J. A. Nolen

PIONS PRODUCED NEAR THE CENTER-OF-MASS VELOCITY IN HEAVY-ION COLLISIONS

LBL-12585 Preprint i Submitted to Physical Review Letters i_.i PIONS PRODUCED NEAR THE CENTER-OF-MASS VELOCITY IN HEAVY-!ON COLLISIONS K.A. Frankel, J.A. Bistirlich, R. Bossingham, H.R. Bowman, K.M. Crowe, C.J .. Martoff, D. Murphy, J.O. Rasmussen, J.P. Sullivan, W.A. Zajc, J.P. Miller, 0. Hashimoto, M. Koike, J. P~ter, W. Benenson, G.M. Crawley, E. Kashy, J.A. Nolen, Jr., and J. Quebert August 1981 TWO-WEEK LOAN COPY This is a library Circulating Copy which may be borrowed for two weeks.· For a personal retention copy, call Tech. Info. Diu is ion, Ext. 6782 Prepared for the U.S. Department of Energy under Contract W-7405-ENG-48

Experimental study of the {sup 56}Ni({sup 3}He,d){sup 57}Cu reaction in inverse kinematics

Measurements of ({sup 3}He,d) reactions can provide information on the proton widths of states that play a role in astrophysically important (p,{gamma}) reactions. We report on the first study of the ({sup 3}He,d) reaction in inverse kinematics with a {sup 56}Ni (T{sub 1/2}=6.1 d) ion beam. The Q-value resolution of {approx} keV achieved in this experiment was sufficient to separate the transitions populating the ground state and the 1/2{sup -}-5/2{sup -} doublet at E{sub x}{approx}1.1 MeV in {sup 57}Cu. Prospects for similar ({sup 3}He,d) experiments with improved energy resolution are also discussed.

On-line correction of aberrations in particle spectrographs

A new method is presented that allows the reconstruction of trajectories and the on-line correction of residual aberrations that limit the resolution of particle spectrographs. Using a computed or fitted high order transfer map that describes the uncorrected aberrations of the spectrograph under consideration, it is possible to determine a pseudo transfer map that allows the computation of the corrected data of interest as well as the reconstructed trajectories in terms of position measurements in two planes near the focal plane. The technique is only limited by the accuracy of the position measurements and the accuracy of the transfer map. In practice the method can be expressed as an inversion of a pseudo transfer map and implemented in the differential algebraic framework. The practical application in connection with the S800 spectrograph is discussed.<<ETX>>