Statistical model and cross sections for the evaporation residues formed in the reaction 22Ne + 190Os at the 22Ne projectile bombarding energy of 6.0–10.0 MeV/nucleon
✍ Scribed by A.N Andreyev; D.D Bogdanov; V.I Chepigin; A.P Kabachenko; O.N Malyshev; Yu.Ts Oganessian; A.G Popeko; J Rohác; R.N Sagaidak; G.M Ter-Akopian; A.V Yeremin; Š Šáro; M Veselský
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 810 KB
- Volume
- 626
- Category
- Article
- ISSN
- 0375-9474
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✦ Synopsis
The production cross sections were measured for the xn, pxn, and axn de-excitation channels of the :~2Rn compound nuclei formed at excitation energies of 80-160 MeV in the reaction 22Ne+l~)Os. The maximum cross sections obtained for the xn (x = 8-12), pxn (x = 8-11) and crxn (x = 8-11 ) reaction channels were fitted satisfactorily with the computer code HIVAP using its standard parameter set except that the single scaling parameter C = 0.65 was implemented to adjust the values of the liquid-drop fission barriers predicted by the Cohen-Plasil-Swiatecki (CPS) model. Additionally, an analysis of a large set of data on the formation cross sections of neutron-deficient Z = 83-92 nuclei showed that the whole body of data obtained for the nuclear region notable for the large variations of both the fiquid-drop barrier and the shell effects, can be described well with practically the same parameter C = 0.55-0.68. One may take this observation as an indication that, though the CPS model overestimates the liquid-drop fission barriers, it reproduces well the relative behaviour of these barriers in the whole range of neutrondeficient Z = 83-92 nuclei.