High-precision B(E2) measurements of semi-magic 58,60,62,64Ni by Coulomb excitation

Journal Article · Wed Jan 01 00:00:00 EST 2014 · Physical Review C

OSTI ID:1156740

Allmond, James M ^[1]; Brown, Alex ^[2]; Stuchbery, Andrew E ^[1]; Padilla-Rodal, Elizabeth ^[3]; Radford, David C ^[1]; Batchelder, J. C. ^[4]; Howard, Meredith E ^[1]; Liang, J Felix ^[1]; Manning, Brett M ^[1]; Varner, Jr, Robert L ^[1]; Yu, Chang-Hong ^[1]

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1. ORNL
2. National Superconducting Cyclotron Laboratory (NSCL), Michigan State University
3. Universidad Nacional Autonoma de Mexico (UNAM)
4. Oak Ridge Associated Universities (ORAU)

High-precision reduced electric-quadrupole transition probabilities B(E2) have been measured from single-step Coulomb excitation of semi-magic 58,60,62,64 Ni (Z = 28) beams at 1.8 MeV per nucleon on a natural carbon target. The energy loss of the nickel beams through the carbon target were directly measured with a zero-degree Bragg detector and the absolute B(E2) values were normalized by Rutherford scattering. The B(E2) values disagree with recent lifetime studies that employed the Doppler-shift attenuation method. The present high-precision B(E2) values reveal an asymmetry about 62 Ni, midshell between N = 28 and 40, with larger values towards 56 Ni (Z = N = 28). The experimental B(E2) values are compared with shell-model calculations in the full pf model space and the results indicate a soft 56 Ni core.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Holifield Radioactive Ion Beam Facility (HRIBF)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1156740
• Journal Information: Physical Review C, Vol. 90, Issue 034309
• Country of Publication: United States
• Language: English