Effective mass in nuclei and the level density parameter

Prakash, M.; Wambach, J.; Ma, Z.Y.

doi:10.1016/0370-2693(83)90377-5

Effective mass in nuclei and the level density parameter

1983

6 pages

Published in:

Phys.Lett.B 128 (1983) 141-146

Published: 1983

DOI:

10.1016/0370-2693(83)90377-5

View in:

Nuclear Science References

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Abstract: (Elsevier)

The influence of momentum and frequency dependence of the nuclear mean field Σ on the level density parameter a is studied. By introducing a local quasiparticle effective mass we determine the volume, surface and curvature coefficients of a , expressed as a = a V A + a S A 2 3 + a c A 1 3 . It is found that the magnitude of a c is significant due to the very nature of the surface. A purely momentum dependent field Σ determined from the nonlocality of the optical potential gives a level density close to a self-consistent Thomas-Fermi description with Skyrme III forces. An explicit frequency dependence of Σ mainly influences a s , enhancing it considerably for medium and heavy nuclei.

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