T. Söldner
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Development of electron detectors for the BRAND experiment Open
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View article: Search for beyond standard model physics in free neutron decay
Search for beyond standard model physics in free neutron decay Open
Applying a Mott polarimetry for measurement of the transverse polarization components of electrons from free neutron decay as well as proton momentum reconstruction using the combination of the time of flight method and the kinematical con…
View article: Realization of an advanced super-mirror solid-state neutron polarizer for the instrument PF1B at the Institut Laue–Langevin
Realization of an advanced super-mirror solid-state neutron polarizer for the instrument PF1B at the Institut Laue–Langevin Open
In this last of a series of three papers on the development of an advanced solid-state neutron polarizer, we present the final construction of the polarizer and the results of its commissioning. The polarizer uses spin-selective reflection…
New Limit on Axionlike Dark Matter Using Cold Neutrons Open
We report on a search for dark matter axionlike particles (ALPs) using a Ramsey-type apparatus for cold neutrons. A hypothetical ALP-gluon coupling would manifest in a neutron electric dipole moment signal oscillating in time. Twenty-four …
View article: Data from: Improved FIFRELIN de-excitation model for neutrino applications
Data from: Improved FIFRELIN de-excitation model for neutrino applications Open
New FIFRELIN cascades for the isotopes 156,158Gd are distributed to the community, to be used for various applications. The new cascades feature an improved modeling of de-excitation. The main improvements are: 1) Inclusion of primary tran…
View article: Data from: Improved FIFRELIN de-excitation model for neutrino applications
Data from: Improved FIFRELIN de-excitation model for neutrino applications Open
New FIFRELIN cascades for the isotopes 156,158Gd are distributed to the community, to be used for various applications. The new cascades feature an improved modeling of de-excitation. The main improvements are: 1) Inclusion of primary tran…
New Limit on Axion-Like Dark Matter using Cold Neutrons Open
We report on a search for dark matter axion-like particles (ALPs) using a\nRamsey-type apparatus for cold neutrons. A hypothetical ALP-gluon-coupling\nwould manifest in a neutron electric dipole moment signal oscillating in time.\nTwenty-f…
New Limit on Axion-Like Dark Matter using Cold Neutrons Open
We report on a search for dark matter axion-like particles (ALPs) using a Ramsey-type apparatus for cold neutrons. A hypothetical ALP-gluon-coupling would manifest in a neutron electric dipole moment signal oscillating in time. Twenty-four…
View article: Mott polarimeter for electrons from neutron decay in BRAND experiment
Mott polarimeter for electrons from neutron decay in BRAND experiment Open
The BRAND experiment aims at the search of Beyond Standard Model (BSM) physics via\nmeasurement of exotic components of week interaction. For this purpose the eleven correlation\ncoefficients of the neutron β decay will be measured simulta…
View article: Search for BSM physics with neutron beta decay in the BRAND project
Search for BSM physics with neutron beta decay in the BRAND project Open
Neutron and nuclear beta decay correlation coefficients are sensitive to the exotic scalar and tensor interactions hypotheses that are beyond the Standard Model (BSM). The BRAND project aims at a test of the Lorentz structure of weak inter…
View article: Searching for Hidden Neutrons with a Reactor Neutrino Experiment: Constraints from the STEREO Experiment
Searching for Hidden Neutrons with a Reactor Neutrino Experiment: Constraints from the STEREO Experiment Open
Different extensions of the standard model of particle physics, such as braneworld or mirror matter models, predict the existence of a neutron sterile state, possibly as a dark matter candidate. This Letter reports a new experimental const…
View article: BRAND – exploring transverse polarization of electrons emitted in neutron decay
BRAND – exploring transverse polarization of electrons emitted in neutron decay Open
Neutron and nuclear beta decay correlation coefficients are sensitive to the exotic scalar and tensor interactions that are not included in the Standard Model (SM). The proposed experiment BRAND will measure simultaneously seven neutron co…
View article: Joint Measurement of the $^{235}$U Antineutrino Spectrum by Prospect and Stereo
Joint Measurement of the $^{235}$U Antineutrino Spectrum by Prospect and Stereo Open
The PROSPECT and STEREO collaborations present a combined measurement of the pure $^{235}$U antineutrino spectrum, without site specific corrections or detector-dependent effects. The spectral measurements of the two highest precision expe…
First antineutrino energy spectrum from <sup>235</sup> U fissions with the S <span>TEREO</span> detector at ILL <sup>*</sup> Open
This article reports the measurement of the 235 U-induced antineutrino spectrum shape by the Stereo experiment. 43 000 antineutrinos have been detected at about 10 m from the highly enriched core of the ILL reactor during 118 full days equ…
Measuring the delayed neutrons multiplicity and kinetic parameters for the thermal induced fission of <sup>235</sup>U, <sup>239</sup>Pu and <sup>233</sup>U Open
In the normal operation of nuclear reactors, the kinetic behavior of the neutron population in the core is driven by the so-called delayed neutrons (DN). The DN yield per fission, their average lifetime and their groups’ abundances are the…
Recent design studies for the novel momentum spectrometer NoMoS Open
NoMoS is a novel momentum spectrometer with which we aim to measure the spectra of the charged neutron beta decay products with high precision. The shape of the proton and electron spectra can inter alia be used for the determination of th…
Limit on the Fierz Interference Term from a Measurement of the Beta Asymmetry in Neutron Decay Open
In the standard model of particle physics, the weak interaction is described by vector and axial-vector couplings only. Nonzero scalar or tensor interactions would imply an additional contribution to the differential decay rate of the neut…
View article: Improved sterile neutrino constraints from the STEREO experiment with 179 days of reactor-on data
Improved sterile neutrino constraints from the STEREO experiment with 179 days of reactor-on data Open
The STEREO experiment is a very short baseline reactor antineutrino experiment. It is designed to test the hypothesis of light sterile neutrinos being the cause of a deficit of the observed antineutrino interaction rate at short baselines …
View article: Note on arXiv:2005.05301, 'Preparation of the Neutrino-4 experiment on search for sterile neutrino and the obtained results of measurements'
Note on arXiv:2005.05301, 'Preparation of the Neutrino-4 experiment on search for sterile neutrino and the obtained results of measurements' Open
We comment on the claimed observation [arXiv:arXiv:2005.05301] of sterile neutrino oscillations by the Neutrino-4 collaboration. Such a claim, which requires the existence of a new fundamental particle, demands a level of rigor commensurat…
View article: Note on arXiv:2005.05301, 'Preparation of the Neutrino-4 experiment on\n search for sterile neutrino and the obtained results of measurements'
Note on arXiv:2005.05301, 'Preparation of the Neutrino-4 experiment on\n search for sterile neutrino and the obtained results of measurements' Open
We comment on the claimed observation [arXiv:arXiv:2005.05301] of sterile\nneutrino oscillations by the Neutrino-4 collaboration. Such a claim, which\nrequires the existence of a new fundamental particle, demands a level of rigor\ncommensu…
Measurement of the delayed-neutron multiplicity and time constants in the thermal neutron induced fission of <sup>235</sup>U at ILL Open
Delayed-neutron (DN) data is essential in inherent reactor safety and reactor control since it is needed for the estimation of the reactivity. Nowadays, discrepancies among the data in various international databases (JEFF, ENDF, JENDL) ar…
ANNI – A pulsed cold neutron beam facility for particle physics at the ESS Open
\nPulsed beams have tremendous advantages for precision experiments with cold neutrons. In order to minimise and measure systematic effects, they are used at continuous sources in spite of the related substantial decrease in intensity. At …