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Enhanced collectivity in 74Ni

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arxiv 1008.0477 v1 pith:T3LB4FFY submitted 2010-08-03 nucl-ex

N. Aoi , S. Kanno , S. Takeuchi , H. Suzuki , D. Bazin , M. D. Bowen , C. M. Campbell , J. M. Cook
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D.-C. Dinca A. Gade T. Glasmacher H. Iwasaki T. Kubo K. Kurita T. Motobayashi W. F. Mueller T. Nakamura H. Sakurai M. Takashina J. R. Terry K. Yoneda H. Zwahlen
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keywords collectivitycomparisonangle-integratedapproximationbeamcalculationscenter-of-masscharacter
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The neutron-rich nucleus 74Ni was studied with inverse-kinematics inelastic proton scattering using a 74Ni radioactive beam incident on a liquid hydrogen targetat a center-of-mass energy of 80 MeV. From the measured de-excitation gamma-rays, the population of the first 2+ state was quantified. The angle-integrated excitation cross section was determined to be 14(4) mb. A deformation length of delta = 1.04(16) fm was extracted in comparison with distorted wave theory, which suggests that the enhancement of collectivity established for 70Ni continues up to 74Ni. A comparison with results of shell model and quasi-particle random phase approximation calculations indicates that the magic character of Z = 28 or N = 50 is weakened in 74Ni.

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