[en] In recent years there has been extensive study of nuclear shape parameters by electron scattering, μ meson atomic transitions, Coulomb excitation and direct nuclear inelastic scattering. Inelastic scattering of strongly absorbed particles, e.g., alpha-particles and heavy ions, at energies below and above the Coulomb barrier probe the charge and mass distributions within the nucleus. This paper summarizes measurements in this field performed at Oak Ridge National Laboratory

[en] Some physical implications of a recently proposed classification scheme for the ¹²C + ¹²C Coulomb barrier resonances for which the requisite very large body of experimental data is already available are discussed. New data are presented suggesting that the back angle resonance-like structure previously observed in quasi-elastic ²⁸Si + ¹²C reactions reflects the existence of a fully developed, rotating di-nuclear system that governs back-angle yields in many additional exit channels. Also some very recent data are briefly discussed for ⁶⁰Ni + ⁶⁰Ni scattering in a first look at a previously unstudied region of the periodic table

[en] The rise time and charge division techniques for position decoding with RC-line proportional counters are reviewed. The advantages that these detectors offer as focal plane counters for nuclear spectroscopy performed with magnetic spectrographs are discussed. The theory of operation of proportional counters as position sensing devices is summarized, as well as practical aspects affecting their application. Factors limiting the position and energy resolutions obtainable with a focal plane proportional counter are evaluated and measured position and energy loss values are presented for comparison. Detector systems capable of the multiparameter measurements required for particle identification, background suppression and ray-tracing are described in order to illustrate the wide applicability of proportional counters within complex focal plane systems. Examples of the use of these counters other than with magnetic spectrographs are given in order to demonstrate their usefulness in not only nuclear physics but also in fields such as solid state physics, biology, and medicine. The influence of the new focal plane detector systems on future magnetic spectrograph designs is discussed. (Auth.)

[en] Absolute cross sections for reaction products in the 38.5 to 51.0 MeV ¹⁶O bombardment of ⁶⁵Cu are reported. Gamma spectroscopy was used to identify the products. Results are compared with predictions for the statistical decay from compound nuclei. (3 figures) (U.S.)

[en] Evidence is presented for the formation of a long-lived rotating dinuclear complex in the early stages of the collision between light heavy nuclei. A study of the variation of the total kinetic energy of the outgoing fragments with bombarding energy allows a determination of the average dinuclear separation prior to scission. At higher bombarding energies the study reveals that the system of the two colliding nuclei has reached a critical value of angular momentum beyond which it can not be trapped into an orbiting configuration

[en] Angular distributions are shown for the ratio of elastic to Rutherford scattering and for excitation of the ²⁰Ne 2⁺ state at 1.63 MeV from 20⁰ to 80⁰ (c.m.). Coupled-channels calculations represent the data much better than the optical model does. 2 figures, 1 table

[en] Data for the ¹⁴⁴Sm(¹³C,¹²C)¹⁴⁵Sm and ¹⁴⁴Sm(¹³C,¹⁴C)¹⁴³Sm reactions were taken at incident energies of 66 and 72 MeV respectively. In addition, elastic scattering of ¹³C from ¹⁴⁴Sm at 66 MeV was performed to obtain optical model parameters for cross section calculations. Experimental cross sections along with DWBA predictions for ¹⁴⁴Sm(¹³C,¹⁴C) and spectroscopic factors for ¹⁴³Sm are given. Results for the ¹⁴⁴Sm(¹³C,¹²C) reaction are not as clear. (2 figures, 1 table) (U.S.)

No abstract available

[en] The need for a new generation magnetic spectrograph for the Holifield Heavy Ion Research Facility is discussed. The advantages of a magnetic spectrograph for heavy ion research are discussed, as well as some of the types of experiments for which such an instrument is suited. The limitations which the quality of the incident beam, target and spectrograph itself impose on high resolution heavy ion measurements are discussed. Desired features of an ideal new spectrograph are: (1) intrinsic resolving power E/ΔE greater than or equal to 3000; (2) maximum solid angle greater than or equal to 20 msr; (3) dispersion approx. 4-8m; (4) maximum energy interval approx. 30%; and (5) mass-energy product greater than or equal to 200. Various existing and proposed spectrographs are compared with the specifications for a new heavy ion magnet design

[en] High spin states in ²⁴Mg populated by the ¹⁰B(¹⁶O,d) and ¹²C(¹⁶O,α) reactions have been investigated, and the data have been used to check the suitability of the Hauser-Feshbach (H-F) technique for determining spin values. It is concluded that the H-F method, coupled with additional information, may be a significant means for locating high spin states. (4 figures) (U.S.)