M. F. Makela

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The UCNA collaboration is making a precision measurement of the β asymmetry (A) in free neutron decay using polarized ultracold neutrons (UCN). A critical component of this experiment is an adiabatic fast passage neutron spin flipper capable of efficient operation in ambient magnetic fields on the order of 1 T. The requirement that it operate in a high(More)
The radial spread of charged particles emitted from a point source in a magnetic field is a potential source of systematic error for any experiment where magnetic fields guide charged particles to detectors with finite size. Assuming uniform probability as a function of the phase along the particle's helical trajectory, an analytic solution for the radial(More)
Currently several institutes worldwide are working on the development of a new generation of ultracold neutron (UCN) sources. In parallel with source development, new materials for guiding and storage of UCN are developed. Currently the best results have been achieved using (58)Ni, Be, solid O2 and low temperature Fomblin oil (LTF). All of these materials(More)
In this paper, we describe the performance of the Los Alamos spallation-driven solid-deuterium ultra-cold neutron (UCN) source. Measurements of the cold neutron flux, the very low energy neutron production rate, and the UCN rates and density at the exit from the biological shield are presented and compared to Monte Carlo predictions. The cold neutron rates(More)
E. I. Sharapov, C. L. Morris, ∗ M. Makela, A. Saunders, Evan R. Adamek, L. J. Broussard, C. B. Cude-Woods, Deion E Fellers, Peter Geltenbort, M. Hartl, S. I. Hasan, K. P. Hickerson, G. Hogan, A. T. Holley, C. M. Lavelle, Chen-Yu Liu, M. P. Mendenhall, J. Ortiz, R. W. Pattie Jr., D. G. Phillips II, J. Ramsey, D. J. Salvat, S. J. Seestrom, E. Shaw, Sky Sjue,(More)
J. David Bowman, L. J. Broussard, S. M. Clayton, M. S. Dewey, N. Fomin, K. B. Grammer, G. L. Greene, 1, † P. R. Huffman, A. T. Holley, G. L. Jones, C.-Y. Liu, M. Makela, M. P. Mendenhall, C. L. Morris, J. Mulholland, K. M. Nollett, 10 R. W. Pattie, Jr., S. Penttilä, M. Ramsey-Musolf, D. J. Salvat, 2 A. Saunders, S. J. Seestrom, W. M. Snow, A. Steyerl, F. E.(More)
When a novel neutron-capture lithium pulse-mode ionization chamber (LiPMIC) was designed to replace He proportional counters as a more economical solution for some homeland security and counter-terrorism applications for large-scale, long-term remote sensors, this brought on a fundamental disadvantage of possibly exposing the ionization chamber to outgas(More)
We describe a detection system designed for precise measurements of angular correlations in neutron β decay. The system is based on thick, large area, highly segmented silicon detectors developed in collaboration with Micron Semiconductor, Ltd. The prototype system meets specifications for β electron detection with energy thresholds below 10 keV, energy(More)
The “Nab” and “UCNB” collaborations have proposed to measure the correlation parameters in neutron β-decay at Oak Ridge and Los Alamos National Laboratory, using a novel detector design. Two large area, thick, hexagonal-segmented silicon detectors containing 127 pixels per detector will be used to detect the proton and electron from neutron decay. Both(More)
http://sro.sussex.ac.uk Ito, T M, Ramsey, J C, Yao, W, Beck, D H, Cianciolo, V, Clayton, S M, Crawford, C, Currie, S A, Filippone, B W, Griffith, W C, Makela, M, Schmid, R, Seidel, G M, Tang, Z, Wagner, D et al. (2016) An apparatus for studying electrical breakdown in liquid helium at 0.4 K and testing electrode materials for the SNS nEDM experiment. Review(More)