A reduced width connecting two nuclear levels contains information about the structure of the states involved. Techniques are described whereby such information can be cast into useable form: the formalism so developed is then applied to an analysis of stripping widths. The various kinds of information about the structure of nuclei which can be obtained from an analysis of stripping widths are reviewed and what is known about the single-particle reduced widths is collected and summarized. A number of experiments of particuiar interest for future study are discussed. (W.D.M.)

Stripping Reactions and the Structure of Light and Intermediate Nuclei

Coexistence in even-mass nuclei

Energy Levels of Light Nuclei. V

The description of many-body systems at low energy in terms of “elementary modes of excitation” (see, e.g., Noz 65) is very useful in the case of nuclei (see BM 69). “Elementary modes of excitation” as used here comprise collective (rotations and vibrations) as well as quasiparticle excitations. In order to study the various modes, experiments are required which selectively excite one such degree of freedom while all the others remain inactive spectators.

Two-Neutron Transfer Reactions and the Pairing Model

https://deepblue.lib.umich.edu/bitstream/handle/2027.42/32780/0000153.pdf?sequence=1

The weak coupling model applied to the nuclei with A = 16–19: (I). Energy levels

(p, t) Reactions on the even tin isotopes

The structure of ${\mathrm{O}}^{16}$ has been studied by means of the ${\mathrm{N}}^{15}({\mathrm{He}}^{3},d){\mathrm{O}}^{16}$ reaction. The experiments were performed with 16.00- and 24.90-MeV ${\mathrm{He}}^{3}$ beams from the tandem Van de Graaff accelerator at Rochester. Reaction products were analyzed and recorded automatically by means of a high-resolution magnetic spectrometer equipped with a sonic-spark counter connected to an on-line computer system. In the region of excitation up to about 22 MeV, 14 lines have been identified with levels of ${\mathrm{O}}^{16}$, all having odd parity except the ground state (which was strongly excited), the first excited state (which was weakly excited), and the third excited state (which was barely detectable). Many well-known states were not seen. The experimental data have been analyzed by use of distorted-wave Born-approximation (stripping theory) calculations, and the results have been compared with expectations from wave functions of the shell model and of the "mixed model" exemplified in the work of Brown and Green and of Kelson. The strengths of the transitions are mostly found to be in good agreement with predictions of the mixed model and, where applicable, the shell model, although the $J={2}^{\ensuremath{-}}$, $T=0$ state at 12.53 MeV seems somewhat too strongly excited. However, a strongly excited state tentatively identified as a ${J}^{\ensuremath{\pi}}={3}^{\ensuremath{-}}$, $T=0$ state of ${\mathrm{O}}^{16}$ lying at 13.12 MeV is not predicted by any of the theories used in the comparisons.

N 15 ( He 3 , d ) O 16 Reaction and Structure of Oxygen-16

Cross sections and angular distributions are given for the ($d, p$), ($d, \ensuremath{\alpha}$), and ($d, d$) reactions on ${\mathrm{O}}^{16}$ in the deuteron energy range 3.4 to 4.2 Mev.

Reactions O 16 (d, p), (d, α), and (d, d) in the Energy Range 3.4 to 4.2 Mev

The angular distributions and absolute cross sections for the reactions ${\mathrm{Be}}^{9}(d,p){\mathrm{Be}}^{10}$, ${\mathrm{Be}}^{9}(d,p){\mathrm{Be}}^{10*}$ (3.37 Mev), and ${\mathrm{Be}}^{9}(d,t){\mathrm{Be}}^{8}$ have been determined with 3.6-Mev deuterons. Both proton distributions have shapes characteristic of ${l}_{n}=1$ in the Butler theory. The peak cross sections found for these reactions are 3.1\ifmmode\pm\else\textpm\fi{}0.6 and 4.5\ifmmode\pm\else\textpm\fi{}0.9 mb/steradian, respectively. The triton distribution is peaked at 0\ifmmode^\circ\else\textdegree\fi{}. Its cross section at 5\ifmmode^\circ\else\textdegree\fi{} is 15.5\ifmmode\pm\else\textpm\fi{}3 mb/steradian.

Angular Distributions of Protons and Tritons from Deuteron-Induced Reactions on Be 9

A Teflon (C${\mathrm{F}}_{2}$) target was bombarded with 3.6-Mev deuterons from the Rochester 26-inch cyclotron, and the angular distributions of the resulting proton groups were determined using an ionization chamber detector. The following table gives the angular momentum transfer (determined by comparison with the Butler curves) and the cross sections corresponding to the indicated levels in ${\mathrm{F}}^{20}$: These ${\mathrm{F}}^{20}$ states were found to have even parity, and the ground-state spin was determined to be 1.

H. W. Fulbright

Papers

(p, t) Reactions on the even tin isotopes

N 15 ( He 3 , d ) O 16 Reaction and Structure of Oxygen-16

Reactions O 16 (d, p), (d, α), and (d, d) in the Energy Range 3.4 to 4.2 Mev

Angular Distributions of Protons and Tritons from Deuteron-Induced Reactions on Be 9

Angular Distributions of Protons from the Reaction F 19 (d, p)F 20