«Table of Contents Invited Talks The present status of particle physics with slow neutrons Dirk Dubbers Fundamental Neutron Properties William J. ...»
Table of Contents
The present status of particle physics with slow neutrons
Fundamental Neutron Properties
William J. Marciano
Low energy precision physics and the high energy frontier
Fundamental Neutron Physics with Long-Pulsed Spallation Sources
W. M. Snow
Intense sources of ultra-cold neutrons at long pulse spallation sources
J. Michael Pendlebury (1) and Geoffrey L Greene (2)
Stefan Baeßler ESS
Status of the European Spallation Source and the Instrument Selection Process
Richard Hall-Wilton The ESS Target Station
Ferenc Mezei UCN Production
Ultracold neutron production at the second spallation target of the Paul Scherrer Institute.......6 Bernhard Lauss on behalf of the PSI UCN Project Team The spallation-driven ultra-cold neutron source at Los Alamos National Lab
A. Saunders, Mark Makela, and Christopher Morris Spallation UCN production in He-II for nEDM measurement
Yasuhiro Masuda (1), Kichiji Hatanaka (2), Sun-Chan Jeong (1), Shinsuke Kawasaki (1), Ryohei Matsumiya (2), Kensaku Matsuta (3), Mototsugu Mihara (3) and Yutaka Watanabe (1) Superfluid-helium ultracold neutron sources – concepts for the ESS?
Oliver Zimmer Spallation-Driven Ultracold Neutron Sources: Concepts for a Next Generation Source............7 A. R. Young, M. Makela, C. Morris, G. Muhrer and A. Saunders Infrastructure for next generation experiments with ultra-cold neutrons
Peter Fierlinger Neutron Oscillations and Baryon Number Violation
Search for Neutron-Antineutron Transformation at Fermilab Project X
Y. Kamyshkov on behalf of NNbarX Collaboration  Neutron oscillations and its implications in physics and astrophysics
Zurab Berezhiani Testing baryon number conservation in braneworld models at ESS
Michaël Sarrazin Gravity and short-range forces
Neutron gravity experiments and tests of the Weak Equivalence Principle
A.I. Frank (1), P. Geltenbort (2), S.V. Goryunov (1), M. Jentschel (2), D.V. Kustov (1,3), G.V. Kulin (1), A.N. Strepetov(4) Band Gap for Neutron due to non-Newtonian gravity-like force
K. Taketani Probing Modified Gravity with Ultra Cold Neutrons
Philippe Brax Gravity Resonance Spectroscopy within the qBounce experiment
T. Jenke (1), G. Cronenberg (1), H. Filter (1), P. Geltenbort (2) and H. Abele (1) Neutron Decay and Beam Experiments
Bound Beta-Decay: BoB
J. McAndrew (1), S. Paul (1), R. Engels (2), P. Fierlinger (3), E. Gutsmiedl (1), W. Schott (1) and R. Stoepler (1) Neutron-decay correlation measurements with polarized and pulse beams
Tim Chupp Precision Measurements of Correlation Coefficients in Pulsed Neutron Beams
Bastian Märkisch Neutron Beta Decay at the ESS – Beamline parameters and performance for a PERC-like instrument
C. Klauser A Path to a 0.1s Neutron Lifetime Measurement Using the Beam Method
F. E. Wietfeldt First results from the NPDGamma experiment at the Spallation Neutron Source
W. S. Wilburn for the NPDGamma Collaboration.
Ramsey Experiments using Neutron Beams
Florian M. Piegsa Invited Talks The present status of particle physics with slow neutrons Dirk Dubbers Physikalisches Institut, Heidelberg University, D-69120 Heidelberg, Im Neuenheimer Feld 226 Slow neutrons are a dominant tool to explore the low-energy high-precision frontier of particle physics. I shall give an overview of the physics aims and of the present status of experiments in this field, which may serve as a basis for the discussion of the potential and future development of neutron-particle physics.
Fundamental Neutron Properties William J. Marciano Brookhaven National Laboratory, Upton, New York 11973 Fundamental properties of neutrons are discussed. Emphasis is on the relationship between the neutron lifetime and axial charged current coupling, including electroweak radiative corrections.
Implications of recent muon capture on Hydrogen results for the induced pseudoscalar coupling are also described. The relationship between neutron magnetic and electric dipole moments is discussed. The possibility that neutrons may be Majorana states is raised and used as an analogy for possible dark matter particle properties.
Low energy precision physics and the high energy frontier A. Signer Paul Scherrer Institut, Villigen, and Institute for Theoretical Physics, University of Zurich In this talk I give an overview over indirect tests of the Standard Model, with emphasis on the link between low energy measurements and activities at the high energy frontier. Even at the LHC, the search for physics beyond the Standard Model is not exclusively driven by an attempt to produce new particles. There is also an extensive programme of precision tests whereby properties of Standard Model particles are scrutinized in the hope of finding deviations that point towards new physics. A common framework for such tests is an effective theory approach. Physics at a high scale is integrated out and this results in higher-dimensional operators that affect low energy observables. This framework allows to take a global view on precision experiments at very different energy scales.
Fundamental Neutron Physics with Long-Pulsed Spallation Sources W. M. Snow Indiana University/CEEM In this talk I will attempt to summarize those features of a long-pulse spallation neutron source which are most relevant to the types of measurements typically conducted in nuclear/particle/astrophysics experiments with slow neutrons. I will also present a few specific examples of experiments which would benefit from the unique combination of pulse structure and neutron brightness to be expected from the ESS.
Intense sources of ultra-cold neutrons at long pulse spallation sources J. Michael Pendlebury (1) and Geoffrey L Greene (2) (1) University of Sussex, (2) University of Tennessee / Oak Ridge National Lab While intense reactor based sources of ultra cold neutrons have been in operation for approximately 3 decades, it is only in the last few years that practical sources of UCN have been realized at spallation sources. Existing and proposed spallation based UCN sources employ two distinct strategies. In the first, the UCN convertor (superfluid He or Solid D2 ) is placed in the immediate vicinity of a spallation target. In the second, a convertor (typically superfluid He) is placed at the end of a cold neutron guide. The relative merits of these two approaches will be reviewed and their application to long pulse spallation sources will be discussed. Particular attention will be given to the opportunities, and constraints, presented by the baseline design of the European Spallation Source.
The ESS Target Station Ferenc Mezei ESS AB The design of the ESS follows the double priority of high environmental safety and best neutronic performance for cold and thermal neutron production including the availability of intense combination of both thermal and cold neutrons at all beam lines using bi-spectral beam extraction. Meeting the safety requirements with a comfortable margin at the 5 MW beam power level of ESS calls for novel basic technical choices for a spallation source. The optimization of neutronic performance is an ongoing process, which needs to be aimed at an optimal compromise between contradictory requirements by the various possible research goals, including moderator brightness, beam extraction openings in the reflector, special beam lines, number of moderators, number of possible beam lines, etc. The presentation will focus on the basic lay-out and optimization opportunities under discussion or to be discussed.
UCN Production Ultracold neutron production at the second spallation target of the Paul Scherrer Institute Bernhard Lauss on behalf of the PSI UCN Project Team Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland The ultracold neutron (UCN) source at the Paul Scherrer Institute (PSI) is in operation since August 2011. Neutron production is based on spallation using a 590 MeV beam of protons with up to 2.4 mA on a lead 'Cannelloni' target in macro pulses of a few seconds duration. Neutrons are moderated in heavy water, cooled and downscattered to be ultracold using up to 30 liter of solid deuterium. We will report on our experience from the first operation phase and detail some specific measurements and results.
The spallation-driven ultra-cold neutron source at Los Alamos National Lab A. Saunders, Mark Makela, and Christopher Morris Los Alamos National Lab, Los Alamos, NM, USA 87545.
In this talk, we describe the performance of the Los Alamos spallation-driven solid-deuterium ultracold neutron (UCN) source. Measurements of the cold neutron flux, the very low energy neutron production rate, and the UCN rates and density at the exit from the biological shield are presented and compared to Monte Carlo predictions. The cold neutron rates compare well with predictions from the Monte Carlo code MCNPX and the UCN rates agree with our custom UCN Monte Carlo code. The source is shown to perform as modeled. The maximum delivered UCN density at the exit from the biological shield is 52(9) UCN/cc with a solid deuterium volume of 1500 cm3.  A. Saunders et al., Rev. Sci. Inst. 84 (2013) 013304 (2013).
Spallation UCN production in He-II for nEDM measurement Yasuhiro Masuda (1), Kichiji Hatanaka (2), Sun-Chan Jeong (1), Shinsuke Kawasaki (1), Ryohei Matsumiya (2), Kensaku Matsuta (3), Mototsugu Mihara (3) and Yutaka Watanabe (1) (1) KEK, 1-1 Oho, Tsukuba, Ibaraki, Japan (2) Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka, Japan (3) Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan The neutron electric dipole moment (nEDM) is a clue to understand baryogenesis in the universe.
The standard model of particle physics predicts far smaller baryon asymmetries than observed, although it predicts an extremely small neutron EDM. New physics such as SUSY, which can explain the baryon asymmetry, predicts a neutron EDM of 10 -26 to 10-27 e cm. We discuss, here, a new UCN source for a nEDM measurement of 10 -27 e cm. For this measurement, we have increased ultracold neutron (UCN) density by means of a superthermal method . The UCN density is obtained from the product of UCN production rate and lifetime. We have placed a He-II bottle in a spallation neutron source, where the UCN production rate is optimized. The temperature of the He-II is lowered below 1 K so that the UCN lifetime becomes long. We also discuss a new magnetometer, which reduces the geometric phase effect (GPE) . The GPE arises from particle motion in a magnetic field gradient. The motion of the 129Xe atom is largely suppressed because of a short mean free path for 129Xe interatomic collisions.
 Y. Masuda et al., Phys. Rev. Lett. 108 (2012) 134801.
 Y. Masuda et al., Phys. Lett. A 376 (2012) 1347.
Superfluid-helium ultracold neutron sources – concepts for the ESS?
Oliver Zimmer Institut Laue Langevin, 38042 Grenoble, France Conversion of cold to ultracold neutrons in superfluid helium provides a viable mechanism to achieve high densities. Various projects based on different technical concepts were begun around the world, comprised of converter locations either “in-pile” close to the core of a nuclear reactor or at the end of a neutron guide, or coupled to a neutron spallation source. This talk intends to trigger a discussion about source concepts which might be envisaged for implementation into the ESS design study.
Spallation-Driven Ultracold Neutron Sources: Concepts for a Next Generation Source A. R. Young, M. Makela, C. Morris, G. Muhrer and A. Saunders North Carolina State University Ultracold neutrons (UCN) provide a valuable tool for fundamental physics studies with neutrons, with current experiments planned or in operation to probe the neutron static electric dipole moment, the neutron beta-decay lifetime and angular correlations, gravitational bound states and new short-range interactions, the electric charge of the neutron, and more. In order to address these problems, intense sources of ultracold neutrons are required. We present some background concerning our operating solid deuterium ultracold neutron source at Los Alamos , and then outline strategies for achieving higher densities and total UCN production rates in a nextgeneration source. In particular, we present neutronics calculations for a conceptual design based on a moderator and superfluid liquid He converter surrounded by a spallation target. Such a source might be appropriate for a competitive neutron-antineutron oscillations experiment as well as more conventional UCN experiments.
 A. Saunders et al., Reviews of Scientific Instruments 84, (2013) 013304.
Infrastructure for next generation experiments with ultra-cold neutrons Peter Fierlinger TU München and Excellence-Cluster “Universe” Next generation measurements of fundamental quantities using ultra-cold neutrons impose stringent requirements on the infrastructure of a facility. First experiences gained during the realization of a next-generation facilities at the FRM-II reactor in Garching will be discussed to serve as an input for a respective beam position at the ESS.
Neutron Oscillations and Baryon Number Violation Search for Neutron-Antineutron Transformation at Fermilab Project X Y. Kamyshkov on behalf of NNbarX Collaboration  University of Tennessee, Knoxville, TN 37996-1200 USA The observation of neutron to antineutron oscillation would be a major breakthrough in particle physics, providing evidence for baryon number violation, which is needed to explain the observed baryon asymmetry of the universe. The Standard Model can accommodate baryon number violation via non-perturbative mechanisms, which break both baryon (B) and lepton number (L) but preserve B–L. The study of n-nbar oscillation (a ΔB = 2 process) is complementary to that of proton decay, which would be a ΔB = 1 process. Such oscillation might therefore be related to the lepton sector, as the annihilation of Majorana neutrinos is a ΔL = 2 process: if L is broken by two units then it is natural for B to be broken by two units, too. Thus, unified theories with Majorana neutrinos also predict n-nbar oscillation. However, there is no clear prediction for the scale of such oscillations, so the scientific case would be exciting, provided a large step in sensitivity could be obtained by new experiment.