, vacuum polarization, the effect of short range correlations, and finite neutron and proton size] are considered. Furthermore, the discrepancy is nearly twice as large for the seniority zero levels as for the higher seniority states, indicative of the omission of a short range charge dependent interaction. Since the free nucleon-nucleon scattering data indicate that the ($\mathrm{np}$) interaction is ∼2% more attractive than the ($\mathrm{nn}$), the effect of including such a charge dependent nuclear interaction on this coefficient is examined. When a Yukawa potential with range given by the $\pi$-meson Compton wavelength is taken for this potential it is found that theory and experiment can be brought into much better agreement.

NUCLEAR STRUCTURE Shell model calculation of isotensor coefficient in mass-multiplet relationship. $1p$ shell studied; need for isotensor nucleon-nucleon interaction demonstrated.

Using the grand partition function, the stability conditions for nuclear shapes at finite nuclear temperature are derived. Pairing correlations and effects of deformation inducing residual interactions are taken into account.

NUCLEAR STRUCTURE Nuclear level density; finite temperature Hartree-Fock and Hartree-Fock-Bogoliubov; stability conditions; deformation.

A new method is presented for the calculation of operator traces in reasonably large ($N\le 3\times {10}^4$) model spaces. The method is based on the approximation of a multiparticle vector $|s〉$, which simultaneously satisfies the conditions $〈s\left|O_i\right|s〉=\mathrm{Tr}{O}_i$ for a given set of commuting operators $\left\{O_i\right\}$, including the Hamiltonian $H$. An algorithm is presented for finding such an approximation to $|s〉$, which we call $|\overline{s}〉$. To illustrate the method we apply it to the calculation of $\mathrm{Tr}{H}^n$ and $\mathrm{Tr}\left({\overrightarrow{\mathrm{J}}}^2 H^n\right)$, $n=0\mathrm{} \mathrm{to} 8$, in the model space of five nucleons in the $\mathrm{sd}$ shell (${}_{}{}^{21}{}_{}{}^{}\mathrm{Ne}$; $T=\frac{1}{2}$) using the Chung-Wildenthal matrix elements. The calculated results agree with exact diagonalization results to within a few percent. The method is economical in that it requires the storage of only the array $|\overline{s}〉$ and the relatively small arrays for the operators $\left\{O_i\right\}$. It is also particularly appropriate for bit representation of both operators and vectors in terms of a Fock-space basis. An important characteristic of this method is the ease with which submanifolds of a particular symmetry and/or configuration may be projected out for study. This feature was used to calculate configuration traces for higher moments in the ${}_{}{}^{21}{}_{}{}^{}\mathrm{Ne}$ five-nucleon problem as well as to project out the $T=\frac{1}{2}$ manifold. The results in this case demonstrate the inadequacy of low moment truncations in configuration level density calculations.

NUCLEAR STRUCTURE Calculated level density of ${}_{}{}^{21}{}_{}{}^{}\mathrm{Ne}$ using spectral distribution expansion; a new method for evaluating operator moments; results compared with values obtained from exact diagonalization.

We discuss the spatially symmetric configurations for four particles in the two-dimensional version of the $p$ shell and ($s$,$d$) shell with a surface delta interaction and show how these configurations can be described as a system of two interacting bosons. The boson-boson interaction is shown to be predominantly quadrupole with a somewhat weaker hexadecupole component. With increasing numbers of bosons, the quadrupole component tends to dominate.

NUCLEAR STRUCTURE Boson model.

We discuss a simple two-dimensional model containing interacting $s$ and $d$ bosons. This model reproduces the general features of actual collective nuclear spectra, e.g., the transition between vibrational and rotational spectra, and it also gives results close to those of the variable moment of inertia model.

NUCLEAR STRUCTURE Interacting boson model, variable moment of inertia model.

The $T=\frac{3}{2}$ level at 14.174 MeV in ${}_{}{}^{17}{}_{}{}^{}\mathrm{F}$, which appears as a resonance at $E_p=14.435\mathrm{}$ MeV in ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$($p$,$p_0$)${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ has been assigned $J^{\pi }=\frac{3}{2^{-}}$ on the basis of an analysis of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$($\overrightarrow{p}$,$p_0$)${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ measurements. This confirms the assignment of Skwiersky, Baglin, and Parker for this level, and disagrees with most shell-model calculations which predict a level of $J^{\pi }=\frac{1}{2^{-}}$ near this energy.

NUCLEAR STRUCTURE ${}_{}{}^{17}{}_{}{}^{}\mathrm{F}$; Measured ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$($\overrightarrow{p}$,$p_0$); deduced $J^{\pi }\Gamma$, ${\Gamma }_{\mathrm{po}}$ of ${}_{}{}^{17}{}_{}{}^{}\mathrm{F}$ ($T=\frac{3}{2}$) level.

An anomalous behavior has been reported by Hansen et al. for the $\alpha$-decay rates of neutron-deficient lead isotopes. In particular, the $\alpha$ reduced width of ${}_{}{}^{192}{}_{}{}^{}\mathrm{Pb}$ appears to be large. Their $\alpha$-branching ratios, however, are based on (electron capture + ${\beta }^{+}$) decay strengths deduced from $K$ x-ray intensities. More precise values can be obtained if the (electron capture + ${\beta }^{+}$) decay scheme is known. To this end we investigated the decay properties of ${}_{}{}^{192}{}_{}{}^{}\mathrm{Pb}$ with the use of an on-line isotope separator. The nuclide was produced in the ${}_{}{}^{180}{}_{}{}^{}\mathrm{W}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$,$4n$) reaction. Singles and coincidence $\gamma$-ray data as well as singles conversion-electron spectra were accumulated. Also, singles $\gamma$-ray, x-ray, and $\alpha$-particle spectra were taken with the three detectors placed in calibrated geometries. The ${}_{}{}^{192}{}_{}{}^{}\mathrm{Pb}$ $\alpha$ reduced width was found to be lower by a factor of 2 from that of Hansen et al. but nevertheless much larger than one would expect from neighboring $\alpha$-emitting nuclides.

RADIOACTIVITY ${}_{}{}^{192}{}_{}{}^{}\mathrm{Pb}$ measured $T_{\frac{1}{2}}$, $E_{\gamma }$, $I_{\gamma }$, $I_{\mathrm{ce}}$, $E_{\alpha }$, $I_{\alpha }$, $\gamma \gamma$ coin; ${}_{}{}^{192}{}_{}{}^{}\mathrm{Tl}$ deduced levels; ${}_{}{}^{192}{}_{}{}^{}\mathrm{Pb}$ deduced $\alpha$-decay reduced width. Mass separation.

A two-step interpretation for the observed analyzing power of ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$($\overrightarrow{p}$,$t$)${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$($2^{-}$, 8.88 MeV) reaction at 24.4 MeV is reported. The result supports a two-step excitation mechanism for the unnatural-parity state transitions.

NUCLEAR REACTIONS ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$($\overrightarrow{p}$,$t$) ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$($2^{-}$, 8.88 MeV), $E_p=24.4\mathrm{}$ MeV; calculated $\sigma \left(\theta \right)$ and $A\left(\theta \right)$; second-order DWBA analysis.

Cross sections for (${\pi }^{\pm }$,$\pi N$) reactions near the $\Delta \mathrm{}\left(1232\right)\mathrm{}$ resonance on ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$, and ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ leading to mirror levels in ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$/${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$, ${}_{}{}^{23}{}_{}{}^{}\mathrm{Mg}$/${}_{}{}^{23}{}_{}{}^{}\mathrm{Na}$, and ${}_{}{}^{39}{}_{}{}^{}\mathrm{Ca}$/${}_{}{}^{39}{}_{}{}^{}\mathrm{K}$, respectively, were measured by observing their $\gamma$ decays. $\frac{{\sigma }_n}{{\sigma }_p}$ for the first $\frac{1}{2^{-}}$ levels in ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$/${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$ is 1.4±0.2 for ${\pi }^{-}$ and $\frac{1}{1.8}\pm 0.2$ for ${\pi }^{+}$. For ${}_{}{}^{23}{}_{}{}^{}\mathrm{Mg}$/${}_{}{}^{23}{}_{}{}^{}\mathrm{Na}$ and ${}_{}{}^{39}{}_{}{}^{}\mathrm{Ca}$/${}_{}{}^{39}{}_{}{}^{}\mathrm{K}$, the ratios are generally not as closely reciprocal as for ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ and the previously reported ${}_{}{}^{15}{}_{}{}^{}\mathrm{O}$/${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$ $\frac{3}{2^{-}}$ level case. The most strongly excited mirror level pairs are those with large ($p$,$d$) and (${}_{}{}^3{}_{}{}^{}\mathrm{He}$,$d$) spectroscopic factors. The results are interpreted as evidence for the quasifree character of these ($\pi$,$\pi N$) reactions.

NUCLEAR REACTIONS C, Mg, Ca(${\pi }^{\pm }$, $\pi N$), $E=200\mathrm{}$ MeV; detected $\gamma$'s, Ge(Li); measured 90° $\sigma$ for residual mirror levels; deduced $\sigma$ ratios.

$\gamma -\gamma$ directional correlation measurements have been carried out and the following $0^{+}$ spin assignments have been made. ${}_{}{}^{122}{}_{}{}^{}\mathrm{Xe}$: 1149 keV level, ${}_{}{}^{124}{}_{}{}^{}\mathrm{Xe}$: 1269 and 1690 keV, ${}_{}{}^{126}{}_{}{}^{}\mathrm{Xe}$: 1313 keV, ${}_{}{}^{128}{}_{}{}^{}\mathrm{Xe}$: 1583 and 2599 keV. In addition, value of $\delta$ for the 493 keV ($2_2^{+}$, → $2_1^{+}$) transition in ${}_{}{}^{124}{}_{}{}^{}\mathrm{Xe}$ has been measured to be $8_{-3\mathrm{}}^{+7\mathrm{}}$.

RADIOACTIVITY ${}_{}{}^{122,124}{}_{}{}^{}\mathrm{Cs}$ [from ${}_{}{}^{124}{}_{}{}^{}\mathrm{Xe}$ ($p$,$\mathrm{xn}$) enriched ${}_{}{}^{124}{}_{}{}^{}\mathrm{Xe}$]; ${}_{}{}^{126,128}{}_{}{}^{}\mathrm{Cs}$ [from ${}_{}{}^{126,128}{}_{}{}^{}\mathrm{Ba}$, ${}_{}{}^{133}{}_{}{}^{}\mathrm{Cs}$ ($p$,$\mathrm{xn}$)]; measured $\gamma \gamma \left(\theta \right)$, ${}_{}{}^{122,124,126,128}{}_{}{}^{}\mathrm{Xe}$ levels. Deduced $J$, $\gamma$-mixing, Ge(Li), and NaI(Tl) detectors.