| Автор | A R H Subber |
| Автор | S J Robinson |
| Автор | P Hungerford |
| Автор | W D Hamilton |
| Автор | P Van Isacker |
| Автор | K Kumar |
| Автор | P Park |
| Автор | K Schreckenbach |
| Автор | G Colvin |
| Дата выпуска | 1987-06-01 |
| dc.description | The possibility of shape coexistence within the selenium isotopes and the general features of their structures have been examined within the framework of the DDM, IBM-1 and IBM-2. New data on <sup>76</sup>Se and <sup>78</sup>Se were obtained from gamma -ray and IC electron transitions. Levels and transitions in <sup>76</sup>Se were studied following the beta decay of oriented <sup>76</sup>As which had been dissolved in iron and cooled to 10.4 mK. The measured anisotropies of gamma transitions provided the multipole mixing ratios of 18 transitions, and previously proposed substantial L=0 mixing in three first-forbidden beta transitions was confirmed. Gamma-ray directional correlations and the IC electron spectrum of transitions in <sup>78</sup>Se were measured following thermal neutron capture by <sup>77</sup>Se. The correlation experiments gave the spins of 18 levels and the multipole mixing ratios of the more intense gamma -ray transitions. The good resolution electron spectrum allowed E0 transitions to be identified and also allowed the evaluation of IC coefficients and of X(E0:E2) ratios for Delta I=0 transitions. The 2<sup>+</sup> levels at 1.778 MeV (<sup>76</sup>Se) and 1.996 MeV (<sup>78</sup>Se) appear to have the features characteristic of the lowest mixed-symmetry state in a vibrational-like nucleus. The level energies, B(E2) ratios, multipole mixing ratios and X values are compared with the results obtained from the DDM and IBM. The comparisons between theoretical and experimental data are extended to even-even selenium isotopes in the range A=72 to 82. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | The level structure of <sup>76</sup>Se and <sup>78</sup>Se and the systematics of selenium isotopes within the framework of the DDM |
| Тип | paper |
| DOI | 10.1088/0305-4616/13/6/011 |
| Print ISSN | 0305-4616 |
| Журнал | Journal of Physics G: Nuclear Physics |
| Том | 13 |
| Первая страница | 807 |
| Последняя страница | 837 |
| Аффилиация | A R H Subber; Sch. of Math. & Physical Sci., Sussex Univ., Brighton, UK |
| Аффилиация | S J Robinson; Sch. of Math. & Physical Sci., Sussex Univ., Brighton, UK |
| Аффилиация | P Hungerford; Sch. of Math. & Physical Sci., Sussex Univ., Brighton, UK |
| Аффилиация | W D Hamilton; Sch. of Math. & Physical Sci., Sussex Univ., Brighton, UK |
| Аффилиация | P Van Isacker; Sch. of Math. & Physical Sci., Sussex Univ., Brighton, UK |
| Аффилиация | K Kumar; Sch. of Math. & Physical Sci., Sussex Univ., Brighton, UK |
| Аффилиация | P Park; Sch. of Math. & Physical Sci., Sussex Univ., Brighton, UK |
| Аффилиация | K Schreckenbach; Sch. of Math. & Physical Sci., Sussex Univ., Brighton, UK |
| Аффилиация | G Colvin; Sch. of Math. & Physical Sci., Sussex Univ., Brighton, UK |
| Выпуск | 6 |
