Resonance fluorescence has been used for measuring the widths of over 42 levels in Ar below 11 MeV by employing Ge(Li) detectors and bremsstrahlung beams with end point energies of 8.5, 10.3, and 11. 8 MeV. The gI 0/I of these levels were measured, and several J =1 levels were identified.A strong photon strength was found, extending between 8 and 11 MeV which complements a bump observed between 10.4 and 12.4 MeV using the (y,n) reaction. This behavior is theoretically explained using the open-shell-linear-response method.

A 52 quadrupole-magnet FODO lattice has been assembled and operated at the Los Alamos National Laboratory. The purpose of this lattice is to provide a platform to measure the resulting beam halo as the first four magnets of the lattice produce various mismatch conditions. These data are then compared with particle simulations so that halo formation mechanisms may be better understood. The lattice is appended to the LEDA 6.7-MeV radio frequency quadrupole (RFQ) and is followed by a short high-energy beam transport (HEBT) that safely dumps the beam into a 670-kW beam stop. Beam diagnostic instruments are interspersed within the lattice and HEBT. The primary instruments for measuring the beam halo are nine interceptive devices that acquire the beam's horizontal and vertical projected particle density distributions out to approximately 10 5 :1 dynamic range. These distributions are acquired using both traditional wire scanners and water-cooled graphite scraping devices. The lattice and HEBT instrumentation set also includes position, bunched-beam current, pulsed current, and beam loss measurements. This paper briefly describes and details the operation of each instrument, compares measured data from the different types of instruments, and refers to other detailed papers.

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Resonance fluorescence is used for measuring the widths of 13 levels in Ca below 10.4MeV among which nine E2 transitions were identified. The total E2 strength of those nine levels together with some other known 2+ levels below 10 MeV exhausts -22% of the energy weighted sum rule. The partial and total widths of the strong M 1 state at 10.32 MeV are compared with theory. NUCLEAR REACTIONSCa(y, y'), E =8.5, 11. 3, 11. 7 MeV bremsstrahlung. Deduced I 0, I'(E2), I (M 1). Natural target.