23

rd

ECRS-2012 SINP, MSU, Moscow, 3-7 July, 2012

Poster reviewing Primary CR_1: E<1PeV (38 posters)

Piero Spillantini, University and INFN, Firenze, Italy 1

Outline

1) Data and data analysis

with

Pamela

pcr_1_353,383,452,473,477,641,643,659 with

ARGO-YBJ

pcr_1_389,476 with

ATIC-2

pcr_1_456 with

Doch-4A

pcr_1_536,537 with

Carpet-2

pcr_1_576 ‘

Fractionally charged’

pcr_1_733

2) Instruments and methods New project

pcr_1_319,

Prototypes

pcr_1_527, 544, 556

Status

pcr_1_391,538

New methods

cr_1_541,549,623,627,638,723,724

3) Theory and Phenomenology

pcr_1_165,184,196,464,516,518,571,665 2

Data and data analysis: PAMELA

353 -stand-alone trigger in calorimeter  - reconstruction by multistep fitting - isotropy map creation (5 ° x5 ° ) GF: 20  600 cm2sr  3000 ev in 5y

383 -Work in progress on identification capability for light nuclei isotopes with multiple de/dx in cal.

- expect provide new data of 6Li, 7Li, 7Be and 9Be, separation 9Be-10Be seems possible

452 -DRD model fit better e+ flux at low energies - PD and DR models fail to describe data et al.

Slow-down effect 473 TOF stand-alone Calorimeter stand-alone

477 -Improvements of the d identification  enhanced p suppression + decrease systematics - improvements: truncated mean values of de/dx in tracker + added de/dx in 6 TOF counters

641 -PAMELA covers full sky  search for global anisotropies possible - search at large scale anisotropies (30 ° -90 ° ) for e- and e+ with E>40 GeV + around SUN direction - preliminary: arrival directions consistent with isotropic expectation

643 -L-shell 1.12-1.5 available for PAMELA, peak of pitch-angular distribution is narrow - angular resolution <4 ° , e>60 MeV, 5 year statistics - measured quasitrapped on boundary of rad belts ane HE (>1GeV) trapped and quasi-trapped -- result: p, e-, e+ local and equatorial pitch-angular distributions

659 -Antip selection with Multivariate analysis - increased statistics (2800 antip) and energy range

Data and data analysis: other

389 -Data with zenith<15 ° and core in 40x40 m2, correlation with pressure and temperature - CR generated in 100 GeV-4PeV, shower simulated by CORSIKA - medium energy p 4.5-56 TeV, He 9-90 TeV

476

-Arrival direction  information on source distribution + propagation medium + diffusion - anisotropy 10 -4 -10 -3 in TeV CR arrival direction in angular scalea 10 ° -180 ° - new details of CR distribution in 10 ° -70 °

456 (Ti+V+Cr)/Fe (Z=16-24)/Fe -Upturn can be understood with CG+B (B: bubble with embedded sources) model - Upturn near 200-300 GeV/n predicted but index 2.5

536 -Continous operation of ‘Doch-4M,A’ could not reproduce ‘Erzions’ found in Doch-4 in 1999 - many material used to convert neutral Erzions in charged detectable Erzions - New device used in 2012 once was not able to reproduce previous results

537

576

733 - In Aragats a group of 4e/3 charge events with HE (>80GeV) - In ATIC-2 ‘additional events’ with ionization 0.53 of proton

Projects, instruments, New methods

527

-Prototype of PRISMA project, run on the NEVOD basis - 32 new type ‘en.detectors’ sensitive to em component and hadrons (through thermal n).

thin inorganic scintillator (ZnS(Ag) + LiF enriched with 6 Li) sensitive to thermal n (fast response, 50 photoelectron per n-capture) - Seeking EAS core position, size (Nn) and age (using em component)

319 Mass 650 kg Power 650 W Launch date FY 2014 Launch carrier HTV-5 SIA Electronics 120 Acceptance: 0.12 m2sr e, p-Fe 0.10 gammas 0.40 ultra heavy nuclei IMC TASC Energy resolution: 2% e, gammas @ E>100 GeV 40% p @ 1TeV 30% nuclei @ 50 GeV/n Angular resolution <1 ° Charge resolution 0.15-0.30 for Z=2-26 e/p rejection power 10 5 - Can identify possible signatures from nearly SNRs (e.g. Vela) in e spectrum -Has the potential to detect e and gamma signals from dark matter annihilation/decay With excellent energy resolution 2% -Can measure the spectra of individual elements in CRs with unprecedented accuracy Approaching the ‘knee’ region -Ultra heavy nuclei up to Z=40 in 5 y - B/C up to 5TeV/n (5y)

544 -Low/moderate solar activity in June 2011: used to investigate response large modular CR det.

- smart design: assembling new CR monitors with He counters in different length - registered intensity well accounts for the macro prturbations in near Earth Space

556 -New kind of track-pits, with specific pit-form and very small size - CN-85 exposed on satellite in 1995 - considered very short (<3 m m) tracks (solar protons and stopping recoil nuclei) - from layer-to-layer investigation: a three of pit swarm correlated with the end of the track formed by high ionizinf primary charged particles (stopping of oegative charged Herzions?)

391 Deployed on ISS and taking data from May 2011 - tracker: expected behavior, stable on temperature, pedestals, noise

538 - 3 well known counters BP28 + 12 new model LND2061 - Preliminary: the two types are compatible - New acquisition board used

541 -Study of EAS offers a unique way to extract p-air interaction cross section -Pointed out some limitation of standard technique -New approach involving simultaneous measurement of absorption of EAS and attenuation of electron component is proposed

549

623

627

638 (n) (p) - GEANT4 simulation framework PLANETOCOSMICS - Good agreement with Data

724 - One half of p events had no track in the EC -New geometrical reconstruction tested on ¼ of events -Both methods give the same result -An unknown component could be present in the primary particle flux -Processing of additional events necessary to obtain significant data

Theory and computations

165 Hig energy neutrons used for investigating gas and dust in Kuiper belt

184 -Atmosf. Antip and antin (5-300 g/cm2) by CORSIKA - Hadronic interactions SYBILL & FLUKA - Match well BESS-2001 in 1-3GeV Antip and antin

196

464 464 --First order Fermi diffuse shock acceleration unifying factor production HE particles -Differential index determined by Mach number (2.5 for CR) -Knee due to decreasing number of sources for >10 14 eV -Spectrum calculated by solving first-order Fredhom equation comprising convolution of first Fermi equation with increasing particle rigidity

516 -Fractional diffusion model to describe propagation from sources -e- and e+ injected by sma sources wityh same index (2.85) -e+/e increases to 0.22 for >100GeV

518 -Proposed an Anomalous Diffusion (AD) model for solving the ‘knee’ problem -Anomaly from large paths length between magnetic domains An 5 y sources defines spectrum and provide knee -Behavior of H/He observed by PAMELA reproduced

571 -Proposed an Anomalous Diffusion (AD) model for solving the ‘knee’ problem -Simulationof random walk processes in one-dimensional case -p(r) distribution from MC agrees with analitical solution (fig.1) -p(r) at different times -Finitness of velocity on shape is neglegible

665