We are developing a miniature neutron-alpha activation spectrometer for in-situ analysis of chem-bio samples, including rocks, fines, ices, and drill cores, suitable for a lander or Rover platform for Mars or outer-planet missions. In the neutron-activation mode, penetrating analysis will be performed of the whole sample using a y spectrometer and in the ex-activation mode, the sample surface w...

A compact neutron spectrometer, based on a CH foil for the production of recoil protons and CR-39 detection, is being developed for the measurements of the DD-neutron spectrum at the NIF, OMEGA, and Z facilities. As a CR-39 detector will be used in the spectrometer, the principal sources of background are neutron-induced tracks and intrinsic tracks (defects in the CR-39). To reject the backgrou...

The design and performance of the new cold neutron chopper spectrometer (CNCS) at the Spallation Neutron Source in Oak Ridge are described. CNCS is a direct-geometry inelastic time-of-flight spectrometer, designed essentially to cover the same energy and momentum transfer ranges as IN5 at ILL, LET at ISIS, DCS at NIST, TOFTOF at FRM-II, AMATERAS at J-PARC, PHAROS at LANSCE, and NEAT at HZB, at ...

Introduction: Results from Mars Odyssey's highenergy neutron spectrometer, and gamma ray spectrometer have shown that there is 15 to 20% ice in the top meter of Martian regolith at latitudes of +/-55 degrees [1,2,3]. This observation has been critical in understanding the nature of patterned ground on Mars [4]. The resolution of the ground ice maps generated from these instruments, however, is ...

We describe an electron spectrometer designed for a precision measurement of the neutron β-asymmetry with spin-polarized ultracold neutrons. The spectrometer consists of a 1.0-Tesla solenoidal field with two identical multiwire proportional chamber and plastic scintillator electron detector packages situated within 0.6-Tesla fieldexpansion regions. Select results from performance studies of the...

The recent developments of the neutron scattering instruments at the DR3 10 MW steady state reactor and other related facilities at Risø National Laboratory are described. The motivation for starting these developments is to optimise the available cold and thermal neutron flux as cost effective as possible. This has led to the implementation of the RITA neutron spectrometer and the germanium mo...