Determination of critical angular momenta and spectroscopy of high-spin states by heavy-ion compound reactions - INSPIRE

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Determination of critical angular momenta and spectroscopy of high-spin states by heavy-ion compound reactions

1976

32 pages

Published in:

Nucl.Phys.A 262 (1976) 157-188

Published: 1976

DOI:

10.1016/0375-9474(76)90446-2

View in:

Nuclear Science References

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Abstract: (Elsevier)

A method is presented that allows the determination of critical angular momenta J crit in light nuclei ( A ⪅ 40) with high accuracy. The method is based on a statistical model analysis of ratios of cross sections for discrete states of known spin, which are excited in a high-spin selective decay channel of the compound nucleus. Extensive tests regarding the influence of level density and optical model parameters on the calculations show that the determination of J crit can be performed independently of the choice of these parameters. In addition, it is shown that after J crit has been determined, level density parameters a (averaged over shell effects) can be extracted very accurately from absolute cross sections. Furthermore, it turns out that high-spin selective heavy-ion compound reactions are a powerful means for spectroscopy of high-spin states. As a first application, these procedures are applied to the reaction 10 B( 12 C, d) measured at E lab = 45 MeV (corresponding to E ∗ = 37.7 MeV excitation energy in 22 Na). The value J crit = 14 ± 1 obtained is discussed in the frame of the existing models. Spin assignments have been suggested for hitherto unknown high-spin states in 20 Ne, ranging up to 17.4 MeV in excitation energy. As a result, the hypothesis of the existence of superbands in 20 Ne is shown to be wrong.

Nuclear reaction

References(58)

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