Elsevier

Nuclear Physics A

Volume 235, Issue 1, 9 December 1974, Pages 154-170
Nuclear Physics A

Coulomb excitation of the even-mass selenium nuclei

https://doi.org/10.1016/0375-9474(74)90183-3Get rights and content

Abstract

The properties of the low-lying states of the doubly even selenium nuclei have been investigated via multiple Coulomb excitation effected with 39.2 MeV oxygen projectiles. The excitation probabilities of the first 2+ states of 76Se, 78Se and 80Se have been determined directly by resolving inelastically and elastically scattered 4He projectiles on thin targets. These measurements yielded values of B(E2; 0+ → 2+) equal to 0.421 ± 0.009 (76Se), 0.321 ± 0.009 (78Se) and 0.248 ± 0.005 (80Se) e2 · b2. The multiple Coulomb excitation experiments enabled us to detect 2+ and 4+ levels in all isotopes studied up to 2.1 MeV. Moreover the double Coulomb excitation of 0+' states at 854.1 keV (74Se), 1498.5 keV (78Se), and 1478.3 keV (80Se) was also observed. The enhancement of the E2 transition between these 0+' levels and the first 2+ states decreases rapidly with the increase of the neutron number, i.e., B(E2; 0+′ → 2+)/B(E2; 2+ → 0+) = 2.04 ± 0.08 (74Se), 0.91 ± 0.08 (78Se), and 0.28 ± 0.04 (80Se). States interpreted as the result of direct E3 Coulomb excitation have been observed at 2350.2, 2429.2, 2507.6, and 2717.6 keV in 74Se, 76Se, 78Se and 80Se, respectively. Their B(E3; 0+ → 3) values are 2.1 ± 0.5 (74Se), 4.0 ± 0.5 (76Se), 2.7±0.3 (78Se) and 0.9 ± 0.2 ( × 10−2 e2 · b3 which represent enhancements of 9.2 ± 2.2, 16.6 ± 2.1, 10.8 ± 1.2 and 3.2 ± 0.7 respectively. Furthermore, angular distribution measurements of γ-rays following Coulomb excitation with 42 MeV 16O ions in 78Se and 80Se have been performed. The E2 content of the 2+' → 2+ transition in these two nuclei is 87.9 % (78Se), and 96.2 % or 33.5 % (80Se).

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