1986
DOI: 10.1007/bf01290761
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Decay properties of very-high-spin states in transitional Er nuclei aroundA=154

Abstract: The 7 ray continuum structures of the transitional Er isotopes with A ~ 154 are studied using the reaction 74Ge(8r xn) lS8-XEr at El, b = 340 MeV. The measurements include energy spectra, total energies, multiplicities, angular distributions and lifetimes using the DSAM method. The analysis of data confirms the previously observed two-bump structure of the continuum radiation. A meticulous subtraction of discrete contributions proves the persistence of the low-energy bump even at high spins, i.e. I>40 h. The a… Show more

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“…However, the spectral shape and the extent of the quasicontinuum contribution were not known since discrete lines, which are largely responsible for structure in the total y spectra below 1 MeV, were not subtracted. For example, double bumps were observed in the total spectra of 154l55 Er, but the lower bump is drastically reduced after subtraction 13 of discrete lines, and the residuum has almost no E2 contribution, 13 when the average input spin decreases from 50h at a beam energy of 165 MeV to 36h at 148 MeV. These observations demonstrate that the transitions associated with the upper peak precede the ones giving rise to the lower peak.…”
mentioning
confidence: 88%
“…However, the spectral shape and the extent of the quasicontinuum contribution were not known since discrete lines, which are largely responsible for structure in the total y spectra below 1 MeV, were not subtracted. For example, double bumps were observed in the total spectra of 154l55 Er, but the lower bump is drastically reduced after subtraction 13 of discrete lines, and the residuum has almost no E2 contribution, 13 when the average input spin decreases from 50h at a beam energy of 165 MeV to 36h at 148 MeV. These observations demonstrate that the transitions associated with the upper peak precede the ones giving rise to the lower peak.…”
mentioning
confidence: 88%