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321 results on '"Babcock, E. A."'

1. A Complete Approach to Determine the $^3$He neutron incoherent scattering length $b_i$

Author

Lu, H., Holderer, O., Ioffe, A., Pasini, S., Pistel, P., Salhi, Z., Goodson, B. M., Snow, W. M., and Babcock, E.

Subjects
Nuclear Experiment, Physics - Atomic Physics
Abstract

We report the first results from a new approach for measuring the $^3$He neutron incoherent scattering length $b_{i}$. $b_{i}$ is directly proportional to the difference $\Delta b=b_{+}-b_{-}$ in the two low-energy s-wave neutron-nucleus scattering amplitudes $b_{+}$ and $b_{-}$, corresponding to the singlet $J=0$ and triplet $J=1$ states of the neutron-$^3$He interaction, respectively. An accurate measurement of $b_{i}$ can help distinguish among different models of three-nucleon interactions by comparison to {\it ab initio} nuclear theory calculations. The neutron birefringence caused by $\Delta b$ results in neutron spin rotation around the nuclear polarization. We measured $\Delta b$ using polarized neutron spin rotation and the transmission of neutrons through a $^3$He gas target polarized in situ by spin-exchange optical pumping. This brief test measurement, conducted at the FZ-J\"ulich neutron spin echo spectrometer at the Heinz Maier Leibnitz Zentrum (MLZ), yielded $\Delta b = [-5.27 \pm 0.05$ (stat.) $- 0.05$ (syst.)] fm. We argue that this method can be improved in precision to resolve the discrepancies between two prior measurements of $b_i$ which are dependent on the polarized absorption cross section $\sigma_p$. Further with absolute $^{3}$He polarization via NMR (in a properly-shaped cell) concurrent with accurate neutron transmission measurements, $\sigma_p$ can be measured to obtain independent values of $b_{+}$ and $b_{-}$., Comment: 8 pages, 3 figures. includes Supplement

Published
2023

2. First Measurement of Neutron Birefringence in Polarized $^{129}$Xe and $^{131}$Xe Nuclei

Author

Lu, H., Barlow, M. J., Basler, D., Gutfreund, P., Holderer, O., Ioffe, A., Pasini, S., Pistel, P., Salhi, Z., Zhernenkov, K., Goodson, B. M., Snow, W. M., and Babcock, E.

Subjects
Nuclear Experiment, Condensed Matter - Materials Science, High Energy Physics - Experiment, Physics - Atomic Physics, Quantum Physics
Abstract

We present the first measurements of polarized neutron birefringence in transmission through nuclear-polarized $^{129}$Xe and $^{131}$Xe gas and determine the neutron incoherent scattering lengths $b_i(^{129}Xe)=0.186\pm(0.021)_{stat.}\pm(0.004)_{syst.}\space\text{ fm}$ and $b_i(^{131}Xe)=2.09\pm(0.29)_{stat.}\pm(0.12)_{syst.}\space\text{ fm}$ for the first time. These results determine the essential parameter needed for interpretation of spin-dependent neutron-scattering studies on polarized xenon ensembles, with possible future applications ranging from tests of time-reversal violation to mode-entangled neutron scattering experiments on nuclear-polarized systems., Comment: 7 pages, 3 figures, submitted to PRL

Published
2023

3. Direct observation of cycloidal spin modulation and field-induced transition in N\'eel-type skyrmion-hosting VOSe$_2$O$_5$

Author

Kurumaji, T., Nakajima, T., Feoktystov, A., Babcock, E., Salhi, Z., Ukleev, V., Arima, T., Kakurai, K., and Tokura, Y.

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

We investigate the spin rotational structure of magnetic skyrmions in a tetragonal polar magnet VOSe2O5 via polarized small-angle neutron scattering (SANS). Spin polarization analysis of the scattered neutrons provides consistent evidence for the cycloidal spin modulation in all the incommensurate phases at zero and non-zero magnetic field along the c axis, including the triangular skyrmion-lattice phase. In the vicinity of the skyrmion phase, we performed extensive SANS measurements to unravel a field-induced incommensurate phase (IC-2 state). We discuss the possibility of anisotropic double-q state as an alternative spin structure to provisional square skyrmion-lattice state., Comment: 27 pages, 5 figures

Published
2019
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4. New Limit on the Permanent Electric Dipole Moment of $^{129}$Xe using $^{3}$He Comagnetometry and SQUID Detection

Author

Sachdeva, N., Fan, I., Babcock, E., Burghoff, M., Chupp, T. E., Degenkolb, S., Fierlinger, P., Haude, S., Kraegeloh, E., Kilian, W., Knappe-Grüneberg, S., Kuchler, F., Liu, T., Marino, M., Meinel, J., Rolfs, K., Salhi, Z., Schnabel, A., Singh, J. T., Stuiber, S., Terrano, W. A., Trahms, L., and Voigt, J.

Subjects
Physics - Atomic Physics
Abstract

We report results of a new technique to measure the electric dipole moment of $^{129}$Xe with $^3$He comagnetometry. Both species are polarized using spin-exchange optical pumping, transferred to a measurement cell, and transported into a magnetically shielded room, where SQUID magnetometers detect free precession in applied electric and magnetic fields. The result from a one week measurement campaign in 2017 and a 2.5 week campaign in 2018, combined with detailed study of systematic effects, is $d_A(^{129}\mathrm{Xe}) = (1.4 \pm 6.6_\mathrm{stat} \pm 2.0_\mathrm{syst})\times10^{-28}~e\,\mathrm{cm}$. This corresponds to an upper limit of $|d_A(^{129}\mathrm{Xe})| < 1.4 \times 10^{-27} ~e\,\mathrm{cm}~(95\%~\mathrm{CL})$, a factor of five more sensitive than the limit set in 2001., Comment: To be published in Physical Review Letters. arXiv admin note: substantial text overlap with arXiv:1902.02864

Published
2019
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5. A new measurement of the permanent electric dipole moment of $^{129}$Xe using $^{3}$He comagnetometry and SQUID detection

Author

Sachdeva, N., Fan, I., Babcock, E., Burghoff, M., Chupp, T. E., Degenkolb, S., Fierlinger, P., Kraegeloh, E., Kilian, W., Knappe-Grüneberg, S., Kuchler, F., Liu, T., Marino, M., Meinel, J., Salhi, Z., Schnabel, A., Singh, J. T., Stuiber, S., Terrano, W. A., Trahms, L., and Voigt, J.

Subjects
Physics - Atomic Physics, Physics - Instrumentation and Detectors
Abstract

We describe a new technique to measure the EDM of $^{129}$Xe with $^3$He comagnetometry. Both species are polarized using spin-exchange optical pumping, transferred to a measurement cell, and transported into a magnetically shielded room, where SQUID magnetometers detect free precession in applied electric and magnetic fields. The result of a one week run combined with a detailed study of systematic effects is $d_A(^{129}\mathrm{Xe}) = (0.26 \pm 2.33_\mathrm{stat} \pm 0.72_\mathrm{syst})\times10^{-27}~e\,\mathrm{cm}$. This corresponds to an upper limit of $|d_A(^{129}\mathrm{Xe})| < 4.81\times 10^{-27} ~e\,\mathrm{cm}~(95\%~\mathrm{CL})$, a factor of 1.4 more sensitive than the previous limit.

Published
2019

6. The instrument suite of the European Spallation Source

Author

Andersen, K.H., Argyriou, D.N, Jackson, A.J., Houston, J., Henry, P.F., Deen, P.P., Toft-Petersen, R., Beran, P., Strobl, M., Arnold, T., Wacklin-Knecht, H., Tsapatsaris, N., Oksanen, E., Woracek, R., Schweika, W., Mannix, D., Hiess, A., Kennedy, S., Kirstein, O., Petersson Årsköld, S., Taylor, J., Hagen, M.E., Laszlo, G., Kanaki, K., Piscitelli, F., Khaplanov, A., Stefanescu, I., Kittelmann, Th., Pfeiffer, D., Hall-Wilton, R., Lopez, C.I., Aprigliano, G., Whitelegg, L., Moreira, F.Y., Olsson, M., Bordallo, H.N., Martín-Rodríguez, D., Schneider, H., Sharp, M., Hartl, M., Nagy, G., Ansell, S., Pullen, S., Vickery, A., Fedrigo, A., Mezei, F., Arai, M., Heenan, R.K., Halcrow, W., Turner, D., Raspino, D., Orszulik, A., Cooper, J., Webb, N., Galsworthy, P., Nightingale, J., Langridge, S., Elmer, J., Frielinghaus, H., Hanslik, R., Gussen, A., Jaksch, S., Engels, R., Kozielewski, T., Butterweck, S., Feygenson, M., Harbott, P., Poqué, A., Schwaab, A., Lieutenant, K., Violini, N., Voigt, J., Brückel, T., Koenen, M., Kämmerling, H., Babcock, E., Salhi, Z., Wischnewski, A., Heynen, A., Désert, S., Jestin, J., Porcher, F., Fabrèges, X., Fabrèges, G., Annighöfer, B., Klimko, S., Dupont, Th., Robillard, Th., Goukassov, A., Longeville, S., Alba-Simionesco, Ch., Bourges, Ph., Guyon Le Bouffy, J., Lavie, P., Rodrigues, S., Calzada, E., Lerche, M., Schillinger, B., Schmakat, Ph., Schulz, M., Seifert, M., Lohstroh, W., Petry, W., Neuhaus, J., Loaiza, L., Tartaglione, A., Glavic, A., Schütz, S., Stahn, J., Lehmann, E., Morgano, M., Schefer, J., Filges, U., Klauser, Ch., Niedermayer, Ch., Fenske, J., Nowak, G., Rouijaa, M., Siemers, D.J., Kiehn, R., Müller, M., Carlsen, H., Udby, L., Lefmann, K., Birk, J.O., Holm-Dahlin, S., Bertelsen, M., Hansen, U. Bengaard, Olsen, M.A., Christensen, M., Iversen, K., Christensen, N.B., Rønnow, H.M., Freeman, P.G., Hauback, B.C., Kolevatov, R., Llamas-Jansa, I., Orecchini, A., Sacchetti, F., Petrillo, C., Paciaroni, A., Tozzi, P., Zanatta, M., Luna, P., Herranz, I., del Moral, O.G., Huerta, M., Magán, M., Mosconi, M., Abad, E., Aguilar, J., Stepanyan, S., Bakedano, G., Vivanco, R., Bustinduy, I., Sordo, F., Martínez, J.L., Lechner, R.E., Villacorta, F.J., Šaroun, J., Lukáš, P., Markó, M., Zanetti, M., Bellissima, S., del Rosso, L., Masi, F., Bovo, C., Chowdhury, M., De Bonis, A., Di Fresco, L., Scatigno, C., Parker, S.F., Fernandez-Alonso, F., Colognesi, D., Senesi, R., Andreani, C., Gorini, G., Scionti, G., and Schreyer, A.

Published
2020
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7. A magnetically shielded room with ultra low residual field and gradient

Author

Altarev, I., Babcock, E., Beck, D., Burghoff, M., Chesnevskaya, S., Chupp, T., Degenkolb, S., Fan, I., Fierlinger, P., Frei, A., Gutsmiedl, E., Knappe-Grüneberg, S., Kuchler, F., Lauer, T., Link, P., Lins, T., Marino, M., McAndrew, J., Niessen, B., Paul, S., Petzoldt, G., Schläpfer, U., Schnabel, A., Sharma, S., Singh, J., Stoepler, R., Stuiber, S., Sturm, M., Taubenheim, B., Trahms, L., Voigt, J., and Zechlau, T.

Subjects
Physics - Instrumentation and Detectors
Abstract

A versatile and portable magnetically shielded room with a field of (700 \pm 200) pT within a central volume of 1m x 1m x 1m and a field gradient less than 300 pT/m is described. This performance represents more than a hundred-fold improvement of the state of the art for a two-layer magnetic shield and provides an environment suitable for a next generation of precision experiments in fundamental physics at low energies; in particular, searches for electric dipole moments of fundamental systems and tests of Lorentz-invariance based on spin-precession experiments. Studies of the residual fields and their sources enable improved design of future ultra-low gradient environments and experimental apparatus.

Published
2014
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9. Circular Dichroism of RbHe and RbN$_2$ Molecules

Author

Lancor, B., Babcock, E., Wyllie, R., and Walker, T. G.

Subjects
Physics - Atomic Physics
Abstract

We present measurements of the circular dichroism of optically pumped Rb vapor near the D1 resonance line. Collisions with the buffer gases $^3$He and N$_2$ reduce the transparency of the vapor, even when fully polarized. We use two methods to measure this effect, show that the He results can be understood from RbHe potential curves, and show how this effect conspires with the spectral profile of the optical pumping light to increase the laser power demands for optical pumping of very optically thick samples.

Published
2010
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10. Unambiguous determination of structure parameters for soft matter samples made possible with polarization analysis on JCNS SANS using a 3He spin filter

Author

Babcock, E., Ioffe, A., Radulescu, A., and Pipich, V.

Subjects
Physics - Instrumentation and Detectors
Abstract

Incoherent background can create an intrinsic problem for standard small angle neutron scattering measurements. Biological samples contain hydrogen which is a strong incoherent scatterer thus creating an intrinsic source of background that makes determination of the coherent scattering parameters difficult in special situations. This can especially be true for the Q-range from around 0.1-0.5 \AA^-1 where improper knowledge of the background level can lead to ambiguity in determination of the samples structure parameters. Polarization analysis is a way of removing this ambiguity by allowing one to distinguish the coherent from incoherent scattering, even when the coherent scattering is only a small fraction of the total scattered intensity. ^3He spin filters are ideal for accomplishing this task because they permit the analysis of large area and large divergence scattered neutron beams without adding to detector background or changing the prorogation of the scattered neutron beam. This rapid note describes the application of ^3He neutron spin filters, polarized using the spin-exchange optical pumping method, for polarization analysis on a protein sample to unambiguously extract the coherent scattered intensity., Comment: 3 pages, 3 Figures. Early draft of work. To be updated with more data and measurements which will be prepared for journal submission at a later time

Published
2010

11. High level of $^3$He polarization of 81\% Maintained in an on-beam $^3$He spin filter using SEOP

Author

Babcock, E., Mattauch, S., and Ioffe, A.

Subjects
Physics - Instrumentation and Detectors, Physics - Atomic Physics
Abstract

Maintaining high levels of 3He polarization over long periods of time is important to many areas of fundamental and particle beam physics. Long measurement times are often required in such experiments and the data quality is a function of the 3He polarization. This is the case for neutron scattering where the 3He can be used to analyze the spin of a scattered neutron beam and relatively small fluxes of polarized neutrons leads to experiment times longer than several days. Consequently the J\"ulich Centre for Neutron Science (JCNS) is developing spin-exchange optical pumping (SEOP) systems capable of polarizing the 3He gas in place on a typical neutron instrument. Using a polarizer device we constructed a high level of 3He polarization of 81 % \pm2% was maintained with good time stability. Such levels of polarization maintained over time will be able to reduce the measurement times for such experiments and eliminate time dependent data corrections., Comment: 4 pages 2 figures

Published
2010
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12. Breakdown of Angular Momentum Selection Rules in High Pressure Optical Pumping Experiments

Author

Lancor, B., Babcock, E., Wyllie, R., and Walker, T. G.

Subjects
Physics - Atomic Physics
Abstract

We present measurements, using two complementary methods, of the breakdown of atomic angular momentum selection rules in He-broadened Rb vapor. Atomic dark states are rendered weakly absorbing due to fine-structure mixing during Rb-He collisions. The effect substantially increases the photon demand for optical pumping of dense vapors.

Published
2010
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14. Neutron Beam Effects on Spin Exchange Polarized He-3

Author

Sharma, M., Babcock, E., Andersen, K. H., Barron-Palos, L., Becker, M., Boag, S., Chen, W. C., Chupp, T. E., Danagoulian, A., Gentile, T. R., Klein, A., Penttila, S., Petoukhov, A., Soldner, T., Tardiff, E. R., Walker, T. G., and Wilburn, W. S.

Subjects
Nuclear Experiment
Abstract

We have observed depolarization effects when high intensity cold neutron beams are incident on alkali-metal-spin-exchange polarized He-3 cells used as neutron spin filters. This was first observed as a reduction of the maximum attainable He-3 polarization and was attributed to a decrease of alkali-metal polarization, which led us to directly measure alkali-metal polarization and spin relaxation over a range of neutron fluxes at LANSCE and ILL. The data reveal a new alkali-metal spin-relaxation mechanism that approximately scales as the square root of the neutron capture-flux density incident on the cell. This is consistent with an effect proportional to the recombination-limited ion concentration, but is much larger than expected from earlier work., Comment: submitted to Physical Review Letters

Published
2008
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16. Recombinant Human Alpha-1 Antitrypsin (AAT) Protein INBRX-101 Demonstrates Potential to Achieve Lung Penetration and Normal Functional Serum AAT Levels in Patients With AAT Deficiency

Author

Kuhn, B.T., primary, Veale, A., additional, Farah, H., additional, Mahadeva, R., additional, Chang, C.L., additional, Brown, C.D., additional, Campos, M.A., additional, Lascano, J., additional, Bhagwat, S., additional, Boyea, T., additional, Babcock, E., additional, Veldstra, C., additional, Andrianov, V., additional, Kalabus, J., additional, Eckelman, B., additional, and Brantly, M.L., additional

Published
2023
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17. in-situ3He neutron spin filters at JCNS, status and updates

Author

Babcock, E. (author), Salhi, Z. (author), Feoktystov, A. (author), Bannenberg, L.J. (author), Parnell, S.R. (author), Alba Venero, D. (author), Hutanu, V. (author), Thoma, H. (author), Xu, J. (author), Babcock, E. (author), Salhi, Z. (author), Feoktystov, A. (author), Bannenberg, L.J. (author), Parnell, S.R. (author), Alba Venero, D. (author), Hutanu, V. (author), Thoma, H. (author), and Xu, J. (author)

Abstract

The JCNS has been developing and using in-situ polarized neutron spin filters for many applications. The system used for analysis on MARIA and polarization for TOPAS were completed about 10 years ago with the MARIA system in standard operation for users and the TOPAS system employed for a long measurement on the POLI instrument. In the meantime we are progressing on several new in-situ polarizers based on these first two but with additional innovations. The KWS-1 analyzer device which was recently used in tests at TU Delft and ISIS is essentially a 50%-sized copy of the MARIA device. The two devices in construction for polarization and analysis on POLI for hot neutrons feature magic-boxes with angled plates on both the entrance and exit sides to minimize overal length and the polarizer device will employ an additional passive magnetic shield of soft iron so that it can operate inside the stray field area of a 8-T vertical (compensated) sample magnet. We will summarize the current status of our 3He neutron spin filters and provide extra focus on the technical aspects and measured performance characteristics of the new devices for KWS-1 and POLI in particular., RID/TS/Instrumenten groep

Published
2023
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18. in-situ 3He neutron spin filters at JCNS, status and updates

Author

Babcock, E., primary, Salhi, Z., additional, Feoktystov, A., additional, Bannenberg, L.J., additional, Parnell, S.R., additional, Alba Venero, D., additional, Hutanu, V, additional, Thoma, H., additional, Xu, J., additional, Pistel, P., additional, Damean, J., additional, Ioffe, A., additional, and Mattauch, S., additional

Published
2023
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19. A new search for the atomic EDM of 129Xe at FRM-II

Author

Kuchler, F., Babcock, E., Burghoff, M., Chupp, T., Degenkolb, S., Fan, I., Fierlinger, P., Gong, F., Kraegeloh, E., Kilian, W., Knappe-Grüneberg, S., Lins, T., Marino, M., Meinel, J., Niessen, B., Sachdeva, N., Salhi, Z., Schnabel, A., Seifert, F., Singh, J., Stuiber, S., Trahms, L., and Voigt, J.

Published
2016
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25. The instrument suite of the European Spallation Source

Author

Andersen, K, Argyriou, D, Jackson, A, Houston, J, Henry, P, Deen, P, Toft-Petersen, R, Beran, P, Strobl, M, Arnold, T, Wacklin-Knecht, H, Tsapatsaris, N, Oksanen, E, Woracek, R, Schweika, W, Mannix, D, Hiess, A, Kennedy, S, Kirstein, O, Petersson Arskold, S, Taylor, J, Hagen, M, Laszlo, G, Kanaki, K, Piscitelli, F, Khaplanov, A, Stefanescu, I, Kittelmann, T, Pfeiffer, D, Hall-Wilton, R, Lopez, C, Aprigliano, G, Whitelegg, L, Moreira, F, Olsson, M, Bordallo, H, Martin-Rodriguez, D, Schneider, H, Sharp, M, Hartl, M, Nagy, G, Ansell, S, Pullen, S, Vickery, A, Fedrigo, A, Mezei, F, Arai, M, Heenan, R, Halcrow, W, Turner, D, Raspino, D, Orszulik, A, Cooper, J, Webb, N, Galsworthy, P, Nightingale, J, Langridge, S, Elmer, J, Frielinghaus, H, Hanslik, R, Gussen, A, Jaksch, S, Engels, R, Kozielewski, T, Butterweck, S, Feygenson, M, Harbott, P, Poque, A, Schwaab, A, Lieutenant, K, Violini, N, Voigt, J, Bruckel, T, Koenen, M, Kammerling, H, Babcock, E, Salhi, Z, Wischnewski, A, Heynen, A, Desert, S, Jestin, J, Porcher, F, Fabreges, X, Fabreges, G, Annighofer, B, Klimko, S, Dupont, T, Robillard, T, Goukassov, A, Longeville, S, Alba-Simionesco, C, Bourges, P, Guyon Le Bouffy, J, Lavie, P, Rodrigues, S, Calzada, E, Lerche, M, Schillinger, B, Schmakat, P, Schulz, M, Seifert, M, Lohstroh, W, Petry, W, Neuhaus, J, Loaiza, L, Tartaglione, A, Glavic, A, Schutz, S, Stahn, J, Lehmann, E, Morgano, M, Schefer, J, Filges, U, Klauser, C, Niedermayer, C, Fenske, J, Nowak, G, Rouijaa, M, Siemers, D, Kiehn, R, Muller, M, Carlsen, H, Udby, L, Lefmann, K, Birk, J, Holm-Dahlin, S, Bertelsen, M, Hansen, U, Olsen, M, Christensen, M, Iversen, K, Christensen, N, Ronnow, H, Freeman, P, Hauback, B, Kolevatov, R, Llamas-Jansa, I, Orecchini, A, Sacchetti, F, Petrillo, C, Paciaroni, A, Tozzi, P, Zanatta, M, Luna, P, Herranz, I, del Moral, O, Huerta, M, Magan, M, Mosconi, M, Abad, E, Aguilar, J, Stepanyan, S, Bakedano, G, Vivanco, R, Bustinduy, I, Sordo, F, Martinez, J, Lechner, R, Villacorta, F, Saroun, J, Lukas, P, Marko, M, Zanetti, M, Bellissima, S, del Rosso, L, Masi, F, Bovo, C, Chowdhury, M, De Bonis, A, Di Fresco, L, Scatigno, C, Parker, S, Fernandez-Alonso, F, Colognesi, D, Senesi, R, Andreani, C, Gorini, G, Scionti, G, Schreyer, A, Andersen K. H., Argyriou D. N., Jackson A. J., Houston J., Henry P. F., Deen P. P., Toft-Petersen R., Beran P., Strobl M., Arnold T., Wacklin-Knecht H., Tsapatsaris N., Oksanen E., Woracek R., Schweika W., Mannix D., Hiess A., Kennedy S., Kirstein O., Petersson Arskold S., Taylor J., Hagen M. E., Laszlo G., Kanaki K., Piscitelli F., Khaplanov A., Stefanescu I., Kittelmann T., Pfeiffer D., Hall-Wilton R., Lopez C. I., Aprigliano G., Whitelegg L., Moreira F. Y., Olsson M., Bordallo H. N., Martin-Rodriguez D., Schneider H., Sharp M., Hartl M., Nagy G., Ansell S., Pullen S., Vickery A., Fedrigo A., Mezei F., Arai M., Heenan R. K., Halcrow W., Turner D., Raspino D., Orszulik A., Cooper J., Webb N., Galsworthy P., Nightingale J., Langridge S., Elmer J., Frielinghaus H., Hanslik R., Gussen A., Jaksch S., Engels R., Kozielewski T., Butterweck S., Feygenson M., Harbott P., Poque A., Schwaab A., Lieutenant K., Violini N., Voigt J., Bruckel T., Koenen M., Kammerling H., Babcock E., Salhi Z., Wischnewski A., Heynen A., Desert S., Jestin J., Porcher F., Fabreges X., Fabreges G., Annighofer B., Klimko S., Dupont T., Robillard T., Goukassov A., Longeville S., Alba-Simionesco C., Bourges P., Guyon Le Bouffy J., Lavie P., Rodrigues S., Calzada E., Lerche M., Schillinger B., Schmakat P., Schulz M., Seifert M., Lohstroh W., Petry W., Neuhaus J., Loaiza L., Tartaglione A., Glavic A., Schutz S., Stahn J., Lehmann E., Morgano M., Schefer J., Filges U., Klauser C., Niedermayer C., Fenske J., Nowak G., Rouijaa M., Siemers D. J., Kiehn R., Muller M., Carlsen H., Udby L., Lefmann K., Birk J. O., Holm-Dahlin S., Bertelsen M., Hansen U. B., Olsen M. A., Christensen M., Iversen K., Christensen N. B., Ronnow H. M., Freeman P. G., Hauback B. C., Kolevatov R., Llamas-Jansa I., Orecchini A., Sacchetti F., Petrillo C., Paciaroni A., Tozzi P., Zanatta M., Luna P., Herranz I., del Moral O. G., Huerta M., Magan M., Mosconi M., Abad E., Aguilar J., Stepanyan S., Bakedano G., Vivanco R., Bustinduy I., Sordo F., Martinez J. L., Lechner R. E., Villacorta F. J., Saroun J., Lukas P., Marko M., Zanetti M., Bellissima S., del Rosso L., Masi F., Bovo C., Chowdhury M., De Bonis A., Di Fresco L., Scatigno C., Parker S. F., Fernandez-Alonso F., Colognesi D., Senesi R., Andreani C., Gorini G., Scionti G., Schreyer A., Andersen, K, Argyriou, D, Jackson, A, Houston, J, Henry, P, Deen, P, Toft-Petersen, R, Beran, P, Strobl, M, Arnold, T, Wacklin-Knecht, H, Tsapatsaris, N, Oksanen, E, Woracek, R, Schweika, W, Mannix, D, Hiess, A, Kennedy, S, Kirstein, O, Petersson Arskold, S, Taylor, J, Hagen, M, Laszlo, G, Kanaki, K, Piscitelli, F, Khaplanov, A, Stefanescu, I, Kittelmann, T, Pfeiffer, D, Hall-Wilton, R, Lopez, C, Aprigliano, G, Whitelegg, L, Moreira, F, Olsson, M, Bordallo, H, Martin-Rodriguez, D, Schneider, H, Sharp, M, Hartl, M, Nagy, G, Ansell, S, Pullen, S, Vickery, A, Fedrigo, A, Mezei, F, Arai, M, Heenan, R, Halcrow, W, Turner, D, Raspino, D, Orszulik, A, Cooper, J, Webb, N, Galsworthy, P, Nightingale, J, Langridge, S, Elmer, J, Frielinghaus, H, Hanslik, R, Gussen, A, Jaksch, S, Engels, R, Kozielewski, T, Butterweck, S, Feygenson, M, Harbott, P, Poque, A, Schwaab, A, Lieutenant, K, Violini, N, Voigt, J, Bruckel, T, Koenen, M, Kammerling, H, Babcock, E, Salhi, Z, Wischnewski, A, Heynen, A, Desert, S, Jestin, J, Porcher, F, Fabreges, X, Fabreges, G, Annighofer, B, Klimko, S, Dupont, T, Robillard, T, Goukassov, A, Longeville, S, Alba-Simionesco, C, Bourges, P, Guyon Le Bouffy, J, Lavie, P, Rodrigues, S, Calzada, E, Lerche, M, Schillinger, B, Schmakat, P, Schulz, M, Seifert, M, Lohstroh, W, Petry, W, Neuhaus, J, Loaiza, L, Tartaglione, A, Glavic, A, Schutz, S, Stahn, J, Lehmann, E, Morgano, M, Schefer, J, Filges, U, Klauser, C, Niedermayer, C, Fenske, J, Nowak, G, Rouijaa, M, Siemers, D, Kiehn, R, Muller, M, Carlsen, H, Udby, L, Lefmann, K, Birk, J, Holm-Dahlin, S, Bertelsen, M, Hansen, U, Olsen, M, Christensen, M, Iversen, K, Christensen, N, Ronnow, H, Freeman, P, Hauback, B, Kolevatov, R, Llamas-Jansa, I, Orecchini, A, Sacchetti, F, Petrillo, C, Paciaroni, A, Tozzi, P, Zanatta, M, Luna, P, Herranz, I, del Moral, O, Huerta, M, Magan, M, Mosconi, M, Abad, E, Aguilar, J, Stepanyan, S, Bakedano, G, Vivanco, R, Bustinduy, I, Sordo, F, Martinez, J, Lechner, R, Villacorta, F, Saroun, J, Lukas, P, Marko, M, Zanetti, M, Bellissima, S, del Rosso, L, Masi, F, Bovo, C, Chowdhury, M, De Bonis, A, Di Fresco, L, Scatigno, C, Parker, S, Fernandez-Alonso, F, Colognesi, D, Senesi, R, Andreani, C, Gorini, G, Scionti, G, Schreyer, A, Andersen K. H., Argyriou D. N., Jackson A. J., Houston J., Henry P. F., Deen P. P., Toft-Petersen R., Beran P., Strobl M., Arnold T., Wacklin-Knecht H., Tsapatsaris N., Oksanen E., Woracek R., Schweika W., Mannix D., Hiess A., Kennedy S., Kirstein O., Petersson Arskold S., Taylor J., Hagen M. E., Laszlo G., Kanaki K., Piscitelli F., Khaplanov A., Stefanescu I., Kittelmann T., Pfeiffer D., Hall-Wilton R., Lopez C. I., Aprigliano G., Whitelegg L., Moreira F. Y., Olsson M., Bordallo H. N., Martin-Rodriguez D., Schneider H., Sharp M., Hartl M., Nagy G., Ansell S., Pullen S., Vickery A., Fedrigo A., Mezei F., Arai M., Heenan R. K., Halcrow W., Turner D., Raspino D., Orszulik A., Cooper J., Webb N., Galsworthy P., Nightingale J., Langridge S., Elmer J., Frielinghaus H., Hanslik R., Gussen A., Jaksch S., Engels R., Kozielewski T., Butterweck S., Feygenson M., Harbott P., Poque A., Schwaab A., Lieutenant K., Violini N., Voigt J., Bruckel T., Koenen M., Kammerling H., Babcock E., Salhi Z., Wischnewski A., Heynen A., Desert S., Jestin J., Porcher F., Fabreges X., Fabreges G., Annighofer B., Klimko S., Dupont T., Robillard T., Goukassov A., Longeville S., Alba-Simionesco C., Bourges P., Guyon Le Bouffy J., Lavie P., Rodrigues S., Calzada E., Lerche M., Schillinger B., Schmakat P., Schulz M., Seifert M., Lohstroh W., Petry W., Neuhaus J., Loaiza L., Tartaglione A., Glavic A., Schutz S., Stahn J., Lehmann E., Morgano M., Schefer J., Filges U., Klauser C., Niedermayer C., Fenske J., Nowak G., Rouijaa M., Siemers D. J., Kiehn R., Muller M., Carlsen H., Udby L., Lefmann K., Birk J. O., Holm-Dahlin S., Bertelsen M., Hansen U. B., Olsen M. A., Christensen M., Iversen K., Christensen N. B., Ronnow H. M., Freeman P. G., Hauback B. C., Kolevatov R., Llamas-Jansa I., Orecchini A., Sacchetti F., Petrillo C., Paciaroni A., Tozzi P., Zanatta M., Luna P., Herranz I., del Moral O. G., Huerta M., Magan M., Mosconi M., Abad E., Aguilar J., Stepanyan S., Bakedano G., Vivanco R., Bustinduy I., Sordo F., Martinez J. L., Lechner R. E., Villacorta F. J., Saroun J., Lukas P., Marko M., Zanetti M., Bellissima S., del Rosso L., Masi F., Bovo C., Chowdhury M., De Bonis A., Di Fresco L., Scatigno C., Parker S. F., Fernandez-Alonso F., Colognesi D., Senesi R., Andreani C., Gorini G., Scionti G., and Schreyer A.

Abstract

An overview is provided of the 15 neutron beam instruments making up the initial instrument suite of the European Spallation Source (ESS), and being made available to the neutron user community. The ESS neutron source consists of a high-power accelerator and target station, providing a unique long-pulse time structure of slow neutrons. The design considerations behind the time structure, moderator geometry and instrument layout are presented. The 15-instrument suite consists of two small-angle instruments, two reflectometers, an imaging beamline, two single-crystal diffractometers; one for macromolecular crystallography and one for magnetism, two powder diffractometers, and an engineering diffractometer, as well as an array of five inelastic instruments comprising two chopper spectrometers, an inverse-geometry single-crystal excitations spectrometer, an instrument for vibrational spectroscopy and a high-resolution backscattering spectrometer. The conceptual design, performance and scientific drivers of each of these instruments are described. All of the instruments are designed to provide breakthrough new scientific capability, not currently available at existing facilities, building on the inherent strengths of the ESS long-pulse neutron source of high flux, flexible resolution and large bandwidth. Each of them is predicted to provide world-leading performance at an accelerator power of 2 MW. This technical capability translates into a very broad range of scientific capabilities. The composition of the instrument suite has been chosen to maximise the breadth and depth of the scientific impact of the early years of the ESS, and provide a solid base for completion and further expansion of the facility.

Published
2020

37. Effect of rotation in the γ -ray emission from 60 meV polarized neutron-induced fission of the U 235 isotope

Author

Berikov, D., Ahmadov, G., Klenke, J., Hutanu, V., Kopatch, Yu., Gagarski, A., Novitsky, V., Deng, H., Danilyan, G., Masalovich, S., Salhi, Zahir, and Babcock, E.

Subjects
ddc:530, Nuclear Experiment
Abstract

In the paper we present the results obtained for the effect of rotation (ROT) in the angular distribution of prompt γ rays from the fission of 235U induced by monochromatic polarized “warm” neutrons (En = 60 meV). The polarization vector direction is determined at the target position in order to correctly determine the sign of the measured effect. The asymmetry parameter was found to be equal to Rγ=−(17.3±2.8)×10−5. Moreover, the rotation angle of the fission axis was determined to be equal to 0.069°±0.008° taking into account the fit results of the angular distribution of the prompt fission γ rays. The obtained value and sign of the ROT effect are consistent with the results of the ROT effect obtained for cold neutrons. We describe the experiment, methodology of sign determination, and implications of the results

Published
2021
Full Text
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40. The genus Youngia

Author

Babcock, E. B. (Ernest Brown), 1877-1954, Stebbins, G Ledyard, Jr., (George Ledyard), 1906-2000, Smithsonian Libraries and Archives, Babcock, E. B. (Ernest Brown), 1877-1954, and Stebbins, G Ledyard, Jr., (George Ledyard), 1906-2000

Subjects
Youngia
Published
1937

42. Chromosomes and phylogeny in Crepis,

Author

Hollingshead, Lillian, 1900, Babcock, E. B. (Ernest Brown), 1877-1954, University of California, Davis Libraries (archive.org), Hollingshead, Lillian, 1900, and Babcock, E. B. (Ernest Brown), 1877-1954

Subjects
Chromosomes, Crepis, Phylogeny, Plants
Published
1930

44. Interspecific hybrids Crepis /

Author

Babcock, E. B. (Ernest Brown), 1877-1954, Collins, J. L. (Julius Lloyd), University of California, Davis Libraries (archive.org), Babcock, E. B. (Ernest Brown), 1877-1954, and Collins, J. L. (Julius Lloyd)

Subjects
Crepis capillaris, Heredity, Plant hybridization
Published
1920

46. Chromosome number and individuality in the genus Crepis,

Author

Lesley, Margaret Campbell Mann, 1891-1988, Babcock, E. B. (Ernest Brown), 1877-1954, University of California, Davis Libraries (archive.org), Lesley, Margaret Campbell Mann, 1891-1988, and Babcock, E. B. (Ernest Brown), 1877-1954

Subjects
Crepis, Karyokinesis
Published
1925

47. Genetics in relation to agriculture,

Author

Babcock, E. B. (Ernest Brown), 1877-1954, Clausen, Roy Elwood, 1891, Library of Congress, Babcock, E. B. (Ernest Brown), 1877-1954, and Clausen, Roy Elwood, 1891

Subjects
Heredity, Livestock, Plant breeding, Variation (Biology)
Published
1918

48. Polarized [.sup.3]He spin filters for slow neutron physics

Author

Gentile, T.R., Chen, W.C., Jones, G.L., Babcock, E., and Walker, T.G.

Subjects
Polarization (Nuclear physics) -- Usage -- Research, Neutrons -- Research -- Atomic properties -- Usage
Abstract

Polarized [.sup.3]He spin filters are needed for a variety of experiments with slow neutrons. Their demonstrated utility for highly accurate determination of neutron polarization are critical to the next generation […]

Published
2005

49. The genus Youngia

Author

Babcock, E. B. (Ernest Brown), 1877-1954, Stebbins, G Ledyard, Jr., (George Ledyard), 1906-2000, Smithsonian Libraries and Archives, Babcock, E. B. (Ernest Brown), 1877-1954, and Stebbins, G Ledyard, Jr., (George Ledyard), 1906-2000

Subjects
Youngia

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