Recent Articles

High-Energy States in ${}^{49}V$ and the Decay of ${}^{49}{Cr}$

O. B. Okon, H. Bakhru, M. K. Dewanjee, and I. L. Preiss

Phys. Rev. C 7, 239 (1973) - Published 1 January, 1973

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The presence of new high energy states in ${}^{49}V$ at 754, 1021.3, 1141.9, 1514.2, and 1661.6 keV has been observed. The relative $γ$ -ray intensity and $β$ -decay branching ratios in the decay of ${}^{49}{Cr}$ have been remeasured in the high-resolution Ge(Li) detectors. The results are notably different from previously reported values. The half-life of the 90.7-keV state has been measured with the delayed coincidence technique as 0.33 ± 0.02 nsec. The spin and parity assignments of some of the levels in ${}^{49}V$ are discussed.

Study of Level Structure of ${}^{78}{Kr}$

H. Bakhru, I. M. Ladenbauer-Bellis, and B. Jones

Phys. Rev. C 7, 243 (1973) - Published 1 January, 1973

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${}^{78}{Rb}$ and ${}^{78 m}{Rb}$ were produced via the following heavy-ion reactions: ${}^{65}{Cu} ({}^{16}O, 3 n) {}^{78, 78 m}{Rb}$ and ${}^{69}{Ga} ({}^{12}C, 3 n) {}^{78, 78 m}{Rb}$ . The half-lives of ${}^{78}{Rb}$ and ${}^{78 m}{Rb}$ were measured and found to be 6.5 ± 0.5 min and 4.2 ± 0.2 min, respectively. The study of singles $γ$ -ray spectra and the use of two large Ge(Li) detectors in coincidence revealed the existence of several previously unreported transitions in ${}^{78}{Kr}$ . Decay schemes are proposed for ${}^{78}{Rb}$ and ${}^{78 m}{Rb}$ , populating the following levels in ${}^{78}{Kr}$ : 455.1, 1119.7, 1148.0, 1564.9, and 1978.5 keV. Spin and parity assignments of some of the levels of ${}^{78}{Kr}$ are discussed.

Neutron-Nucleus Total and Inelastic Cross Sections: 900 to 2600 $\frac{MeV}{c}$

Walter Schimmerling, Thomas J. Devlin, Warren W. Johnson, Kirby G. Vosburgh, and Richard E. Mischke

Phys. Rev. C 7, 248 (1973) - Published 1 January, 1973

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Total cross sections have been measured for neutrons on 16 targets: 12 selected elements, muscle-tissue-equivalent plastic, water, shielding concrete, and plastic scintillator. The momenta of the incident neutrons 900 to 2600 $\frac{MeV}{c}$ were determined by time of flight. Over-all uncertainties are of the order of 5%. The dependence of the total cross sections on the atomic weight of the targets can be approximated by an $A^{β}$ law, where $β$ varies with momentum from 0.72 to 0.84. The momentum dependence of the cross sections is found to be similar to that of neutron-proton cross sections. Results and similar analyses are also presented for total inelastic cross sections.

Parity Mixing and the Nuclear Structure of ${}^{183, 184}W$ and Nuclear Spin-Lattice Relaxation Following the Decays of Oriented ${}^{183, 184 g, 184 m}{Re}$

K. S. Krane, C. E. Olsen, and W. A. Steyert

Phys. Rev. C 7, 263 (1973) - Published 1 January, 1973

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A small, but nonvanishing, parity impurity has been determined in the 1285-keV $5^{-}$ level of ${}^{184}W$ , based on observation of the forward-backward asymmetry of the strongly hindered 922-keV $E 1 γ$ ray from low-temperature polarized ${}^{184 m}{Re}$ . This result has been interpreted in terms of admixing by the weak interaction of a nearby opposite-parity level, based on estimates of the appropriate transition probabilities. Observations of the 0°-90° anisotropies of the angular distribution of $γ$ rays from oriented ${}^{183, 184 g, 184 m}{Re}$ have yielded values for a number of ${}^{183, 184}W$ mixing ratios; in particular, $\frac{E 3}{E 1}$ mixing has been observed in the 922- and 538-keV $γ$ rays. The ${}^{183, 184 g, 184 m}{Re}$ magnetic moments and the corresponding spin-lattice relaxation times of Re in Fe have been determined.

Kinetic Energy Distributions in the Spontaneous Fission of ${}^{250}{Cm}$ and ${}^{250}{Cf}$

Darleane C. Hoffman, George P. Ford, and John P. Balagna

Phys. Rev. C 7, 276 (1973) - Published 1 January, 1973

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The kinetic energy distributions of coincident fragments from the spontaneous fission of ${}^{250}{Cm}$ and ${}^{250}{Cf}$ have been measured with silicon surface-barrier detectors. From these data, pre-neutron-emission kinetic energy and mass distributions have been calculated. The most probable value of the pre-neutron-emission total kinetic energy is 179.8 MeV for ${}^{250}{Cm}$ , and 184.3 MeV for ${}^{250}{Cf}$ . The resultant mass-yield curves are typical of asymmetric fission. The results are compared with measurements for other curium and californium isotopes.

Studies of Mendelevium Isotopes with Mass Numbers 248 Through 252

Pirkko Eskola

Phys. Rev. C 7, 280 (1973) - Published 1 January, 1973

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Five isotopes of mendelevium, with mass numbers 248 through 252, were studied by means of $α$ -particle spectroscopy. The isotopes were produced by bombarding ${}^{241}{Am}$ and ${}^{243}{Am}$ targets with ${}^{12}C$ and ${}^{13}C$ ions accelerated by the Berkeley heavy-ion linear accelerator. The half-lives of the nuclides and the energies of the main $α$ -particle groups, respectively, were observed to be: ${}^{248}{Md}$ : 7 ± 3 sec, 8.32 ± 0.02 MeV; ${}^{249}{Md}$ : 24 ± 4 sec, 8.03 ± 0.02 MeV; ${}^{250}{Md}$ : 52 ± 6 sec, 7.75 ± 0.02 MeV; ${}^{251}{Md}$ : 4.0 ± 0.5 min, 7.55 ± 0.02 MeV; ${}^{252}{Md}$ : 2.3 ± 0.8 min, no $α$ decay. The $α$ -particle energies of ${}^{245}{Es}$ , ${}^{246}{Es}$ , and ${}^{247}{Es}$ , produced mainly by ( $HI, α xn$ ) reactions, were measured to be 7.73 ± 0.02, 7.36 ± 0.03, and 7.31 ± 0.03 MeV, respectively, and the half-life of ${}^{247}{Es}$ was found to be 4.7±0.3 min. Excitation curves for producing the Md isotopes and some other activities are presented. Estimates for the electron-capture branching of the Md isotopes are given. $α$ -decay hindrance factors were calculated using the spin-independent equations of Preston. The $α$ -decay energy systematics of the mendelevium isotopes is discussed.

Decay of 5.9-Day ${}^{145}{Eu}$ to Levels in ${}^{145}{Sm}$

E. Newman, K. S. Toth, and I. R. Williams

Phys. Rev. C 7, 290 (1973) - Published 1 January, 1973

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The level structure of ${}^{145}{Sm}$ was studied by observing the electron-capture decay of 5.9-day ${}^{145}{Eu}$ . The radioactive source was prepared by bombarding ${}^{144}{Sm}$ with protons accelerated in the Oak Ridge isochronous cyclotron. Both singles and $γ - γ$ coincidence spectra were measured. From these measurements, transition energies were obtained to an accuracy better than previously available and the following new transitions were assigned to the decay of ${}^{145}{Eu}$ : 519.4, 526.2, 713.9, 910.3, 949.9, ∼1625, 2340.8, 2508.1, and 2513.0 keV. Because of decay-energy considerations the latter three transitions establish the existence of new ${}^{145}{Sm}$ levels at 2340.8, 2508.1, and 2513.0 keV. From the coincidence data, levels at 1607.6 ( $½^{-}$ ) and 1843.6 (½, ${\frac{3}{2}}^{-}$ ) keV were also established; these states apparently correspond to those previously observed in ${}^{144}{Sm} (d, p)$ studies at about 1611 and 1854 keV. A survey of available data for $N = 83$ isotones ( ${}^{137}{Xe}$ → ${}^{147}{Gd}$ ) indicated a systematic shift in excitation energy for seven rather well-established single-neutron states as their location was traced from nuclide to nuclide. On this basis it was then possible to predict in ${}^{137}{Xe}$ , ${}^{141}{Ce}$ , and ${}^{147}{Gd}$ the approximate excitation energies of some of these so far unreported states.

Hartree-Fock Calculations with Skyrme's Interaction. II. Axially Deformed Nuclei

D. Vautherin

Phys. Rev. C 7, 296 (1973) - Published 1 January, 1973

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Skyrme's interaction is used in deformed Hartree-Fock calculations of some light and rare-earth nuclei. A method of solution is presented, which exploits as much as possible the simple features of the Skyrme force in order to allow calculations of heavy deformed nuclei. In the rare-earth region pairing correlations are taken into account in a simplified but self-consistent way by considering energy functionals depending also on occupation probabilities. Calculations have been made for the two parameter sets which were used in a previous study of double-closed-shell nuclei. The set providing the best fit to ground-state properties of spherical nuclei is also found to give a satisfactory description of nuclear deformations. Comparison is made with other available Hartree-Fock calculations in the case of light nuclei, and a discussion of the importance of various terms in the effective force upon nuclear deformations is given.

Entrance Channel Phenomena in Complex Nuclear Scattering

A. Gobbi, R. Wieland, L. Chua, D. Shapira, and D. A. Bromley

Phys. Rev. C 7, 30 (1973) - Published 1 January, 1973

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The elastic scattering excitation functions of the systems ${}^{6}{Li}$ - ${}^{6}{Li}$ , ${}^{12}C$ - ${}^{12}C$ , ${}^{14}N$ - ${}^{14}N$ , ${}^{16}O$ - ${}^{14}N$ , ${}^{16}O$ - ${}^{15}N$ , ${}^{16}O$ - ${}^{16}O$ , ${}^{16}O$ - ${}^{18}O$ , and ${}^{18}O$ - ${}^{18}O$ have been subjected to comparative optical-model analyses. The gross structure characteristic of all these excitation functions is shown to arise from potential scattering phenomena. These phenomena have been studied in detail. The extracted ${}^{16}O$ - ${}^{16}O$ potential has been used as input to detailed studies leading to the identification of single partial-wave orbiting resonances of 3- to 4-MeV width. The ${}^{16}O$ - ${}^{16}O$ experimental data have also been used to test for the possible existence of a variable-moment-of-inertia effect during the interpenetrating collisions; no evidence for such an effect has been found, at least in this particular case. New suggestions for the prediction of the imaginary optical-potential parameters have been investigated.

Inelastic Proton Scattering Angular Distributions

J. H. Degnan, B. L. Cohen, G. R. Rao, K. C. Chan, and L. Shabason

Phys. Rev. C 7, 316 (1973) - Published 1 January, 1973

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A new technique for determining inelastic angular distributions, which greatly alleviates the background problem, is described. Application of the technique to ( $p, p^{'}$ ) reactions with targets ${}^{122}{Sn}$ , ${}^{119}{Sn}$ , and ${}^{112}{Sn}$ is discussed and the results are compared with results using a more conventional technique. The results are that the differential cross section is forward peaked at all energies for ( $p, p^{'}$ ) reactions with targets ${}^{119}{Sn}$ and ${}^{122}{Sn}$ , while it is approximately isotropic with the target ${}^{112}{Sn}$ at higher excitation energies of the residual nucleus. The ${}^{112}{Sn}$ result is expected from the previously established predominance of ordinary compound-nucleus processes in that reaction. For ${}^{119}{Sn}$ and ${}^{122}{Sn}$ in which it was previously presumed that isospin-conserving reactions via $T_{>}$ states dominate the low-energy portion of the proton spectrum, the results indicate a sizable contribution of direct reactions or of pre-equilibrium reactions with very few collisions.

Two-Photon Decay of the 1.76-MeV $0^{+}$ State of ${}^{90}{Zr}$

Yasuyuki Nakayama

Phys. Rev. C 7, 322 (1973) - Published 1 January, 1973

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Measurements of the probability and the energy distribution for the two-photon decay from the 1.76-MeV $0^{+}$ first excited state to the $0^{+}$ ground state of ${}^{90}{Zr}$ have been performed using a sum-coincidence technique with an antidetector and large lead shields. This improved experimental technique made it possible to eliminate unfavorable coincident events which would disturb true events from the two-photon process. The ratio of two-photon decay to the sum of internal-pair decay and internal-conversion decay, $\frac{T_{γ γ}}{T_{π + e}}$ , has been found to be (5.1 ± 2.5) × $10^{- 4}$ . This value is larger than the upper limits reported recently by other workers, and not consistent with any values calculated based on existing theories. The energy spectrum of one of two photons has also been observed. This spectrum suggests reasonably that two-photon decay takes place as an ( $E 1, E 1$ ) transition via giant-dipole-resonance states. A discussion of the theoretical significance of this study is given.

Reaction Mechanisms in ( $p, p^{'}$ ) Reactions Exciting the High-Energy Continuum

B. L. Cohen, G. R. Rao, J. H. Degnan, and K. C. Chan

Phys. Rev. C 7, 331 (1973) - Published 1 January, 1973

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The reaction mechanism in ( $p, p^{'}$ ) reactions exciting states above about 3-MeV excitation energy has been studied in several nuclei in which ordinary compound-nucleus contributions have been shown to be unimportant. Up to 7 MeV in ${}^{64}{Ni}$ and ${}^{124}{Sn}$ , there is strong structure in the energy spectra of emitted protons which is closely correlated with the structure in ( $d, d^{'}$ ) reactions; this indicates that direct reactions exciting collective states are the dominant mechanism here. Distorted-wave Born-approximation calculations are used to show that there is an additional mechanism contributing low-energy protons. This mechanism is believed to be isospin-conserving reactions via $T_{>}$ states, but it is shown that the decay of these states cannot be treated with statistical theory in the Sn region. A reason for this is proposed, and supporting evidence is presented. The applicability of pre-equilibrium calculations to ( $p, p^{'}$ ) reactions is discussed.

Odd-Even Effects in Pre-Equilibrium Processes

S. M. Grimes, J. D. Anderson, J. W. McClure, B. A. Pohl, and C. Wong

Phys. Rev. C 7, 343 (1973) - Published 1 January, 1973

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Neutron spectra produced by the ( $p, n$ ) reaction at 12 and 14 MeV on targets of ${}^{112}{Cd}$ , ${}^{113}{Cd}$ , ${}^{114}{Cd}$ , and ${}^{115}{In}$ are compared with the predictions of the exciton model for pre-equilibrium reactions. It is concluded that although the shape of the spectra for even- $A$ targets differs from that for odd- $A$ targets, the differences are not entirely consistent with the analysis of Lee and Griffin for ( $p, n$ ) reactions on the Sn isotopes. The possible explanations for deviations from model calculations include effects due to shells, pairing, and angular momentum.

Magnetic Moment of the 80-keV $1^{-}$ State of ${}^{144}\Pr$

B. K. Sinha and R. Bhattacharyya

Phys. Rev. C 7, 350 (1973) - Published 1 January, 1973

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The magnetic moment of the 80-keV $1^{-}$ state of ${}^{144}\Pr$ has been determined using the integral-reversed-field method of the perturbed angular correlations. The value of $μ = (- 4.3 \pm 1.4) μ_{N}$ indicates a structure of the 80-keV level based on the mixing between two shell-model states, both having the odd neutron in $f_{\frac{7}{2}}$ configuration — the odd proton occupying $g_{\frac{7}{2}}$ and $d_{\frac{5}{2}}$ configurations, respectively.

Angular Distribution of Alpha Particles in the Spontaneous Fission of ${}^{252}{Cf}$

M. J. Fluss, S. B. Kaufman, E. P. Steinberg, and B. D. Wilkins

Phys. Rev. C 7, 353 (1973) - Published 1 January, 1973

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The long-range $α$ particles released in the spontaneous fission of ${}^{252}{Cf}$ have been studied in a four-parameter experiment. The energy and angle of the $α$ particle were measured with a position-sensitive detector, and the energy and mass of one of the coincident fission fragments were determined from time-of-flight measurements. The most probable angle of all $α$ particles with respect to the light fission fragment was found to be 84.3°±0.7°, and the width of the distribution was 18.5°±1° full width at half maximum. Correlations of the $α$ -particle energy and angle with fission-fragment mass are discussed in terms of trajectory calculations and compared with previous data.

Levels of ${}^{138}{Cs}$ Fed in the $β$ -Decay of ${}^{138}{Xe}$

E. Achterberg, F. C. Iglesias, A. E. Jech, J. A. Moragues, D. Otero, M. L. Pérez, A. N. Proto, J. J. Rossi, W. Scheuer, and J. F. Suárez

Phys. Rev. C 7, 365 (1973) - Published 1 January, 1973

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The energy levels of ${}^{138}{Cs}$ populated in the decay of 14.2-min ${}^{138}{Xe}$ have been investigated using on-line techniques. The $γ$ -ray energies and intensities in the range 0.1-2.5 MeV were determined with Ge(Li) detectors. Using a Si(Li) x-ray detector, a 10.7-keV $γ$ ray was found and its $L$ -shell conversion coefficient determined to be 150 ± 70. Conversion-electron lines have been measured with a Si(Li) detector and the following $K$ conversion coefficients have been calculated (transition energies in keV, within brackets): (290 ± 30) × $10^{- 3}$ [154.0], (62 ± 14) × $10^{- 3}$ [242.8], (56 ± 5) × $10^{- 3}$ [258.5], (16 ± 3) × $10^{- 3}$ [396.7], (37 ± 8) × $10^{- 3}$ [401.5], and (15 ± 2) × $10^{- 3}$ [434.6]. Ge(Li)-Ge(Li) and Si(Li)-Ge(Li) $γ - γ$ coincidences have been measured. From these experiments the following level sequence is proposed (energies in keV, $J^{π}$ within brackets): 0 [ $3^{(-)}$ ]; 10.79 ± 0.11 [ $2^{(-)}$ ]; 15.71 ± 0.12 [ $1^{(-)}$ , $0^{(-)}$ , $2^{(-)}$ ]; 258.49 ± 0.11 [ $2^{(-)}$ , $1^{(-)}$ ]; 412.45 ± 0.16 [ $1^{(-)}$ ]; 450.33 ± 0.16 [ $0^{(-)}$ , $1^{(-)}$ ]; 541.05 ± 0.13; 815.7 ± 0.4; 876.21 ± 0.22; 912.62 ± 0.14 [ $1^{(-)}$ , $2^{(-)}$ ]; 951.6 ± 0.4; 1109.67 ± 0.17; 1127.0 ± 0.3 [ $0^{\pm}$ , $1^{\pm}$ , $2^{-}$ ]; 1367.5 ± 0.3; 1395.8 ± 0.4; 1489.0 ± 0.4; 2026.67 ± 0.17 [ $1^{+}$ ]; 2263.01 ± 0.23 [ $1^{+}$ ]; 2337.62 ± 0.19 [ $1^{+}$ ]; 2468.5 ± 0.5 [0, 1]; and 2509.00 ± 0.24 [ $1^{+}$ ].

Detailed Study of Alpha Emission in ${}^{252}{Cf}$ Fission

G. K. Mehta, J. Poitou, M. Ribrag, and C. Signarbieux

Phys. Rev. C 7, 373 (1973) - Published 1 January, 1973

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Long-range $α$ -accompanied fission of ${}^{252}{Cf}$ is investigated in a five-parameter correlation experiment and the behavior of each component of total energy, including the prompt neutrons from the individual fragments, as well as from the fragment pairs and the prompt- $γ$ emission, is studied and compared with the binary fission. The problem of determining the nucleon contribution by binary fragments to the $α$ -particle formation is discussed. The average energy of the $α$ particle is observed to increase towards the symmetric fission region, which is understood in terms of a possible shift of the scission point towards the heavy fragment. The dependence of the average number of total neutrons on the $α$ -particle energy and the dependence of the $α$ -particle energy on the fragment total kinetic energy is not linear, which is interpreted to yield some qualitative information on the initial energy of the $α$ particle. Several differential correlations are also discussed.

Inelastic Proton Scattering from ${}^{96}{Mo}$ Through Isobaric Analog Resonances

J. J. Kent, W. R. Coker, and C. Fred Moore

Phys. Rev. C 7, 388 (1973) - Published 1 January, 1973

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Excitation functions for proton elastic and inelastic scattering to several low-lying states of ${}^{96}{Mo}$ have been measured in the energy range from 5.2 to 8.0 MeV. Isobaric analog resonances have been used to deduce the structure of parent states in ${}^{97}{Mo}$ . In particular, the ground state of ${}^{97}{Mo}$ was found to have parentage in four excited states of ${}^{96}{Mo}$ , besides the ${}^{96}{Mo}$ ground-state component already known from ${}^{96}{Mo} (d, p)$ studies. Angular distributions were measured on the prominent resonances to determine the angular momenta of the exiting protons and to obtain inelastic partial widths. Noticeable asymmetries in the inelastic yield curves are found and interpreted as arising from interference between the resonance reaction and other (direct) processes. The assignment of spin-parity $0^{+}$ to the 1.15-MeV state of ${}^{96}{Mo}$ is found to be consistent with the present data.

Directional Correlation of the Gamma Transitions in ${}^{140}{Ce}$

R. N. Saxena and H. D. Sharma

Phys. Rev. C 7, 395 (1973) - Published 1 January, 1973

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The directional correlations of coincident $γ$ transitions in ${}^{140}{Ce}$ have been investigated using a Ge(Li)-NaI(T1) spectrometer. $γ γ$ coincidences of the cascades 329-1597, 432-487, 329-487, 432-1597, 487-1597, 751-1597, 815-1597, 867-1597, 919-1597, and 925-1597 have been accumulated at 14 different angular positions by using an on-line IBM 360-44 computer. The multipole mixing ratios $δ$ obtained from the correlations are $δ (328) = - 0.4 \pm 0.02$ , $δ (432) = - 0.8 \pm 0.1$ , $δ (487) = 0.0 \pm 0.01$ , $δ (751) = 0.30 \pm_{0.02}^{0.07}$ , $δ (815) = - 0.04 \pm 0.01$ , $δ (867) = 0.25 \pm 0.02$ , $δ (919) = 0.06 \pm 0.09$ , and $δ (925) = - 0.15 \pm 0.07$ . The predicted electron-conversion coefficients are compared with the experimentally measured values and the spins and parities of the levels have been assigned. The spins and parities of levels at 2464 and 2516 keV appear to be $3^{-}$ and $4^{+}$ . The former level is not predicted from the model of Wildenthal.

Structure of ${}^{91}{Mo}$ via the ( $p, d$ ) and ( $d, t$ ) Reactions

R. L. Kozub and D. H. Youngblood

Phys. Rev. C 7, 404 (1973) - Published 1 January, 1973

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The ( $p, d$ ) and ( $d, t$ ) reactions on ${}^{92}{Mo}$ have been studied at bombarding energies of 38.6 and 40.6 MeV, respectively. The ( $p, d$ ) reaction $Q$ value was measured to be -10.446 ± 0.015 MeV. Excitation energies and angular distributions were measured for levels up to 3.5 MeV excitation. The distorted-wave Born-approximation spectroscopic factors indicate that essentially all of the $1 g_{\frac{9}{2}}$ and $2 p_{\frac{1}{2}}$ strength and 60-65% of the $2 p_{\frac{3}{2}}$ and $1 f_{\frac{5}{2}}$ strength were observed. The results are generally in good agreement with the unified-model calculations of Kitching.

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High-Energy States in ${}^{49}V$ and the Decay of ${}^{49}{Cr}$

Study of Level Structure of ${}^{78}{Kr}$

Neutron-Nucleus Total and Inelastic Cross Sections: 900 to 2600 $\frac{MeV}{c}$

Parity Mixing and the Nuclear Structure of ${}^{183, 184}W$ and Nuclear Spin-Lattice Relaxation Following the Decays of Oriented ${}^{183, 184 g, 184 m}{Re}$

Kinetic Energy Distributions in the Spontaneous Fission of ${}^{250}{Cm}$ and ${}^{250}{Cf}$

Studies of Mendelevium Isotopes with Mass Numbers 248 Through 252

Decay of 5.9-Day ${}^{145}{Eu}$ to Levels in ${}^{145}{Sm}$

Hartree-Fock Calculations with Skyrme's Interaction. II. Axially Deformed Nuclei

Entrance Channel Phenomena in Complex Nuclear Scattering

Inelastic Proton Scattering Angular Distributions

Two-Photon Decay of the 1.76-MeV $0^{+}$ State of ${}^{90}{Zr}$

Reaction Mechanisms in ( $p, p^{'}$ ) Reactions Exciting the High-Energy Continuum

Odd-Even Effects in Pre-Equilibrium Processes

Magnetic Moment of the 80-keV $1^{-}$ State of ${}^{144}\Pr$

Angular Distribution of Alpha Particles in the Spontaneous Fission of ${}^{252}{Cf}$

Levels of ${}^{138}{Cs}$ Fed in the $β$ -Decay of ${}^{138}{Xe}$

Detailed Study of Alpha Emission in ${}^{252}{Cf}$ Fission

Inelastic Proton Scattering from ${}^{96}{Mo}$ Through Isobaric Analog Resonances

Directional Correlation of the Gamma Transitions in ${}^{140}{Ce}$

Structure of ${}^{91}{Mo}$ via the ( $p, d$ ) and ( $d, t$ ) Reactions

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