Statistical model analysis of the 12C(14N, α) reaction and coherence widths in 26Al

doi:10.1016/0375-9474(78)90073-8

Nuclear Physics A

Volume 296, Issue 2, 20 February 1978, Pages 278-288

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Abstract

The ¹²C(¹⁴N, α)²²Na reaction was studied at bombarding energies between 22 and 39.2 MeV (lab) and a lab angle of 7°. Average coherence widths of states in the compound nucleus ²⁶Al populated in the reaction were obtained from excitation functions of twenty states or unresolved multiplets measured for states in ²²Na. From these data and Hauser-Feshbach predictions, values were determined for the level density parameters and for the effective moment of inertia of ²⁶Al. The critical angular momentum for the reaction was determined by comparing ratios of cross sections for excited states of ²²Na with Hauser-Feshbach predictions.

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Cited by (13)

Extension of the orbiting-cluster concept to fp shell systems
1985, Nuclear Physics, Section A
The orbiting-cluster model (OCM) of resonances in heavy-ion reactions is reviewed in the light of recent experimental results. Model predictions given earlier are compared with known data on resonances; good agreement is found. Slight modifications are introduced in the model making possible its application to a wide ensemble of heavy-ion systems in the composite mass range A = 22 to 72. Predictions of resonant behaviour are given for a number of systems. Limitations of the model are discussed.
Search for resonances in 12C(9Be, α)17O
1981, Nuclear Physics, Section A
Excitation functions at 7° (lab) have been measured from E_c.m. = 5.1 to 11.4 MeV in approximately 114 keV steps for 15 groups of final states in ¹⁷O populated by the ¹²C(⁹Be, α) reaction. Statistical tests have been used to locate possible non-statistical structure in the excitation functions. Possible anomalies were found near E_c.m. = 6.3, 7.5, 8.9 and 9.7 MeV. Angular distributions were measured at E_c.m. = 9.20, 9.71 and 10.23 MeV for the three lowest excited states in ¹⁷O. The data have been compared with Hauser-Feshbach calculations in addition to the following reaction mechanisms: compound plus a single resonance, compound plus interfering resonances and compound plus direct reactions.
The 12C(13C, α)21Ne reaction: High-spin states, resonances and coherence widths
1979, Nuclear Physics, Section A
Excitation functions were measured for states of ²¹Ne populated by the $^{12} C (^{13} C, α)$ reaction over the bombarding energy range E_lab = 18.2–32.0 MeV (18.4–27.0 MeV) at θ_lab = 7°(25°) in in 200 keV steps, and average coherence widths of states and the moment of inertia of the compound nucleus ²⁵Mg were obtained from these excitation functions. A statistical analysis of these data was performed. Angular distributions for states in ²¹Ne to 10 MeV in excitation energy were measured at θ_lab = 7°, 18°, 28° and 43° at bombarding energies from 29.0 to 31.0 MeV in 400 keV steps. These data along with Hauser-Feshbach predictions allow us to suggest spins for some states as well as to suggest possible candidates for rotational bands in ²¹Ne.
Energy levels of A = 21-44 nuclei (VI)
1978, Nuclear Physics, Section A
The experimentally determined properties of the A = 21–44 nuclei are compiled and evaluated, special emphasis being given to nuclear structure.
Separate tables for each of the nuclides reviewed give all available information about the following properties in this order: - excitation energies (E_x),
1. •
  - γ-ray branching ratios,
2. •
  - γ-ray mixing ratios (δ),
3. •
  - lifetimes (τ_m) or widths (Λ),
4. •
  - spin and parity (J^π) and isospin (T) assignments, and
5. •
  - any other data, on single-particle transfer, resonance levels, etc.
The “best” (or adopted) values for E_x, τ_m or Λ, J^π and T are summarized in a master table.
The review of each A-chain concludes with - a discussion of isospin multiplets,
1. •
  - a few remarks about the experimental situation, and
2. •
  - a compilation of references to relevant theoretical papers.
Nonstatistical structures in12C(14N,4He)22Na reaction
1990, Il Nuovo Cimento A
Non-statistical structures in12C(15N,4He)23Na reaction
1988, Pramana

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^††: Work supported in part by the National Science Foundation.

^†: Travel supported in part by Oak Ridge Associated Universities.

^†††: Operated by Union Carbide Corporation for the US Energy Research and Development Administration.

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Nuclear Physics A

Abstract

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The <sup>12</sup>C(<sup>13</sup>C, α)<sup>21</sup>Ne reaction: High-spin states, resonances and coherence widths

Energy levels of A = 21-44 nuclei (VI)

Nonstatistical structures in<sup>12</sup>C(<sup>14</sup>N,<sup>4</sup>He)<sup>22</sup>Na reaction

Non-statistical structures in<sup>12</sup>C(<sup>15</sup>N,<sup>4</sup>He)<sup>23</sup>Na reaction