Extracting constraints from direct detection searches of supersymmetric dark matter in the light of null results from the LHC in the squark sector

The comparison of the results of direct detection of Dark Matter, obtained with various target nuclei, requires model-dependent, or even arbitrary, assumptions. Indeed, to draw conclusions either the spin-dependent (SD) or the spin-independent (SI) interaction has to be neglected. In the light of the null results from supersymmetry searches at the LHC, the squark sector is pushed to high masses. We show that for a squark sector at the TeV scale, the framework used to extract contraints from direct detection searches can be redefined as the number of free parameters is reduced. Moreover, the correlation observed between SI and SD proton cross sections constitutes a key issue for the development of the next generation of Dark Matter detectors.Comment: Figure 3 has been updated. Conclusions unchange

In situ measurement of the electron drift velocity for upcoming directional Dark Matter detectors

Three-dimensional track reconstruction is a key issue for directional Dark Matter detection and it requires a precise knowledge of the electron drift velocity. Magboltz simulations are known to give a good evaluation of this parameter. However, large TPC operated underground on long time scale may be characterized by an effective electron drift velocity that may differ from the value evaluated by simulation. In situ measurement of this key parameter is hence needed as it is a way to avoid bias in the 3D track reconstruction. We present a dedicated method for the measurement of the electron drift velocity with the MIMAC detector. It is tested on two gas mixtures: CF4 and CF4 + CHF3. The latter has been chosen for the MIMAC detector as we expect that adding CHF3 to pure CF4 will lower the electron drift velocity. This is a key point for directional Dark Matter as the track sampling along the drift field will be improved while keeping almost the same Fluorine content of the gas mixture. We show that the drift velocity at 50 mbar is reduced by a factor of about 5 when adding 30% of CHF3.Comment: 19 pages, 14 figures. Minor corrections, matches published version in JINS

Measurement of the electron drift velocity for directional dark matter detectors

Three-dimensional track reconstruction is a key issue for directional Dark Matter detection. It requires a precise knowledge of the electron drift velocity. Magboltz simulations are known to give a good evaluation of this parameter. However, large TPC operated underground on long time scale may be characterized by an effective electron drift velocity that may differ from the value evaluated by simulation. In situ measurement of this key parameter is hence a way to avoid bias in the 3D track reconstruction. We present a dedicated method for the measurement of the electron drift velocity with the MIMAC detector. It is tested on two gas mixtures : $\rm CF_4$ and $\rm CF_4+CHF_3$. We also show that adding $\rm CHF_3$ allows us to lower the electron drift velocity while keeping almost the same Fluorine content of the gas mixture.Comment: Proceedings of the 4th international conference on Directional Detection of Dark Matter (CYGNUS 2013), 10-12 June 2013, Toyama, Japa

MIMAC: MIcro-tpc MAtrix of Chambers for dark matter directional detection

Directional detection of non-baryonic Dark Matter is a promising search strategy for discriminating WIMP events from neutrons, the ultimate background for dark matter direct detection. This strategy requires both a precise measurement of the energy down to a few keV and 3D reconstruction of tracks down to a few mm. The MIMAC (MIcro-tpc MAtrix of Chambers) collaboration has developed in the last years an original prototype detector based on the direct coupling of large pixelized micromegas with a special developed fast self-triggered electronics showing the feasibility of a new generation of directional detectors. The first bi-chamber prototype has been installed at Modane, underground laboratory in June 2012. The first undergournd background events, the gain stability and calibration are shown. The first spectrum of nuclear recoils showing 3D tracks coming from the radon progeny is presented.Comment: Proceedings of the 4th International Conference on Directional Dark Matter Detection CYGNUS2013, held in Toyoma (Japan), June 201

PENINGKATAN PRESTASI BELAJAR MATA PELAJARAN AKUNTANSI DENGAN METODE PEMBELAJARAN KOOPERATIF TIPE TEAM GAME TOURNAMENT (TGT) PADA SISWA KELAS XI SMA NEGERI 1 KARTASURA TAHUN AJARAN 2009/2010 (Penelitian Tindakan Kelas)

Tujuan Penelitian ini adalah untuk meningkatkan prestasi belajar mata pelajaran akuntansi dengan metode pembelajaran kooperatif tipe Team Game Tournament (TGT) pada siswa kelas XI SMA Negeri 1 Kartasura tahun ajaran 2009/2010. Penelitian ini menggunakan metode Penelitian Tindakan Kelas (PTK). Obyek penelitian adalah siswa kelas XI IPS 4 SMA Negeri 1 Kartasura yang berjumlah 46 siswa. Penelitian ini dilaksanakan dengan kolaborasi antara guru kelas, peneliti, dan melibatkan siswa. Teknik pengumpulan data yang dilakukan dengan observasi, wawancara, angket, tes dan dokumentasi. Prosedur penelitian meliputi 6 tahap, yaitu: (1) identifikasi masalah, (2) persiapan tindakan, (3) penyusunan rencana tindakan, (4) implementasi tindakan, (5) pengamatan, dan (6) penyusunan laporan. Proses penelitian ini dilaksanakan dalam dua siklus, masing-masing siklus terdiri dari empat tahap, yaitu: (1) perencanaan tindakan, (2) pelaksanaan tindakan, (3) observasi dan interprestasi, dan (4) analisis dan refleksi. Setiap siklus dilaksanakan dalam tiga kali pertemuan, selama 6 x 45 menit. Berdasarkan hasil penelitian dapat disimpulkan bahwa terdapat peningkatan prestasi balajar mata pelajaran akuntansi dengan metode pembelajaran kooperatif tipe Team Game Tournament (TGT) pada siswa kelas XI SMA Negeri 1 Kartasura tahun ajaran 2009/2010. Hal tersebut terefleksi dari beberapa indikator sebagai berikut: (1) Motivasi berprestasi siswa meningkat sebesar 5,43% dari 79,70% pada siklus pertama menjadi 85,13% pada siklus kedua, (2) Siswa semakin antusias, berpartisispasi dalam pembelajaran dan bersemangat pada saat pemberian apersepsi, penjelasan materi dan diskusi kelompok sebesar 68,93% pada siklus pertama menjadi 78% pada siklus kedua, (3) Siswa semakin antusias, berpartisispasi dalam pembelajaran dan bersemangat pada saat pelaksanaan turnamen sebesar 66,67% pada siklus pertama menjadi 71,43% pada siklus kedua, (4) Siswa semakin antusias, berpartisispasi dalam pembelajaran dan bersemangat pada saat pelaksanaan evaluasi individu sebesar 69,22% pada siklus pertama menjadi 73,65% pada siklus kedua, (5) Adanya peningkatan prestasi belajar siswa sebesar 10,87%, dari 84,78% sebanyak 39 siswa pada siklus pertama meningkat menjadi 44 siswa sebesar 95,65% pada siklus kedua. Peningkatan tersebut terjadi setelah guru melakukan beberapa upaya, antara lain: (1) Guru sudah menerapkan metode Team Game Tournament (TGT) dan mengelola kelas dengan cukup baik, hal tersebut dapat dilihat dari: (a) kemampuan guru dalam meningkatkan motivasi berprestasi siswa melalui pembelajaran dengan metode Team Game Tournament (TGT), (b) kemampuan guru dalam memotivasi siswa untuk berpartisipasi aktif dalam proses pembelajaran yang berlangsung, (c) guru sudah dapat meningkatkan rasa tanggung jawab dan kompetisi dalam diri siswa, guna meningkatkan prestasi belajar siswa dalam kegiatan belajar mengajar melalui game tournament; (2) Guru menyadari perlunya melakukan suatu evaluasi terhadap proses pembelajaran, agar segala kelemahan yang ada dapat teratasi dengan baik dan tidak terulang dalam proses pembelajaran berikutnya