Quadrupole collectivity in neutron-rich Fe and Cr isotopes

Intermediate-energy Coulomb excitation measurements are performed on the N ≥ 40 neutron-rich nuclei (66,68)Fe and (64)Cr. The reduced transition matrix elements providing a direct measure of the quadrupole collectivity B(E2;2(1)(+) → 0(1)(+)) are determined for the first time in (68)Fe(42) and (64)C...

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Published in:Physical review letters 2013-06, Vol.110 (24), p.242701-242701
Main Authors: Crawford, H L, Clark, R M, Fallon, P, Macchiavelli, A O, Baugher, T, Bazin, D, Beausang, C W, Berryman, J S, Bleuel, D L, Campbell, C M, Cromaz, M, de Angelis, G, Gade, A, Hughes, R O, Lee, I Y, Lenzi, S M, Nowacki, F, Paschalis, S, Petri, M, Poves, A, Ratkiewicz, A, Ross, T J, Sahin, E, Weisshaar, D, Wimmer, K, Winkler, R
Format: Article
Language:English
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Summary:Intermediate-energy Coulomb excitation measurements are performed on the N ≥ 40 neutron-rich nuclei (66,68)Fe and (64)Cr. The reduced transition matrix elements providing a direct measure of the quadrupole collectivity B(E2;2(1)(+) → 0(1)(+)) are determined for the first time in (68)Fe(42) and (64)Cr(40) and confirm a previous recoil distance method lifetime measurement in (66)Fe(40). The results are compared to state-of-the-art large-scale shell-model calculations within the full fpgd neutron orbital model space using the Lenzi-Nowacki-Poves-Sieja effective interaction and confirm the results of the calculations that show these nuclei are well deformed.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.110.242701