6-12 Sept., 2004, Pylos

CR COMPOSITION AT THE BREAK AREA

Shaulov S.B., Cherdyntceva K.V., Chubenko A.P., Kokobaev M., Kruglov A.V., Krupchatnicova J.A.,

Nesterova N.M., Nicolskaya N.M., Pavluchenko V.P., Piscal V.V., Vildanov N.G., Vildanova L.I.

6-12 Sept., 2004, Pylos

Введение

Объявите цель доклада Представьтесь

6-12 Sept., 2004, Pylos

HADRONHADRON(Tien-Shan, 3340m)

Emulsion chambers

EAS array

6-12 Sept., 2004, Pylos

Dependencies <Nm>-Ne are compared for two groups of

EAS:-All EAS (~400 000)-EAS with families (~1700)-one EC (~6400)-two EC (2004)

Selection criteria:-EAS in circle R 20 m, with zenith angles

30°families at EC: еEeV,1 (1 ~70%)

6-12 Sept., 2004, Pylos

<N> - Ne dependencies

6-12 Sept., 2004, Pylos

What is strange here?

1. <N> - Ne dependencies coincide for two groups up to break and differ above them.

2. EAS+ are the proton events mainly and must have relatively small muon numbers, i.e.

<N> - Ne for EAS+ must lay under one for all EAS !!!

6-12 Sept., 2004, Pylos

This discrepancy with ordinary situation don’t depends of CR composition, because…

6-12 Sept., 2004, Pylos

Mix composition <

N>

Ne

Fe

Protons

- Protons with

6-12 Sept., 2004, Pylos

Possible methodical distortions

were checked:

1. Vertical moving EAS+ curve because of muon LDF difference for EAS and EAS+ -

absent as LDFs coincide2. Horizontal moving EAS+ curve because of Ne-E0 difference for EAS

and EAS+ - difference exists, but in opposite direction…

6-12 Sept., 2004, Pylos

Model (M. Tamada) E0-Ne for EAS and EAS+

6-12 Sept., 2004, Pylos

What does it means ?

1. Primary nuclei, consisting of nucleons, can’t generate EAS which have EC -quanta and relatively large <N> simultaniousely!

2. A new EAS component arise above the EAS spectrum break.

3. This component origin is unknown. - It may be part of primary CR (SQM-?) - It may be generated by CR nuclei at atmosphere (QGM-?)4. The experimental data permit to conclude

that we deal with not-nucleus component at area above EAS spectrum break!

6-12 Sept., 2004, Pylos

Ne spectrum for EAS+

Preliminary

EAS+

6-12 Sept., 2004, Pylos

Additional conclusions … It seams that the new experimental

method EAS+EC permits to resolve the break problem, so this kind experiment necessary to develop.

If a new component has an astrophysical origin and consists of SQM particles with mass ~1 TeV, then it may explains the absence of CR spectrum cut for energy ~51019 eV (GZK-effect).

6-12 Sept., 2004, Pylos