A prototype for SONTRAC, a scintillating plastic fiber tracking detector for neutron imaging and spectroscopy

We report on tests of a prototype detector system designed to perform imaging and spectroscopy on 20 to 250 MeV neutrons. Although developed for the study of high-energy solar flare processes, the detection techniques employed for SONTRAC, the SOlar Neutron TRACking experiment, can be applied to measurements in a variety of disciplines including atmospheric physics, radiation therapy and nuclear materials monitoring. The SONTRAC instrument measures the energy and direction ofneutrons by detecting double neutron-proton scatters and recording images of the ionization tracks of the recoil protons in a densely packed bundle of scintillating plastic fibers stacked in orthogonal layers. By tracking the recoil protons from individual neutrons, the kinematics of the scatter are determined. This directional information results in a high signal to noise measurement. SONTRAC is also capable of detecting and measuring high-energy gamma rays \u3e20 MeV as a “solid-state spark chamber”. The self-triggering and track imaging features of a prototype for tracking in two dimensions are demonstrated in calibrations with cosmic-ray muons, 14 to ~65 MeV neutrons and ~20 MeV protons

Positive parity levels in 36S observed in the 37Cl(d, 3He)36S reaction

Transition to the 36S ground state and excited states at 3.30, 4.57, 6.51, 7.11 and 7.69 MeV were observed in the reaction 37Cl(d, 3He)36S at a bombarding energy of 28.9 MeV. Using distorted wave analysis, l-values and strength coefficients C2S were extracted from the measured angular distributions. The results are in reasonable agreement with calculations by Glaudemans et al.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/33212/1/0000601.pd

Study of the structure of 36S and 38Ar

The 37Cl(d, 3He)36S and 39K(d, 3He)38 Ar reactions have been studied at a bombarding energy of 28.9 MeV. The results are compared with theoretical calculations for two or four holes in the sd-shell. The three-hole spectrum of 37Cl is also briefly discussed. In the calculation for 38Ar, additional states of a two-particle four-hole nature are included. In 38Ar, the ground state and levels at 2.166 and 7.14 MeV are excited principally by l = 2 transfer, while transitions with appreciable l = 0 strength are observed to levels at 3.935, 4.569, 5.158 and 5.563 MeV. This fragmentation is quite well reproduced by the inclusion of the 2p-4h states. In particular the level at 3.935 MeV is largely of this type, a conclusion supported by both the spectroscopic factors and [gamma] transition rates. The 36S ground state and levels at 6.511 and 7.12 MeV in 36S have angular distributions characteristic of l = 2. Three transitions with l = 0 strength are observed to levels at 3.295, 4.523 and 4.577 MeV in this nucleus. An additional level was identified at 7.71 MeV but the l-transfer could not be determined. The data are only qualitatively reproduced by the four-hole calculation, which while useful in making probable J[pi] assignments, suggests that core excitation is important here also.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/32822/1/0000196.pd

The University of Michigan neutron time-of-flight facility

The details of the neutron time-of-flight instrumentation associated with The University of Michigan 83" cyclotron are described and examples of capabilities of the instrument are given.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/22316/1/0000761.pd

Demonstration and evaluation of "solid-state" photomultiplier tube for uranium exploration instrumentation : final report /

"April 1979."At head of title: National Uranium Resource Evaluation.Prepared for the U.S. Department of Energy Assistant Secretary for Resource Applications, Grand Junction Office, Colorado under Contract No. DE-AC13-76GJO1664 and Bendix Field Engineering Corporation Subcontract No. 78-084-L.Mode of access: Internet