Design of the magnet system of the neutron decay facility PERC

Wang, Xiangzun; Ziener, Carmen; Abele, H.; Bodmaier, Stefan; Dubbers, D.; Erhart, Jaqueline; Hollering, A.; Jericha, E.; Klenke, J.; Fillunger, H.; Heil, W.; Klauser, Christine; Konrad, Gertrud; Lamparth, Max; Lauer, T.; Klopf, Michael; Maix, R.; Märkisch, Bastian; Mach, Wilfried; Mest, Holger; Moser, Danielle E.; Pethoukov, Alexander; Raffelt, Lukas Michael; Rebrova, N.V.; Roick, Christoph; Saul, Heiko; Schmidt, Ulrich; Söldner, T.; Virot, R.; Zimmer, O.

doi:10.1051/epjconf/201921904007

Cited by 21 publications

(16 citation statements)

References 42 publications

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“…[17] for more discussions). Future improvements are expected from the Nab [18] and PERC [19,20] collaborations, both aiming at an accuracy level of 10 −4 .…”

Section: Jhep10(2021)053mentioning

confidence: 99%

Dispersion relation analysis of the radiative corrections to gA in the neutron β-decay

Seng

2021

J. High Energ. Phys.

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We present the first and complete dispersion relation analysis of the inner radiative corrections to the axial coupling constant gA in the neutron β-decay. Using experimental inputs from the elastic form factors and the spin-dependent structure function g1, we determine the contribution from the γW-box diagram to a precision better than 10−4. Our calculation indicates that the inner radiative corrections to the Fermi and the Gamow-Teller matrix element in the neutron β-decay are almost identical, i.e. the ratio λ = gA/gV is almost unrenormalized. With this result, we predict the bare axial coupling constant to be $$ {\overset{\circ }{g}}_A=-1.2754{(13)}_{\mathrm{exp}}{(2)}_{\mathrm{RC}} $$ g ∘ A = − 1.2754 13 exp 2 RC based on the PDG average λ = −1.2756(13).

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“…[17] for more discussions). Future improvements are expected from the Nab [18] and PERC [19,20] collaborations, both aiming at an accuracy level of 10 −4 .…”

Section: Jhep10(2021)053mentioning

confidence: 99%

Dispersion relation analysis of the radiative corrections to gA in the neutron β-decay

Seng

2021

J. High Energ. Phys.

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“…A removable 3 He spin filter serves to check its proper function if necessary. Finally the vertical magnetic guide field is rotated adiabatically into the horizontal beam direction, so that the neutron polarization is transferred without any losses into the strong ( ≃ 1.5 T) horizontal magnetic field produced by a superconducting soleneoid within the 8 m long decay region of PERC 27 . The cross-section of the cold neutron guide within that region is 6 × 6 cm 2 .…”

Section: Discussionmentioning

confidence: 99%

“…www.nature.com/scientificreports www.nature.com/scientificreports/ region towards the detectors 27 . If necessary, further magnetic spectrometers can be installed in front of the detectors, with an example given in 57,58 .…”

Section: Discussionmentioning

confidence: 99%

“…The related topics cover the measurement of correlation coefficients [1][2][3] , the calculations of radiative corrections [4][5][6][7] , unitarity of the quark-mixing CKM matrix 7,8 , the probing of New Physics [9][10][11] , the flavor composition of astrophysical neutrinos 12 , and the so-called neutron lifetime puzzle or neutron decay anomaly 13 in the context of Dark Matter [14][15][16][17][18][19][20][21] , baryon number violation [22][23][24] , or the Quantum Zeno effect 25,26 . In this publication we introduce a neutron resonance system which has been developed for the purpose of an advanced and flexible neutron beam tailoring at the PERC facility 27 in the context of high-precision neutron beta decay experiments.…”

Section: Monopol -A Traveling-wave Magnetic Neutron Spin Resonator Fomentioning

confidence: 99%

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MONOPOL - A traveling-wave magnetic neutron spin resonator for tailoring polarized neutron beams

Jericha¹,

Gösselsberger²,

Abele³

et al. 2020

Sci Rep

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time resolution will no longer be limited by the total length of the resonator but only by that of one half-period, without any deterioration of the achievable wavelength resolution. An appealing feature of this novel concept is that in principle both of these resolutions can be changed not only separately but also almost instantaneously by purely electronic means, provided an appropriate, inevitably rather complex circuitry is used for this purpose. In recent years we have developed several prototypes of neutron spin resonators with independent elements, able to be operated in such a traveling-wave mode. The first experimental tests at the 250 kW low flux TRIGA research reactor of our university in Vienna could be performed only with a dichromatic beam of thermal neutrons delivered from 1 st and 2 nd order (002)-reflection of a highly oriented pyrolytic graphite (HOPG) monochromator. Nevertheless these experiments allowed us to improve the resonator performance step-by-step from one prototype to the next and to demonstrate that our proposed concept is indeed useful for flexible neutron beam property tailoring. The most advanced of these prototypes, named MONOPOL 3.1, was designed and optimized for installation at the PF2-VCN beam line at the high-flux reactor of the ILL Grenoble, where it could be tested for the first time with a 'white' neutron beam, in this specific case of very cold neutrons. Since the basics of our traveling-wave concept of spatial spin resonance have already been published 39-42 , in what follows we will focus on the description of the essential constructional features of this resonator prototype and on the results of the first experiments. Details of the dedicated electronics which we have developed to run MONOPOL will be described in a forthcoming paper.

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“…[101,102] are included in the average), leading to a relative precision of 4 × 10 −4 . There are several ongoing and planned developments that promise to extend the sensitivity towards or even beyond the level of 10 −4 [103][104][105][106][107]. To establish the V ud determination from neutron decay at a level competitive with superallowed β decays commensurate improvements in the lifetime are necessary.…”

Section: Observablementioning

confidence: 99%

β Decays as Sensitive Probes of Lepton Flavor Universality

2020

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Nuclear β decays as well as the decay of the neutron are well-established low-energy probes of physics beyond the standard model (SM). In particular, with the axial-vector coupling of the nucleon g A determined from lattice QCD, the comparison between experiment and SM prediction is commonly used to derive constraints on right-handed currents. Further, in addition to the CKM element V us from kaon decays, V ud from β decays is a critical input for the test of CKM unitarity. Here, we point out that the available information on β decays can be reinterpreted as a stringent test of lepton flavor universality (LFU). In fact, we find that the ratio of V us from kaon decays over V us from β decays (assuming CKM unitarity) is extremely sensitive to LFU violation (LFUV) in W-μ-ν couplings thanks to a CKM enhancement by ðV ud =V us Þ 2 ∼ 20. From this perspective, recent hints for the violation of CKM unitarity can be viewed as further evidence for LFUV, fitting into the existing picture exhibited by semileptonic B decays and the anomalous magnetic moments of muon and electron. Finally, we comment on the future sensitivity that can be reached with this LFU violating observable and discuss complementary probes of LFU that may reach a similar level of precision, such as Γðπ → μνÞ=Γðπ → eνÞ at the PEN and PiENu experiments or even direct measurements of W → μν at an FCC-ee.

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Design of the magnet system of the neutron decay facility PERC

Cited by 21 publications

References 42 publications

Dispersion relation analysis of the radiative corrections to gA in the neutron β-decay

Dispersion relation analysis of the radiative corrections to gA in the neutron β-decay

MONOPOL - A traveling-wave magnetic neutron spin resonator for tailoring polarized neutron beams

β Decays as Sensitive Probes of Lepton Flavor Universality

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