Observation of isomeric decays in the r-process waiting-point nucleus 130Cd82.

نویسندگان

A Jungclaus

L Cáceres

M Górska

M Pfützner

S Pietri

E Werner-Malento

H Grawe

K Langanke

G Martínez-Pinedo

F Nowacki

A Poves

J J Cuenca-García

D Rudolph

Z Podolyak

P H Regan

P Detistov

S Lalkovski

V Modamio

J Walker

P Bednarczyk

P Doornenbal

H Geissel

J Gerl

J Grebosz

I Kojouharov

N Kurz

W Prokopowicz

H Schaffner

H J Wollersheim

K Andgren

J Benlliure

G Benzoni

A M Bruce

E Casarejos

B Cederwall

F C L Crespi

B Hadinia

M Hellström

R Hoischen

G Ilie

J Jolie

A Khaplanov

M Kmiecik

R Kumar

A Maj

S Mandal

F Montes

S Myalski

G S Simpson

S J Steer

S Tashenov

O Wieland

چکیده

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.

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