Elsevier

Physics Letters B

Volume 692, Issue 5, 13 September 2010, Pages 302-306
Physics Letters B

Enhanced collectivity in 74Ni

https://doi.org/10.1016/j.physletb.2010.07.052Get rights and content
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Abstract

The neutron-rich nucleus 74Ni was studied with inverse-kinematics inelastic proton scattering using a 74Ni radioactive beam incident on a liquid hydrogen target at a center-of-mass energy of 80 MeV. From the measured de-excitation γ 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 δ=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.

Keywords

Proton inelastic scattering
Quadrupole collectivity
74Ni

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