Non-collective excitations in low-energy heavy-ion reactions: applicability of the random-matrix model

We investigate the applicability of a random-matrix model to the description of non-collective excitations in heavy-ion reactions around the Coulomb barrier. To this end, we study fusion in the reaction $^{16}$O + $^{208}$Pb, taking account of the known non-collective excitations in the $^{208}$Pb nucleus. We show that the random-matrix model for the corresponding couplings reproduces reasonably well the exact calculations, obtained using empirical deformation parameters. This implies that the model may provide a powerful method for systems in which the non-collective couplings are not so well known.Comment: 6 pages, 4 figure

Role of non-collective excitations in low-energy heavy-ion reactions

We investigate the effect of single-particle excitations on heavy-ion reactions at energies near the Coulomb barrier. To this end, we describe single-particle degrees of freedom with the random matrix theory and solve the coupled-channels equations for one-dimensional systems. We find that the single-particle excitations hinder the penetrability at energies above the barrier, leading to a smeared barrier distribution. This indicates that the single-particle excitations provide a promising way to explain the difference in a quasi-elastic barrier distribution recently observed in $^{20}$Ne + $^{90,92}$Zr systems.Comment: 8 pages, 7 figure

Subbarrier fusion reactions with dissipative couplings

Using the random matrix model, we discuss the effect of couplings to non-collective states on the penetrability of a one dimensional potential barrier. We show that these non-collective excitations hinder the penetrability and thus smear the barrier distribution at energies above the barrier, while they do not affect significantly the penetrability at deep subbarrier energies. The energy dependence of the Q-value distribution obtained with this model is also discussed.Comment: 4 pages, 2 figures. A talk given at the 10th international conference on nucleus-nucleus collisions (NN2009), Aug. 16-21, 2009, Beijing, Chin

Role of non-collective excitations in heavy-ion fusion reactions and quasi-elastic scattering around the Coulomb barrier

Despite the supposed simplicity of double-closed shell nuclei, conventional coupled-channels calculations, that include all of the known collective states of the target and projectile, give a poor fit to the fusion cross section for the $^{16}$O + $^{208}$Pb system. The discrepancies are highlighted through the experimental barrier distribution and logarithmic derivative, that are both well defined by the precise experimental fusion data available. In order to broaden our search for possible causes for this anomaly, we revisit this system and include in our calculations a large number of non-collective states of the target, whose spin, parity, excitation energy and deformation paramter are known from high-precision proton inelastic-scattering measurements. Although the new coupled-channels calculations modify the barrier distribution, the disagreemnt with experiment remains both for fusion and for quasi-elastic (QE) scattering. We find that the Q-value distributions for large-angle QE scattering become rapidly more important as the incident energy increases, reflecting the trend of the experimental data. The mass-number dependence of the non-collective excitations is discussed.Comment: 8 pages, 7 figure

Thermal Transport Imaging in the Quantum Hall Edge Channel

Research focused on heat transport in the quantum Hall (QH) edge channel has successfully addressed fundamental theoretical questions surrounding the QH physics. However, the picture of the edge channel is complicated by the phenomenon of energy dissipation out of the edge, and theories treating this dissipation are lacking. More experimental data is also needed to determine the coupling mechanism by which energy leaves the edge channel. We developed a method to map the heat transport in the QH edge to study the dissipation of heat. We locally heated the QH edge and locally detected the temperature increase while continuously varying the distance between heater and thermometer. We thereby obtained the thermal decay length of the edge state, which we found to depend on magnetic field strength

Hak Ingkar Notaris Sebagai Wujud Perlindungan Hukum

Notaris merupakan perpanjangan tangan dari pemerintah yang diberikan kewenangan menjalankan sebagian tugas negara yaitu menerbitkan alat bukti tertulis berupa akta autentik, di mana notaris memperoleh keterangan dari para pihak yang mempercayakan segala keterangannya kepada notaris oleh karena itu jabatan notaris merupakan jabatan kepercayaan. Selaku pejabat umum, notaris tidak saja terikat pada peraturan jabatan tetapi juga terikat pada sumpah jabatannya dimana notaris wajib merahasiakan isi akta dan segala keterangan yang diperolehnya. Seiring dengan perkembangan jaman, seringkali notaris dipanggil untuk dimintai keterangan sebagai saksi terkait dengan akta yang dibuat dihadapannya. Berdasarkan Putusan MKRI Nomor 49/PUU-X/2012 yang menghapuskan frase dengan persetujuan Majelis Pengawas Daerah (MPD) Wewenang MPD dalam memberikan perlindungan kepada notaris menjadi sirna. Terkait dengan hal tersebut maka berdasarkan ketentuan Pasal  66 UUJN-P UU No. 2 Tahun 2014 dibentuklah Majelis Kehormatan Notaris (MKN),yang salah satu fungsinya memberikan jawaban menolak atau memberi persetujuan terhadap pemanggilan notaris. Jika lewat dari batas waktu yang ditentukan maka MKN dianggap menyetujui notaris tersebut untuk diperiksa. Persetujuan dari MKN ini dapat dijadikan kunci pembuka dari pengajuan Hak Ingkar. Kata Kunci : Akta Autentik, Perlindungan Hukum, Hak Ingkar Notaris