Nuclear Experiment·nucl-ex
5 papers—1 primary·4 cross-listed·reconstructed*
The absolute cross section for the complete fusion and the total reaction cross section as a function of the charge of the heavy residue have been indirectly estimated for the reaction O+C at 16.7 MeV/nucleon. Data have been collected with the GARFIELD+RCo setup at LNL (Italy). The mbarn/count normalization factor has been extracted using the statistical model HF (Hauser-Feshbach light).
Haibo Yang🇨🇳 · Qidong Wang🇨🇳 · Guofu Cao🇨🇳 · Kali M. Melby🇺🇸 · Khadouja Harouaka🇺🇸 · Isaac J. Arnquist🇺🇸 · Fengwei Dai🇨🇳 · Liqiang Cao🇨🇳 · Liangjian Wen🇨🇳
It is of great importance to develop a photodetector system with an ultralow radioactivity background in rare event searches. Silicon photomultipliers (SiPMs) and application-specific integrated circuits (ASICs) are two ideal candidates for low background photosensors and readout electronics, respectively, because they are mainly composed of silicon, which can achieve good radio-purity without considerable extra effort. However, interposers, used to provide mechanical support and signal routes between the photosensor and the electronics, are a bottleneck in building ultralow background photodetectors. Silicon and quartz are two candidates to construct the low background interposer because of their good radio-purity; nevertheless, it is non-trivial to produce through silicon vias (TSV) or through quartz vias (TQV) on the large area silicon or quartz wafer. In this work, based on double-sided TSV interconnect technology, we developed the first prototype of a silicon interposer with a size of 10~cm10~cm and a thickness of 320~m. The electrical properties of the interposer are carefully evaluated at room temperature, and its performance is also examined at -110~C with an integrated SiPM on the interposer. The testing results reveal quite promising performance of the prototype, and the single photoelectron signals can be clearly observed from the SiPM. The features of the observed signals are comparable with those from the SiPM mounted on a normal FR4-based PCB. Based on the success of the silicon interposer prototype, we started the follow-up studies that aimed to further improve the performance and yield of the silicon interposer, and eventually to provide a solution for building an ultralow background photodetector system.
Eckart Grosse · Arnd.R. Junghans🇩🇪
Although most nuclear spectroscopy as well as atomic hyperfine structure data do not deliver accurate information on nuclear axiality the ad-hoc assumption of symmetry about one axis found widespread use in nuclear model calculations. In the theoretical interpretation of nuclear properties as well as in the analysis of experimental data triaxiality was considered - if at all - only for some, often exotic, nuclides. A breaking of axial symmetry combined to a spin-independent moment of inertia results in a surprisingly simple heuristic triaxial parametrization of the yrast sequence in all heavy nuclei, including well deformed ones. No additional fit parameters are needed in detailed studies of the mass and charge dependence of the electric dipole strength in the range of and outside of giant dipole resonances. Allowing triaxiality also avoids the introduction of an arbitrary level density parameter ā to fit the accurate values observed in n-capture experiments and ā can be taken from nuclear matter studies. A combination of this value to the yrast energies no longer based on axiality and the related I(I+1) rule results in agreement to data independent of spin. And predictions for radiative neutron capture as derived on the basis of non-axiality are improved as well. The experimentally favoured broken axial symmetry is in accord to HFB and MC-shell model calculations already for nuclei in the valley of stability.
F. Bock (50) · N. Schmidt (50) · P.K. Wang (24) · N. Santiesteban (38) · T. Horn (13) · J. Huang (5) · J. Lajoie (27) · C. Munoz Camacho (24) · J. K. Adkins (37) · Y. Akiba (54 and 58) · A. Albataineh (73) · M. Amaryan (48) and 276 other authors
We describe the design and performance the calorimeter systems used in the ECCE detector design to achieve the overall performance specifications cost-effectively with careful consideration of appropriate technical and schedule risks. The calorimeter systems consist of three electromagnetic calorimeters, covering the combined pseudorapdity range from -3.7 to 3.8 and two hadronic calorimeters. Key calorimeter performances which include energy and position resolutions, reconstruction efficiency, and particle identification will be presented.
Ryohei Matsumiya🇨🇦 · Hiroaki Akatsuka🇯🇵 · Chris P. Bidinosti · Charles A. Davis🇬🇧 · Beatrice Franke🇨🇦 · Derek Fujimoto🇨🇦 · Michael T. W. Gericke🇨🇦 · Pietro Giampa🇨🇦 · Robert Golub🇺🇸 · Sean Hansen-Romu🇨🇦 · Kichiji Hatanaka🇯🇵 · Tomohiro Hayamizu and 36 other authors
The TRIUMF Ultra-Cold Advanced Neutron (TUCAN) collaboration aims at a precision neutron electric dipole moment (nEDM) measurement with an uncertainty of , which is an order-of-magnitude better than the current nEDM upper limit and enables us to test Supersymmetry. To achieve this precision, we are developing a new high-intensity ultracold neutron (UCN) source using super-thermal UCN production in superfluid helium (He-II) and a nEDM spectrometer. The current development status of them is reported in this article.
* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.