Abstract
Highly excited states in30Si were investigated using the27Al(α, p γ) reaction. Proton-γ ray angular correlations were measured atE α=12, 14.1 and 15MeV. At 15MeV linear polarizations ofγ-rays were measured in coincidence with protons using a five-crystal Compton-polarimeter. Lifetimes were measured atE α=14.6 MeV using the Dopper-shift attenuation method. Unambigious spin-parity assignments were obtained for the levels at 6,865 (3+), 7,001 (5+), 7,079 (3+), 7,810 (4), 9,371 (6+), 7,613 (4−), 8,196 (5−), 8,596 (4−), 8,963 (5−), 9,111 (6−), 9,350 (4−), 9,507 (5−), 9,777 (6−), 10,188 (5−), 10,305 (3−), 10,561 (6−), 10,725 (7−), 11,477 (6−) and 11,544 (7−)keV excitation energy, respectively. The structure of30Si is understood both in terms of the shell model and the collective model. The levels at 5,487, 6,505, 8,196, 9,777 and 11,544keV, respectively, are theI π=3− through 7− members of a well developedK π=3− rotational band with intrinsic quadrupole moment |Q 0|=350 +250−70 mb. There is evidence of further rotational bands, among them aK π=3− band with |Q 0|=800 +422−80 mb.
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Work supported by Deutsche Forschungsgemeinschaft
The authors are indebted Miss G. Born for target preparation, Miss S. Geugelin for typing the lengthy manuscript and to the staff of the accelerator.
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Bitterwolf, E., Betz, P., Burkard, A. et al. Structure of30Si from the spectroscopy of highly excited states. Z Physik A 298, 279–292 (1980). https://doi.org/10.1007/BF01425158
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DOI: https://doi.org/10.1007/BF01425158