We will bring together experts in both theory and experiment to evaluate the prospects for measuring the absolute neutrino mass with new (post-KATRIN) technologies, and for eventually detecting cosmological neutrino relics with radioactive isotopes. These technologies include radioactive ion storage rings, crystallized beams, beta beams, atomic spectroscopy, low-Q isotopes, laser atomic trapping, laser detection, and evaporative cooling.
The goal of this workshop will be to identify promising directions for detector and beams technology development, stimulate theoretical work useful towards these measurements, identify the technologies which can reach the next orders of magnitude over KATRIN sensitivity and possibly discover neutrino relics, and to sketch a design for a next-generation neutrino mass instrument or research that could lead in this direction.
We discuss the phenomenology of the Mössbauer neutrino experiment
proposed recently by Raghavan. In particular, we will show that Mössbauer neutrinos do oscillate, in
spite of their extremely small energy uncertainty. Using a quantum field theoretical approach, we
will compute the combined rate of Mössbauer neutrino production, oscillation and detection, and
discuss the arising coherence and localization conditions.
(Max Planck Institute for Nuclear Physics)
One-dimensional ordering in high-energy ion beams
A sudden reduction of momentum spread, and under certain conditions also of
Schottky-noise power, has been observed with electron-cooled beams at a few
ion storage rings. This has been interpreted as an effect of one-dimensional
ordering of the beams, such that the ions line up after one another in the
ring. A brief overview of subject of beam crystallization or beam ordering
is given, and results from observations and measurements of beam ordering at
CRYRING in Stockholm are given together with a model of the ordered beam.
Contribution of Penning trap mass spectrometry to neutrino physics
Penning traps provide nowadays highest sensitivity, precision and
accuracy for atomic mass spectrometry . In the combined strong
magnetic field and weak electric field of a Penning trap a charged
particle can be stored and observed for long time thus frequency
comparisons well below ppb can be performed. Different techniques
such as non-destructive detection with single ion sensitivity or
destructive time-of-flight resonance techniques are available to
measure with high resolution the motional frequencies in the trap,
yielding the free space cyclotron frequency which is inversely
proportional to the charged particles mass.
1. K. Blaum, Phys. Rep. 425, 1-78 (2006)
2. Sz. Nagy et al., Europhys. Lett. 74, 404?410 (2006)
3 G. Douysset et al., Phys. Rev. Lett. 86, 4259 - 4262 (2001)
4. M. Suhonen et al., JINST 2, P06003 (2007)
5. M. Redshaw et al., Phys. Rev. Lett. 98, 053003 (2007)
A number of important mass measurements with remarkable precision
have been performed for applications in neutrino physics experiments
studying beta-decay or searching for neutrinoless double-beta-decay
(0nBB) or radiative neutrinoless double electron capture (0n2EC)
processes, where the atomic mass of the initial and final state
nuclei or the mass difference are a much needed input.
The mass measurement principle will be introduced and the different
detection techniques will be compared. The latest advances shall be
summarized, new ideas and upcoming experiments will be presented.
The talk will cover some of the recent highlights such as the
measurement of the 3H-3He mass difference giving the endpoint of the
tritium beta-decay with 1.2 eV precision , the 76Ge-76Se Q-value
of 2039.006(50) keV [3,4] and the 136Xe-136Ba Q-value 2457.83(37)
Bounds on sterile neutrinos using full kinematic reconstruction of radioactive decays
Current bounds on mixing angles for light (several keV range)
sterile neutrinos are rather weak, though theoretically it is a very
interesting region. An interesting experimental technique for
analysing such neutrinos is full kinematic reconstruction of the
nuclear beta decay. This method, in principle, allows an event by
event measurement of the neutrino mass, compared to large
statistical noise of the kink search in the usual electron spectrum.
I'll discuss advantages and problems of this approach.
(MPI fur Kernphysik)
The MARE project: the calorimetric approach potential
The international project "Microcalorimeter Arrays for a Rhenium
Experiment" (MARE) aims at a direct and calorimetric measurement of
the electron antineutrino mass with sub-electronvolt sensitivity.
The experimental strategy consists in analysing the beta spectrum of
187Re near the end-point looking for the spectral distortion
expected for a finite antineutrino mass. In these experiments the
detectors are thermal calorimeters with absorbers made of rhenium or
of one of its compounds. Therefore the beta decay source is
internal to the sensitive detector removing the most severe
systematic uncertainties which have plagued the traditional and, so
far, more sensitive spectrometers. In the final experimental phase,
large arrays with as many as 10000 detectors each will be realized.
At least five arrays will be then deployed to collect the statistics
required to probe the antineutrino mass with a sensitivity of at
least 0.2 eV, comparable to the one expected for the Katrin
In this talk I would like to give an update on the status of the
MARE experimental activity and their prospects. I will then discuss
the results of a detailed study of the sensitivity achievable with
the calorimetric approach.
(INFN Milano-Bicocca / Dip. di Fisica U. di Milano-Bicocca)
Orbital electron capture decay of hydrogen-like ions (GSI)
At GSI Darmstadt, we have studied the decay of highly-charged heavy
ions, stored and cooled in the experimental storage ring, ESR, by
means of time-resolved Schottky-noise mass spectroscopy. The Fast
Fourier Transform, FFT, of the Schottky noise is a non-destructive,
non-instantaneous detection method, sensitive to a single heavy ion
circulating in the ring. We have focused our interest on the
two-body orbital electron capture decay of hydrogen-like ions, and
have developed a method that allows us to identify unambiguously the
decay channel and the decay time by observing both the parent and
the daughter ions. We have investigated the decay of small numbers
of particles stored and cooled in the ring, and we have observed
deviations from the expected exponential decay of 140 Pr and 142 Pm
ions . In this contribution, I will concentrate on the
motivation, on the method, and on the experimental findings of these
The Karlsruhe Tritium Neutrino Experiment KATRIN
The KArlsruher TRItium Neutrino experiment KATRIN is going to search
for the neutrino mass from the endpoint region of the tritium beta
decay spectrum with one order of magnitude higher sensitivity of 0.2
eV/c2 compared to previous direct neutrino mass experiments. This
sensitvity will allow to distinguish between hierarchical and
quasi-degenerate neutrino mass scenarios as well as to investigate
the whole cosmological relevant neutrino mass range.
The KATRIN experiment is currently being set up at Forschungszentrum
Karlsruhe/Germany by an international collaboration. The key
elements of KATRIN are a windowless gaseous molecular tritium source
with an ultra-high luminosity and which minimizes systematic
uncertainties, a very effective tritium retention and electron
guiding system, the 23m long and 10m diameter main spectrometer of
MAC-E-Filter type, and an electron detector. This setup allows to
measure the tritium beta spectrum with unprecedented signal rate and
energy resolution of 0.93eV. The scientific context, the present
status of KATRIN, its technical challenges and a discussion on
KATRIN`s systematics and sensitivity will be presented.
(University of Münster, Germany)
Theory and Cosmology
The electron endpoint from accelerated ions - a new route to the neutrino mass scale?
We introduce the possibility of determining the neutrino mass scale from monitoring the decays of a crystalised beam. Through the careful control of the beam momentum, one can perform a 'cut' on the electron spectrum with only electrons near the endpoint traveling backwards in the laboratory frame. The idea is introduced with the results from preliminary simulations presented.
Measuring the neutrino mass from large scale structure
Future large scale structure surveys provide one of the most
promising techniques for probing the neutrino mass. I will present
results from detailed N-body simulations of structure formation in
models with neutrino mass. Such simulations are necessary for the
next generation of surveys such as the LSST
(University of Aarhus)
The GSI anomaly and neutrino mixing
It will be shown why the GSI anomaly can in principle not be due to
Coherent target effects for atomic neutrino mass spectroscopy and detection of relic neutrino
New experimental method using isolated atoms and molecules
implanted in sold matrix is explained, whose goal is to measure all 3 neutrino masses and the
unknown mixing angle along with determination of Majorana or Dirac particle. If the method works, it
is expected to detect the cosmic relic neutrino, too.
Emergent Electroweak Gravity
We show that the cosmic neutrino background is a superfluid today, and the quantum numbers of the order parameter give a goldstone graviton, with a coupling numerically similar to the actual Newton's constant.
Relic neutrino detection using beta decaying nuclei
We present a study on the interaction of low energy electron
neutrinos on nuclei that undergo both beta decay and electron
capture. We show that, due to the absence of an energy threshold and
to the relatively high value of the cross section, these processes
are the only ones to date having a realistic chance to unambiguously
detect the yet undiscovered cosmological relic neutrino background.
DrAlfredo Giuseppe Cocco
(Istituto Nazionale di Fisica Nucleare)
Experimental challenges towards the detection of relic neutrinos with unstable nuclei
In this talk I will review the experimental challenges towards the
detection of relic neutrinos. The talk is based on a paper where the
idea of detecting relic neutrinos with instable nucli is renewed.
Different target nucli and experimental approaches are considered
and, the advantage and the difficulties of different experimental
techniques are discussed.