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Summary – Session Summary – Session

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Summary – Session - PPT Presentation

Nu3 Absolute neutrino mass Snowmass 2013 Minneapolis Aug 2 2013 Hamish Robertson University of Washington Convenors Ben Monreal Hamish Robertson Particle Physics Cosmology ID: 376008

neutrino mass ptolemy project mass neutrino project ptolemy tritium beta capture decay planck 2013 proof relic summary echo phase

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Slide1

Summary – Session Nu-3Absolute neutrino mass

Snowmass 2013,Minneapolis Aug 2, 2013

Hamish Robertson, University of Washington

Convenors

: Ben

Monreal

, Hamish RobertsonSlide2

Particle Physics Cosmology

What

is the

neutrino mass

scale?Slide3

InputsPresent laboratory limit 1.8

eV (90% CL) from Mainz and Troitsk experiments on tritium

KATRIN experiment under construction. Project 8 in proof-of-concept phase.

MARE

Re-187 not being pursued at present.ECHo Ho-163 in proof-of-concept phase.PTOLEMY in proof-of-concept phase.Cosmological inputs driven by Planck, SPT, ACT, …3Slide4

White PapersPTOLEMY: Development of a relic neutrino detection experiment… 1307.4738

KATRIN: Neutrino mass from the beta decay of tritium. 1307.5486PROJECT 8:

coming soon…4Slide5

5

K. Abazajian, CF5 SummarySlide6

Planck XVI

WP = WMAP Polarization data

A

L

= weak lensing parameterτ = optical depth at recombination“…Planck lensing likelihood favours

larger

Σm than the temperature power spectrum.”

First Planck analysis (March 2013)Slide7

Neutrinoless Double Beta Decay

1

sigma

W.

Rodejohann, 1206.2560Depends on mv but not a `direct’ measurementSlide8

Neutrino

mass from Beta Spectra

neutrino masses

mixing

With flavor mixing

:

from oscillations

mass scale

8Slide9

Current status of direct mass measurement

Mainz

: solid T

2

, MAC-E filter

C. Kraus et al., Eur. Phys. J. C40, 447 (2005)

Troitsk

: gaseousT

2

, MAC-E filter

V. Aseev et al., PRD in press (2011)

Together:…

m

v

<

1.8

eV

(95% CL)

9Slide10

TLK

KATRIN

At

Karlsruhe Institute

of

Technology

unique

facility

for

closed

T

2

cycle

:

Tritium Laboratory Karlsruhe

10

A

direct, model-independent

, kinematic method, based on

β

decay of tritium.

~ 75 m

long

with

40

s.c

.

solenoidsSlide11

11

~0.4

eV

First measurement, U

IE

= 700V, electron gun source.

July 12, 2013.Slide12

KATRIN’

s uncertainty budget

Statistical

Final-state spectrum

T

-

ions in T

2 gasUnfolding energy lossColumn densityBackground slope

HV variationPotential variation in sourceB-field variation in sourceElastic scattering in T2 gas

σ

(m

v

2

)

0

0.01 eV

2

σ

(m

v

2

)

total

= 0.025 eV

2

12

m

v

<

0.2

eV

(90 % CL)Slide13

Electron Capture Holmium Expt

(ECHO)13

187

J.F. WilkersonSlide14

14

J.F. Wilkerson

187

Electron Capture Holmium Expt (ECHO)Slide15

(B.

Monreal and J. Formaggio, PRD 80:051301, 2009)

Cyclotron radiation from tritium beta decay

25.5-GHz waveguide cellSlide16

Project 8 sensitivity

16Slide17

Project 8: a phased approachSlide18

Neutrino Mass Limits from Beta decaySlide19

2012

2013

2014

2015

2016

2017

2018

Analysis 1

Analysis 2

Planck:

Construction

Running

KATRIN:

Phase I

Proof concept

Prototype

Project 8:

Neutrino mass: some milestones

19Slide20

Capture of relic Neutrinos

PTOLEMY project

20Slide21

Capture of relic Neutrinos

PTOLEMY project

21Slide22

PTOLEMY Experimental Layout

22

Tritium Source Disk

(Surface Deposition)

High Field Solenoid

Long High Uniformity

Solenoid (~2T)

Accelerating

Potential

MAC-E filter

(De-accelerating

Potential)

Accelerating

Potential

RF Tracking

(38-46 GHz)

Time-of-Flight

(De-accelerating

Potential)

Cryogenic

Calorimeter

(~0.1eV)

Low Field

Region

e

-

E

0

-18.4keV

0-1keV

(~150eV)

E

0

E

0

+30kV

~50-150eV

below

EndpointSlide23

PTOlemy summary

100 g of tritium (1 MCi) on 12-m diameter disk.Relic capture rate ~ 10/year without local clustering.Also presumably able to measure mass, active and sterile.Transition-edge sensor array to provide basic 0.1-eV resolution.

Tagging with RF cyclotron radiation a la Project 8.Necessary to understand quantum effects of binding of T2 on surface.

23Slide24

Neutrino mass Physics Impact

24Slide25

summaryDirect mass measurements are largely model independent:

Majorana or DiracNo nuclear matrix elementsNo complex phasesNo cosmological degrees of freedomOne experiment in construction (KATRIN); 2015 start.Three experiments in R&D (Project 8,

ECHo, PTOLEMY)

25Slide26

26