The fusion of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ + ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ has been studied in small energy steps in the energy range $45\le E_{\mathrm{lab}}\le 63$ MeV. Fusion cross sections were measured by the detection of evaporation residues in a $\Delta E-E$ particle telescope and by measurement of prompt $\gamma$-ray activity. The fusion excitation functions show relatively smooth behavior with no evidence for oscillatory structure of the magnitude observed in the fusion of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ + ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$.

NUCLEAR REACTIONS ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$+${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$, $E_{\mathrm{lab}}=45-63\mathrm{}$ MeV; measured ${\sigma }_{\mathrm{fusion}}$.

The reaction ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}({}_{}{}^{14}{}_{}{}^{}\mathrm{N}, \alpha )$ ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ has been investigated in the energy range $8.5\le E_{\mathrm{c}.\mathrm{m}.\mathrm{}}\le 11.6$ MeV. The experimental data do not give evidence for the existence of resonances in the ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ + ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$ system.

NUCLEAR REACTIONS ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}({}_{}{}^{14}{}_{}{}^{}\mathrm{N}, \alpha )$, $E=8.5-11.6\mathrm{}$ MeV (c.m.), measured $\sigma (\theta , E)$. No resonances observed.

Evaporation residues from the fusion of ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}$ and ${}_{}{}^{112}{}_{}{}^{}\mathrm{Sn}$ at $E_{{}_{}{}^{32}{}_{}{}^{}\mathrm{S}}=160\mathrm{}$ MeV were studied using an energy-mass spectrometer. The velocity selector of the energy-mass spectrometer was first utilized to measure summed fusion products as a function of velocity setting and reaction angle. In-flight mass separation of the fusion products with the energy-mass spectrometer identified masses 141, 140, and 139 from the evaporation of three to five nucleons from the ${}_{}{}^{144}{}_{}{}^{}\mathrm{Dy}$ compound nucleus. Absolute cross-section measurements are compared to theoretical predictions of the statistical evaporation model. Velocity, angular and charge state distributions of evaporation residues are also compared to calculated values.

NUCLEAR REACTIONS ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}$ + ${}_{}{}^{112}{}_{}{}^{}\mathrm{Sn}$ fusion, $E=160\mathrm{}$ MeV, $\sigma (v, \theta )$. Compared mass, velocity and angular distributions of evaporation residues to statistical particle evaporation theory. Compared charge-state distribution of fusion products to semiempirical predictions.

The transition points in $Z$ and $N$ at which the preference for fragment mass asymmetry changes to symmetry are calculated for spontaneous fission of even-even nuclei with $98\le Z\le 106$ and $150\le N\le 164$. The study is based on the minimum potential energy surface calculations with the asymmetric two-center shell model. The nuclear shapes are constrained either to a fixed value or in some cases to several values of the neck radius, connecting the two halves of the fissioning nucleus. The other shape parameters (including mass asymmetry and elongation) are allowed to vary to obtain the minimum potential energy surface. The potential energy surface calculations are also carried out for the two odd nuclei, ${}_{}{}^{257}{}_{}{}^{}\mathrm{Fm}$ and ${}_{}{}^{262}{}_{}{}^{}105$, for which experimental data on fragment-mass distribution are available. The calculated transition points and the currently available experimental data appear to be in agreement. The fission barriers are also calculated. It is found that, unlike Fm isotopes for whch the second barrier disappears for $N>\mathrm{}154\mathrm{}$, the second barrier remains in elements 102 and 104 for $N>\mathrm{}154\mathrm{}$. These barriers are, however, found to be below the ground state and to disappear eventually for large $N$. The fission of ${}_{}{}^{262}{}_{}{}^{}105$ is discussed in detail and it is argued that this nucleus and also others in this mass region fission adiabatically.

NUCLEAR REACTIONS, FISSION $98<~Z<~106$ and $150<~N<~164$. Calculated transition from fragment-mass asymmetry to symmetry; potential energy surfaces, asymmetric two-center shell model; fission barriers, adiabatic fission.

Energy spectra and angular distributions measured for ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ and ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ emitted from an Ag target bombarded with 210, 300, and 480 MeV protons are analyzed in terms of rapidity and relativistically invariant cross section. This analysis yields constraints on the possible velocities of any systems assumed to be deexciting by statistical processes. Constraints on the masses of emitting systems follow from kinematics, with implications for statistical theories: e.g., independent of the model used, the concept of evaporation is shown by this analysis to be insufficient to explain all of the data.

NUCLEAR REACTIONS $\mathrm{Ag}(p, {}_{}{}^3{}_{}{}^{}\mathrm{He})$, ($p$, ${}_{}{}^4{}_{}{}^{}\mathrm{He}$), $E=210, 300, 480$ MeV; $\theta =20, 90, 160°$; measured $\sigma (E, H_{\mathrm{He}}, \theta )$. Invariant cross section, rapidity analysis; deduced nonevaporation components, constraints on statistical theories.

We attempt to explain threshold pion absorption in nuclei using simple pion rescattering mechanicsms. While the model is successful in the case of the deuteron it leads to 10-30% too small absorption rates in other nuclei. We also study a $\rho \omega$ exchange absorption mechanism that does not act in the deuteron, but find that it can only remove a small part of the remaining discrepancy. The two-nucleon absorption mechanism accounts for 75% of the imaginary part of the $S$-wave pion nucleus optical potential.

NUCLEAR REACTIONS Pion absorption calculated at threshold in light nuclei ${}_{}{}^2{}_{}{}^{}\mathrm{H}$, ${}_{}{}^4{}_{}{}^{}\mathrm{He}$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$, and nuclear matter.

The (${}_{}{}^3{}_{}{}^{}\mathrm{He}$, $n$) reaction on ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ has been used to study the low lying states of ${}_{}{}^{14}{}_{}{}^{}\mathrm{O}$ in the energy range $12 \mathrm{MeV}<E<\mathrm{}24\mathrm{} \mathrm{MeV}$. The experimental angular distributions have been analyzed by the exact finite range as well as zero range distorted-wave Born-approximation theory. Spectroscopic amplitudes were obtained from the shell model calculations of True on the mass 14 systems. It is found that the exact finite-range distorted-wave Born approximation theory gives reasonable to good fits to the experimental angular distributions as well to relative strengths. However, the normalization factor is too small by about 20.

NUCLEAR REACTIONS ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^3{}_{}{}^{}\mathrm{He}, n)$, $10<E<\mathrm{}22\mathrm{}$ MeV, exact-finite-range and zero range DWBA analysis; normalization factors.

The polarization in elastic proton-proton and proton-neutron scattering has been measured at an incident kinetic energy of 1.03 GeV. The proton-proton data have a significantly higher precision than previously obtained in this energy range and extend into the Coulomb interference region. The proton-neutron measurement is the first in this energy region. The results are compared with existing nucleon-nucleon phase shifts solutions.

NUCLEAR REACTIONS Polarization in $\mathrm{pp}$ and $\mathrm{pn}$ scattering, GeV energies, measurement.

We update the relativistic version of the generalized one-boson-exchange potentials on the basis of the recent accumulation of experimental data. We introduce into the vector-meson potentials a damping factor decreasing with energy as well as an enhancing factor in the scalar-meson potential increasing with energy in accord with the asymptotic power-law energy dependence of the potentials required in high-energy physics. With these factors we obtain a markedly improved fit to all phase parameters. Thus, with 11 adjusted parameters we obtain a satisfactory description of the $N-N$ interaction for the 0-515 MeV energy range.

NUCLEAR STRUCTURE Relativistic one-boson-exchange potentials with asymptotic power-law energy dependence. Theoretical fits to phase shifts and observables.

Collisions between nuclei are studied by means of a simple extension of the Glauber high energy approximation. An expression for the optical phase shift function, exact within the framework of the Glauber approximation, is expanded in an infinite series and includes the effects of nuclear correlations. The first term corresponds to the standard optical limit result of the Glauber theory, and the higher order corrections arise from the processes in which one or more nucleons of either nucleus can undergo multiple collisions. The center-of-mass correlation is treated consistently so that our results do not exhibit the large-$q$ divergence which characterizes the usual optical limit. It is shown that with realistic constraints on nucleon-nucleon total cross sections, the optical phase shift function does not approach the usual optical limit result when the mass numbers of the colliding nuclei become very large. With a proper treatment of center-of-mass correlations, the optical phase shift series converges rapidly for light nuclei and allows one to perform realistic calculations. The effects of higher order corrections on total and inelastic cross sections and on elastic scattering intensities are examined. The effects of the Coulomb field are included in an average phase approximation and results are compared with measurements.

NUCLEUS REACTIONS Nucleus-nucleus scattering. Corrections to the optical limit in high energy approximation. Center-of-mass correlation effects. Calculated $\sigma (E, \theta )$, total cross sections, inelastic cross sections, and slope parameters.

We present isospin-zero phase-shift analyses of the world $\mathrm{np}$ data near 325 MeV. Inclusion of new $D_t$ (and $P$) measurements produces a unique $I=0\mathrm{}$ phase-parameter solution; however, $\delta \left({}_{}{}^3{}_{}{}^{}G_4^{}{}_{}{}^{}\right)$ is almost 5 standard deviations below theoretical predictions. Fixing this phase shift and the other $G$-wave phase shifts at theoretical values results in a set of lower partial-wave phase parameters which interpolate well with phase shifts at adjacent energies. Theoretical consequences of this phase shift set are discussed.

NUCLEAR REACTIONS $E=325\mathrm{}$ MeV; nucleon-nucleon isospin-0 phase-shift analysis.

The levels of ${}_{}{}^{158}{}_{}{}^{}\mathrm{Dy}$ populated in the decay of 11-min ${}_{}{}^{158}{}_{}{}^{}\mathrm{Ho}_{}^g{}_{}{}^{}$ and 28-min ${}_{}{}^{158}{}_{}{}^{}\mathrm{Ho}_{}^m{}_{}{}^{}$ in equilibrium with 2.3-h ${}_{}{}^{158}{}_{}{}^{}\mathrm{Er}$ have been studied using singles Ge(Li) detectors, a Compton-suppression spectrometer and a Ge(Li)-Ge(Li) coincidence spectrometer. We firmly establish $K=0\mathrm{}$ one-phonon $\beta$-vibrational, $K=2\mathrm{}$ one-phonon $\gamma$-vibrational, $K=2\mathrm{}$ two-phonon ($\beta +\gamma$)-vibrational, and $K=4\mathrm{}$ two-quasineutron bands with new $\gamma$-ray singles, coincidence, and multipolarity evidence. Members of the $K=0, 1, 2, \mathrm{and} 3$ octupole vibrational bands are identified and compared to theoretical calculations. One-phonon octupole vibrational bands are proposed with the following assignments $I^{\pi }$(keV): $K=0\mathrm{}$: $1^{-}$(1608.0), $3^{-}$(1671.8), $5^{-}$(1818.7); $K=1\mathrm{}$: $1^{-}$(1441.7), $2^{-}$(1501.1), $3^{-}$(1513.6), $4^{-}$(1618.4), $5^{-}$(1634.5); $K=2\mathrm{}$: $2^{-}$(1371.7), $3^{-}$(1397.2), $4^{-}$(1518.5), $5^{-}$(1528.1); and $K=3\mathrm{}$: $3^{-}$(2409.6). A limiting value $\rho \ge 0.09$ has been measured for the monopole matrix element of the 990.6-keV $\beta$ vibration and a new low-lying $0^{+}$ state is reported at 1710.2 keV which may have collective character.

RADIOACTIVITY ${}_{}{}^{158}{}_{}{}^{}\mathrm{Ho}$ [from ${}_{}{}^{149}{}_{}{}^{}\mathrm{Sm}$ (${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, $3n$)(2.3-h, EC, ${\beta }^{+}$) ${}_{}{}^{158}{}_{}{}^{}\mathrm{Ho}$]; measured $E\gamma$, $I\gamma \gamma \gamma$ coin; deduced $log\mathrm{ft}$. ${}_{}{}^{158}{}_{}{}^{}\mathrm{Dy}$ deduced levels, $J$, $\pi$, ${\alpha }_K$, $\gamma$ multipolarities. Ge(Li) detectors, enriched targets.

The half-lives of the Fermi super-allowed $\beta$-ray transitions from ${}_{}{}^{14}{}_{}{}^{}\mathrm{O}$ and ${}_{}{}^{38}{}_{}{}^{}\mathrm{K}_{}^m{}_{}{}^{}$ have been measured by multiscaling $\gamma$ rays (from ${}_{}{}^{14}{}_{}{}^{}\mathrm{O}$) or $\beta$ rays (from ${}_{}{}^{38}{}_{}{}^{}\mathrm{K}_{}^m{}_{}{}^{}$) detected in a plastic scintillator. The activities were made via the reactions ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^3{}_{}{}^{}\mathrm{He}, n){}_{}{}^{14}{}_{}{}^{}\mathrm{O}$ at $E_{{}_{}{}^3{}_{}{}^{}\mathrm{He}}=2.9\mathrm{}$ MeV and ${}_{}{}^{35}{}_{}{}^{}\mathrm{Cl}(\alpha , n)$ ${}_{}{}^{38}{}_{}{}^{}\mathrm{K}_{}^m{}_{}{}^{}$ at $E_{\alpha }=8.0\mathrm{}$ MeV respectively. Results for the half-lives were as follows: ${}_{}{}^{14}{}_{}{}^{}0$-70.613 ± 0.025 sec, and ${}_{}{}^{38}{}_{}{}^{}\mathrm{K}_{}^m{}_{}{}^{}$-921.71±0.65 msec. Recommendations as to the "best" half-life values for the set of eight most accurately measured Fermi super-allowed transitions are presented and comments are made on the present status of knowledge of the nucleon's mean quark charge as extracted from such transitions following acceptance of Cabibbo universality and the gauge theories as exploited by Sirlin. The value recommended for the vector coupling coefficient effective for nucleon $\beta$ decay (including the "inner" radiative correction) is $g_{\beta \mathrm{V}}^R=(1.412\mathrm{}48\pm 0.00044)\times {10}^{-49\mathrm{}}$ erg ${\mathrm{cm}}^3$.

NUCLEAR REACTIONS Radioactivity ${}_{}{}^{14}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{38}{}_{}{}^{}\mathrm{K}_{}^m{}_{}{}^{}$; measured $T_{\frac{1}{2}}$; deduced $\mathrm{ft}$ values; compared with systematics.

${}_{}{}^{121}{}_{}{}^{}\mathrm{Sn}_{}^m{}_{}{}^{}$ has been found to decay by a highly converted isomeric transition to ${}_{}{}^{121}{}_{}{}^{}\mathrm{Sn}_{}^g{}_{}{}^{}$ with a branching fraction of 0.776±0.020. The $K$-shell internal-conversion coefficient ${\alpha }_K$ for the 37.2-keV transition in Sb, has been found to be 9.45±0.33.

RADIOACTIVITY ${}_{}{}^{121}{}_{}{}^{}\mathrm{Sn}_{}^m{}_{}{}^{}$; $\beta \gamma$ coin, ${\mathrm{I}}_{\gamma }$, ICC in Sb; deduced isomeric branching fraction.

A theory of radiative muon capture, with applications to nuclear spin and isospin doublets, is formulated on the basis of the conservation of the hadronic electromagnetic current, the conservation of the hadronic weak polar current, the partial conservation of the hadronic weak axial-vector current, the SU(2) × SU(2) current algebra for the various hadronic currents, and a simplifying dynamical approximation for the hadron-radiating part of the transition amplitude—the "linearity hypothesis." The resultant total transition amplitude, which also includes the muon-radiating part, is worked out explicitly and applied to treat the processes ${\mu }^{-}p\to {\nu }_{\mu }n\gamma$ and ${\mu }^{-}{}_{}{}^3{}_{}{}^{}\mathrm{He}\to {\nu }_{\mu }{}_{}{}^3{}_{}{}^{}\mathrm{H}\gamma$.

RADIOACTIVITY ${\mu }^{-}p\to {\nu }_{\mu }n\gamma$ and ${\mu }^{-}{}_{}{}^3{}_{}{}^{}\mathrm{He}\to {\nu }_{\mu }{}_{}{}^3{}_{}{}^{}\mathrm{H}\gamma$; general theory of radiative muon capture with applications to nuclear spin and isospin doublets.

Distorted-wave Born-approximation and coupled channel analyses of differential cross sections and analyzing powers have been performed for inelastic polarized proton-scattering data measured at an incident proton energy of 20.3 MeV. Collective and microscopic models have been used to describe the low-lying states of ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$. The results obtained for the cross sections and analyzing powers with the rotational model description are in reasonably good agreement with the data. The distorted-wave Born-approximation analysis using shell-model wave functions gives satisfactory fits to the shape of the cross sections for some levels but very serious disagreements for the analyzing powers of almost all states, suggesting the need to include higher-order effects.

NUCLEAR REACTIONS ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}(p, p^{\prime })$, $E=20.3\mathrm{}$ MeV; calculated $\sigma \left(\theta \right)$ and analyzing power for 10 levels; macroscopic and microscopic DWBA calculations.

The theory of radiative muon capture, as formulated in a previous paper on the basis of the conservation of the hadronic electromagnetic current, the conservation of the hadronic weak polar current, the partial conservation of the hadronic weak axial-vector current, the SU(2)×SU(2) current algebra for the various hadronic currents, and the "linearity hypothesis," is applied to the process ${\mu }^{-}{}_{}{}^{12}{}_{}{}^{}\mathrm{C}\to {\nu }_{\mu }{}_{}{}^{12}{}_{}{}^{}\mathrm{B}\gamma$. The resultant total transition amplitude is worked out explicitly and used to calculate various observable quantities.

RADIOACTIVITY ${\mu }^{-}{}_{}{}^{12}{}_{}{}^{}\mathrm{C}\to {\nu }_{\mu }{}_{}{}^{12}{}_{}{}^{}\mathrm{B}\gamma$; application of a general theory of radiative muon capture to nuclear spin and isospin [$0^{+}$, 0] → [$1^{+}$, 1] transitions.

Experimental total $\beta$-decay energies of strongly neutron-rich indium isotopes are presented. The samples were produced as mass-separated fission products by using the on-line isotope separator technique. By means of a Si(Li)-detector system, $\beta$ spectra were recorded in coincidence with different $\gamma$ gates, and $Q_{\beta }$ values for isomers of ${}_{}{}^{120-129}{}_{}{}^{}\mathrm{In}$ were deduced. The atomic mass excess is derived for these nuclei, and comparisons are made with mass formula predictions. The mean uncertainty of the experimental mass excesses is 0.11 MeV. The precision of the mass formulas chosen for the comparison varies widely with rms deviations ranging from 0.21 to 1.36 MeV. For the isotopes ${}_{}{}^{124-129}{}_{}{}^{}\mathrm{In}$ the possibility of delayed-neutron emission is discussed.

RADIOACTIVITY ${}_{}{}^{120-129}{}_{}{}^{}\mathrm{In}$: Measured $\beta -\gamma$ coincidences for isomers: deduced total $\beta$-decay energies, atomic mass excesses, delayed-neutron windows; comparison with mass formulas. Mass-separated fission products, Si(Li)-detectors, Ge(Li)-detector, NaI(T1)-detectors.

The decay of oriented ${}_{}{}^{110}{}_{}{}^{}\mathrm{Ag}_{}^m{}_{}{}^{}$ has been studied through singles and coincidence counting. The nuclear polarization was obtained by using a dilution refrigerator and the hyperfine field in iron. Ge(Li) singles spectra yielded the following $\frac{E2\mathrm{}}{M1\mathrm{}}$ mixing ratios: $\delta \left(447\mathrm{} \mathrm{keV}\right)=-0.40\mathrm{}\pm 0.06$, $\delta \left(678\mathrm{} \mathrm{keV}\right)=-0.36\mathrm{}\pm 0.03$, $\delta \left(687\mathrm{} \mathrm{keV}\right)=-1.65\mathrm{}\pm 0.09$, $\delta \left(707\mathrm{} \mathrm{keV}\right)=-1.42\mathrm{}\pm 0.07$, $\delta \left(1384\mathrm{} \mathrm{keV}\right)=-0.39\mathrm{}\pm 0.02$, $\delta \left(1505\mathrm{} \mathrm{keV}\right)=-1.09\mathrm{}\pm 0.09$. In a time-reversal invariance test the phase angles $\eta$ of the mixing ratio $\delta =\left|\delta \right|e^{i\eta }$ were measured through the observation of $\gamma -\gamma$ directional correlations in the daughter ${}_{}{}^{110}{}_{}{}^{}\mathrm{Cd}$. Three NaI detectors allow six coincidence combinations to be measured for both the 1505-658 keV and the 1384-(885)-658 keV cascades. We found $sin\eta \left(1505\mathrm{} \mathrm{keV}\right)=(1.5\mathrm{}\pm 2.2)\times {10}^{-3\mathrm{}}$ and $sin\eta \left(1384\mathrm{} \mathrm{keV}\right)=(-1.7\mathrm{}\pm 5.1)\times {10}^{-3\mathrm{}}$, consistent with time-reversal invariance. The $g$ factor of the 658 keV state in ${}_{}{}^{110}{}_{}{}^{}\mathrm{Cd}$ was determined to be 0.28 ± 0.05.

RADIOACTIVITY ${}_{}{}^{110}{}_{}{}^{}\mathrm{Ag}_{}^m{}_{}{}^{}$ (oriented); measured $I_{\gamma }(\theta =90\mathrm{}°, T)$. ${}_{}{}^{110}{}_{}{}^{}\mathrm{Cd}$; deduced $\gamma$ mixing. ${}_{}{}^{110}{}_{}{}^{}\mathrm{Cd}$; measured $\gamma \gamma$ coin, time-reversal test; deduced mixing ratio phase angles, 1505 and 1384 keV $\gamma$ rays; 658 keV level deduced $g$.

The ${}_{}{}^{102}{}_{}{}^{}\mathrm{Tc}_{}^g{}_{}{}^{}$ activity has been obtained by chemical separation of the parent nucleus ${}_{}{}^{102}{}_{}{}^{}\mathrm{Mo}$ from an U${\mathrm{O}}_2$(N${\mathrm{O}}_3$)${}_2{}^{}{}_{}{}^{}\mathrm{·}$6 ${\mathrm{H}}_2$O sample, irradiated with 20-MeV bremsstrahlung. Four successive Ge(Li) spectra were measured. Several new $\gamma$ rays were found and the energy values and relative intensities of the known $\gamma$ lines are compared to the existing data. Levels at 0, 475.07, 943.65, 1103.15, 1580.83, and 1837.10 keV were found to be fed in the ${\beta }^{-}$ decay of ${}_{}{}^{102}{}_{}{}^{}\mathrm{Tc}_{}^g{}_{}{}^{}$. Based on the well-known, spectrometrically determined, yield for mass 102 in the thermal neutron fission of ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}$ the absolute intensity for the 475.0 keV $\gamma$ ray has been determined. A value of (6.25±1.0)% was found. Also the absolute intensities of the other observed $\gamma$ lines could be obtained. Intensities for all $\beta$ branches and corresponding $log\mathrm{ft}$ values were calculated. The results differ considerably from those given in the literature. The systematics of the energy spectra of the doubly even Ru isotopes in the mass region $94<A<\mathrm{}110\mathrm{}$ are discussed. The total potential energy surface for quadrupole deformation is calculated. Energy spectra for ${}_{}{}^{102}{}_{}{}^{}\mathrm{Ru}$ are calculated within the interacting boson model and also treating cubic anharmonicities in perturbation theory. They are compared with the experimental results.

RADIOACTIVITY ${}_{}{}^{102}{}_{}{}^{}\mathrm{Tc}_{}^g{}_{}{}^{}$ [from ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}(n_{\mathrm{th}}, f)$ and ${}_{}{}^{238}{}_{}{}^{}\mathrm{U}(\gamma , f)$, $E_{{\gamma }_{max}}=20\mathrm{}$ MeV, chemical separation of Mo]. Measured $E_{\gamma }$, $I_{\gamma }$. ${}_{}{}^{102}{}_{}{}^{}\mathrm{Tc}_{}^g{}_{}{}^{}$ deduced $log\mathrm{ft}$ ${}_{}{}^{102}{}_{}{}^{}\mathrm{Ru}$ deduced levels, $j$, $\pi$.