The essential decay of pandemonium: A demonstration of errors in complex beta-decay schemes

Characterization of the low-lying0+and2+states inNi68Flavigny1, Pauwels2, Radulov3 et al. 2015Phys. Rev. C462420View full textAdd to dashboardCite

“…[11] and [30], were made for the 68 Co low-spin state only on the basis of the β-feeding pattern. Three arguments would in principle support the presence of a strong Pandemonium effect [31]: (i) the very high Q value of 11.54(15) MeV [32], (ii) the fact that levels with spins up to 5 − are observed in the decay of the low-spin isomer, (iii) the 42(10)% of missed feeding. New experimental data has emerged that shed doubt on the (3 + ) assignment originating from a π (f 7/2 ) −1 ν(p 1/2 ) +1 or π (f 7/2 ) −1 ν(f 5/2 ) +1 coupling, for the low-spin β-decaying states in 66 Co and 68 Co [11].…”

First experiment with the NUSTAR/FAIR Decay Total Absorption γ-Ray Spectrometer (DTAS) at the IGISOL IV facility

“…In contrast with high resolution spectroscopy, where HPGe detectors are used to detect individual γ rays, TAGS aims to detect the full β-delayed electromagnetic cascade, avoiding the systematic error known as the Pandemonium effect [4] related to the modest efficiency of the HPGe detectors, that shifts the apparent I β distribution to lower excitation energies. The main requirement for such a detector is to maximize the efficiency by using large scintillator crystals to cover a solid angle of ∼ 4π.…”

High-precisionγ-ray spectroscopy of the cardiac PET imaging isotopeRb82and its impact on dosimetry

“…The issue in question here is quantifying the additional contribution from all other excited states populated in the decay. With a Q value of over 4 MeV, the highly fragmented flux to very high-lying states, which frequently is missed in low-sensitivity, high resolution γ-ray spectroscopy [8], could significantly add to the γ-ray burden.…”