A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission

D. C. Schaper; C. Auton; L. Barrón-Palos; M. Borrego; A. Chavez; L. Cole; C. B. Crawford; J. Curole; H. Dhahri; K. A. Dickerson; J. Doskow; W. Fox; M. H. Gervais; B. M. Goodson; K. Knickerbocker; C. Jiang; P. M. King; H. Lu; M. Mocko; D. Olivera-Velarde; J. G. Otero Munoz; S. I. Penttilä; A. Pérez-Martín; B. Short; W. M. Snow; K. Steffen; J. Vanderwerp; G. Visser

doi:10.1016/j.nima.2020.163961

A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission

D. C. Schaper, C. Auton, L. Barrón-Palos, M. Borrego, A. Chavez, L. Cole, C. B. Crawford, J. Curole, H. Dhahri, K. A. Dickerson, J. Doskow, W. Fox, M. H. Gervais, B. M. Goodson, K. Knickerbocker, C. Jiang, P. M. King, H. Lu, M. Mocko, D. Olivera-VelardeJ. G. Otero Munoz, S. I. Penttilä, A. Pérez-Martín, B. Short, W. M. Snow, K. Steffen, J. Vanderwerp, G. Visser

Neutron Optics & Polarization

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6 Scopus citations

Abstract

We describe a modular apparatus for use in parity-violation measurements in epithermal neutron–nucleus resonances with high instantaneous neutron fluxes at the Manuel Lujan Jr. Neutron Scattering Center at Los Alamos National Laboratory. This apparatus is designed to conduct high-precision measurements of the parity-odd transmission asymmetry of longitudinally polarized neutrons through targets containing nuclei with p-wave neutron–nucleus resonances in the 0.1–10 eV energy regime and to accommodate a future search for time reversal violation in polarized neutron transmission through polarized nuclear targets. The apparatus consists of an adjustable neutron and gamma collimation system, a ³He-⁴He ion chamber neutron flux monitor, two identical cryostats for target cooling, an adiabatic eV-neutron spin flipper, a near-unit efficiency ⁶Li-⁷Li scintillation detector operated in current mode, a flexible CAEN data acquisition system, and a neutron spin filter based on spin-exchange optical pumping of ³He gas. We describe the features of the apparatus design devoted to the suppression of systematic errors in parity-odd asymmetry measurements. We describe the configuration of the apparatus used to conduct a precision measurement of parity violation at the 0.7 eV p-wave resonance in ¹³⁹La which employs two identical ¹³⁹La targets, one to polarize the beam on the p-wave resonance using the weak interaction and one to analyze the polarization.

Original language	English
Article number	163961
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	969
DOIs	https://doi.org/10.1016/j.nima.2020.163961
State	Published - Jul 21 2020

Funding

This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Award Number DE-SC-0014622. D. Schaper would also like to acknowledge support by the National Science Foundation Graduate Research Fellowship Program, USA under Grant Number 1247392. The work of C. Auton, J. Curole, J. Doskow, W. Fox, H. Lu, W. M. Snow. K. Steffen, J Vanderwerp, B. Short, and G. Visser was supported by NSF, USAPHY-1614545, NSF, USAPHY-1913789, and the Indiana University Center for Spacetime Symmetries. J. Curole also acknowledges support from the GAANN fellowship program of the US Department of Education and the Department of Energy SCGSR program, USA. L. Cole and D. Olivera would like to acknowledge funding from the KY-NSF EPSCoR Research Scholar Program. B.M. Goodson acknowledges funding from NSF, USA (CHE-1905341), DoD, USA (W81XWH-15-1-0272), and a Cottrell SEED Award from the Research Corporation for Science Advancement. We gratefully acknowledge the local support of the LANSCE neutron facility at Los Alamos National Lab where this measurement was performed. Test measurements for the current mode detector electronics used for this work were conducted in part on the NOBORU instrument at the JPARC MLF through proposal 2016B0021, Characterization of High Counting Rate Epithermal Neutron Detectors

Keywords

Fundamental symmetry
Neutron resonance
Parity violation
Scintillator detector
Time reversal violation

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10.1016/j.nima.2020.163961

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Schaper, D. C., Auton, C., Barrón-Palos, L., Borrego, M., Chavez, A., Cole, L., Crawford, C. B., Curole, J., Dhahri, H., Dickerson, K. A., Doskow, J., Fox, W., Gervais, M. H., Goodson, B. M., Knickerbocker, K., Jiang, C., King, P. M., Lu, H., Mocko, M., ... Visser, G. (2020). A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 969, Article 163961. https://doi.org/10.1016/j.nima.2020.163961

@article{397c8965211949baafe4d67f40e0256d,

title = "A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission",

abstract = "We describe a modular apparatus for use in parity-violation measurements in epithermal neutron–nucleus resonances with high instantaneous neutron fluxes at the Manuel Lujan Jr. Neutron Scattering Center at Los Alamos National Laboratory. This apparatus is designed to conduct high-precision measurements of the parity-odd transmission asymmetry of longitudinally polarized neutrons through targets containing nuclei with p-wave neutron–nucleus resonances in the 0.1–10 eV energy regime and to accommodate a future search for time reversal violation in polarized neutron transmission through polarized nuclear targets. The apparatus consists of an adjustable neutron and gamma collimation system, a 3He-4He ion chamber neutron flux monitor, two identical cryostats for target cooling, an adiabatic eV-neutron spin flipper, a near-unit efficiency 6Li-7Li scintillation detector operated in current mode, a flexible CAEN data acquisition system, and a neutron spin filter based on spin-exchange optical pumping of 3He gas. We describe the features of the apparatus design devoted to the suppression of systematic errors in parity-odd asymmetry measurements. We describe the configuration of the apparatus used to conduct a precision measurement of parity violation at the 0.7 eV p-wave resonance in 139La which employs two identical 139La targets, one to polarize the beam on the p-wave resonance using the weak interaction and one to analyze the polarization.",

keywords = "Fundamental symmetry, Neutron resonance, Parity violation, Scintillator detector, Time reversal violation",

author = "Schaper, \{D. C.\} and C. Auton and L. Barr{\'o}n-Palos and M. Borrego and A. Chavez and L. Cole and Crawford, \{C. B.\} and J. Curole and H. Dhahri and Dickerson, \{K. A.\} and J. Doskow and W. Fox and Gervais, \{M. H.\} and Goodson, \{B. M.\} and K. Knickerbocker and C. Jiang and King, \{P. M.\} and H. Lu and M. Mocko and D. Olivera-Velarde and \{Otero Munoz\}, \{J. G.\} and Penttil{\"a}, \{S. I.\} and A. P{\'e}rez-Mart{\'i}n and B. Short and Snow, \{W. M.\} and K. Steffen and J. Vanderwerp and G. Visser",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2020",

month = jul,

day = "21",

doi = "10.1016/j.nima.2020.163961",

language = "English",

volume = "969",

journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",

issn = "0168-9002",

publisher = "Elsevier",

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Schaper, DC, Auton, C, Barrón-Palos, L, Borrego, M, Chavez, A, Cole, L, Crawford, CB, Curole, J, Dhahri, H, Dickerson, KA, Doskow, J, Fox, W, Gervais, MH, Goodson, BM, Knickerbocker, K, Jiang, C, King, PM, Lu, H, Mocko, M, Olivera-Velarde, D, Otero Munoz, JG, Penttilä, SI, Pérez-Martín, A, Short, B, Snow, WM, Steffen, K, Vanderwerp, J & Visser, G 2020, 'A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 969, 163961. https://doi.org/10.1016/j.nima.2020.163961

A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission. / Schaper, D. C.; Auton, C.; Barrón-Palos, L. et al.
In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 969, 163961, 21.07.2020.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission

AU - Schaper, D. C.

AU - Auton, C.

AU - Barrón-Palos, L.

AU - Borrego, M.

AU - Chavez, A.

AU - Cole, L.

AU - Crawford, C. B.

AU - Curole, J.

AU - Dhahri, H.

AU - Dickerson, K. A.

AU - Doskow, J.

AU - Fox, W.

AU - Gervais, M. H.

AU - Goodson, B. M.

AU - Knickerbocker, K.

AU - Jiang, C.

AU - King, P. M.

AU - Lu, H.

AU - Mocko, M.

AU - Olivera-Velarde, D.

AU - Otero Munoz, J. G.

AU - Penttilä, S. I.

AU - Pérez-Martín, A.

AU - Short, B.

AU - Snow, W. M.

AU - Steffen, K.

AU - Vanderwerp, J.

AU - Visser, G.

PY - 2020/7/21

Y1 - 2020/7/21

N2 - We describe a modular apparatus for use in parity-violation measurements in epithermal neutron–nucleus resonances with high instantaneous neutron fluxes at the Manuel Lujan Jr. Neutron Scattering Center at Los Alamos National Laboratory. This apparatus is designed to conduct high-precision measurements of the parity-odd transmission asymmetry of longitudinally polarized neutrons through targets containing nuclei with p-wave neutron–nucleus resonances in the 0.1–10 eV energy regime and to accommodate a future search for time reversal violation in polarized neutron transmission through polarized nuclear targets. The apparatus consists of an adjustable neutron and gamma collimation system, a 3He-4He ion chamber neutron flux monitor, two identical cryostats for target cooling, an adiabatic eV-neutron spin flipper, a near-unit efficiency 6Li-7Li scintillation detector operated in current mode, a flexible CAEN data acquisition system, and a neutron spin filter based on spin-exchange optical pumping of 3He gas. We describe the features of the apparatus design devoted to the suppression of systematic errors in parity-odd asymmetry measurements. We describe the configuration of the apparatus used to conduct a precision measurement of parity violation at the 0.7 eV p-wave resonance in 139La which employs two identical 139La targets, one to polarize the beam on the p-wave resonance using the weak interaction and one to analyze the polarization.

AB - We describe a modular apparatus for use in parity-violation measurements in epithermal neutron–nucleus resonances with high instantaneous neutron fluxes at the Manuel Lujan Jr. Neutron Scattering Center at Los Alamos National Laboratory. This apparatus is designed to conduct high-precision measurements of the parity-odd transmission asymmetry of longitudinally polarized neutrons through targets containing nuclei with p-wave neutron–nucleus resonances in the 0.1–10 eV energy regime and to accommodate a future search for time reversal violation in polarized neutron transmission through polarized nuclear targets. The apparatus consists of an adjustable neutron and gamma collimation system, a 3He-4He ion chamber neutron flux monitor, two identical cryostats for target cooling, an adiabatic eV-neutron spin flipper, a near-unit efficiency 6Li-7Li scintillation detector operated in current mode, a flexible CAEN data acquisition system, and a neutron spin filter based on spin-exchange optical pumping of 3He gas. We describe the features of the apparatus design devoted to the suppression of systematic errors in parity-odd asymmetry measurements. We describe the configuration of the apparatus used to conduct a precision measurement of parity violation at the 0.7 eV p-wave resonance in 139La which employs two identical 139La targets, one to polarize the beam on the p-wave resonance using the weak interaction and one to analyze the polarization.

KW - Fundamental symmetry

KW - Neutron resonance

KW - Parity violation

KW - Scintillator detector

KW - Time reversal violation

UR - https://www.scopus.com/pages/publications/85083517771

U2 - 10.1016/j.nima.2020.163961

DO - 10.1016/j.nima.2020.163961

M3 - Article

AN - SCOPUS:85083517771

SN - 0168-9002

VL - 969

JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

M1 - 163961

ER -

Schaper DC, Auton C, Barrón-Palos L, Borrego M, Chavez A, Cole L et al. A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2020 Jul 21;969:163961. doi: 10.1016/j.nima.2020.163961

A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission

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Keywords

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