6533b857fe1ef96bd12b5267
RESEARCH PRODUCT
Competition between Allowed and First-Forbidden β Decay : The Case of Hg208→Tl208
R. J. CarrollZs. PodolyákT. BerryH. GraweT. AlexanderA. N. AndreyevS. AnsariM. J. G. BorgeM. BrunetJ. R. CreswellL. M. FraileC. FahlanderH. O. U. FynboE. R. GambaW. GelletlyR.-b. GerstM. GórskaA. GredleyP. T. GreenleesL. J. Harkness-brennanM. HuyseS. M. JudgeD. S. JudsonJ. KonkiJ. KurcewiczI. KutiS. LalkovskiI. H. LazarusR. LicăM. LundM. MadurgaN. MargineanR. MargineanI. MarroquinC. MihaiR. E. MihaiE. NácherA. NegretC. NitaS. PascuR. D. PageZ. PatelA. PereaJ. PhrompaoM. PiersaV. PucknellP. RahkilaE. RapisardaP. H. ReganF. RotaruM. RudigierC. M. ShandR. ShearmanS. StegemannT. StoraCh. SottyO. TengbladP. Van DuppenV. VediaR. WadsworthP. M. WalkerN. WarrF. WearingH. De Wittesubject
Nuclear TheoryNuclear Experimentydinfysiikkanuclear structure and decaysdescription
The β decay of 208Hg into the one-proton hole, one neutron-particle 20881Tl127 nucleus was investigated at CERN-ISOLDE. Shell-model calculations describe well the level scheme deduced, validating the proton-neutron interactions used, with implications for the whole of the N>126, Z<82 quadrant of neutron-rich nuclei. While both negative and positive parity states with spin 0 and 1 are expected within the Qβ window, only three negative parity states are populated directly in the β decay. The data provide a unique test of the competition between allowed Gamow-Teller and Fermi, and first-forbidden β decays, essential for the understanding of the nucleosynthesis of heavy nuclei in the rapid neutron capture process. Furthermore, the observation of the parity changing 0+→0−β decay where the daughter state is core excited is unique, and can provide information on mesonic corrections of effective operators. peerReviewed
year | journal | country | edition | language |
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2020-01-01 |