Analogous intruder behavior near Ni, Sn, and Pb isotopes

Liddick, S. N.; Walters, W. B.; Chiara, C. J.; Janssens, R. V.  F.; Abromeit, B.; Ayres, A.; Bey, A.; Bingham, C. R.; Carpenter, M. P.; Cartegni, L.; Chen, J.; Crawford, H. L.; Darby, I. G.; Grzywacz, R.; Harker, J.; Hoffman, C. R.; Ilyushkin, S.; Kondev, F. G.; Larson, N.; Madurga, M.; Miller, D.; Padgett, S.; Paulauskas, S. V.; Rajabali, M. M.; Rykaczewski, K.; Seweryniak, D.; Suchyta, S.; Zhu, S.

doi:10.1103/PhysRevC.92.024319

Title: Analogous intruder behavior near Ni, Sn, and Pb isotopes

Journal Article · Sat Aug 01 00:00:00 EDT 2015 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.92.024319· OSTI ID:1391833

Liddick, S. N.; Walters, W. B.; Chiara, C. J.; Janssens, R. V. F.; Abromeit, B.; Ayres, A.; Bey, A.; Bingham, C. R.; Carpenter, M. P.; Cartegni, L.; Chen, J.; Crawford, H. L.; Darby, I. G.; Grzywacz, R.; Harker, J.; Hoffman, C. R.; Ilyushkin, S.; Kondev, F. G.; Larson, N.; Madurga, M. more »

Near shell closures, the presence of unexpected states at lowenergies provides a critical test of our understanding of the atomic nucleus. New measurements for the N = 42 isotones Co-69(27) and Cu-71(29), along with recent data and calculations in the Ni isotopes, establish a full set of complementary, deformed, intruder states astride the closed-shell Ni-28 isotopes. Nuclei with a one-proton hole or one-proton particle adjacent to Z = 28 were populated in beta-decay experiments and in multinucleon transfer reactions. A beta-decaying isomer, with a 750(250)-ms half-life, has been identified in Co-69(27)42. It likely has low spin and accompanies the previously established 7/2(-) state. Complementary data for the levels of isotonic Cu-71(29)42 support the presence of a deformed, Delta J = 1 band built on the proton intruder 7/2(-) level at 981 keV. These data, together with recent studies of lower-mass Co and Cu isotopes and extensive work near Ni-68, support the view that intruder states based on particle-hole excitations accompany all closed proton shells with Z >= 28.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1391833

Journal Information:: Physical Review. C, Nuclear Physics, Vol. 92, Issue 2; ISSN 0556-2813

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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