[en] The experimental shell-model states for ²⁰Ne nuclei are well understood. The level structure consists of 0⁺, 2⁺, 4⁺, 0⁺ etc. states. Most of our theoretical understanding of the level structure of nuclei require fitting to data a two-body interaction derived from realistic forces and using these set of data as input into a standard shell-model code to calculate the energy eigenstates of the nuclei. The set of data obtained from realistic forces usually, will not give a good description of the energy eigenstates. Using a set of two-body correlation basis functions, we have generated a set of two-body matrix elements from the Reid interaction. The matrix elements have been used to calculate the level scheme for ²⁰Ne nuclei using the standard Glasgow shell-model code. most of the low lying level structure of ²⁰Ne have been reproduced and results compare reasonably with experimental data

[en] In this work, the predicted skin doses of patients undergoing routine medical examinations at the Federal Medical Centre, Makurdi were carried out. We have used the Edmond's formula, the modified Edmond's formula and the regression method. Measurements were also made using phantoms and Thermoluminescence Dosimeter (TLD) in place of patients in order to compare the results obtained. The predicted mean chest dose for 100 patients undergoing routine medical examinations at Federal Medical Centre Makurdi was 0.73 mGy using Edmond's formula. The predicted average dose using our modified formula was 0.72 mGy. That using the regression method was 647.9 mGy. We repeated the above measurements with TLD badges using phantoms in place of patients. Twenty-four measurements were carried out. The average skin dose using TLD badges was 1.14 mGy. From these results, it can be seen that, the average dose from the modified Edmond's formula and the regression method closely agree with those obtained from the Edmond's formulae. On the other hand the average dose obtained using phantoms was significantly higher than the previous results. This significant difference may be due to the age associated with the X-ray machine used.

[en] Effects of tensor correlations on the positive parity states of ²⁰Ne nucleus are examined. Two-body nuclear matrix elements are obtained by the lowest order constrained variational technique with and without tensor correlations. The matrix elements calculated are used as input into the NUSHELL shell model code to calculate the energy spectrum of ²⁰Ne nucleus with and without tensor correlations. We have found that the effects of tensor correlations is to open up the calculated energy spectrum and provide reasonable agreement with experiment, whereas the energy spectrum calculated without tensor correlations is compressed and provides significant disagreement with experimental data. This feature is consistent with our observations for nuclei in the range 18≤A≤40 The results presented here re-emphasize the strong evidence found in nuclear structure calculations that tensor correlations are very important in nuclei and their presence cannot be ignored.