J.P. O'Neil

Low-lying resonant states in {sup 16}F using a {sup 15}O radioactive ion beam

Study of low-lying resonant states in 16 F using an 15 O radioactive ion beam D. W. Lee 1,2,* , K. Perajarvi 1,† , J. Powell 1,3 , J. P. O’Neil 3 , D. M. Moltz 4 , V. Z. Goldberg 5 and Joseph Cerny 1,4 Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA Department of Nuclear Engineering, University of California, Berkeley, California 94720, USA Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA Department of Chemistry, University of California, Berkeley, California 94720, USA Texas A&M University, Cyclotron Institute, College Station, Texas 77843, USA PACS: 27.20.+n, 25.40.Cm, 25.60.Bx, 21.10.Dr Abstract A 120 MeV O radioactive ion beam with an intensity on target of 4.5×10 4 pps has been developed at the 88-inch cyclotron at the Lawrence Berkeley National Laboratory. This beam has been used to study the level structure of F at low energies via the p( 15 O,p) reaction using the thick target inverse kinematics method on a polyethylene target. The experimental excitation function was analyzed using R-matrix calculations. Significantly improved values for the level widths of the four low-lying states in F are reported. Good agreement with the theoretical spectroscopic factors is also obtained. Electronic address : dwlee@lbl.gov Present address : Radiation and Nuclear Safety Authority, Helsinki, Finland