Observation of isomeric decays in the r-process waiting-point nucleus 130Cd82.
The gamma decay of excited states in the waiting-point nucleus (130)Cd(82) has been observed for the first time. An 8(+) two-quasiparticle isomer has been populated both in the fragmentation of a (136)Xe beam as well as in projectile fission of 238U, making (130)Cd the most neutron-rich N = 82 isotone for which information about excited states is available. The results, interpreted using state-of-the-art nuclear shell-model calculations, show no evidence of an N = 82 shell quenching at Z = 48. They allow us to follow nuclear isomerism throughout a full major neutron shell from (98)Cd(50) to (130)Cd(82) and reveal, in comparison with (76)Ni(48) one major proton shell below, an apparently abnormal scaling of nuclear two-body interactions.
Jungclaus
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A
Departamento de Física Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain.
Cáceres
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Górska
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Pfützner
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Pietri
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Werner-Malento
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Grawe
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Langanke
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Martínez-Pinedo
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Nowacki
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Poves
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Cuenca-García
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Rudolph
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Podolyak
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Regan
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Detistov
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Lalkovski
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Modamio
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Walker
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Bednarczyk
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Doornenbal
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Geissel
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Gerl
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Grebosz
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Kojouharov
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Kurz
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Prokopowicz
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Schaffner
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Wollersheim
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Andgren
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Benlliure
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Benzoni
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Bruce
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Casarejos
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Cederwall
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Crespi
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Hadinia
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Hellström
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Hoischen
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Ilie
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Jolie
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Khaplanov
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Kmiecik
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Kumar
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Maj
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Mandal
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Montes
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Myalski
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Simpson
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Steer
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Tashenov
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Wieland
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