Title: Low-energy level schemes of 66,68Fe and inferred proton and neutron excitations across Z = 28 and N = 40
Authors: Liddick, S.N. ×
Abromeit, B.
Ayres, A.
Bey, A.
Bingham, C.R.
Brown, B.A.
Cartegni, L.
Crawford, H.L.
Darby, I.G.
Grzywacz, R.
Ilyushkin, S.
Hjorth-Jensen, M.
Larson, N.
Madurga, M.
Miller, D.
Padgett, S.
Paulauskas, S.V.
Rajabali, Mustafa
Rykaczewski, K.
Suchyta, S. #
Issue Date: Jan-2013
Publisher: Published for the American Physical Society by the American Institute of Physics
Series Title: Physical Review C, Nuclear Physics vol:87
Article number: 014325
Abstract: Background: The nuclei in the region around 68Ni display an apparent rapid development of collectivity as protons are removed from the f7/2 single-particle state along the N = 40 isotonic chain. Proton and neutron excitations across the Z = 28 and N = 40 gaps are observed in odd-A 27Co and 26Fe isotopes. Little spectroscopic information beyond the excited 2+ and 4+ is available in the even-even (66,68)26Fe nuclei to compare with shell model calculations. Purpose: Our goal is to determine the low-energy level schemes of 66,68Fe and compare the observed excitations with shell model calculations to identify states wherein a contribution from excitations across Z = 28 and N = 40 are present. Method: The low-energy states of 66,68Fe were populated through the beta decay of 66,68Mn produced at the National Superconducting Cyclotron Laboratory. Beta-delayed gamma-ray transitions were detected and correlated to the respective parent isotope to construct a low-energy level scheme. Results: The low-energy level schemes of 66,68Fe were constructed from observed gamma-ray coincidences and absolute gamma-ray intensities. Tentative spin and parity assignments were assigned based on comparisons with shell model calculations and systematics. The two lowest 0+ and 2+ states were characterized in terms of the number of protons and neutrons excited across the respective shell gaps. Conclusion: The removal of two protons from 68Ni to 66Fe results in an inversion of the normal configuration and the one characterized by significant excitation across the Z = 28 and N = 40 gaps. Approximately, one proton and two neutrons are excited across their respective single-particle gaps in the ground state of 66Fe
ISSN: 0556-2813
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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