@article{dhanmeher_bodek_choi_de keukeleere_engler_gupta_kozela_łojek_pysz_ries_et al._2023, title={BRAND—A detection system for β-decay correlation measurement}, volume={1048}, ISSN={0168-9002}, url={http://dx.doi.org/10.1016/j.nima.2022.167955}, DOI={10.1016/j.nima.2022.167955}, abstractNote={The BRAND experiment aims at the search of Beyond Standard Model (BSM) physics via measurement of exotic components of the weak interaction. For this purpose, eleven correlation coefficients of neutron β-decay will be measured simultaneously. The BRAND detection system is oriented for the registration of charged products of β-decay of polarized, free neutrons. With the measurement of the four-momenta of electron and proton, the complete kinematic of the decay will be determined. Moreover, the transverse spin component of the electron, which is the crucial observable to probe BSM exotic components of weak interaction, will be measured via Mott scattering. The electron detection system features both tracking and energy measurement capability. It is also responsible for the determination of the electron spin orientation. A challenging detection of low-energy protons from the β-decay is performed with a system, which involves the acceleration and subsequent conversion of protons into bunches of electrons. To test the feasibility of the proposed experimental techniques, a small-scale prototype setup was installed at the cold neutron beam facility PF1B at the Laue-Langevin Institute (ILL) in Grenoble, France. In this contribution, the preliminary results of the commissioning run are presented with an emphasis on the performance of individual parts of the detection system.}, journal={Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment}, publisher={Elsevier BV}, author={Dhanmeher, K. and Bodek, K. and Choi, J. and De Keukeleere, L. and Engler, M. and Gupta, G. and Kozela, A. and Łojek, K. and Pysz, K. and Ries, D. and et al.}, year={2023}, month={Mar}, pages={167955} }
 @article{kozela_bodek_choi_dekeukeleere_dhanmeher_engler_gupta_lojek_pysz_ries_et al._2023, title={Search for beyond standard model physics in free neutron decay}, volume={2586}, ISBN={["*****************"]}, ISSN={["1742-6596"]}, DOI={10.1088/1742-6596/2586/1/012139}, abstractNote={Abstract}, journal={28TH INTERNATIONAL NUCLEAR PHYSICS CONFERENCE, INPC 2022}, author={Kozela, A. and Bodek, K. and Choi, J. and DeKeukeleere, L. and Dhanmeher, K. and Engler, M. and Gupta, G. and Lojek, K. and Pysz, K. and Ries, D. and et al.}, year={2023} }
 @article{cude-woods_gonzalez_fries_bailey_blatnik_callahan_choi_clayton_currie_dawid_et al._2022, title={Fill and dump measurement of the neutron lifetime using an asymmetric magneto-gravitational trap}, volume={106}, ISSN={["2469-9993"]}, DOI={10.1103/PhysRevC.106.065506}, abstractNote={The past two decades have yielded several new measurements and reanalyses of older measurements of the neutron lifetime. These have led to a 4.4 standard deviation discrepancy between the most precise measurements of the neutron decay rate producing protons in cold neutron beams and the lifetime measured in neutron storage experiments. Measurements using different techniques are important for investigating whether there are unidentified systematic effects in any of the measurements . In this paper we report a new measurement using the Los Alamos asymmetric magneto-gravitational trap where the surviving neutrons are counted external to the trap using the fill and dump method. The new measurement gives a free neutron lifetime of Although this measurement is not as precise, it is in statistical agreement with previous results using in situ counting in the same apparatus.}, number={6}, journal={PHYSICAL REVIEW C}, author={Cude-Woods, C. and Gonzalez, F. M. and Fries, E. M. and Bailey, T. and Blatnik, M. and Callahan, N. B. and Choi, J. H. and Clayton, S. M. and Currie, S. A. and Dawid, M. and et al.}, year={2022}, month={Dec} }
 @article{gonzalez_fries_cude-woods_bailey_blatnik_broussard_callahan_choi_clayton_currie_et al._2021, title={Improved Neutron Lifetime Measurement with UCN τ}, volume={127}, ISSN={["1079-7114"]}, DOI={10.1103/PhysRevLett.127.162501}, abstractNote={We report an improved measurement of the free neutron lifetime τ_{n} using the UCNτ apparatus at the Los Alamos Neutron Science Center. We count a total of approximately 38×10^{6} surviving ultracold neutrons (UCNs) after storing in UCNτ's magnetogravitational trap over two data acquisition campaigns in 2017 and 2018. We extract τ_{n} from three blinded, independent analyses by both pairing long and short storage time runs to find a set of replicate τ_{n} measurements and by performing a global likelihood fit to all data while self-consistently incorporating the β-decay lifetime. Both techniques achieve consistent results and find a value τ_{n}=877.75±0.28_{stat}+0.22/-0.16_{syst}  s. With this sensitivity, neutron lifetime experiments now directly address the impact of recent refinements in our understanding of the standard model for neutron decay.}, number={16}, journal={PHYSICAL REVIEW LETTERS}, author={Gonzalez, F. M. and Fries, E. M. and Cude-Woods, C. and Bailey, T. and Blatnik, M. and Broussard, L. J. and Callahan, N. B. and Choi, J. H. and Clayton, S. M. and Currie, S. A. and et al.}, year={2021}, month={Oct}, pages={162501} }
 @article{kuk_cude-woods_chavez_choi_estrada_hoffbauer_holland_makela_morris_ramberg_et al._2021, title={Projection imaging with ultracold neutrons}, volume={1003}, ISSN={["1872-9576"]}, DOI={10.1016/j.nima.2021.165306}, abstractNote={Ultracold neutron (UCN) projection imaging is demonstrated using a boron-coated back-illuminated CCD camera and the Los Alamos UCN source. Each neutron is recorded through the capture reactions with 10B. By direct detection at least one of the byproducts α, 7Li and γ (electron recoils) derived from the neutron capture and reduction of thermal noise of the scientific CCD camera, a signal-to-noise improvement on the order of 104 over the indirect detection has been achieved. Sub-pixel position resolution of a few microns is confirmed for individual UCN events. Projection imaging of test objects shows a spatial resolution less than 100μm by an integrated UCN flux one the order of 106 cm−2. The bCCD can be used to build UCN detectors with an area on the order of 1 m2. The combination of micrometer scale spatial resolution, low readout noise of a few electrons, and large area makes bCCD suitable for quantum science of UCN.}, journal={NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT}, author={Kuk, K. and Cude-Woods, C. and Chavez, C. R. and Choi, J. H. and Estrada, J. and Hoffbauer, M. and Holland, S. E. and Makela, M. and Morris, C. L. and Ramberg, E. and et al.}, year={2021}, month={Jul} }
 @article{tang_watkins_clayton_currie_fellers_hassan_hooks_ito_lawrence_macdonald_et al._2021, title={Ultracold neutron properties of the Eljen-299-02D deuterated scintillator}, volume={92}, ISSN={["1089-7623"]}, DOI={10.1063/5.0030972}, abstractNote={In this paper, we report studies of the Fermi potential and loss per bounce of ultracold neutrons (UCNs) on a deuterated scintillator (Eljen-299-02D). These UCN properties of the scintillator enable its use in a wide variety of applications in fundamental neutron research.}, number={2}, journal={REVIEW OF SCIENTIFIC INSTRUMENTS}, author={Tang, Z. and Watkins, E. B. and Clayton, S. M. and Currie, S. A. and Fellers, D. E. and Hassan, Md T. and Hooks, D. E. and Ito, T. M. and Lawrence, S. K. and MacDonald, S. W. T. and et al.}, year={2021}, month={Feb} }
 @article{ito_adamek_callahan_choi_clayton_cude-woods_currie_ding_fellers_geltenbort_et al._2018, title={Performance of the upgraded ultracold neutron source at Los Alamos National Laboratory and its implication for a possible neutron electric dipole moment experiment}, volume={97}, ISSN={2469-9993}, DOI={10.1103/physrevc.97.012501}, abstractNote={The ultracold neutron (UCN) source at Los Alamos National Laboratory (LANL), which uses solid deuterium as the UCN converter and is driven by accelerator spallation neutrons, has been successfully operated for over 10 years, providing UCN to various experiments, as the first production UCN source based on the superthermal process. It has recently undergone a major upgrade. This paper describes the design and performance of the upgraded LANL UCN source. Measurements of the cold neutron spectrum and UCN density are presented and compared to Monte Carlo predictions. The source is shown to perform as modeled. The UCN density measured at the exit of the biological shield was $184(32)$ UCN/cm$^3$, a four-fold increase from the highest previously reported. The polarized UCN density stored in an external chamber was measured to be $39(7)$ UCN/cm$^3$, which is sufficient to perform an experiment to search for the nonzero neutron electric dipole moment with a one-standard-deviation sensitivity of $\sigma(d_n) = 3\times 10^{-27}$ $e\cdot$cm.}, number={1}, journal={PHYSICAL REVIEW C}, author={Ito, T. M. and Adamek, E. R. and Callahan, N. B. and Choi, J. H. and Clayton, S. M. and Cude-Woods, C. and Currie, S. and Ding, X. and Fellers, D. E. and Geltenbort, P. and et al.}, year={2018}, month={Jan} }
 @article{tang_blatnik_broussard_choi_clayton_cude-woods_currie_fellers_fries_geltenbort_et al._2018, title={Search for the Neutron Decay n -> X plus gamma Where X is a Dark Matter Particle}, volume={121}, ISSN={["1079-7114"]}, DOI={10.1103/physrevlett.121.022505}, abstractNote={Fornal and Grinstein recently proposed that the discrepancy between two different methods of neutron lifetime measurements, the beam and bottle methods, can be explained by a previously unobserved dark matter decay mode, n→X+γ. We perform a search for this decay mode over the allowed range of energies of the monoenergetic γ ray for X to be dark matter. A Compton-suppressed high-purity germanium detector is used to identify γ rays from neutron decay in a nickel-phosphorous-coated stainless-steel bottle. A combination of Monte Carlo and radioactive source calibrations is used to determine the absolute efficiency for detecting γ rays arising from the dark matter decay mode. We exclude the possibility of a sufficiently strong branch to explain the lifetime discrepancy with 97% confidence.}, number={2}, journal={PHYSICAL REVIEW LETTERS}, author={Tang, Z. and Blatnik, M. and Broussard, L. J. and Choi, J. H. and Clayton, S. M. and Cude-Woods, C. and Currie, S. and Fellers, D. E. and Fries, E. M. and Geltenbort, P. and et al.}, year={2018}, month={Jul} }