High-sensitivity study of levels in 30Al following β decay of 30Mg
Olaizola, B., Mach, H., Fraile, L. M., Benito, J., Borge, M. J. G., Boutami, R., . . . Yordanov, D. T. (2016). High-sensitivity study of levels in 30Al following β decay of 30Mg. Physical Review C, 94 (5), 054318. doi:10.1103/PhysRevC.94.054318
Published inPhysical Review C
Mach, H. |
Hoff, P. |
© the Authors, 2016. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License.
γ -ray and fast-timing spectroscopy were used to study levels in 30Al populated following the β− decay of 30Mg. Five new transitions and three new levels were located in 30Al. A search was made to identify the third 1+ state expected at an excitation energy of ∼2.5 MeV. Two new levels were found, at 3163.9 and 3362.5 keV, that are firm candidates for this state. Using the advanced time-delayed (ATD) βγγ (t) method we have measured the lifetime of the 243.8-keV state to be T1/2 = 15(4) ps, which implies that the 243.8-keV transition is mainly of M1 character. Its fast B(M1; 2+ → 3+) value of 0.10(3) W.u. is in very good agreement with the USD shell-model prediction of 0.090 W.u. The 1801.5-keV level is the only level observed in this study that could be a candidate for the second excited 2+ state.