1,776 research outputs found
Angular momentum dependence of the GDR width in Sn nuclei at fixed excitation energy
Abstract High-energy Îł-rays from the decay of the giant-dipole resonance (GDR) in the hot 106Sn compound nucleus and its daughters were measured in coincidence with heavy recoiling evaporation residues. The compound nucleus was formed at excitation energy E â = 80 MeV using the reaction 56Ni+48Ti at a bombarding energy of 260 MeV. The analysis yields the GDR width for two different intervals of angular momentum ăJă = 24 and 36â. The present data, combined with previous data at higher angular momentum permit a study of the angular momentum dependence of the GDR width for 10 ⊽ J ⊽ 60â at approximately fixed temperature. The width of the GDR is found to be roughly constant for
Measurement of quarkonium production at forward rapidity in pp collisions at âs=7 TeV
The inclusive production cross sections at forward rapidity of J/Ď , Ď(2S) , ÎĽ (1S) and ÎĽ (2S) are measured in pp collisions at sâ=7 TeV with the ALICE detector at the LHC. The analysis is based on a data sample corresponding to an integrated luminosity of 1.35 pbâžÂš . Quarkonia are reconstructed in the dimuon-decay channel and the signal yields are evaluated by fitting the Îź+Îźâ invariant mass distributions. The differential production cross sections are measured as a function of the transverse momentum pT and rapidity y , over the ranges 0<pT<20 GeV/c for J/Ď , 0<pT<12 GeV/c for all other resonances and for \(2.5 . The measured cross sections integrated over pT and y , and assuming unpolarized quarkonia, are: ĎJ/Ď=6.69Âą0.04Âą0.63 Îź b, ĎĎ(2S)=1.13Âą0.07Âą0.19 Îź b, ĎÎĽ(1S)=54.2Âą5.0Âą6.7 nb and ĎÎĽ(2S)=18.4Âą3.7Âą2.9 nb, where the first uncertainty is statistical and the second one is systematic. The results are compared to measurements performed by other LHC experiments and to theoretical models
Event-by-event mean pT fluctuations in pp and PbâPb collisions at the LHC
Event-by-event fluctuations of the mean transverse momentum of charged particles produced in pp collisions at TeX TeX 0.9, 2.76 and 7 TeV, and PbâPb collisions at TeX TeX 2.76 TeV are studied as a function of the charged-particle multiplicity using the ALICE detector at the LHC. Dynamical fluctuations indicative of correlated particle emission are observed in all systems. The results in pp collisions show little dependence on collision energy. The Monte Carlo event generators PYTHIA and PHOJET are in qualitative agreement with the data. Peripheral PbâPb data exhibit a similar multiplicity dependence as that observed in pp. In central PbâPb, the results deviate from this trend, featuring a significant reduction of the fluctuation strength. The results in PbâPb are in qualitative agreement with previous measurements in AuâAu at lower collision energies and with expectations from models that incorporate collective phenomena
UPAYA MENINGKATKAN MOTIVASI BELAJAR SISWA MELALUI MEDIA GAME EDUCATION DALAM PEMBELAJARAN IPS DI MTs HASBUR RACHMAN ALIF DESA LENGKONG WETAN KABUPATEN MAJALENGKA
ASEP SAMSUL MA'ARIF :
Berdasarkan Observasiawal di kelas VII MTs Hasbur Rachman Alif terlihat
proses pembelajaran IPS masih menggunakan media spidol dan papan tulis. Sehingga
banyak siswa yang kurang memperhatikan guru pada saat proses pembelajaran., Hal
ini berakibat pada kejenuhan dan kebosanan yang berdampak pada hasil belajar siswa
yang kurang dari KKM yang diterapkan di MTs Hasbur Rachman Alif yakni 70.
Tujuan penelitian ini untuk mengetahui bagaimana penerapan pembelajaran
dengan menggunakan media Game Education pada mata pelajaran IPS Terpadu,
aktivitas siswa dan kinerja guru dengan pembelajaran dengan menggunakan media
Game Education, dan mengetahui motivasi belajar siswa sebelum dan setelah
diterapkannya pembelajaran dengan menggunakan media Game education pada mata
pelajaran IPS Terpadu di MTs Hasbur Rachman Alif.
Pembelajaran dengan menggunakan media Game Education menekankan
motivasi siswa untuk berpikir kritis dan menuangkan. Hal ini memudahkan siswa
untuk mengakses materi IPS yang banyak dimanapun, serta mempemudah daya
ingat siswa tentang apayatgtelah didapatkan selama proses pembelajaran.
Penelitian ini menggunakan Penelitian Tindakan Kelas (pTK) yang
dilaksanakan selama tiga siklus. Teknik Pengumpulan data menggunakan observasi,
tes, dan dokumentasi. Subjek penelitian ini adalah siswa kelas VII MTs Hasbur
Rachman Alif sebanyak 31 siswa yang terdiri dari 18 siswa laki-laki dan 13 siswa
perempuan.
Pembelajaran dengan menggunakan media Game Education dapat
meningkatkan motivasi belajar siswa hal ini terlihat dari hasil tes yang telah
dilakukan selama tiga siklus, dimana pada pratindakan (pretes) nilai sebesar 65,25
dan ketuntasan belajar 25 yo, siklus I nilai rata-rata sebesar 76,75 dan ketuntasan_
belajar siswa sebesar 65,5%o siklus II nilai rata-rata siswa 85,75 dan nilai ketuntasan
belajar sebesar 90% siklus III dengan nilai rata-rata 92,25 dan ketuntasan belajar
mengalami peningkatanya itu 97,5yo. Dengan demikian dapat disimpulkan bahwa
pembelajaran dengan menggunakan media Game Education merupakan salah satu
upaya untuk meningkatkan hasil belajar siswa pada mata pelajaran IPS Terpadu di
MTs Hasbur Rachman Alif.
Kata Kunci: Game Education, MotivasiBelajar, PTK
Production of charged pions, kaons and protons at large transverse momenta in pp and Pb-Pb collisions at = 2.76 TeV
Transverse momentum spectra of and up to = 20 GeV/c at mid-rapidity, |y| 0.8, in pp and Pb-Pb collisions at = 2.76 TeV have been measured using the ALICE detector at the LHC. At intermediate (2-8 GeV/c) an enhancement of the proton-to-proton ratio, (p + \bar{p})/(\pi^+ + \pi^-\(), with respect to pp collisions is observed and the ratio reaches 0.80 in central Pb-Pb collisions. The measurement of the nuclear modification factors for \(\pi^{\pm}, K^{\pm} and indicates that within the systematic and statistical uncertainties they are the same at high (> 10 GeV/c), suggesting that the chemical composition of leading particles from jets in the medium is similar to that of vacuum jets.publishedVersio
Suppression of Ď(2S) production in p-Pb collisions at âsNN=5.02 TeV .
The ALICE Collaboration has studied the inclusive production of the charmonium state Ď(2S) in proton-lead (p-Pb) collisions at the nucleon-nucleon centre of mass energy âsNN = 5.02TeV at the CERN LHC. The measurement was performed at forward (2.03 < ycms < 3.53) and backward (â4.46 < ycms < â2.96) centre of mass rapidities, studying the decays into muon pairs. In this paper, we present the inclusive production cross sections Ď (2S), both integrated and as a function of the transverse momentum pT, for the two ycms domains. The results are compared to those obtained for the 1S vector state (J/Ď), by showing the ratios between the production cross sections, as well as the double ratios [Ď (2S)/ĎJ/ ]pPb/[Ď (2S)/ĎJ/ ]pp between p-Pb and proton-proton collisions. Finally, the nuclear modification factor for inclusive Ď(2S) is evaluated and compared to the measurement of the same quantity for J/Ď and to theoretical models including parton shadowing and coherent energy loss mechanisms. The results show a significantly larger suppression of the Ď(2S) compared to that measured for J/Ď and to models. These observations represent a clear indication for sizeable final state effects on Ď(2S) production
Measurement of the Cross Section for Electromagnetic Dissociation with Neutron Emission in Pb-Pb Collisions at âsNN = 2.76 TeV
The first measurement of neutron emission in electromagnetic dissociation of 208Pb nuclei at the LHC is presented. The measurement is performed using the neutron Zero Degree Calorimeters of the ALICE experiment, which detect neutral particles close to beam rapidity. The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at âsNN = 2.76 TeV with neutron emission are Ď_single EMD = 187.2Âą0.2 (stat.) +13.8â12.0 (syst.) b and Ď_mutual EMD = 6.2 Âą 0.1 (stat.) Âą0.4 (syst.) b respectively. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model.publishedVersio
Measurement of charm and beauty production at central rapidity versus charged-particle multiplicity in proton-proton collisions at = 7 TeV
Prompt D meson and non-prompt J/ yields are studied as a function of the multiplicity of charged particles produced in inelastic proton-proton collisions at a centre-of-mass energy of TeV. The results are reported as a ratio between yields in a given multiplicity interval normalised to the multiplicity-integrated ones (relative yields). They are shown as a function of the multiplicity of charged particles normalised to the average value for inelastic collisions (relative charged-particle multiplicity). D\)^0\), D\)^+\) and D\)^{*+}\) mesons are measured in five intervals from 1 to 20 GeV/ and for GeV/ and , The fraction of non-prompt J/ in the inclusive J/ yields shows no dependence on the charged-particle multiplicity at central rapidity. Charm and beauty hadron relative yields exhibit a similar increase with increasing charged-particle multiplicity. The measurements are compared to PYTHIA 8, EPOS 3 and percolation calculations.publishedVersio
Multiplicity dependence of the average transverse momentum in pp, p-Pb, and Pb-Pb collisions at the LHC
The average transverse momentum versus the charged-particle multiplicity was measured in p-Pb collisions at a collision energy per nucleon-nucleon pair = 5.02 TeV and in pp collisions at collision energies of = 0.9, 2.76, and 7 Tev in the kinematic range 0.15 with is observed, which is much stronger than that measured in Pb-Pb collisions. For pp collisions, this could be attributed, within a model of hadronizing strings, to multiple-parton interactions and to a final-state color reconnection mechanism. The data in p-Pb and Pb-Pb collisions cannot be described by an incoherent superposition of nucleon-nucleon collisions and pose a challenge to most of the event generators.publishedVersio
Energy dependence of the transverse momentum distributions of charged particles in pp collisions measured by ALICE
Differential cross sections of charged particles in inelastic pp collisions as a function of have been measured at = 0.9, 2.76 and 7 TeV at the LHC. The spectra are compared to NLO-pQCD calculations. Though the differential cross section for an individual cannot be described by NLO-pQCD, the relative increase of cross section with is in agreement with NLO-pQCD. Based on these measurements and observations, procedures are discussed to construct pp reference spectra at = 2.76 and 5.02 TeV up to = 50 GeV/c as required for the calculation of the nuclear modification factor in nucleus-nucleus and proton-nucleus collisions.publishedVersio
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