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1. Gravitational Resonance Spectroscopy with an Oscillating Magnetic Field Gradient in the GRANIT Flow through Arrangement

Author: G. Pignol, S. Baeßler, V. V. Nesvizhevsky, K. Protasov, D. Rebreyend, and A. Voronin
Subjects: Physics, QC1-999
Abstract: Gravitational resonance spectroscopy consists in measuring the energy spectrum of bouncing ultracold neutrons above a mirror by inducing resonant transitions between different discrete quantum levels. We discuss how to induce the resonances with a flow through arrangement in the GRANIT spectrometer, excited by an oscillating magnetic field gradient. The spectroscopy could be realized in two distinct modes (so called DC and AC) using the same device to produce the magnetic excitation. We present calculations demonstrating the feasibility of the newly proposed AC mode.
Published: 2014
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2. Measurement of the anomalous precession frequency of the muon in the Fermilab Muon <math><mi>g</mi><mo>−</mo><mn>2</mn></math> Experiment

Author: P. Bloom, P. Kammel, Timothy Chupp, C. Schlesier, P. Girotti, M. J. Lee, A. Nath, Frederick Gray, C. Gabbanini, D. Shemyakin, C. C. Polly, L. Cotrozzi, V. N. Duginov, G. Venanzoni, T. Stuttard, G. Lukicov, M. Iacovacci, H. E. Swanson, T. P. Gorringe, B. C.K. Casey, J. Grange, N. H. Tran, K. W. Hong, K. T. Pitts, R. T. Chislett, Fabrizio Marignetti, A. Lucà, Martin Fertl, E. Barlas-Yucel, J. George, A. Kuchibhotla, Dariush Hampai, T. Walton, D. Cauz, G. Sweetmore, J. Bono, I. R. Bailey, Dinko Pocanic, J. L. Holzbauer, Gavin Grant Hesketh, J. L. Ritchie, Alexander Keshavarzi, H. P. Binney, A. García, Manolis Kargiantoulakis, A. Basti, Barry King, B. MacCoy, M. Kiburg, David Rubin, Alexey Anisenkov, V. Tishchenko, Marin Karuza, H. Nguyen, P. Di Meo, Claudio Ferrari, N. Kinnaird, Liang Li, L. K. Gibbons, N. Raha, R. Chakraborty, D. Flay, R. N. Pilato, M. Incagli, M. Lancaster, Michael Syphers, S. Baeßler, T. J. V. Bowcock, J. LaBounty, G. M. Piacentino, D. Vasilkova, S. Park, A. Lusiani, T. Albahri, R. Madrak, Z. Hodge, Dominik Stöckinger, A. Chapelain, Brad Plaster, R. M. Carey, Dongdong Li, J. D. Crnkovic, D. W. Hertzog, Selcuk Haciomeroglu, J. P. Miller, Andrzej Wolski, Tabitha Halewood-leagas, Franco Bedeschi, B. L. Roberts, S. Grant, J. Fry, Kyoko Makino, J.B. Hempstead, S. Di Falco, K. S. Khaw, W. Turner, Z. Chu, A. T. Herrod, J. D. Price, T. Barrett, N. V. Khomutov, M. Farooq, P. Winter, J. Stapleton, R. Fatemi, D. Kawall, S. Charity, L. Santi, A. Schreckenberger, E. Valetov, B. Quinn, Yannis K. Semertzidis, B. Li, K. L. Giovanetti, A. E. Tewsley-Booth, S. Lee, Ran Hong, S. Leo, M. D. Galati, A.T. Fienberg, Sultan B. Dabagov, S. P. Chang, L. Kelton, G. Pauletta, Rachel Osofsky, G. Di Sciascio, S. Ganguly, D.A. Sweigart, Meghna Bhattacharya, Thomas Teubner, A. Gioiosa, S. Miozzi, B. Kiburg, J. Esquivel, A. Lorente Campos, David Kessler, E. Bottalico, M. Sorbara, Christopher Stoughton, J. Mott, Kayleigh Anne Thomson, Giovanni Cantatore, A. Fioretti, A. Anastasi, Wanwei Wu, Karie Badgley, S. Mastroianni, O. Kim, William Morse, L. Welty-Rieger, A. L. Lyon, A. Hibbert, A. Weisskopf, P. T. Debevec, W. Gohn, E. J. Ramberg, R. Di Stefano, E. Kraegeloh, Martin Berz, Z. Khechadoorian, S. Ramachandran, D. Stratakis, S. Corrodi, D. A. Tarazona, V. A. Baranov, J. Choi, F. Han, Nicholas A. Pohlman, M. Eads, I. Logashenko, N. A. Kuchinskiy, M. W. Smith, Y. I. Kim, A. Driutti, J. Kaspar, K. R. Labe, N. S. Froemming, E. Frlež, Albahri, T., Anastasi, A., Anisenkov, A., Badgley, K., Baeßler, S., Bailey, I., Baranov, V. A., Barlas-Yucel, E., Barrett, T., Basti, A., Bedeschi, F., Berz, M., Bhattacharya, M., Binney, H. P., Bloom, P., Bono, J., Bottalico, E., Bowcock, T., Cantatore, G., Carey, R. M., Casey, B. C. K., Cauz, D., Chakraborty, R., Chang, S. P., Chapelain, A., Charity, S., Chislett, R., Choi, J., Chu, Z., Chupp, T. E., Corrodi, S., Cotrozzi, L., Crnkovic, J. D., Dabagov, S., Debevec, P. T., Di Falco, S., Di Meo, P., Di Sciascio, G., Di Stefano, R., Driutti, A., Duginov, V. N., Eads, M., Esquivel, J., Farooq, M., Fatemi, R., Ferrari, C., Fertl, M., Fienberg, A. T., Fioretti, A., Flay, D., Frlež, E., Froemming, N. S., Fry, J., Gabbanini, C., Galati, M. D., Ganguly, S., Garcia, A., George, J., Gibbons, L. K., Gioiosa, A., Giovanetti, K. L., Girotti, P., Gohn, W., Gorringe, T., Grange, J., Grant, S., Gray, F., Haciomeroglu, S., Halewood-Leagas, T., Hampai, D., Han, F., Hempstead, J., Herrod, A. T., Hertzog, D. W., Hesketh, G., Hibbert, A., Hodge, Z., Holzbauer, J. L., Hong, K. W., Hong, R., Iacovacci, M., Incagli, M., Kammel, P., Kargiantoulakis, M., Karuza, M., Kaspar, J., Kawall, D., Kelton, L., Keshavarzi, A., Kessler, D., Khaw, K. S., Khechadoorian, Z., Khomutov, N. V., Kiburg, B., Kiburg, M., Kim, O., Kim, Y. I., King, B., Kinnaird, N., Kraegeloh, E., Kuchibhotla, A., Kuchinskiy, N. A., Labe, K. R., Labounty, J., Lancaster, M., Lee, M. J., Lee, S., Leo, S., Li, B., Li, D., Li, L., Logashenko, I., Lorente Campos, A., Lucà, A., Lukicov, G., Lusiani, A., Lyon, A. L., Maccoy, B., Madrak, R., Makino, K., Marignetti, F., Mastroianni, S., Miller, J. P., Miozzi, S., Morse, W. M., Mott, J., Nath, A., Nguyen, H., Osofsky, R., Park, S., Pauletta, G., Piacentino, G. M., Pilato, R. N., Pitts, K. T., Plaster, B., Počanić, D., Pohlman, N., Polly, C. C., Price, J., Quinn, B., Raha, N., Ramachandran, S., Ramberg, E., Ritchie, J. L., Roberts, B. L., Rubin, D. L., Santi, L., Schlesier, C., Schreckenberger, A., Semertzidis, Y. K., Shemyakin, D., Smith, M. W., Sorbara, M., Stöckinger, D., Stapleton, J., Stoughton, C., Stratakis, D., Stuttard, T., Swanson, H. E., Sweetmore, G., Sweigart, D. A., Syphers, M. J., Tarazona, D. A., Teubner, T., Tewsley-Booth, A. E., Thomson, K., Tishchenko, V., Tran, N. H., Turner, W., Valetov, E., Vasilkova, D., Venanzoni, G., Walton, T., Weisskopf, A., Welty-Rieger, L., Winter, P., Wolski, A., and Wu, W.
Subjects: Physics::Instrumentation and Detectors, Measure (physics), FOS: Physical sciences, 7. Clean energy, 01 natural sciences, Omega, High Energy Physics - Experiment, Nuclear physics, Nuclear Experiment, High Energy Physics - Experiment (hep-ex), muon, 0103 physical sciences, Fermilab, Nuclear Experiment (nucl-ex), 010306 general physics, Larmor precession, Physics, Muon, 010308 nuclear & particles physics, Settore FIS/01 - Fisica Sperimentale, anomalous magnetic moment, 3. Good health, Magnetic field, Physics::Accelerator Physics, High Energy Physics::Experiment, Storage ring, Fermi Gamma-ray Space Telescope
Abstract: The Muon g-2 Experiment at Fermi National Accelerator Laboratory (FNAL) has measured the muon anomalous precession frequency $\omega_a$ to an uncertainty of 434 parts per billion (ppb), statistical, and 56 ppb, systematic, with data collected in four storage ring configurations during its first physics run in 2018. When combined with a precision measurement of the magnetic field of the experiment's muon storage ring, the precession frequency measurement determines a muon magnetic anomaly of $a_{\mu}({\rm FNAL}) = 116\,592\,040(54) \times 10^{-11}$ (0.46 ppm). This article describes the multiple techniques employed in the reconstruction, analysis and fitting of the data to measure the precession frequency. It also presents the averaging of the results from the eleven separate determinations of \omega_a, and the systematic uncertainties on the result., Comment: 29 pages, 19 figures. Published in Physical Review D
Published: 2021

3. Systematic and statistical uncertainties of the hilbert-transform based high-precision FID frequency extraction method

Author: Ran Hong, B. Kiburg, H. E. Swanson, D. Kawall, Martin Fertl, Suvarna Ramachandran, Jimin George, J. Grange, Alejandro Garcia, Kyun Woo Hong, Simon Corrodi, A. E. Tewsley-Booth, D. Flay, Kevin Giovanetti, Timothy Gorringe, Bingzhi Li, Kai Zheng, J. Bono, Tianyu Yang, Liang Li, M. W. Smith, Rachel Osofsky, P. Winter, Timothy Chupp, Dinko Pocanic, Saskia Charity, and S. Baeßler
Subjects: 010302 applied physics, Larmor precession, Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Noise (signal processing), Covariance matrix, Mathematical analysis, Biophysics, FOS: Physical sciences, Absolute value, Instrumentation and Detectors (physics.ins-det), Condensed Matter Physics, 01 natural sciences, Biochemistry, Signal, Free induction decay, symbols.namesake, 0103 physical sciences, symbols, Hilbert transform, Uncertainty analysis
Abstract: Pulsed nuclear magnetic resonance (NMR) is widely used in high-precision magnetic field measurements. The absolute value of the magnetic field is determined from the precession frequency of nuclear magnetic moments. The Hilbert transform is one of the methods that have been used to extract the phase function from the observed free induction decay (FID) signal and then its frequency. In this paper, a detailed implementation of a Hilbert-transform based FID frequency extraction method is described, and it is briefly compared with other commonly used frequency extraction methods. How artifacts and noise level in the FID signal affect the extracted phase function are derived analytically. A method of mitigating the artifacts in the extracted phase function of an FID is discussed. Correlations between noises of the phase function samples are studied for different noise spectra. We discovered that the error covariance matrix for the extracted phase function is nearly singular and improper for constructing the χ 2 used in the fitting routine. A down-sampling method for fixing the singular covariance matrix has been developed, so that the minimum χ 2 -fit yields properly the statistical uncertainty of the extracted frequency. Other practical methods of obtaining the statistical uncertainty are also discussed.
Published: 2021

4. Magnetic Field Measurement and Analysis for the Muon g-2 Experiment at Fermilab

Author: Z. Chu, M. Eads, M. Lancaster, T. Halewood-Leagas, D. Flay, I. Logashenko, N. A. Kuchinskiy, M. W. Smith, Y. I. Kim, S.B. Dabagov, B. MacCoy, N. H. Tran, K. W. Hong, Liang Li, L. Santi, A. Chapelain, K. S. Khaw, K. T. Pitts, R. Fatemi, I. R. Bailey, E. Bottalico, Andrzej Wolski, R. N. Pilato, P. Bloom, M. Iacovacci, G. Pauletta, M. Incagli, R. Di Stefano, Timothy Chupp, E. Barlas-Yucel, G. Di Sciascio, G. Sweetmore, D. Cauz, P. Girotti, H. Nguyen, Thomas Teubner, D.A. Sweigart, A. E. Tewsley-Booth, G. Piacentino, D. Stöckinger, Karie Badgley, L. Kelton, P. Winter, Brad Plaster, J. L. Holzbauer, R. Chislett, B. Quinn, R. M. Carey, A. Conway, Kyoko Makino, A. Hibbert, B. C. K. Casey, A. Driutti, J. George, A. Lorente Campos, W. Turner, A. Lucà, S. Ramachandran, W. Wu, G. Hesketh, E. Valetov, E. Kraegeloh, Franco Bedeschi, A. Gioiosa, P. T. Debevec, L. Cotrozzi, V. N. Duginov, S. Corrodi, S. Miozzi, Yannis K. Semertzidis, M. J. Lee, S. Mastroianni, P. Di Meo, Martin Berz, K. L. Giovanetti, D. Stratakis, G. Lukicov, C. Gabbanini, J.B. Hempstead, A. Weisskopf, V. Tishchenko, B. Kiburg, H. E. Swanson, O. Kim, Michael Syphers, R. Osofsky, T. Stuttard, J. Esquivel, Dariush Hampai, T. J. V. Bowcock, Adam L. Lyon, Z. Khechadoorian, Meghna Bhattacharya, T. Barrett, Martin Fertl, D. Shemyakin, V. A. Baranov, Manolis Kargiantoulakis, R. Madrak, Marin Karuza, D. Vasilkova, S. Park, N. Kinnaird, A. Lusiani, T. Albahri, E. Ramberg, Nicholas A. Pohlman, D. Kawall, A. Schreckenberger, J. L. Ritchie, A. T. Herrod, Selcuk Haciomeroglu, L. K. Gibbons, J. Stapleton, Fabrizio Marignetti, K. Thomson, J. LaBounty, W. Gohn, G. Venanzoni, B. Li, Claudio Ferrari, Dinko Pocanic, S. P. Chang, S. Charity, T. Walton, T. P. Gorringe, Benjamin T. King, A. Fioretti, A. Anastasi, Sudeshna Ganguly, S. Lee, Ran Hong, M. D. Galati, A.T. Fienberg, William Morse, L. Welty-Rieger, Alejandro Garcia, J. Grange, J. Choi, Dongdong Li, D. W. Hertzog, A. Keshavarzi, M. Sorbara, F. Han, J. Bono, J. Mott, P. Kammel, C. Schlesier, Giovanni Cantatore, S. Di Falco, R. Chakraborty, C. C. Polly, J. P. Miller, M. Kiburg, J. Kaspar, David Rubin, S. Baeßler, K. R. Labe, N. S. Froemming, H. P. Binney, B. L. Roberts, S. Grant, J. Price, N. Raha, Z. Hodge, N. V. Khomutov, M. Farooq, Jason Crnkovic, D. A. Tarazona, C. Stoughton, A. Nath, Frederick Gray, David Kessler, Albahri, T., Anastasi, A., Badgley, K., Baessler, S., Bailey, I., Baranov, V. A., Barlas-Yucel, E., Barrett, T., Bedeschi, F., Berz, M., Bhattacharya, M., Binney, H. P., Bloom, P., Bono, J., Bottalico, E., Bowcock, T., Cantatore, G., Carey, R. M., Casey, B. C. K., Cauz, D., Chakraborty, R., Chang, S. P., Chapelain, A., Charity, S., Chislett, R., Choi, J., Chu, Z., Chupp, T. E., Conway, A., Corrodi, S., Cotrozzi, L., Crnkovic, J. D., Dabagov, S., Debevec, P. T., Di Falco, S., Di Meo, P., Di Sciascio, G., Di Stefano, R., Driutti, A., Duginov, V. N., Eads, M., Esquivel, J., Farooq, M., Fatemi, R., Ferrari, C., Fertl, M., Fienberg, A. T., Fioretti, A., Flay, D., Froemming, N. S., Gabbanini, C., Galati, M. D., Ganguly, S., Garcia, A., George, J., Gibbons, L. K., Gioiosa, A., Giovanetti, K. L., Girotti, P., Gohn, W., Gorringe, T., Grange, J., Grant, S., Gray, F., Haciomeroglu, S., Halewood-Leagas, T., Hampai, D., Han, F., Hempstead, J., Herrod, A. T., Hertzog, D. W., Hesketh, G., Hibbert, A., Hodge, Z., Holzbauer, J. L., Hong, K. W., Hong, R., Iacovacci, M., Incagli, M., Kammel, P., Kargiantoulakis, M., Karuza, M., Kaspar, J., Kawall, D., Kelton, L., Keshavarzi, A., Kessler, D., Khaw, K. S., Khechadoorian, Z., Khomutov, N. V., Kiburg, B., Kiburg, M., Kim, O., Kim, Y. I., King, B., Kinnaird, N., Kraegeloh, E., Kuchinskiy, N. A., Labe, K. R., Labounty, J., Lancaster, M., Lee, M. J., Lee, S., Li, B., Li, D., Li, L., Logashenko, I., Lorente Campos, A., Luca, A., Lukicov, G., Lusiani, A., Lyon, A. L., Maccoy, B., Madrak, R., Makino, K., Marignetti, F., Mastroianni, S., Miller, J. P., Miozzi, S., Morse, W. M., Mott, J., Nath, A., Nguyen, H., Osofsky, R., Park, S., Pauletta, G., Piacentino, G. M., Pilato, R. N., Pitts, K. T., Plaster, B., Pocanic, D., Pohlman, N., Polly, C. C., Price, J., Quinn, B., Raha, N., Ramachandran, S., Ramberg, E., Ritchie, J. L., Roberts, B. L., Rubin, D. L., Santi, L., Schlesier, C., Schreckenberger, A., Semertzidis, Y. K., Shemyakin, D., Smith, M. W., Sorbara, M., Stockinger, D., Stapleton, J., Stoughton, C., Stratakis, D., Stuttard, T., Swanson, H. E., Sweetmore, G., Sweigart, D. A., Syphers, M. J., Tarazona, D. A., Teubner, T., Tewsley-Booth, A. E., Thomson, K., Tishchenko, V., Tran, N. H., Turner, W., Valetov, E., Vasilkova, D., Venanzoni, G., Walton, T., Weisskopf, A., Welty-Rieger, L., Winter, P., Wolski, A., Wu, W., Baeßler, S., Lucà, A., Počanić, D., and Stöckinger, D.
Subjects: Field (physics), Physics::Instrumentation and Detectors, FOS: Physical sciences, 7. Clean energy, 01 natural sciences, Omega, High Energy Physics - Experiment, 010305 fluids & plasmas, Nuclear physics, High Energy Physics - Experiment (hep-ex), muon, 0103 physical sciences, Proton spin crisis, Fermilab, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Larmor precession, Physics, Muon, Settore FIS/01 - Fisica Sperimentale, VACUUM POLARIZATION CONTRIBUTIONSTEMPERATURE-DEPENDENCEPROTON NMRMOMENTSUSCEPTIBILITYTERMS, anomalous magnetic moment, Muon g-2 Experiment, anomalous precession frequency, Magnetic field, anomalous precession frequency, Muon g-2 Experiment, Fermi Gamma-ray Space Telescope
Abstract: The Fermi National Accelerator Laboratory has measured the anomalous precession frequency $a^{}_\mu = (g^{}_\mu-2)/2$ of the muon to a combined precision of 0.46 parts per million with data collected during its first physics run in 2018. This paper documents the measurement of the magnetic field in the muon storage ring. The magnetic field is monitored by nuclear magnetic resonance systems and calibrated in terms of the equivalent proton spin precession frequency in a spherical water sample at 34.7$^\circ$C. The measured field is weighted by the muon distribution resulting in $\tilde{\omega}'^{}_p$, the denominator in the ratio $\omega^{}_a$/$\tilde{\omega}'^{}_p$ that together with known fundamental constants yields $a^{}_\mu$. The reported uncertainty on $\tilde{\omega}'^{}_p$ for the Run-1 data set is 114 ppb consisting of uncertainty contributions from frequency extraction, calibration, mapping, tracking, and averaging of 56 ppb, and contributions from fast transient fields of 99 ppb., Comment: Added one citation and corrected missing normalization in Eqs (35) and (36)
Published: 2021
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5. Beam dynamics corrections to the Run-1 measurement of the muon anomalous magnetic moment at Fermilab

Author: K. S. Khaw, C. Schlesier, Diktys Stratakis, R. Fatemi, S. Corrodi, D. Newton, K. T. Pitts, R. T. Chislett, L. K. Gibbons, Kyoko Makino, E. Bottalico, A. Gioiosa, J. LaBounty, J. Bono, I. R. Bailey, P. Kammel, D. Kawall, T. J. V. Bowcock, H. P. Binney, W. Turner, A. T. Herrod, S. Miozzi, A. Schreckenberger, E. Valetov, N. H. Tran, K. W. Hong, J. Esquivel, M. Sorbara, Christopher Stoughton, Fabrizio Marignetti, A. Lucà, L. Kelton, M. Eads, D. Stöckinger, T. Barrett, G. Piacentino, J. Mott, S. Baeßler, Bck Casey, Kayleigh Anne Thomson, Giovanni Cantatore, Rachel Osofsky, M. Kiburg, E. Barlas-Yucel, Michael Syphers, C. C. Polly, J. Choi, R. Chakraborty, D. Flay, David Rubin, J. Grange, N. A. Kuchinskiy, M. W. Smith, G. Lukicov, M. Iacovacci, G. Pauletta, J. L. Ritchie, B. MacCoy, L. Cotrozzi, V. N. Duginov, A. Lorente Campos, S. Lee, Ran Hong, G. Sweetmore, D.A. Sweigart, M. Korostelev, Dongdong Li, D. W. Hertzog, Alexander Keshavarzi, G. Di Sciascio, Alejandro L. Garcia, Liang Li, F. Han, D. Sathyan, A.T. Fienberg, Sultan B. Dabagov, M. J. Lee, S. P. Chang, Benjamin T. King, Marin Karuza, R. N. Pilato, M. Incagli, J.B. Hempstead, B. Quinn, L. Santi, N. Kinnaird, F. Gray, P. Winter, L. Welty-Rieger, Meghna Bhattacharya, H. Nguyen, P. Di Meo, T. Stuttard, A. L. Lyon, David Kessler, A. Chapelain, J. Kaspar, B. Li, Galati, Sudeshna Ganguly, Andrzej Wolski, A. Driutti, D. A. Tarazona, Brad Plaster, R. M. Carey, D. Cauz, G. Venanzoni, J. Fry, B. Kiburg, J. P. Miller, W. Gohn, B. L. Roberts, S. Grant, V. A. Baranov, Nicholas A. Pohlman, N. V. Khomutov, M. Farooq, Jason Crnkovic, A. Hibbert, K. R. Labe, P. T. Debevec, Thomas Teubner, S. Di Falco, J. D. Price, Yi Kim, I.B. Logashenko, Yannis K. Semertzidis, K. L. Giovanetti, A. E. Tewsley-Booth, E. Frlež, Martin Berz, S. Charity, T. Walton, Z. Khechadoorian, S. Ramachandran, A. Fiedler, T. P. Gorringe, William Morse, A. Fioretti, A. Anastasi, O. Kim, A. Weisskopf, Wanwei Wu, Karie Badgley, S. Mastroianni, J. L. Holzbauer, Manolis Kargiantoulakis, S. Park, A. Lusiani, T. Albahri, R. Madrak, Selcuk Haciomeroglu, Z. Chu, Dariush Hampai, Gavin Grant Hesketh, J. George, Tishchenko, D. Vasilkova, Franco Bedeschi, P. Bloom, Timothy Chupp, P. Girotti, Nathan Froemming, J. Stapleton, Dinko Pocanic, M. Lancaster, C. Gabbanini, N. Raha, H. E. Swanson, Martin Fertl, Z. Hodge, Tabitha Halewood-leagas, E. J. Ramberg, A. Nath, R. Di Stefano, E. Kraegeloh, Claudio Ferrari, Albahri, T., Anastasi, A., Badgley, K., Baessler, S., Bailey, I., Baranov, V. A., Barlas-Yucel, E., Barrett, T., Bedeschi, F., Berz, M., Bhattacharya, M., Binney, H. P., Bloom, P., Bono, J., Bottalico, E., Bowcock, T., Cantatore, G., Carey, R. M., Casey, B. C. K., Cauz, D., Chakraborty, R., Chang, S. P., Chapelain, A., Charity, S., Chislett, R., Choi, J., Chu, Z., Chupp, T. E., Corrodi, S., Cotrozzi, L., Crnkovic, J. D., Dabagov, S., Debevec, P. T., Di Falco, S., Di Meo, P., Di Sciascio, G., Di Stefano, R., Driutti, A., Duginov, V. N., Eads, M., Esquivel, J., Farooq, M., Fatemi, R., Ferrari, C., Fertl, M., Fiedler, A., Fienberg, A. T., Fioretti, A., Flay, D., Frlez, E., Froemming, N. S., Fry, J., Gabbanini, C., Galati, M. D., Ganguly, S., Garcia, A., George, J., Gibbons, L. K., Gioiosa, A., Giovanetti, K. L., Girotti, P., Gohn, W., Gorringe, T., Grange, J., Grant, S., Gray, F., Haciomeroglu, S., Halewood-Leagas, T., Hampai, D., Han, F., Hempstead, J., Herrod, A. T., Hertzog, D. W., Hesketh, G., Hibbert, A., Hodge, Z., Holzbauer, J. L., Hong, K. W., Hong, R., Iacovacci, M., Incagli, M., Kammel, P., Kargiantoulakis, M., Karuza, M., Kaspar, J., Kawall, D., Kelton, L., Keshavarzi, A., Kessler, D., Khaw, K. S., Khechadoorian, Z., Khomutov, N. V., Kiburg, B., Kiburg, M., Kim, O., Kim, Y. I., King, B., Kinnaird, N., Korostelev, M., Kraegeloh, E., Kuchinskiy, N. A., Labe, K. R., Labounty, J., Lancaster, M., Lee, M. J., Lee, S., Li, B., Li, D., Li, L., Logashenko, I., Lorente Campos, A., Luca, A., Lukicov, G., Lusiani, A., Lyon, A. L., Maccoy, B., Madrak, R., Makino, K., Marignetti, F., Mastroianni, S., Miller, J. P., Miozzi, S., Morse, W. M., Mott, J., Nath, A., Newton, D., Nguyen, H., Osofsky, R., Park, S., Pauletta, G., Piacentino, G. M., Pilato, R. N., Pitts, K. T., Plaster, B., Pocanic, D., Pohlman, N., Polly, C. C., Price, J., Quinn, B., Raha, N., Ramachandran, S., Ramberg, E., Ritchie, J. L., Roberts, B. L., Rubin, D. L., Santi, L., Sathyan, D., Schlesier, C., Schreckenberger, A., Semertzidis, Y. K., Smith, M. W., Sorbara, M., Stockinger, D., Stapleton, J., Stoughton, C., Stratakis, D., Stuttard, T., Swanson, H. E., Sweetmore, G., Sweigart, D. A., Syphers, M. J., Tarazona, D. A., Teubner, T., Tewsley-Booth, A. E., Thomson, K., Tishchenko, V., Tran, N. H., Turner, W., Valetov, E., Vasilkova, D., Venanzoni, G., Walton, T., Weisskopf, A., Welty-Rieger, L., Winter, P., Wolski, A., and Wu, W.
Subjects: Larmor precession, Physics, Accelerator Physics (physics.acc-ph), Nuclear and High Energy Physics, Muon, Physics and Astronomy (miscellaneous), Anomalous magnetic dipole moment, 010308 nuclear & particles physics, FOS: Physical sciences, Surfaces and Interfaces, 01 natural sciences, High Energy Physics - Experiment, Magnetic field, Nuclear physics, High Energy Physics - Experiment (hep-ex), muon magnetic anomaly, 0103 physical sciences, Physics - Accelerator Physics, Fermilab, Pitch angle, 010306 general physics, G-2 EXPERIMENTFREQUENCY, Storage ring, Beam (structure)
Abstract: This paper presents the beam dynamics systematic corrections and their uncertainties for the Run-1 data set of the Fermilab Muon g-2 Experiment. Two corrections to the measured muon precession frequency $\omega_a^m$ are associated with well-known effects owing to the use of electrostatic quadrupole (ESQ) vertical focusing in the storage ring. An average vertically oriented motional magnetic field is felt by relativistic muons passing transversely through the radial electric field components created by the ESQ system. The correction depends on the stored momentum distribution and the tunes of the ring, which has relatively weak vertical focusing. Vertical betatron motions imply that the muons do not orbit the ring in a plane exactly orthogonal to the vertical magnetic field direction. A correction is necessary to account for an average pitch angle associated with their trajectories. A third small correction is necessary because muons that escape the ring during the storage time are slightly biased in initial spin phase compared to the parent distribution. Finally, because two high-voltage resistors in the ESQ network had longer than designed RC time constants, the vertical and horizontal centroids and envelopes of the stored muon beam drifted slightly, but coherently, during each storage ring fill. This led to the discovery of an important phase-acceptance relationship that requires a correction. The sum of the corrections to $\omega_a^m$ is 0.50 $\pm$ 0.09 ppm; the uncertainty is small compared to the 0.43 ppm statistical precision of $\omega_a^m$., Comment: 35 pages, 29 figures. Accepted by Phys. Rev. Accel. Beams
Published: 2021
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6. First Precision Measurement of the Parity Violating Asymmetry in Cold Neutron Capture on He3

Author: J. Watts, E. Plemons, Erik B. Iverson, mmultiscripts, Seppo Penttila, E. M. Scott, J. D. Bowman, M. McCrea, G. L. Greene, C. Wickersham, M. L. Kabir, S. Baeßler, Ivan Novikov, mrow, N. Birge, Nadia Fomin, J. R. Calarco, A. Ramírez-Morales, C. Hayes, P. E. Mueller, I. Garishvili, mi> He, C. E. Coppola, Christopher Crawford, J. Hamblen, G. M. Hale, L. Barrón-Palos, mprescripts, V. Cianciolo, and Michael Gericke
Subjects: Physics, Particle physics, media_common.quotation_subject, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Electroweak interaction, General Physics and Astronomy, Parity (physics), Weak interaction, 01 natural sciences, Asymmetry, 0103 physical sciences, Effective field theory, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Nucleon, media_common
Abstract: We report the first precision measurement of the parity-violating asymmetry in the direction of proton momentum with respect to the neutron spin, in the reaction ^{3}He(n,p)^{3}H, using the capture of polarized cold neutrons in an unpolarized active ^{3}He target. The asymmetry is a result of the weak interaction between nucleons, which remains one of the least well-understood aspects of electroweak theory. The measurement provides an important benchmark for modern effective field theory and potential model calculations. Measurements like this are necessary to determine the spin-isospin structure of the hadronic weak interaction. Our asymmetry result is A_{PV}=[1.55±0.97(stat)±0.24(sys)]×10^{-8}, which has the smallest uncertainty of any hadronic parity-violating asymmetry measurement so far.
Published: 2020

7. Improved determination of the β−ν¯e angular correlation coefficient a in free neutron decay with the aSPECT spectrometer

Author: Gertrud Konrad, F. Ayala Guardia, R. Virot, Werner Heil, Michael Klopf, R. Maisonobe, J. Kahlenberg, Ulrich Schmidt, M. Borg, C. Schmidt, Ferenc Glück, Marcus Beck, A. Wunderle, R. Muñoz Horta, O. Zimmer, M. Simson, T. Soldner, and S. Baeßler
Subjects: Physics, Coupling constant, Spectrometer, 010308 nuclear & particles physics, Spectrum (functional analysis), Lambda, 01 natural sciences, Collimated light, Filter (large eddy simulation), 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Adiabatic process
Abstract: We report on a precise measurement of the electron-antineutrino angular correlation ($a$ coefficient) in free neutron beta-decay from the $a$SPECT experiment. The $a$ coefficient is inferred from the recoil energy spectrum of the protons which are detected in 4$\pi$ by the $a$SPECT spectrometer using magnetic adiabatic collimation with an electrostatic filter. Data are presented from a 100 days run at the Institut Laue Langevin in 2013. The sources of systematic errors are considered and included in the final result. We obtain $a = -0.10430(84)$ which is the most precise measurement of the neutron $a$ coefficient to date. From this, the ratio of axial-vector to vector coupling constants is derived giving $|\lambda| = 1.2677(28)$.
Published: 2020

8. First Precision Measurement of the Parity Violating Asymmetry in Cold Neutron Capture on ^{3}He

Author: M T, Gericke, S, Baeßler, L, Barrón-Palos, N, Birge, J D, Bowman, J, Calarco, V, Cianciolo, C E, Coppola, C B, Crawford, N, Fomin, I, Garishvili, G L, Greene, G M, Hale, J, Hamblen, C, Hayes, E, Iverson, M L, Kabir, M, McCrea, E, Plemons, A, Ramírez-Morales, P E, Mueller, I, Novikov, S, Penttila, E M, Scott, J, Watts, and C, Wickersham
Abstract: We report the first precision measurement of the parity-violating asymmetry in the direction of proton momentum with respect to the neutron spin, in the reaction ^{3}He(n,p)^{3}H, using the capture of polarized cold neutrons in an unpolarized active ^{3}He target. The asymmetry is a result of the weak interaction between nucleons, which remains one of the least well-understood aspects of electroweak theory. The measurement provides an important benchmark for modern effective field theory and potential model calculations. Measurements like this are necessary to determine the spin-isospin structure of the hadronic weak interaction. Our asymmetry result is A_{PV}=[1.55±0.97(stat)±0.24(sys)]×10^{-8}, which has the smallest uncertainty of any hadronic parity-violating asymmetry measurement so far.
Published: 2020

9. Using Nab to determine correlations in unpolarized neutron decay

Author: A. P. Jezghani, D. E. Fellers, P. L. McGaughey, E. Frlež, R. Mammei, C. A. Royse, H. Li, John Ramsey, J. Wexler, Mark Makela, L. Hayen, T. Bailey, R. Whitehead, Christopher Crawford, Natalis Severijns, Albert Young, Michael Gericke, S. Baeßler, Dinko Pocanic, A. Salas-Bacci, J. D. Bowman, Nadia Fomin, C. Cude-Woods, P. E. Mueller, S. K. L. Sjue, N. Birge, N. Macsai, B. A. Zeck, D. Mathews, Leah Broussard, and E. Smith
Subjects: Coupling constant, Physics, Nuclear and High Energy Physics, Particle physics, Physics - Instrumentation and Detectors, Proton, 010308 nuclear & particles physics, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Electron, Condensed Matter Physics, Lambda, 01 natural sciences, Beta decay, Atomic and Molecular Physics, and Optics, Time of flight, 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), Physical and Theoretical Chemistry, 010306 general physics, Nuclear Experiment, Energy (signal processing)
Abstract: The Nab experiment will measure the ratio of the weak axial-vector and vector coupling constants $\lambda=g_A/g_V$ with precision $\delta\lambda/\lambda\sim3\times10^{-4}$ and search for a Fierz term $b_F$ at a level $\Delta b_F, Comment: Proceedings of the 7th International Syposium on Symmetries in Subatomic Physics SSP2018, Aachen (Germany), 10 - 15 Jun 2018. This is a pre-print of an article published in Hyperfine Interactions. The final authenticated version is available online at: https://doi.org/10.1007/s10751-018-1538-7
Published: 2019

10. First Observation of P -odd γ Asymmetry in Polarized Neutron Capture on Hydrogen

Author: J. R. Calarco, C. Hayes, Dinko Pocanic, J. Hall, Charles Fieseler, V. Cianciolo, Xin Tong, S. Baeßler, S. Schröder, A. Ramírez-Morales, S. Santra, R. Whitehead, K. Craycraft, Kyle B. Grammer, E. Askanazi, P. N. Seo, S. Balascuta, Erik B. Iverson, A. Sprow, R. Mahurin, Ivan Novikov, J. Stewart, M. Musgrave, E. Frlež, N. Birge, Nadia Fomin, L. Alonzi, A. Salas-Bacci, I. Garishvili, W. M. Snow, Bernhard Lauss, S. Kucuker, W. S. Wilburn, M. Root, Timothy Chupp, D. Evans, Geoffrey Greene, Yasuhiro Masuda, Ricardo Alarcon, F. Simmons, H. Nann, M. Maldonado-Velázquez, M. L. Kabir, E. M. Scott, Robert Milburn, R. C. Gillis, J. D. Bowman, C. E. Coppola, M. McCrea, E. Tang, E. I. Sharapov, Michael Gericke, J. Fry, Christopher Crawford, S. I. Penttilä, D. Blyth, J. Hamblen, P. E. Mueller, Alexander Barzilov, L. Barrón-Palos, Z. Tang, J. Mei, D. Parsons, and D. J. Turkoglu
Subjects: Coupling constant, Physics, Meson, 010308 nuclear & particles physics, media_common.quotation_subject, General Physics and Astronomy, Spin isomers of hydrogen, Coupling (probability), 01 natural sciences, Asymmetry, Pion, 0103 physical sciences, Effective field theory, Neutron, Atomic physics, 010306 general physics, media_common
Abstract: We report the first observation of the parity-violating gamma-ray asymmetry A_{γ}^{np} in neutron-proton capture using polarized cold neutrons incident on a liquid parahydrogen target at the Spallation Neutron Source at Oak Ridge National Laboratory. A_{γ}^{np} isolates the ΔI=1, ^{3}S_{1}→^{3}P_{1} component of the weak nucleon-nucleon interaction, which is dominated by pion exchange and can be directly related to a single coupling constant in either the DDH meson exchange model or pionless effective field theory. We measured A_{γ}^{np}=[-3.0±1.4(stat)±0.2(syst)]×10^{-8}, which implies a DDH weak πNN coupling of h_{π}^{1}=[2.6±1.2(stat)±0.2(syst)]×10^{-7} and a pionless EFT constant of C^{^{3}S_{1}→^{3}P_{1}}/C_{0}=[-7.4±3.5(stat)±0.5(syst)]×10^{-11} MeV^{-1}. We describe the experiment, data analysis, systematic uncertainties, and implications of the result.
Published: 2018

11. First Observation of P-odd γ Asymmetry in Polarized Neutron Capture on Hydrogen

Author: D, Blyth, J, Fry, N, Fomin, R, Alarcon, L, Alonzi, E, Askanazi, S, Baeßler, S, Balascuta, L, Barrón-Palos, A, Barzilov, J D, Bowman, N, Birge, J R, Calarco, T E, Chupp, V, Cianciolo, C E, Coppola, C B, Crawford, K, Craycraft, D, Evans, C, Fieseler, E, Frlež, I, Garishvili, M T W, Gericke, R C, Gillis, K B, Grammer, G L, Greene, J, Hall, J, Hamblen, C, Hayes, E B, Iverson, M L, Kabir, S, Kucuker, B, Lauss, R, Mahurin, M, McCrea, M, Maldonado-Velázquez, Y, Masuda, J, Mei, R, Milburn, P E, Mueller, M, Musgrave, H, Nann, I, Novikov, D, Parsons, S I, Penttilä, D, Počanić, A, Ramirez-Morales, M, Root, A, Salas-Bacci, S, Santra, S, Schröder, E, Scott, P-N, Seo, E I, Sharapov, F, Simmons, W M, Snow, A, Sprow, J, Stewart, E, Tang, Z, Tang, X, Tong, D J, Turkoglu, R, Whitehead, and W S, Wilburn
Abstract: We report the first observation of the parity-violating gamma-ray asymmetry A_{γ}^{np} in neutron-proton capture using polarized cold neutrons incident on a liquid parahydrogen target at the Spallation Neutron Source at Oak Ridge National Laboratory. A_{γ}^{np} isolates the ΔI=1, ^{3}S_{1}→^{3}P_{1} component of the weak nucleon-nucleon interaction, which is dominated by pion exchange and can be directly related to a single coupling constant in either the DDH meson exchange model or pionless effective field theory. We measured A_{γ}^{np}=[-3.0±1.4(stat)±0.2(syst)]×10^{-8}, which implies a DDH weak πNN coupling of h_{π}^{1}=[2.6±1.2(stat)±0.2(syst)]×10^{-7} and a pionless EFT constant of C^{^{3}S_{1}→^{3}P_{1}}/C_{0}=[-7.4±3.5(stat)±0.5(syst)]×10^{-11} MeV^{-1}. We describe the experiment, data analysis, systematic uncertainties, and implications of the result.
Published: 2018

12. A new cryogenic apparatus to search for the neutron electric dipole moment

Author: R. J. Holt, Seppo Penttila, S. Baessler, David G. Haase, C. R. Gould, M. E. Hayden, Dipangkar Dutta, S. W. T. MacDonald, L. Barrón-Palos, E. Korobkina, R. P. Redwine, Jen-Chieh Peng, Marcus H. Mendenhall, J. Long, Z. Tang, Haiyan Gao, Steven Clayton, Ross Milner, Evgeni Tsentalovich, J. Kelsey, Robert Golub, E. Ihloff, C. Vidal, S. E. Williamson, Matthew Busch, A. T. Holley, George M. Seidel, A. Saftah, M. Behzadipour, B. W. Filippone, M. Makela, Ayman I. Hawari, I. Berkutov, C. Osthelder, C. Daurer, Ricardo Alarcon, W. Yao, A. Reid, M. Broering, C. Swank, P. R. Huffman, S. Slutsky, Musa Ahmed, J. Leggett, Liang Yang, John Ramsey, Yu. Efremenko, H. O. Meyer, M. Blatnik, R. Carr, James Maxwell, T. D. S. Stanislaus, Scott Currie, E. S. Smith, W. M. Snow, A. Lipman, Takeyasu M. Ito, N. S. Phan, A. Aleksandrova, Leah Broussard, C.-Y. Liu, X. Sun, Steve K. Lamoreaux, K. A. Dow, Nima Nouri, D. P. Kendellen, A. Matlashov, R. Dipert, L. M. Bartoszek, K. K. H. Leung, C. O'Shaughnessy, M. Karcz, C. B. Erickson, Yongsun Kim, Wanchun Wei, A. R. Young, S. K. Imam, J. Bessuille, Geoffrey Greene, R. Tavakoli Dinani, T. M. Rao, S. Sosothikul, Douglas H Beck, D. Hasell, Wolfgang Korsch, P. E. Mueller, I.F. Silvera, C. R. White, M. D. Cooper, Christopher Crawford, Nadia Fomin, W. E. Sondheim, Brad Plaster, and V. Cianciolo
Subjects: Physics, Physics - Instrumentation and Detectors, Neutron electric dipole moment, 010308 nuclear & particles physics, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Oak Ridge National Laboratory, 01 natural sciences, 030218 nuclear medicine & medical imaging, Superfluidity, Nuclear physics, 03 medical and health sciences, 0302 clinical medicine, Electric field, 0103 physical sciences, Limit (music), Neutron, Sensitivity (control systems), Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation, Mathematical Physics, Spallation Neutron Source
Abstract: © 2019 IOP Publishing Ltd and Sissa Medialab. A cryogenic apparatus is described that enables a new experiment, nEDM@SNS, with a major improvement in sensitivity compared to the existing limit in the search for a neutron Electric Dipole Moment (EDM). This apparatus uses superfluid 4He to produce a high density of Ultra-Cold Neutrons (UCN) which are contained in a suitably coated pair of measurement cells. The experiment, to be operated at the Spallation Neutron Source at Oak Ridge National Laboratory, uses polarized 3He from an Atomic Beam Source injected into the superfluid 4He and transported to the measurement cells where it serves as a co-magnetometer. The superfluid 4He is also used as an insulating medium allowing significantly higher electric fields, compared to previous experiments, to be maintained across the measurement cells. These features provide an ultimate statistical uncertainty for the EDM of 2-3× 10-28 e-cm, with anticipated systematic uncertainties below this level.
Published: 2019

13. Measurement of the absolute neutron beam polarization from a supermirror polarizer and the absolute efficiency of a neutron spin rotator for the NPDGamma experiment using a polarized $^{3}$He neutron spin-filter

Author: S. Balascuta, P. R. Huffman, P. E. Mueller, M.M. Musgrave, D. Blyth, W. M. Snow, V. Cianciolo, Nadia Fomin, Geoffrey Greene, J. D. Bowman, Christopher Crawford, C. Hayes, M. McCrea, E. Tang, J. Hamblen, L. Barrón-Palos, K. Craycraft, Zhaowen Tang, Kyle B. Grammer, S. Kucuker, W. S. Wilburn, Chenyang Jiang, Xin Tong, S. Baeßler, R. C. Gillis, Seppo Penttila, Timothy Chupp, Michael Gericke, and J. Fry
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Physics, 010308 nuclear & particles physics, Instrumentation and Detectors (physics.ins-det), Polarizer, Neutron radiation, 3. Good health, Neutron capture, Beamline, Neutron source, Physics::Accelerator Physics, Spallation Neutron Source, Beam (structure)
Abstract: Accurately measuring the neutron beam polarization of a high flux, large area neutron beam is necessary for many neutron physics experiments. The Fundamental Neutron Physics Beamline (FnPB) at the Spallation Neutron Source (SNS) is a pulsed neutron beam that was polarized with a supermirror polarizer for the NPDGamma experiment. The polarized neutron beam had a flux of $\sim10^9$ neutrons per second per cm$^2$ and a cross sectional area of 10$\times$12~cm$^2$. The polarization of this neutron beam and the efficiency of a RF neutron spin rotator installed downstream on this beam were measured by neutron transmission through a polarized $^{3}$He neutron spin-filter. The pulsed nature of the SNS enabled us to employ an absolute measurement technique for both quantities which does not depend on accurate knowledge of the phase space of the neutron beam or the $^{3}$He polarization in the spin filter and is therefore of interest for any experiments on slow neutron beams from pulsed neutron sources which require knowledge of the absolute value of the neutron polarization. The polarization and spin-reversal efficiency measured in this work were done for the NPDGamma experiment, which measures the parity violating $\gamma$-ray angular distribution asymmetry with respect to the neutron spin direction in the capture of polarized neutrons on protons. The experimental technique, results, systematic effects, and applications to neutron capture targets are discussed., Comment: 13 pages, 14 figures, 2 tables
Published: 2018

14. Detection system for neutron β decay correlations in the UCNB and Nab experiments

Author: D. J. Salvat, Christopher Morris, E. B. Dees, Wanchun Wei, J. Burkhart, C.-Y. Liu, John Ramsey, Seppo Penttila, W. S. Wilburn, S. J. Seestrom, Hui Li, J. Mirabal-Martinez, Dinko Pocanic, X. Ding, Sky Sjue, Syed Hamid Hasan, Albert Young, S. Baeßler, C. Cude-Woods, Takeyasu M. Ito, B. A. Zeck, A.P. Sprow, J.D. Ortiz, Zhehui Wang, Nadia Fomin, J. Hoagland, A. Klein, N. B. Callahan, Mark Makela, P. L. McGaughey, Scott Currie, B. VornDick, E. Adamek, Steven Clayton, J. Fry, Z. Tang, J. Wexler, A. T. Holley, Frederick Gray, B. Plaster, Robert W. Pattie, R. B. Vogelaar, A. Salas-Bacci, T. L. Womack, Leah Broussard, M. Blatnik, J. D. Bowman, Emil Frlez, N. Birge, Christopher Crawford, Kevin Hickerson, Aaron Brandt, M. A. P. Brown, and Alexander Saunders
Subjects: Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Silicon, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, chemistry.chemical_element, Electron, 7. Clean energy, 01 natural sciences, 3. Good health, Nuclear physics, Recoil, chemistry, 0103 physical sciences, Neutron cross section, Ultracold neutrons, Neutron detection, Neutron, 010306 general physics, Nuclear Experiment, Instrumentation
Abstract: We describe a detection system designed for precise measurements of angular correlations in neutron $\beta$ 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 $\beta$ electron detection with energy thresholds below 10 keV, energy resolution of $\sim$3 keV FWHM, and rise time of $\sim$50 ns with 19 of the 127 detector pixels instrumented. Using ultracold neutrons at the Los Alamos Neutron Science Center, we have demonstrated the coincident detection of $\beta$ particles and recoil protons from neutron $\beta$ decay. The fully instrumented detection system will be implemented in the UCNB and Nab experiments, to determine the neutron $\beta$ decay parameters $B$, $a$, and $b$., Comment: Copyright 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Published: 2017

15. Status of the NPDGamma experiment

Author: C. Garcia, E. Frlež, E. Askanazi, S. Balascuta, Dinko Pocanic, D. Evans, P. N. Seo, H. Nann, Kyle B. Grammer, M. Musgrave, Gregory S. Mitchell, Bernhard Lauss, R. Mahurin, D. Blyth, F. Simmons, Geoffrey Greene, V.W. Yuan, E. Tang, L. Kabir, S. A. Page, J. R. Calarco, Ricardo Alarcon, C. Hayes, Timothy Chupp, Yi-De Zhang, T. Tong, Erik B. Iverson, C. E. Coppola, L. Barrón-Palos, Alexander Barzilov, W. Fox, Charles Fieseler, I. Garishvili, K. Craycraft, J. Stuart, F. W. Hersman, Y. Li, Z. Tang, M. Sharma, R. Allen, Christopher Crawford, J. Vanderwerp, Gordon L. Jones, P. E. Mueller, J. Hamblen, Yasuhiro Masuda, S. I. Penttilä, Robert Milburn, S. Baeßler, A. Salas-Bacci, C. Fu, D. Parsons, Ivan Novikov, E. I. Sharapov, Takashi Ino, Nadia Fomin, S. Kucucker, Stuart J. Freedman, J. Thomison, W. D. Ramsay, Michael Gericke, C. Blessinger, M. Maldonado-Velázquez, J. Fry, M. Dabaghyan, R. C. Gillis, M. McCrea, S. Waldecker, J. Mei, T. B. Smith, J. D. Bowman, S. Santra, Suguru Muto, W. M. Snow, W. Xu, W. S. Wilburn, and J. Favela
Subjects: Nuclear and High Energy Physics, Particle physics, Meson, media_common.quotation_subject, Nuclear Theory, Hadron, Weak interaction, 01 natural sciences, 7. Clean energy, Asymmetry, Nuclear physics, 0103 physical sciences, Neutron, Physical and Theoretical Chemistry, Nuclear Experiment, 010306 general physics, media_common, Physics, 010308 nuclear & particles physics, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Neutron capture, Physics::Accelerator Physics, High Energy Physics::Experiment, Nucleon, Spallation Neutron Source
Abstract: The NPDGamma experiment measures the parity-violating (PV) gamma asymmetry from polarized cold neutrons captured on protons at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). The (PV) neutron spin asymmetry A γ of photons from polarized cold neutron capture on protons is proportional to the ΔI=1 long range weak meson coupling $h_{\pi }^{1}$ between nucleons in the hadronic weak interaction (HWI). Liquid para-hydrogen production data taking concluded in April 2014 and once the background aluminum asymmetry measurements are complete, the PV asymmetry A γ can be extracted. Preliminary results of the analysis of A γ are presented.
Published: 2016

16. The neutron electric dipole moment experiment at the Spallation Neutron Source

Author: Scott Currie, John Ramsey, Haiyan Gao, Dipangkar Dutta, Jen-Chieh Peng, Y.J. Kim, A. Lipman, A. Matlashov, E. Ihloff, M. Blatnik, E. Korobkina, M. McCrea, P. R. Huffman, C. R. Gould, C. M. O'Shaughnessy, Brad Plaster, D. Hasell, T. Rao, Mark Makela, T. D. S. Stanislaus, Wanchun Wei, C. B. Erickson, S. Baeßler, Nima Nouri, M. E. Hayden, Liang Yang, M. Broering, Ayman I. Hawari, S. Sosothikul, Yu. Efremenko, S. E. Williamson, P. E. Mueller, L. M. Bartoszek, K. K. H. Leung, A. R. Young, L. Barrón-Palos, Seppo Penttila, J. Bessuille, Geoffrey Greene, Steve K. Lamoreaux, K. A. Dow, S. W. T. MacDonald, Leah Broussard, Douglas H Beck, M. Behzadipour, Ricardo Alarcon, W. Yao, S. Slutsky, Christopher Crawford, A. Aleksandrova, R. Tavakoli Dinani, David G. Haase, Evgeni Tsentalovich, R. J. Holt, Z. Tang, R. P. Redwine, J. Kelsey, Matthew Busch, E. Leggett, A. Saftah, Steven Clayton, Ross Milner, M. W. Ahmed, Nadia Fomin, C. Vidal, Wolfgang Korsch, V. Cianciolo, E. Smith, I.F. Silvera, C. R. White, Marcus H. Mendenhall, J. Long, R. Dipert, Robert Golub, A. T. Holley, C. Osthelder, R. Carr, W. M. Snow, George M. Seidel, B. W. Filippone, W. E. Sondheim, Takeyasu M. Ito, N. S. Phan, C. Daurer, M. D. Cooper, A. Reid, C. Swank, James Maxwell, X. Sun, Pinghan Chu, H. O. Meyer, and C.-Y. Liu
Subjects: Physics, Physics - Instrumentation and Detectors, Neutron electric dipole moment, 010308 nuclear & particles physics, QC1-999, FOS: Physical sciences, Field strength, Instrumentation and Detectors (physics.ins-det), 7. Clean energy, 01 natural sciences, Nuclear physics, Electric field, 0103 physical sciences, Electromagnetic shielding, Precession, Ultracold neutrons, Nuclear Experiment (nucl-ex), 010306 general physics, Spin (physics), Nuclear Experiment, Spallation Neutron Source
Abstract: Novel experimental techniques are required to make the next big leap in neutron electric dipole moment experimental sensitivity, both in terms of statistics and systematic error control. The nEDM experiment at the Spallation Neutron Source (nEDM@SNS) will implement the scheme of Golub & Lamoreaux [Phys. Rep., 237, 1 (1994)]. The unique properties of combining polarized ultracold neutrons, polarized $^3$He, and superfluid $^4$He will be exploited to provide a sensitivity to $\sim 10^{-28}\,e{\rm \,\cdot\, cm}$. Our cryogenic apparatus will deploy two small ($3\,{\rm L}$) measurement cells with a high density of ultracold neutrons produced and spin analyzed in situ. The electric field strength, precession time, magnetic shielding, and detected UCN number will all be enhanced compared to previous room temperature Ramsey measurements. Our $^3$He co-magnetometer offers unique control of systematic effects, in particular the Bloch-Siegert induced false EDM. Furthermore, there will be two distinct measurement modes: free precession and dressed spin. This will provide an important self-check of our results. Following five years of "critical component demonstration," our collaboration transitioned to a "large scale integration" phase in 2018. An overview of our measurement techniques, experimental design, and brief updates are described in these proceedings., Submitted to proceedings of PPNS 2018 - International Workshop on Particle physics at Neutron Sources (https://www.webofconferences.org/epj-web-of-conferences-forthcoming-conferences/1148-ppns-2018)
Published: 2019

17. The Nab experiment: A precision measurement of unpolarized neutron beta decay

Author: Timothy Chupp, S. Samiei, C. Hendrus, E. Frlež, D. van Petten, P. E. Mueller, K. P. Rykaczewski, J. Wexler, N. Macsai, B. A. Zeck, W. Farrar, A. T. Bryant, Leah Broussard, T. Bailey, Robert Grzywacz, R. Mammei, S. Balascuta, M. Doyle, T. Shelton, R. Picker, Christopher Crawford, Wenjiang Fan, Seppo Penttila, C. Hayes, E. Smith, M. McCrea, W. S. Wilburn, K. Bass, D. Borissenko, J. Pierce, G. Randall, Juliette Mammei, Ricardo Alarcon, R. Whitehead, A. Smith, K. Chang, Sky Sjue, Michael Gericke, C. D. McLaughlin, G. Riley, P. L. McGaughey, J. D. Bowman, J. Caylor, Mark Makela, Vladimir Gudkov, Nadia Fomin, E. M. Scott, A. Salas-Bacci, M. Martinez, J. Byrne, T. V. Cianciolo, J. Fry, J.R. Calarco, L. Barrón Palos, Dinko Pocanic, F. Glück, D. E. Perryman, Geoffrey Greene, A. P. Jezghani, M. Gervais, A. Blose, D.G. Matthews, Y. Qian, Hui Li, N. Birge, Eric Stevens, X. Ding, Takeyasu M. Ito, J. Ramsey, J. Hamblen, Albert Young, and S. Baeßler
Subjects: Physics, Proton, Spectrometer, 010308 nuclear & particles physics, QC1-999, Nuclear Theory, FOS: Physical sciences, Electron, Weak interaction, 01 natural sciences, Beta decay, Nuclear physics, Time of flight, 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Spallation Neutron Source
Abstract: Neutron beta decay is one of the most fundamental processes in nuclear physics and provides sensitive means to uncover the details of the weak interaction. Neutron beta decay can evaluate the ratio of axial-vector to vector coupling constants in the standard model, $\lambda = g_A / g_V$, through multiple decay correlations. The Nab experiment will carry out measurements of the electron-neutrino correlation parameter $a$ with a precision of $\delta a / a = 10^{-3}$ and the Fierz interference term $b$ to $\delta b = 3\times10^{-3}$ in unpolarized free neutron beta decay. These results, along with a more precise measurement of the neutron lifetime, aim to deliver an independent determination of the ratio $\lambda$ with a precision of $\delta \lambda / \lambda = 0.03\%$ that will allow an evaluation of $V_{ud}$ and sensitively test CKM unitarity, independent of nuclear models. Nab utilizes a novel, long asymmetric spectrometer that guides the decay electron and proton to two large area silicon detectors in order to precisely determine the electron energy and an estimation of the proton momentum from the proton time of flight. The Nab spectrometer is being commissioned at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source at Oak Ridge National Lab. We present an overview of the Nab experiment and recent updates on the spectrometer, analysis, and systematic effects., Comment: Presented at PPNS2018
Published: 2019

18. A storage ring experiment to detect a proton electric dipole moment

Author: D. Kawall, Kyoko Makino, S. T. Park, Eric M. Metodiev, M. Bai, Andreas Lehrach, M. Grosse-Perdekamp, P. Fierlinger, A. Pesce, D. Moricciani, W. Meng, J. Talman, T. Roser, Andrew Ivanov, A.U. Luccio, Richard Talman, G. Venanzoni, M. Incagli, G. Guidoboni, J. Benante, Francois Méot, Konstantin Zioutas, Wolfram Fischer, Y. Giomataris, G. Fanourakis, Vadim Ptitsyn, S. Rescia, A. Sidorin, Jason Crnkovic, B. King, Michael Syphers, Selcuk Haciomeroglu, Richard Baartman, N. Tsoupas, B. I. Khazin, Yannis K. Semertzidis, Martin Berz, Yong-Ho Lee, Y. Senichev, G. Zavattini, Kevin Brown, J. Pretz, V. Tishchenko, T. J. V. Bowcock, S. K. Nayak, E. J. Stephenson, Ivan Koop, W.W. MacKay, Yuri F. Orlov, Alexey Lyapin, B. C. K. Casey, M. Blaskiewicz, C. Touramanis, A. N. Zelenski, R. Maier, M. Conte, Valeri Lebedev, G. Hoffstaetter, S. Baessler, E. Won, C. S. Özben, K. Vetter, Frank Rathmann, A. V. Fedotov, D. Raparia, A. Stahl, H. Huang, P. Pile, M. J. Lee, M. Gaisser, Shyh Yuan Lee, William J. Marciano, William Morse, B. Podobedov, D. M. Lazarus, P. Levi Sandri, Rasmus Larsen, Alexander J. Silenko, H. Kamal Sayed, Serge Andrianov, L. Miceli, N. Malitsky, P. Lenisa, Nikolaos Simos, H. Stroeher, S. Nagaitsev, S. Vlassis, Vassilis Anastassopoulos, E. J. Ramberg, Y. I. Kim, and V. Polychronakos
Subjects: Systematic error, Accelerator Physics (physics.acc-ph), Proton, Physics beyond the Standard Model, FOS: Physical sciences, p: electric moment, momentum, 01 natural sciences, High Energy Physics - Experiment, NO, Nuclear physics, Polarisation, Storage Rings, Fundamental Symmetries, Physics beyond Standard Model, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, ddc:530, 010306 general physics, Instrumentation, Fundamental Symmetries, Polarisation, Physics, polarization, 010308 nuclear & particles physics, new physics, Magic (programming), Physics beyond Standard Model, storage ring, sensitivity, Electric dipole moment, electric moment [p], Storage Rings, Physics - Accelerator Physics, Storage ring, dipole, experimental results
Abstract: A new experiment is described to detect a permanent electric dipole moment of the proton with a sensitivity of $10^{-29}e\cdot$cm by using polarized "magic" momentum $0.7$~GeV/c protons in an all-electric storage ring. Systematic errors relevant to the experiment are discussed and techniques to address them are presented. The measurement is sensitive to new physics beyond the Standard Model at the scale of 3000~TeV., Comment: 8 pages, 3 figures
Published: 2016
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19. First measurements with the neutron decay spectrometer a SPECT

Author: I. Konorov, S. Baeßler, M. Borg, Ferenc Glück, Yu. Sobolev, F. Ayala Guardia, Werner Heil, Gertrud Konrad, G. Petzoldt, H.-F. Wirth, R. Muñoz Horta, M. Simson, O. Zimmer, and Dennis Rich
Subjects: Physics, Massless particle, Nuclear physics, Nuclear and High Energy Physics, Proton, Spectrometer, Elementary particle, Neutron, Electron, Neutrino, Beam (structure)
Abstract: The neutron decay spectrometera SPECT has been built to perform a precise measurement of the proton spectrum shape in the decay of free neutrons. Such a measurement allows a determination of the neutrino electron angular-correlation coefficienta . The present best experiments have an uncertainty of Δa/a = 5% and since the seventies there is no substantial improvement. Witha SPECT, we aim for an uncertainty which is lower by more than an order of magnitude, thus enabling us to perform several precise tests of the Standard Model. In our first beam time at the particle physics beam MEPHISTO at the Forschungsneutronenquelle Heinz Maier-Leibnitz, we studied the properties of the spectrometer. The most serious problem turned out to be the situation- and time-dependent behavior of the background. From the data sets from this beam time in which a background problem was not obvious, we could extract a value ofa = - 0.1151±0.0040stat , but we could not quantify the background uncertainty. We show ways to deal with the background and other problems for future beam times.
Published: 2008

20. The Measurement of the Anomalous Magnetic Moment of the Muon at Fermilab

Author: R. Chislett, J. Carroll, D. Cauz, Andrew Smith, M. Lee, A. Anastasi, E. Hazen, M. Eads, G. Pauletta, R. Osofsky, B. Quinn, R. Fatemi, I. Logashenko, S. Baessler, D.A. Sweigart, N. A. Kuchinskiy, M. W. Smith, D. Still, Yannis K. Semertzidis, W. Gohn, K. L. Giovanetti, V. Tishchenko, L. Welty-Rieger, R. Di Stefano, C. Fu, M. Iacovacci, E. Barzi, V. Volnykh, J. F. Ostiguy, D. W. Hertzog, T. Stuttard, V. A. Baranov, C. J. G. Onderwater, Michael Syphers, G. Luo, V. P. Druzhinin, E. Won, P. T. Debevec, C. Yoshikawa, J. Grange, Martin Fertl, Stephen Maxfield, F. Azfar, A. Epps, L Li, P. Winter, C. Johnstone, A. Fioretti, B. Drendel, K. T. Pitts, M R M Warren, L. K. Gibbons, D. Stöckinger, M. Whitley, Donald B. Rubin, M. Rominsky, J. Crnkovic, T. P. Gorringe, T. Walton, C. Ferrari, Z. Meadows, G. Venanzoni, Thomas Teubner, Nicholas A. Pohlman, S. Haciomeroglu, M. Gaisser, M. Wormald, B. Casey, Frederick Gray, H. Freidsam, Marin Karuza, K. R. Lynch, P. Kammel, S. Henry, S.B. Dabagov, A. L. Lyon, C. Schlesier, E. Motuk, Yuri F. Orlov, D. Allspach, N. Rider, T. J. V. Bowcock, B. Abi, N. Kinnaird, D. Babusci, A. Para, R. M. Carey, A. de Gouvea, J. Johnstone, J. P. Miller, S. Lee, A.T. Fienberg, G. Di Sciascio, Y. Kim, H. Schellman, L.P. Alonzi, H Yang, H. Kamal Sayed, B. L. Roberts, Edward J. Swanson, V. N. Duginov, E. Ramberg, E. Frlez, N. S. Froemming, I. Kourbanis, J. Mott, L. Santi, D. Kawall, Giovanni Cantatore, N. V. Khomutov, G. Corradi, D. Flay, C. C. Polly, Nicholas Eggert, S. Marignetti, R. Bjorkquist, S. Kim, Benjamin T. King, D. Moricciani, C. Gabbanini, A. Tewlsey-Booth, V. Krylov, Yu. M. Shatunov, Andre Frankenthal, S. Leo, M. E. Convery, S. Mastroianni, A. Chapelain, A. Palladino, Andrzej Wolski, H. Nguyen, B. Kiburg, Alexander Mikhailichenko, K. W. Merritt, J. Kaspar, Dinko Pocanic, M. Popovic, M. Lancaster, W. M. Morse, Timothy Chupp, M. McEvoy, Dariush Hampai, X. Ji, M. Shenk, S. Al-Kilani, A. K. Soha, D. A. Tarazona, Klaus-Peter Jungmann, Alejandro Garcia, Logashenko, I., Grange, J., Winter, P., Carey, R. M., Hazen, E., Kinnaird, N., Miller, J. P., Mott, J., Roberts, B. L., Crnkovic, J., Morse, W. M., Sayed, H. Kamal, Tishchenko, V., Druzhinin, V. P., Shatunov, Y. M., Bjorkquist, R., Chapelain, A., Eggert, N., Frankenthal, A., Gibbons, L., Kim, S., Mikhailichenko, A., Orlov, Y., Rider, N., Rubin, D., Sweigart, D., Allspach, D., Barzi, E., Casey, B., Convery, M. E., Drendel, B., Freidsam, H., Johnstone, C., Johnstone, J., Kiburg, B., Kourbanis, I., Lyon, A. L., Merritt, K. W., Morgan, J. P., Nguyen, H., Ostiguy, J. F., Para, A., Polly, C. C., Popovic, M., Ramberg, E., Rominsky, M., Soha, A. K., Still, D., Walton, T., Yoshikawa, C., Jungmann, K., Onderwater, C. J. G., Debevec, P., Leo, S., Pitts, K., Schlesier, C., Anastasi, A., Babusci, D., Corradi, G., Hampai, D., Palladino, A., Venanzoni, G., Dabagov, S., Ferrari, C., Fioretti, A., Gabbanini, C., Di Stefano, R., Marignetti, S., Iacovacci, M., Mastroianni, S., Di Sciascio, G., Moricciani, D., Cantatore, Giovanni, Karuza, M., Giovanetti, K., Baranov, V., Duginov, V., Khomutov, N., Krylov, V., Kuchinskiy, N., Volnykh, V., Gaisser, M., Haciomeroglu, S., Kim, Y., Lee, S., Lee, M., Semertzidis, Y. K., Won, E., Fatemi, R., Gohn, W., Gorringe, T., Bowcock, T., Carroll, J., King, B., Maxfield, S., Smith, A., Teubner, T., Whitley, M., Wormald, M., Wolski, A., Al Kilani, S., Chislett, R., Lancaster, M., Motuk, E., Stuttard, T., Warren, M., Flay, D., Kawall, D., Meadows, Z., Syphers, M., Tarazona, D., Chupp, T., Tewlsey Booth, A., Quinn, B., Eads, M., Epps, A., Luo, G., Mcevoy, M., Pohlman, N., Shenk, M., de Gouvea, A., Welty Rieger, L., Schellman, H., Abi, B., Azfar, F., Henry, S., Gray, F., Fu, C., Ji, X., Li, L., Yang, H., Stockinger, D., Cauz, D., Pauletta, G., Santi, L., Baessler, S., Frlez, E., Pocanic, D., Alonzi, L. P., Fertl, M., Fienberg, A., Froemming, N., Garcia, A., Hertzog, D. W., Kammel, P., Kaspar, J., Osofsky, R., Smith, M., Swanson, E., Lynch, K., Precision Frontier, Ostiguy, J. -F., Cantatore, G., Al-Kilani, S., Tewlsey-Booth, A., Welty-Rieger, L., and Abys, Salvatore
Subjects: Particle physics, magnetic moment, standard model, General Physics and Astronomy, Standard deviation, Standard Model, Muon magnetic moment, Nuclear physics, Physics and Astronomy (all), anomalous magnetic moment, Positron, muon anomaly, muon, Fermilab, Physical and Theoretical Chemistry, instrumentation, Physics, Muon, Anomalous magnetic moment, Standard model, Chemistry (all), Anomalous magnetic dipole moment, Magnetic moment, General Chemistry, Magnetic field, High Energy Physics::Experiment, measurement, muon, magnetic moment, instrumentation, measurement
Abstract: The anomalous magnetic moment of the muon is one of the most precisely measured quantities in experimental particle physics. Its latest measurement at Brookhaven National Laboratory deviates from the Standard Model expectation by approximately 3.5 standard deviations. The goal of the new experiment, E989, now under construction at Fermilab, is a fourfold improvement in precision. Here, we discuss the details of the future measurement and its current status. C 2015 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4917553]
Published: 2015

21. Publisher’s Note: Frequency shifts in gravitational resonance spectroscopy [Phys. Rev. D91, 042006 (2015)]

Author: E. A. Kupriyanova, S. Baeßler, A. Yu. Voronin, Guillaume Pignol, K.V. Protasov, Valery Nesvizhevsky, and D. Rebreyend
Subjects: Gravitation, Physics, Nuclear and High Energy Physics, Quantum mechanics, Resonance, Spectroscopy
Published: 2015

22. The New Muon g-2 experiment at Fermilab

Author: B. Abi T. Albahri, S. Al-Kilani, D. Allspach, L. P. Alonzi, A. Anastasi, F. Azfar, D. Babusci, S. Baessler, V. A. Baranov, E. Barzi, R. Bjorkquist, T. Bowcock, G. Cantatore, R. M. Carey, J. Carroll, B. Casey, D. Cauz, A. Chapelain, S. Chappa, S. Chattopadhyay, R. Chislett, T. E. Chupp, M. Convery, G. Corradi, J. Crnkovic, S. Dabagov, P. T. Debevec, G. Di Sciascio, R. Di Stefano, B. Drendel, V. P. Druzhinin, V. N. Duginov, M. Eads, N. Eggert, A. Epps, R. Fatemi, C. Ferrari, M. Fertl, A. T. Fienberg, A. Fioretti, D. Flay, A. S. Frankenthal, H. Friedsam, E. Frlez, N. S. Froemming, C. Fu, C. Gabbanini, M. Gaisser, S. Ganguly, A. Garcia, J. George, L. K. Gibbons, K. L. Giovanetti, S. Goadhouse, W. Gohn, T. Gorringe, J. Grange, F. Gray, S. Haciomeroglu, T. Halewood-Leagas, D. Hampai, E. Hazen, S. Henry, D. W. Hertzog, J. L. Holzbauer, M. Iacovacci, C. Johnstone, J. A. Johnstone, K. Jungmann, H. Kamal Sayed, P. Kammel, M. Karuza, J. Kaspar, D. Kawall, L. Kelton, K. S. Khaw, N. V. Khomutov, B. Kiburg, S. C. Kim, Y. I. Kim, B. King, N. Kinnaird, I. A. Koop, I. Kourbanis, V. A. Krylov, A. Kuchibhotla, N. A. Kuchinskiy, M. Lancaster, M. J. Lee, S. Lee, S. Leo, L. Li, I. Logashenko, G. Luo, K. R. Lynch, A. Lyon, S. Marignetti, S. Mastroianni, S. Maxfield, M. McEvoy, Z. Meadows, W. Merritt, A. A. Mikhailichenko, J. P. Miller, J. P. Morgan, D. Moricciani, W. M. Morse, J. Mott, E. Motuk, H. Nguyen, Y. Orlov, R. Osofsky, J. -F. Ostiguy, A. Palladino, G. Pauletta, K. Pitts, D. Pocanic, N. Pohlman, C. Polly, J. Price, B. Quinn, N. Raha, E. Ramberg, N. T. Rider, J. L. Ritchie, B. L. Roberts, M. Rominsky, D. L. Rubin, L. Santi, C. Schlesier, Y. K. Semertzidis, Y. M. Shatunov, M. Shenk, A. Smith, M. W. Smith, A. Soha, E. Solodov, D. Still, D. Stöckinger, T. Stuttard, H. E. Swanson, D. A. Sweigart, M. J. Syphers, S. Szustkowski, D. Tarazona, T. Teubner, A. E. Tewlsey-Booth, V. Tishchenko, G. Venanzoni, V. P. Volnykh, T. Walton, M. Warren, L. Welty-Rieger, M. Whitley, P. Winter, A. Wolski, E. Won, M. Wormald, W. Wu, H. Yang, C. Yoshikawa, Albahri, B. Abi T., Al-Kilani, S., Allspach, D., Alonzi, L. P., Anastasi, A., Azfar, F., Babusci, D., Baessler, S., Baranov, V. A., Barzi, E., Bjorkquist, R., Bowcock, T., Cantatore, G., Carey, R. M., Carroll, J., Casey, B., Cauz, D., Chapelain, A., Chappa, S., Chattopadhyay, S., Chislett, R., Chupp, T. E., Convery, M., Corradi, G., Crnkovic, J., Dabagov, S., Debevec, P. T., Di Sciascio, G., Di Stefano, R., Drendel, B., Druzhinin, V. P., Duginov, V. N., Eads, M., Eggert, N., Epps, A., Fatemi, R., Ferrari, C., Fertl, M., Fienberg, A. T., Fioretti, A., Flay, D., Frankenthal, A. S., Friedsam, H., Frlez, E., Froemming, N. S., Fu, C., Gabbanini, C., Gaisser, M., Ganguly, S., Garcia, A., George, J., Gibbons, L. K., Giovanetti, K. L., Goadhouse, S., Gohn, W., Gorringe, T., Grange, J., Gray, F., Haciomeroglu, S., Halewood-Leagas, T., Hampai, D., Hazen, E., Henry, S., Hertzog, D. W., Holzbauer, J. L., Iacovacci, M., Johnstone, C., Johnstone, J. A., Jungmann, K., Kamal Sayed, H., Kammel, P., Karuza, M., Kaspar, J., Kawall, D., Kelton, L., Khaw, K. S., Khomutov, N. V., Kiburg, B., Kim, S. C., Kim, Y. I., King, B., Kinnaird, N., Koop, I. A., Kourbanis, I., Krylov, V. A., Kuchibhotla, A., Kuchinskiy, N. A., Lancaster, M., Lee, M. J., Lee, S., Leo, S., Li, L., Logashenko, I., Luo, G., Lynch, K. R., Lyon, A., Marignetti, S., Mastroianni, S., Maxfield, S., Mcevoy, M., Meadows, Z., Merritt, W., Mikhailichenko, A. A., Miller, J. P., Morgan, J. P., Moricciani, D., Morse, W. M., Mott, J., Motuk, E., Nguyen, H., Orlov, Y., Osofsky, R., Ostiguy, J. -F., Palladino, A., Pauletta, G., Pitts, K., Pocanic, D., Pohlman, N., Polly, C., Price, J., Quinn, B., Raha, N., Ramberg, E., Rider, N. T., Ritchie, J. L., Roberts, B. L., Rominsky, M., Rubin, D. L., Santi, L., Schlesier, C., Semertzidis, Y. K., Shatunov, Y. M., Shenk, M., Smith, A., Smith, M. W., Soha, A., Solodov, E., Still, D., Stöckinger, D., Stuttard, T., Swanson, H. E., Sweigart, D. A., Syphers, M. J., Szustkowski, S., Tarazona, D., Teubner, T., Tewlsey-Booth, A. E., Tishchenko, V., Venanzoni, G., Volnykh, V. P., Walton, T., Warren, M., Welty-Rieger, L., Whitley, M., Winter, P., Wolski, A., Won, E., Wormald, M., Wu, W., Yang, H., and Yoshikawa, C.
Subjects: Precision Physics, Muon magnetic anomaly, Muon g-2 experiment
Abstract: There is a long standing discrepancy between the Standard Model prediction for the muon and the value measured by the Brookhaven E821 Experiment. At present the discrepancy stands at about three standard deviations, with a comparable accuracy between experiment and theory. Two new proposals – at Fermilab and J-PARC – plan to improve the experimental uncertainty by a factor of 4, and it is expected that there will be a significant reduction in the uncertainty of the Standard Model prediction. I will review the status of the planned experiment at Fermilab, E989, which will analyse 21 times more muons than the BNL experiment and discuss how the systematic uncertainty will be reduced by a factor of 3 such that a precision of 0.14 ppm can be achieved.
Published: 2015

23. A measurement of the antineutrino asymmetry B in free neutron decay

Author: D. Mund, C. Plonka, Valery Nesvizhevsky, T. Soldner, Ferenc Glück, J. Reich, M. Kreuz, S. Baeßler, A. Petoukhov, B. Brand, U. Mayer, C. Vogel, and Hartmut Abele
Subjects: Systematic error, Physics, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, Weak interaction, Beta decay, Asymmetry, Nuclear physics, Momentum, Double beta decay, High Energy Physics::Experiment, Neutron, Nuclear Experiment, Spin-½, media_common
Abstract: We have measured the antineutrino asymmetry B in neutron beta decay, i.e., the correlation of the neutron spin and the antineutrino momentum, with a new method. Our result is B = 0.967 ± 0.006 stat ± 0.010 syst = 0.967 ± 0.012 . Statistical and systematic uncertainty can be considerably reduced in future experiments.
Published: 2005

24. The neutron decay retardation spectrometer aSPECT: Electromagnetic design and systematic effects

Author: Werner Heil, Yu. Sobolev, J. Byrne, M. G. D. van der Grinten, I. Konorov, S. Baeßler, F. J. Hartmann, O. Zimmer, F. Glück, and G. Petzoldt
Subjects: Coupling constant, Physics, Nuclear and High Energy Physics, symbols.namesake, Spectrometer, Scattering, Double beta decay, symbols, Neutron, Atomic physics, Adiabatic process, Doppler effect, Magnetic field
Abstract: The apparatus described here, aSPECT, will be used for a measurement of the neutrino-electron angular correlation coefficient a in the decay of free neutrons. The idea of the aSPECT spectrometer is to measure the integrated proton energy spectrum very accurately using an energy filter by electrostatic retardation and magnetic adiabatic collimation. The main ideas of the spectrometer are presented, followed by an explanation of the adiabatic transmission function. Details of the superconducting coil and of the electrode system are given, as well as a discussion of the most important systematic effects: magnetic field and electrostatic potential inhomogeneities, deviation from adiabatic motion, scattering in the residual gas, background, Doppler effect, edge effect, and detector efficiency. Using this spectrometer, the parameter a is planned to be measured with an absolute experimental uncertainty of δa ≈ 3 . 10-4, from which the axial vector to vector coupling constant ratio λ can be determined with an accuracy of δλ ≈ 0.001.
Published: 2004

25. Neutron decay correlations in the Nab experiment

Author: C. Hendrus, W. Farrar, J. Wexler, P. E. Mueller, R. Mammei, G. W. Dodson, A. Smith, J. R. Calarco, E. Frlež, Ricardo Alarcon, Christopher Crawford, Vladimir Gudkov, K. P. Rykaczewski, John Ramsey, S. A. Page, A. Salas-Bacci, M. Martinez, J. Fry, Geoffrey Greene, B. Plaster, J. Dubois, Susanne Mertens, J. D. Bowman, Takeyasu M. Ito, F. W. Hersman, L. Barrón Palos, Mark Makela, J. Mirabal-Martinez, Seppo Penttila, Juliette Mammei, Eric Stevens, Ferenc Glück, W. S. Wilburn, Nadia Fomin, Sky Sjue, Wenjiang Fan, J. Caylor, N. Birge, J. W. Martin, R. Picker, D. C. Radford, Aaron Sprow, Albert Young, S. Baeßler, Dinko Pocanic, T. Bode, T. Brunst, Michael Gericke, R. Whitehead, P. L. McGaughey, N. Macsai, B. A. Zeck, Timothy Chupp, Hui Li, E. M. Scott, Robert Grzywacz, V. Cianciolo, E. Smith, and Leah Broussard
Subjects: Physics, History, 010308 nuclear & particles physics, Nuclear Theory, 01 natural sciences, Measure (mathematics), Computer Science Applications, Education, Term (time), Nuclear physics, 0103 physical sciences, Beta particle, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Beta (finance)
Abstract: The Nab experiment will measure the correlation a between the momenta of the beta particle and antineutrino in neutron decay as well as the Fierz term b which distorts the beta spectrum.
Published: 2017

26. The magnetic shielding for the neutron decay spectrometer aSPECT

Author: Y. Sobolev, S. Baeßler, Werner Heil, Gertrud Konrad, M. Borg, F.A. Guardia, Ferenc Glück, S. Hiebel, and Raquel Mu ~noz Horta
Subjects: Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Electromagnet, Magnetic energy, Demagnetizing field, Force between magnets, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), law.invention, Computational physics, Nuclear physics, Magnetization, law, Magnet, Electromagnetic shielding, Magnetic pressure, Nuclear Experiment (nucl-ex), Instrumentation, Nuclear Experiment
Abstract: Many experiments in nuclear and neutron physics are confronted with the problem that they use a superconducting magnetic spectrometer which potentially affects other experiments by their stray magnetic field. The retardation spectrometer a SPECT consists, inter alia, of a superconducting magnet system that produces a strong longitudinal magnetic field of up to 6.2 T. In order not to disturb other experiments in the vicinity of a SPECT, we had to develop a magnetic field return yoke for the magnet system. While the return yoke must reduce the stray magnetic field, the internal magnetic field and its homogeneity should not be affected. As in many cases, the magnetic shielding for a SPECT must manage with limited space. In addition, we must ensure that the additional magnetic forces on the magnet coils are not destructive. In order to determine the most suitable geometry for the magnetic shielding for a SPECT, we simulated a variety of possible geometries and combinations of shielding materials of non-linear permeability. The results of our simulations were checked through magnetic field measurements both with Hall and nuclear magnetic resonance probes. The experimental data are in good agreement with the simulated values: the mean deviation from the simulated exterior magnetic field is (−1.7±4.8)%. However, in the two critical regions, the internal magnetic field deviates by 0.2% (decay volume) and 1 × 10 − 4 (analyzing plane) from the simulated values.
Published: 2014

27. New precision measurements of free neutron beta decay with cold neutrons

Author: Seppo Penttila, S. Baeßler, Dinko Pocanic, and J. D. Bowman
Subjects: inorganic chemicals, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, Context (language use), 01 natural sciences, Standard Model, Nuclear physics, 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Coupling constant, integumentary system, 010308 nuclear & particles physics, technology, industry, and agriculture, Instrumentation and Detectors (physics.ins-det), Oak Ridge National Laboratory, Beta decay, Beamline, biological sciences, Physics::Accelerator Physics, lipids (amino acids, peptides, and proteins), High Energy Physics::Experiment, Spallation Neutron Source
Abstract: Precision measurements in free neutron beta decay serve to determine the coupling constants of beta decay, and offer several stringent tests of the Standard Model. This paper describes the free neutron beta decay program planned for the Fundamental Physics Beamline at the Spallation Neutron Source at Oak Ridge National Laboratory, and puts it into the context of other recent and planned measurements of neutron beta decay observables.
Published: 2014
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28. Neutron long wavelength cut-off filter

Author: Valery Nesvizhevsky, S. Baeßler, Hartmut Abele, P. Høghøj, O. Zimmer, J. Reich, and M. Astruc Hoffmann
Subjects: Nuclear and High Energy Physics, Materials science, business.industry, Detector, Neutron radiation, Polarizer, law.invention, Wavelength, Optics, law, Filter (video), Degree of polarization, Neutron, business, Instrumentation, Beam (structure)
Abstract: We report the first use of a long wavelength cut-off filter for a polarized cold neutron beam. If a supermirror polarizer is used, the degree of polarization of neutrons with relatively long wavelengths, say, longer than 1.3 nm, is poor and difficult to determine. The filter we used in this paper separates these undesired neutrons from the beam. The device is 8 mm long and consists of a stack of 118 Si wafers, whose surfaces are covered with m=3 Ni/Ti supermirrors (see Fig. 1 ) Download : Download high-res image (738KB) Download : Download full-size image Fig. 1 . Photograph of the wavelength cut-off filter. The neutron beam enters through the end of the Si wafers. B4C is added around the filter in order to prevent neutrons not filtered from reaching the detector. . The performance of this filter is described.
Published: 2000

29. A measurement of the beta asymmetry in neutron decay with PERKEO II

Author: P.v. Bülow, Hartmut Abele, O. Zimmer, U. Peschke, M. Astruc Hoffmann, Dirk Dubbers, S. Baeßler, Valery Nesvizhevsky, and J. Reich
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, media_common.quotation_subject, Hadron, Electron, Asymmetry, Beta decay, Nuclear physics, Neutron, Nucleon, Instrumentation, Radioactive decay, media_common
Abstract: The recent measurement of the electron asymmetry in neutron decay using the spectrometer PERKEO II is presented. In a preliminary analysis we arrive at the following result: A"!0.1189(8), implying j"!1.2740(21) ( 2000 Elsevier Science B.V. All rights reserved.
Published: 2000

30. Performance of the prototype LANL solid deuterium ultra-cold neutron source

Author: A. P. Serebrov, Christopher Morris, R. Mortenson, Juan-Manuel Anaya, E. Pasyuk, B. W. Filippone, Albert Young, A. Garcia, Peter Geltenbort, Takeyasu M. Ito, Gary E. Hogan, Steve K. Lamoreaux, W. A. Teasdale, S. Baessler, D. A. Smith, B. K. Fujikawa, R. Hill, L. J. Marek, Alexander Saunders, Chen-Yu Liu, J Hua, Seth Hoedl, S. J. Seestrom, T. J. Bowles, and G. L. Greene
Subjects: Physics, Nuclear and High Energy Physics, Proton, Physics::Instrumentation and Detectors, Monte Carlo method, chemistry.chemical_element, Nuclear physics, chemistry, Deuterium, Neutron source, Neutron, Spallation, Beryllium, Nuclear Experiment, Instrumentation, Beam (structure)
Abstract: A prototype of a solid deuterium (SD 2 ) source of Ultra-Cold Neutrons (UCN) is currently being tested at LANSCE. The source is contained within an assembly consisting of a 4 K polyethylene moderator surrounded by a 77 K beryllium flux trap in which is embedded a spallation target. Time-of-flight measurements have been made of the cold neutron spectrum emerging directly from the flux trap assembly. A comparison is presented of these measurements with results of Monte Carlo (LAHET/MCNP) calculations of the cold neutron fluxes produced in the prototype assembly by a beam of 800 MeV protons incident on the tungsten target. A UCN detector was coupled to the assembly through a guide system with a critical velocity of 8 m/s ( 58 Ni). The rates and time-of-flight data from this detector are compared with calculated values. Measurements of UCN production as a function of SD 2 volume (thickness) are compared with predicted values. The dependence of UCN production on SD 2 temperature and proton beam intensity are also presented.
Published: 2000

31. Results on the strong equivalence principle, dark matter, and new forces

Author: C. D. Hoyle, Jens H. Gundlach, Erik Swanson, A. Sharp, Eric Adelberger, Ulrich Schmidt, Blayne Heckel, Stephen M. Merkowitz, G. L. Smith, M. Harris, and S. Baessler
Subjects: Physics, Atmospheric Science, Physics beyond the Standard Model, Dark matter, Aerospace Engineering, Torsion (mechanics), Astronomy and Astrophysics, Torsion spring, Gravitation, Geophysics, Classical mechanics, Low energy, Space and Planetary Science, General Earth and Planetary Sciences, Equivalence principle
Abstract: Laboratory based torsion balance experiments allow sensitive tests of gravitational forces and of forces much weaker than gravity. Our EotWash group at the University of Washington has used torsion balances to set new limits on the equivalence principle and to probe new physics at very low energy scales. We present preliminary results that have implications for the strong equivalence principle, the interaction of ordinary matter with dark matter, and for limits on new forces between unpolarized and polarized matter.
Published: 2000

32. Neutron β-decay and the unitarity condition of the CKM matrix

Author: Dirk Dubbers, J. Reich, S. Baeßler, and Hartmut Abele
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Unitarity, Cabibbo–Kobayashi–Maskawa matrix, Neutron
Published: 2000

33. The Proton Spectrum in Neutron Beta Decay: Latest Results with the aSPECT Spectrometer

Author: O. Zimmer, H.-F. Wirth, Werner Heil, F. Ayala Guardia, R. Muñoz Horta, F. Glück, Gertrud Konrad, I. Konorov, M. Borg, M. Simson, T. Soldner, K. K. H. Leung, Y. Sobolev, and S. Baeßler
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, Proton, Cabibbo–Kobayashi–Maskawa matrix, Spectrum (functional analysis), Electron, Beta decay, Physics::Geophysics, Nuclear physics, Angular correlation, Neutron, Nuclear Experiment
Abstract: The purpose of the neutron decay spectrometer aSPECT is to determine the antineutrino electron angular correlation coefficient a with high precision. Latest measurements with aSPECT were performed during April/May 2008 at the Institut Laue-Langevin in Grenoble, France. In this paper we give a report on the experiment and the status of the ongoing data analysis.
Published: 2009

34. Internal friction and hypersonic velocity in vitreous germania under high pressure

Author: G. Kasper, J Hertling, S. Hunklinger, S. Baeßler, and S. Rau
Subjects: Phase transition, Hypersonic speed, Condensed matter physics, business.industry, Chemistry, media_common.quotation_subject, Condensed Matter Physics, Asymmetry, Internal friction, Electronic, Optical and Magnetic Materials, Optics, High pressure, Materials Chemistry, Ceramics and Composites, Particle velocity, business, media_common
Abstract: Measurements of internal friction and acoustic velocity at 25 GHz in vitreous germania (a-GeO 2 ) from 50 K to 750 K and pressures to 4 GPa are reported. A maximum in internal friction and minimum in sound velocity are observed at about 1 GPa. Above 3 GPa, the acoustic properties become increasingly irreversible. Results are discussed on the basis of relaxing entities residing in double-well potentials with a Gaussian distribution of barrier heights and a Lorentzian distribution in the asymmetry energy as in vitreous silica. The microscopic origin of the anomalies might be structural changes which take place within small regions of the glass in analogy to phase transitions occurring in the crystalline polymorphs under similar conditions.
Published: 1998

35. Brillouin scattering of vitreous silica under high pressure

Author: G. Kasper, Siegfried Hunklinger, S. Rau, S. Baeßler, and Georg Weiss
Subjects: Range (particle radiation), Materials science, business.industry, Relaxation (NMR), General Physics and Astronomy, Molecular physics, Brillouin zone, Optics, Position (vector), Brillouin scattering, High pressure, Thermal, business, Quantum tunnelling
Abstract: Ultrasonic absorption in vitreous silica (a-SiO2) exhibits a prominent maximum, the so-called 50 K-peak. It is caused by thermally activated relaxation processes as can be inferred from the position of the maximum which shifts from 30 K at a measuring frequency of 1 kHz to above 100 K at Brillouin frequencies. The microscopic nature of the relaxing ‘particles’ is unknown but they are believed to originate intrinsically from the random network of the glass. Nevertheless, in the framework of phenomenological models, like the tunneling model or the soft potential model, it is possible to describe the experiments very well in the full range of measured frequencies and temperatures. Both models are founded on the assumption that the particles reside in double well potentials and that their dynamics are based on tunneling between the two equilibrium positions at low temperatures, whereas thermal activation over the barriers is dominating at temperatures exceeding a few Kelvin [1,2].
Published: 1995

36. Neutron Beta Decay Studies with Nab

Author: L. P. Alonzi, T. V. Vianciolo, Robert Grzywacz, K. P. Rykaczewski, Vladimir Gudkov, A. Salas-Bacci, S. Balascuta, S. McGovern, D. Harrison, L. Barrón-Palos, Christopher Crawford, M. Bychkov, A. R. Young, F. Glück, Seppo Penttila, W. S. Wilburn, F. W. Hersman, P. L. McGaughey, S. A. Page, Daniel Wagner, J. W. Martin, Takeyasu M. Ito, S. Baeßler, Ricardo Alarcon, Geoffrey Greene, J. R. Calarco, E. Frlež, Mark Makela, Michael Gericke, J. D. Bowman, J. Byrne, Dinko Pocanic, Timothy Chupp, and Z. Tompkins
Subjects: Coupling constant, Physics, Nuclear physics, Spectrometer, FOS: Physical sciences, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, Beta decay, Standard Model
Abstract: Precision measurements in neutron beta decay serve to determine the coupling constants of beta decay and allow for several stringent tests of the standard model. This paper discusses the design and the expected performance of the Nab spectrometer., Submitted to Proceedings of the Conference CIPANP12, St.Petersburg, Florida, May 2012
Published: 2012

37. IMPACT OF NEUTRON DECAY EXPERIMENTS ON NON-STANDARD MODEL PHYSICS

Author: Gertrud Konrad, Werner Heil, S. Baeßler, F. Glück, and Dinko Pocanic
Subjects: Physics, Particle physics, Field (physics), 010308 nuclear & particles physics, Physics beyond the Standard Model, Scalar (physics), FOS: Physical sciences, Context (language use), Observable, 01 natural sciences, High Energy Physics - Experiment, Standard Model, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Double beta decay, 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract: This paper gives a brief overview of the present and expected future limits on physics beyond the Standard Model (SM) from neutron beta decay, which is described by two parameters only within the SM. Since more than two observables are accessible, the problem is over-determined. Thus, precise measurements of correlations in neutron decay can be used to study the SM as well to search for evidence of possible extensions to it. Of particular interest in this context are the search for right-handed currents or for scalar and tensor interactions. Precision measurements of neutron decay observables address important open questions of particle physics and cosmology, and are generally complementary to direct searches for new physics beyond the SM in high-energy physics. Free neutron decay is therefore a very active field, with a number of new measurements underway worldwide. We present the impact of recent developments., 13 pages, 6 figures; Proceedings of the 5th International BEYOND 2010 Conference, Cape Town, South Africa (2010), World Scientific, accepted for publication; Corrected typos
Published: 2011

38. A method to measure the resonance transitions between the gravitationally bound quantum states of neutrons in the GRANIT spectrometer

Author: M. Kreuz, T.M. Kuzmina, Hans G. Börner, R. Flaminio, Ludmilla Grigorieva, A. M. Gagarski, T. Soldner, P. Schmidt-Wellenburg, Valery Nesvizhevsky, M. Thomas, A. V. Strelkov, L. Pinard, K.V. Protasov, Fabrice Naraghi, Francis Vezzu, Guillaume Pignol, A. Yu. Voronin, N. Morgado, S. Baeßler, D. Rebreyend, Alexander E. Meyerovich, Christine Michel, G. A. Petrov, L. P. Mezhov-Deglin, Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des matériaux avancés (LMA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), T. Soldner, V. Nesvizhevsky, C. Plonka-Spehr, K. Protasov, K. Schreckenbach, and O. Zimmer
Subjects: Quantum phase transition, Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Quantum limit, Quantum dynamics, Quantum simulator, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Quantum number, 01 natural sciences, symbols.namesake, Open quantum system, Pauli exclusion principle, Quantum mechanics, 0103 physical sciences, Principal quantum number, symbols, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Instrumentation
Abstract: International audience; We present a method to measure the resonance transitions between the gravitationally bound quantum states of neutrons in the GRANIT spectrometer. The purpose of GRANIT is to improve the accuracy of measurement of the quantum states parameters by several orders of magnitude, taking advantage of long storage of Ultracold neutrons at specula trajectories. The transitions could be excited using a periodic spatial variation of a magnetic field gradient. If the frequency of such a perturbation (in the frame of a moving neutron) coincides with a resonance frequency defined by the energy difference of two quantum states, the transition probability will sharply increase. The GRANIT experiment is motivated by searches for short-range interactions (in particular spin-dependent interactions), by studying the interaction of a quantum system with a gravitational field, by searches for extensions of the Standard model, by the unique possibility to check the equivalence principle for an object in a quantum state and by studying various quantum optics phenomena.
Published: 2009

39. Measurement of parity-violating neutron capture gamma asymmetries at low-energies

Author: L. Barrón-Palos, R. Alarcon, L.P. Alonzi, S. Baeßler, S. Balascuta, M. Bychkov, J.R. Calarco, R.D. Carlini, E. Chávez, W.C. Chen, T.E. Chupp, C. Crawford, Q. Curiel-García, M. Dabaghyan, J. Dadras, A. Danagoulian, M.C. Estes, N. Fomin, S.J. Freedman, E. Frlez, T.R. Gentile, M.T. Gericke, R.C. Gillis, G.L. Greene, F.W. Hersman, B. Hona, A. Huerta, T. Ino, G.L. Jones, A. Komives, B. Lauss, W. Lee, M. Leuschner, W. Losowski, R. Mahurin, D. Marin-Lámbarri, E. Martin, Y. Masuda, J. Mei, G.S. Mitchell, P.E. Mueller, M. Musgrave, S. Muto, H. Nann, M.E. Ortiz, A. Palladino, S. Page, S.I. Penttila, D. Pocanic, J. Prince, D. Ramsay, P. Rodríguez-Zamora, A. Salas-Bacci, S. Santra, P.-N. Seo, E. Sharapov, M. Sharma, T. Smith, W.M. Snow, Z. Tang, S. Vorndran, W.S. Wilburn, M. Whitehead, V. Yuan, and J.D. Bowman
Subjects: Física, Astronomía y Matemáticas
Published: 2009

40. Constraints on spin-dependent short-range interactions using gravitational quantum levels of ultracold neutrons

Author: K.V. Protasov, Guillaume Pignol, S. Baeßler, Valery Nesvizhevsky, A. Yu. Voronin, Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), T. Soldner, V. Nesvizhevsky, C. Plonka-Spehr, K. Protasov, K. Schreckenbach, and O. Zimmer
Subjects: Nuclear and High Energy Physics, FOS: Physical sciences, 01 natural sciences, Short range interactions, Gravitation, Nuclear physics, [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph], 0103 physical sciences, Bound state, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Quantum, ComputingMilieux_MISCELLANEOUS, Spin-½, Physics, 010308 nuclear & particles physics, Ultra-cold neutrons, 11.30.Er, 14.80.Mz, 04.80.Cc, CP violation, Orders of magnitude (time), Ultracold neutrons
Abstract: In this paper, we discuss a possibility to improve constraints on spin-dependent short-range interactions in the range of 1 - 200 micrometer significantly. For such interactions, our constraints are without competition at the moment. They were obtained through the observation of gravitationally bound states of ultracold neutrons. We are going to improve these constraints by about three orders of magnitude in a dedicated experiment with polarized neutrons using the next-generation spectrometer GRANIT., Comment: 5 pages, 4 figures, accepted for publication in the Proceedings of the International Workshop on Particle Physics with Cold Neutrons, Grenoble, May 2008, to be published in Nucl. Instr. and Meth. A
Published: 2009
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41. Measuring the proton spectrum in neutron decay - latest results with aSPECT

Author: F. Ayala Guardia, F. Glück, M. Borg, H.-F. Wirth, T. Soldner, Werner Heil, O. Zimmer, K. K. H. Leung, R. Muñoz Horta, M. Simson, Gertrud Konrad, I. Konorov, Yu. Sobolev, and S. Baeßler
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, Proton, Cabibbo–Kobayashi–Maskawa matrix, FOS: Physical sciences, Electron, Measure (mathematics), Nuclear physics, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation, Order of magnitude, Beam (structure)
Abstract: The retardation spectrometer aSPECT was built to measure the shape of the proton spectrum in free neutron decay with high precision. This allows us to determine the antineutrino electron angular correlation coefficient a. We aim for a precision more than one order of magnitude better than the present best value, which is Delta_a /a = 5%. In a recent beam time performed at the Institut Laue-Langevin during April / May 2008 we reached a statistical accuracy of about 2% per 24 hours measurement time. Several systematic effects were investigated experimentally. We expect the total relative uncertainty to be well below 5%., Comment: Accepted for publication in the Conference Proceedings of the International Workshop on Particle Physics with Slow Neutrons 2008 held at the ILL, France. To be published in Nuclear Instruments and Methods in Physics Research, Section A
Published: 2008
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42. Nab: Measurement Principles, Apparatus and Uncertainties

Author: Seppo Penttila, L. P. Alonzi, Albert Young, Robert Grzywacz, A. Palladino, S. Baeßler, A. Klein, J. R. Calarco, W. S. Wilburn, V. Cianciolo, J. D. Bowman, Christopher Crawford, Michael Gericke, M. Bychkov, Vladimir Gudkov, Dinko Pocanic, F. W. Hersman, G. R. Young, K. P. Rykaczewski, J. Byrne, Geoffrey Greene, J. W. Martin, S. A. Page, S. Balascuta, Ricardo Alarcon, and E. Frlež
Subjects: Physics, Coupling constant, Coupling, Nuclear and High Energy Physics, Spectrometer, Detector, Nuclear Theory, FOS: Physical sciences, High Energy Physics - Experiment, Magnetic field, Nuclear physics, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Neutron, Tensor, Nuclear Experiment (nucl-ex), Nucleon, Nuclear Experiment, Instrumentation, Nuclear Physics
Abstract: The Nab collaboration will perform a precise measurement of 'a', the electron-neutrino correlation parameter, and 'b', the Fierz interference term in neutron beta decay, in the Fundamental Neutron Physics Beamline at the SNS, using a novel electric/magnetic field spectrometer and detector design. The experiment is aiming at the 10^{-3} accuracy level in (Delta a)/a, and will provide an independent measurement of lambda = G_A/G_V, the ratio of axial-vector to vector coupling constants of the nucleon. Nab also plans to perform the first ever measurement of 'b' in neutron decay, which will provide an independent limit on the tensor weak coupling., Comment: 12 pages, 6 figures, 1 table, talk presented at the International Workshop on Particle Physics with Slow Neutrons, Grenoble, 29-31 May 2008; to appear in Nucl. Instrum. Meth. in Physics Research A
Published: 2008
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43. A clean, bright, and versatile source of neutron decay products

Author: Bastian Märkisch, D. Dubbers, Hartmut Abele, O. Zimmer, S. Baeßler, Marc Schumann, and T. Soldner
Subjects: Physics, Nuclear and High Energy Physics, Neutron emission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, Neutron scattering, Neutron time-of-flight scattering, Charged particle, Neutron temperature, Nuclear physics, Neutron cross section, Physics::Accelerator Physics, Neutron detection, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation
Abstract: We present a case study on a new type of cold neutron beam station for the investigation of angular correlations in the beta-decay of free neutrons. With this beam station, called PERC, the 'active decay volume' lies inside the neutron guide, and the charged neutron decay products are magnetically guided towards the end of the neutron guide. Hence, the guide delivers at its exit a beam of decay electrons and protons, under well-defined and precisely variable conditions, which can be well separated from the cold neutron beam. In this way a general-purpose source of neutron decay products is obtained which can be used for various different experiments in neutron decay correlation spectroscopy. A gain in phase space density of several orders of magnitude can be achieved with PERC, as compared to existing neutron decay spectrometers. Neutron beam related background is separately measurable in PERC, and magnetic mirror effects on the charged neutron decay products and edge effects in the active neutron beam volume are both strongly suppressed. Therefore the spectra and angular distributions of the emerging decay particles will be distortion-free on the level of 10^-4, more than 10 times better than achieved today., Comment: 20 pages, 6 figures
Published: 2007
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44. Constraint on the coupling of axionlike particles to matter via ultracold neutron gravitational experiment

Author: K.V. Protasov, A. Yu. Voronin, Valery Nesvizhevsky, S. Baeßler, Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), and GRANIT
Subjects: Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, FOS: Physical sciences, Elementary particle, 01 natural sciences, High Energy Physics - Phenomenology (hep-ph), Gravitational field, 14.80.Mz, 04.80.-y, gravitational experiments, 0103 physical sciences, ultracold neutrons, Neutron, 010306 general physics, Nuclear Experiment, Axion, Physics, 010308 nuclear & particles physics, Fermion, Coupling (probability), Quantum number, gravity, CP invariance, High Energy Physics - Phenomenology, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Ultracold neutrons
Abstract: We present a new constraint for the axion monopole-dipole coupling in the range of 1 micrometer to a few millimeters, previously unavailable for experimental study. The constraint was obtained using our recent results on the observation of neutron quantum states in the Earth's gravitational field. We exploit the ultimate sensitivity of ultra-cold neutrons (UCN) in the lowest gravitational states above a material surface to any additional interaction between the UCN and the matter, if the characteristic interaction range is within the mentioned domain. In particular, we find that the upper limit for the axion monopole-dipole coupling constant is (g_p g_s)/(\hbar c), 5 pages 3 figures
Published: 2007

45. The Proton Spectrum in Neutron Beta Decay: First Results with the aSPECT spectrometer

Author: S. Baeßler, H. Angerer, F. Ayala Guardia, M. Borg, K. Eberhardt, F. Glück, W. Heil, I. Konorov, G. Konrad, N. Luquero Llopis, R. Muñoz Horta, M. Orlowski, G. Petzoldt, D. Rich, M. Simson, Y. Sobolev, H. F. Wirth, O. Zimmer, and Tony M. Liss
Subjects: Physics, Nuclear physics, Beamline, Proton, Spectrometer, Double beta decay, Neutron cross section, Physics::Accelerator Physics, Research reactor, Neutron, Nuclear Experiment, Beam (structure)
Abstract: First measurements with the aSPECT spectrometer have been performed in a beam time at the beam line MEPHISTO of the neutron research reactor FRM‐II. In this paper we give a short description of the spectrometer. The data analysis is still underway.
Published: 2006

46. Quantum motion of a neutron in a wave-guide in the gravitational field

Author: Valery Nesvizhevsky, Hartmut Abele, A. Yu. Voronin, Alexander Westphal, A. K. Petukhov, K.V. Protasov, S. Baeßler, Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), and GRANIT
Subjects: Physics, Quantum Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, FOS: Physical sciences, 04.80.Cc, 04.25.Nx, 01 natural sciences, law.invention, Formalism (philosophy of mathematics), Gravitational field, Quantum state, law, Quantum mechanics, Rough surface, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], 0103 physical sciences, Neutron, 010306 general physics, Quantum Physics (quant-ph), Waveguide, Quantum, Gravitational redshift
Abstract: We study theoretically the quantum motion of a neutron in a horizontal waveguide in the gravitational field of the Earth. The waveguide in question is equipped with a mirror below and a rough surface absorber above. We show that such a system acts as a quantum filter, i.e. it effectively absorbs quantum states with sufficiently high transversal energy but transmits low-energy states. The states transmitted are determined mainly by the potential well formed by the gravitational field of the Earth and the mirror. The formalism developed for quantum motion in an absorbing waveguide is applied to the description of the recent experiment on the observation of the quantum states of neutrons in the Earth's gravitational field.
Published: 2005
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47. Study of the neutron quantum states in the gravity field

Author: V. V. Nesvizhevsky, A. K. Petukhov, H. G. Börner, T. A. Baranova, A. M. Gagarski, G. A. Petrov, K. V. Protasov, A. Yu Voronin, S. Baeßler, H. Abele, A. Westphal, L. Lucovac, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), and GRANIT
Subjects: Particle physics, Physics and Astronomy (miscellaneous), Measure (physics), 03.65, 28.20, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Phenomenology (hep-ph), Gravitational field, Quantum state, 0103 physical sciences, Neutron detection, Neutron, 10. No inequality, 010306 general physics, Wave function, Engineering (miscellaneous), Image resolution, Physics, 010308 nuclear & particles physics, quantum mechanics, neutrons, Computational physics, High Energy Physics - Phenomenology, Distribution (mathematics), gravitation, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
Abstract: We have studied neutron quantum states in the potential well formed by the earth's gravitational field and a horizontal mirror. The estimated characteristic sizes of the neutron wave functions in the two lowest quantum states correspond to expectations with an experimental accuracy. A position-sensitive neutron detector with an extra-high spatial resolution of ~2 microns was developed and tested for this particular experiment, to be used to measure the spatial density distribution in a standing neutron wave above a mirror for a set of some of the lowest quantum states. The present experiment can be used to set an upper limit for an additional short-range fundamental force. We studied methodological uncertainties as well as the feasibility of improving further the accuracy of this experiment.
Published: 2005
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48. (3) He Spin Filter for Neutrons

Author: M, Batz, S, Baeßler, W, Heil, E W, Otten, D, Rudersdorf, J, Schmiedeskamp, Y, Sobolev, and M, Wolf
Subjects: relaxation, Nuclear Theory, polarization analysis, 3He polarizer and compressor, neutron spin filter, polarized neutrons, Nuclear Experiment, Article, optical pumping, parity violation
Abstract: The strongly spin-dependent absorption of neutrons in nuclear spin-polarized (3)He opens up the possibility of polarizing neutrons from reactors and spallation sources over the full kinematical range of cold, thermal and hot neutrons. This paper gives a report on the neutron spin filter (NSF) development program at Mainz. The polarization technique is based on direct optical pumping of metastable (3)He atoms combined with a polarization preserving mechanical compression of the gas up to a pressure of several bar, necessary to run a NSF. The concept of a remote type of operation using detachable NSF cells is presented which requires long nuclear spin relaxation times of order 100 hours. A short survey of their use under experimental conditions, e.g. large solid-angle polarization analysis, is given. In neutron particle physics NSFs are used in precision measurements to test fundamental symmetry concepts.
Published: 2004

49. Measurement of quantum states of neutrons in the Earth's gravitational field

Author: Valery Nesvizhevsky, A. Petoukhov, Hartmut Abele, A. Yu. Voronin, F. J. Rueß, A.M Gagarski, G. A. Petrov, G. Divkovic, Alexander Westphal, K.V. Protasov, Th. Stöferle, Hans G. Börner, A. V. Strelkov, S. Baeßler, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), and GRANIT
Subjects: Nuclear and High Energy Physics, Neutron transport, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Phenomenology (hep-ph), Gravitational field, Quantum state, Quantum mechanics, 0103 physical sciences, Neutron, Quantum field theory, 010306 general physics, Nuclear Experiment, Physics, 03.65.Ta, 010308 nuclear & particles physics, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], Fermion, Quantum number, quantum theory, neutron reflection, Computational physics, High Energy Physics - Phenomenology, neutron absorption, quantum gravity, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Quantum gravity
Abstract: The lowest stationary quantum state of neutrons in the Earth's gravitational field is identified in the measurement of neutron transmission between a horizontal mirror on the bottom and an absorber/scatterer on top. Such an assembly is not transparent for neutrons if the absorber height is smaller than the ``height'' of the lowest quantum state.
Published: 2003

50. Is the Unitarity of the Quark-Mixing CKM Matrix Violated in Neutronβ-Decay?

Author: Valery Nesvizhevsky, S. Baessler, D. Dubbers, J. Reich, M. Astruc Hoffmann, U. MüLLER, Ferenc Glück, Hartmut Abele, and O. Zimmer
Subjects: Quark, Physics, Coupling constant, Particle physics, Matrix (mathematics), Unitarity, Cabibbo–Kobayashi–Maskawa matrix, General Physics and Astronomy, Neutron, Particle Data Group, Pseudovector, High Energy Physics - Experiment
Abstract: We report on a new measurement of neutron $\beta$-decay asymmetry. From the result \linebreak $A_0$ = -0.1189(7), we derive the ratio of the axial vector to the vector coupling constant $\lambda$ = ${\it g_A/g_V}$ = -1.2739(19). When included in the world average for the neutron lifetime $\tau$ = 885.7(7)s, this gives the first element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix $V_{ud} $. With this value and the Particle Data Group values for $V_{us}$ and $V_{ub}$, we find a deviation from the unitarity condition for the first row of the CKM matrix of $\Delta$ = 0.0083(28), which is 3.0 times the stated error.
Published: 2002

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