In this paper, we investigate whether it is possible to determine the neutrino mass hierarchy via a high-statistics and real-time observation of supernova neutrinos with short-time characteristics. The essential idea is to utilize distinct times-of-flight for different neutrino mass eigenstates from a core-collapse supernova to the Earth, which may significantly change the time distribution of neutrino events in the future huge water-Cherenkov and liquid-scintillator detectors. For illustration, we consider two different scenarios. The first case is the neutronization burst of 
					 emitted in the first tens of milliseconds of a core-collapse supernova, while the second case is the black hole formation during the accretion phase for which neutrino signals are expected to be abruptly terminated. In the latter scenario, it turns out only when the supernova is at a distance of a few Mpc and the fiducial mass of the detector is at the level of gigaton, might we be able to discriminate between normal and inverted neutrino mass hierarchies. In the former scenario, the probability for such a discrimination is even less due to a poor statistics.
				

China

Junji Jia

Yaoguang Wang

Shun Zhou

On the possibility to determine neutrino mass hierarchy via supernova neutrinos with short-time characteristics Supported in part by the National Natural Science Foundation of China (11504276, 11547310) (J.J. and Y.W.), by the National Recruitment Program for Young Professionals and the CAS Center for Excellence in Particle Physics (S.Z.)

NEXT is an experiment dedicated to neutrinoless double beta decay searches in xenon. The detector is a TPC, holding 100 kg of high-pressure xenon enriched in the 136Xe isotope. It is under construction in the Laboratorio Subterráneo de Canfranc in Spain, and it will begin operations in 2015. The NEXT detector concept provides an energy resolutionbetter than 1% FWHM and a topological signal that can be used to reduce the background. Furthermore, the NEXT technology can be extrapolated to a 1 ton-scale experiment.

Spain

P. Ferrario

J.J. Gómez Cadenas

V. Álvarez

Portugal

F.I.G. Borges

S. Cárcel

J. Castel

S. Cebrián

A. Cervera

C.A.N. Conde

T. Dafni

T.H.V.T. Dias

J. Díaz

United States

M. Egorov

R. Esteve

JINR

P. Evtoukhovitch

L.M.P. Fernandes

A.L. Ferreira

E.D.C. Freitas

V.M. Gehman

A. Gil

A. Goldschmidt

H. Gómez

D. González-Díaz

Colombia

R.M. Gutiérrez

J. Hauptman

J.A. Hernando Morata

D.C. Herrera

F.J. Iguaz

I.G. Irastorza

M.A. Jinete

L. Labarga

A. Laing

I. Liubarsky

J.A.M. Lopes

D. Lorca

M. Losada

G. Luzón

A. Marí

J. Martín-Albo

A. Martínez

T. Miller

A. Moiseenko

F. Monrabal

M. Monserrate

C.M.B. Monteiro

F.J. Mora

L.M. Moutinho

J. Muñoz Vidal

H. Natal da Luz

G. Navarro

M. Nebot-Guinot

D. Nygren

C.A.B. Oliveira

R. Palma

Javier Pérez

J.L. Pérez-Aparicio

J. Renner

L. Ripoll

A. Rodríguez

J. Rodríguez

F.P. Santos

J.M.F. dos Santos

L. Seguí

L. Serra

D. Shuman

A. Simón

C. Sofka

M. Sorel

J.F. Toledo

A. Tomás

J. Torrent

Z. Tsamalaidze

J.F.C.A. Veloso

J.A. Villar

R. Webb

J. White

N. Yahlali

Present Status and Future Perspectives of the NEXT Experiment