In-beam {gamma}-ray spectroscopy and inclusive two-proton knockout cross section measurements at N{approx_equal}40

• Published in: Physical review. C, Nuclear physics Nuclear physics, 2008-05, Vol.77 (5)
• Main Authors: Adrich, P., Bazin, D., Galaviz, D., Obertelli, A., Shimbara, Y., Weisshaar, D., Amthor, A. M., Bowen, M. D., Brown, B. A., Campbell, C. M., Cook, J. M., Gade, A., Glasmacher, T., McDaniel, S., Miller, D., Siwek, K. P., Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, Tostevin, J. A.
• Format: Article
• Language: English
• Subjects: BERYLLIUM 9 TARGET; CHROMIUM 64; COBALT; CONFIGURATION; CROSS SECTIONS; EXCITED STATES; GAMMA RADIATION; GAMMA SPECTROSCOPY; IRON 66; IRON 68; ISOTOPE PRODUCTION; KNOCK-OUT REACTIONS; NICKEL; NICKEL 68; NUCLEAR PHYSICS AND RADIATION PHYSICS; NUCLEAR REACTIONS; PROTONS; SECONDARY BEAMS
• ISSN: 0556-2813; 1089-490X
• DOI: 10.1103/PHYSREVC.77.054306

In-beam {gamma}-ray spectroscopy of {sup 66,68}Fe following intermediate-energy one- and two-proton knockout from cobalt and nickel secondary beams has been performed at the National Superconducting Cyclotron Laboratory. New transitions have been observed in {sup 66}Fe and {sup 68}Fe. This is the first observation of {gamma}-ray transitions in {sup 68}Fe. In addition, {sup 64}Cr was produced using the {sup 9}Be({sup 66}Fe,{sup 64}Cr)X two-proton knockout reaction. An unexpectedly low inclusive cross section is observed for this reaction, an order of magnitude smaller than for the {sup 9}Be({sup 68}Ni,{sup 66}Fe)X reaction. This observation is discussed in terms of a significant structural difference between {sup 66}Fe and {sup 64}Cr and considerable admixtures of {nu}(pf){sup n-2}(g{sub 9/2}){sup +2} configurations in the ground and excited states of {sup 64}Cr at N=40.