A beamline zero‐degree spectrometer for measurements of projectile fragment distributions

• Published in: Review of scientific instruments 1991-02, Vol.62 (2), p.342-349
• Main Authors: Souliotis, G. A., Morrissey, D. J., Sherrill, B. M.
• Format: Article
• Language: English
• Subjects: Atomic, molecular and charged-particle sources and detectors; Charged-particle beam sources and detectors; Exact sciences and technology; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Physics
• ISSN: 0034-6748; 1089-7623
• DOI: 10.1063/1.1142125

A technique for using a section of a beamline as a zero‐degree spectrometer is described. The beamline magnets of the K1200 cyclotron at NSCL were operated as a zero‐degree medium acceptance spectrometer to measure projectile fragment distributions. Projectile fragments were produced in a fragmentation target at the exit of the cyclotron and detected at the end of the beamline with a detector array consisting of two position‐sensitive detectors and a ΔE−E telescope. Energy loss, position and angle at the focal plane and time of flight were measured for the isotopes produced. A procedure was developed to calculate the reaction angle and the momentum of the isotopes from the measured quantities. Typical examples of momentum and angular distributions of projectile fragments from a 14N beam at 75 MeV/u with Al and Ta targets at and near 0° are shown.