A monochromatic neutron facility for (n,p) reactions

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• 作者：Hanna ; S.S. ; Martoff ; C.J. ; Pocanic ; D. ; Wang ; K. ; Byrd ; R.C. ; Foster ; C.C. ; van Heerden ; I.J.
• 关键词：24.30.Cz ; 25.40.Kv ; 29.25.Dz ; 29.40.Wk ; (n ; p) reaction ; Neutron source ; Proton spectroscopy ; Angular distribution
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：1997
• 出版时间：December 21, 1997
• 年：1997
• 卷：401
• 期：2-3
• 页码：345-354
• 全文大小：730 K

文摘

A neutron facility for the study of (n,p) reactions was set up at the Indiana University Cyclotron Facility. The neutrons were produced by the reaction ⁷Li(p,n)⁷Be. The energy spread of the neutron beam is dominated by the thickness of the ⁷Li production target. At the (n,p) target the collimated neutron-beam intensity is about 10⁵ n/s/cm² for a 1 μA proton beam at 120 MeV on a ⁷Li target 100 mg/cm² thick. The distance between the neutron production target and the (n,p) target, 3.14 m, makes it possible by time-of-flight to eliminate neutrons degraded below the maximum energy by scattering. Protons from the (n,p) reaction are detected simultaneously at three laboratory angles (7.5°, 12.5°, and 17.5°), in three particle telescopes each consisting typically of three hyperpure Ge elements. All three telescopes are mounted in a common cryostat. Spectra are obtained at other angles including zero by magnetically deflecting the (n,p) protons. Spectra recorded at E_n = 118 MeV for (n,p) reactions on several light nuclei are presented.