Magnetic monopole searches in the cosmic radiation

There has been a big effort in the past twenty years with at least a couple of generations of experiments which searched for supermassive GUT magnetic monopoles in the cosmic radiation. Here a short review of these searches is given, together with a brief description of the theoretical framework and of the detection techniques

Nuclear re-interaction effects in quasi-elastic neutrino nucleus scattering

The quasi-elastic neutrino-nucleus cross section has been calculated by using a Fermi gas model corrected to consider the re-scattering between the emitted nucleon and the rest nucleus. As an example of the relevance of this effect we show results for the muon production cross section on 16O target.Comment: 7 pages, 4 Postscript figures, Contribution to NuInt01 Workshop, KEK, Tsukuba, Japa

Multiscale image analysis applied to gamma/hadron discrimination for VHE gamma-ray astronomy with ARGO-YBJ

Intrinsic differences in the processes involved in the development of electromagnetic and hadronic showers in the atmosphere have been evidenced by means of a careful analysis of the event image given by the ARGO-YBJ detector. The images have been analyzed at different length scales and their multifractal nature has been studied. The use of the multiscale approach together with a properly designed and trained Artificial Neural Network, allowed us to obtain a good gamma/hadron discrimination power. If confirmed by further studies on different event cathegories, this result would allow to nearly double the detector sensitivity to gamma ray sources.Comment: 10 pages, 5 figures, Presented at the "Incontro Nazionale di Astrofisica delle Alte Energie", Rome 15-16 May 200

Interactions of Cosmic Rays in the primary energy range (0.1-1) PeV studied by the ARGO-YBJ Experiment

The ARGO-YBJ detector layout, features and location offer a unique possibility for a detailed study of several characteristics of the hadronic component of the cosmic ray flux in an energy range hardly accessed by direct measurements. The proton-air cross section has already been measured by ARGO-YBJ in an energy region up to ~ 100 TeV where the primary cosmic ray composition is sufficiently well known for that measure to be unbiased. The analog readout of the RPC signals now provides new tools to measure the lateral distribution of particle density (LDF) as close as a few meters from the core and to investigate with unprecedented resolution the shower time structure. This allows to extend the hadronic interaction and mass composition studies up to ~PeV energies in the laboratory rest frame. Moreover, it is shown that the LDF of detected showers can be properly described, even very close to the shower axis, by a NKG-like function, whose shape parameter is clearly related to the shower age and can be used for studying the mass composition of cosmic rays

Very High Energy Gamma-Ray Astronomy and Cosmic Ray Physics with ARGO-YBJ

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Pembelajaran Fisika dengan Penggunaan Kit IPA Ditinjau dari Keterampilan Proses dan Sikap Ilmiah Siswa Kelas X SMA Dharma Loka Pekanbaru

This research aims to describe outcome of process skills and scientific attitudes students in tenth grade of Dharma Loka Senior High School Pekanbaru using KIT IPA on Matter and Heat topic. The method used in this research is Pre-Experimental Design and was conducted by the research design One Shot Case Study. Data collection instrument in this research is the process skills test and scientific attitude questioners. Analysis of the data in this research is a descriptive analysis for describe process skills and scientific attitudes. From the analysis of process skills data showed: the average absorption is 82 % with good category; effectiveness is 82% is categorized effective learning; completeness learning material is 100% with complete category. While analysis of the data in scientific attitudes is 81% with very good category. So it can conclude that outcome of process skills and scientific attitudes students in tenth grade of Dharma Loka Senior High School Pekanbaru using KIT IPA at Matter and Heat topic is very good

Kemampuan Pemecahan Masalah Siswa dengan Penerapan Modeling Instruction pada Konsep Listrik Dinamis

This research aims to describe the problem solving skill of student in class X-7 SMA Negeri 5 Pekanbaru with the implementation of Modeling Instruction in lesson dynamic electric. The research used pre-experimental with one-shot case study design.The subjects were students of class X-7 totalling 39 students, consisting of 16 male students and 23 female students. The instrument of data collection in this study is the problem solving ability test consists of 5 essay questions. Analysis of the data in this study is a descriptive analysis to see an overview of the problem solving skill of student by using the criteria of the level of problem solving skills . The research showed the problem solving skill of student in class X-7 SMA Negeri 5 Pekanbaru with the implementation of Modeling Instruction in lesson dynamic electric are at a medium level (67,46%). Therefore in teaching physics, by using Modeling Instruction could train problem solving skill of student