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Systematic investigation of E1 strength below Sn in the tin isotopic chain using the (d,pγ) reaction
Get PDFWhile the general properties of the electric dipole (E1) strength below the neutron separation energy are well known, there are still open questions about its underlying structure. In a previous 119Sn(d,pγ) experiment, a grouping of the Pygmy Dipole Resonance was observed depending on the excited 1 particle - 1 hole structures. This prompted similar investigations on the other applicable isotopes, 115,117Sn. Here, first results and a comparison to (γ, γ′) data are presented
Beyond mean field model for Gamow-Teller giant resonances and β decay
Get PDFThe Gamow-Teller (GT) transitions in four magic nuclei 48Ca, 90Zr, 132Sn, and 208Pb are studied by self-consistent Hartree-Fock (HF) plus charge- exchange subtracted second random phase approximation (SSRPA) model with sev- eral Skyrme energy density functions (EDFs). These calculations show that SSRPA improves systematically the description of main GT strength distributions in terms of the excitation energy and the peak height. The quenching factors are evaluated to be 13-20% of the Ikeda sum rule for 48Ca, 90Zr, and 132Sn, due to the couplings to two particle-two hole (2p-2h) configurations. The effect of tensor interaction on the β decay half-life in SSRPA model is also pointed out to change largely the half-lives by about one to two orders of magnitude with respect to the ones obtained without tensor force
From precision nuclear structure information to constraining statistical properties: Methodical developments in photonuclear reactions
Get PDFWe report on a new method to perform nuclear self-absorption measurements in combination with a monochromatic photon beam produced via laser Compton backscattering. We have used the method for two very different applications: The precision determination of the transition width of the first excited state in 12C to the ground state and to determine nuclear level densities up to the neutron separation energy in 88Sr. Both experiments serve as a proof of principle and are currently being analyzed. First preliminary results are presented
The LEGEND experiment for the search for the Majorana neutrino
Get PDFThe search for the neutrinoless double beta (0νββ) decay is con- sidered the most promising way to prove the Majorana nature of neutrinos. The LEGEND (Large Enriched Germanium Detector for Neutrinoless ββ Decay) col- laboration aims at building a 1 ton 76Ge-based 0νββ experiment with 3σ half-life discovery sensitivity of 1028 years to fully span the inverted neutrino mass ordering region. Combining the efforts of previous Gerda and MAJORANA experiments, the LEGEND project will first proceed by deploying 200 kg of enriched HPGe de- tectors in the already existing Gerda facility at Laboratori Nazionali del Gran Sasso (LNGS) in Italy. With an exposure of 1 t·yr and a background index of 0.5 counts/(FWHM·t·yr), LEGEND-200 will reach a 3σ half-life discovery sensitivity for the 0νββ decay of 1027 yr. An overview of the LEGEND project together with the current status and preliminary performance of LEGEND-200 are presented in this work
The first year of the IXPE mission: A view on extended sources
Get PDFLaunched in December 9, 2021 as a SMEX (Small Explorer) NASA mission, IXPE (Imaging X-ray Polarimetry Explorer) is the result of a NASA/ASI joint effort to build the first telescope with space-resolved spectro-polarimetric ca- pabilities in the soft X-ray band. In its first year of activity, IXPE successfully sampled tens of diverse sources, sometimes giving rise to quite unexpected results. In this contribution we briefly summarize the characteristics of the mission and its main results for selected extended sources that fully exploit IXPE’s potential
Progetto CELAVIE: descrizione metodologica per la produzione acquaponica di animali e piante
Get PDFScopo del presente report tecnico è la presentazione della tecnica di Acquaponica impiegata nell’ambito del progetto CELAVIE, programma di Cooperazione transfrontaliera Italia-Tunisia e ubicata presso il centro di sperimentazione della “cellula per la vita”. L’acquaponica è una tecnica agricola innovativa che porta benefici, sia agli agricoltori che all’ambiente. La gestione efficiente dell’acqua, la riciclabilità dei nutrienti e la maggiore produttività sono solo alcuni dei benefici che questa tecnica di coltivazione porta con sé (Manuale FAO, 2019). L'impianto realizzato a Palermo e a Sfax acquisisce dati utili allo studio dell’ambiente esterno, del terreno circostante e dell’ambiente interno alla cellula
Impact of dimension-six EFT operators on triboson processes at the LHC
Get PDFA parton-level analysis exploring potential manifestations of new physics phenomena beyond the Standard Model in triboson production processes is presented. In the context of Standard Model Effective Field Theories, the sensi- tivity to anomalous kinematic effects stemming from the presence of dimension-six operators is evaluated. The results provide valuable insights into the electroweak sector of the Standard Model and potential indications of new physics
Design and scientific objectives of the HERD cosmic ray experiment
Get PDFThe High Energy cosmic Radiation Detector (HERD) stands out as one of the most promising projects for space-based direct detection of cosmic rays. It is planned to be installed on the Chinese Space Station in 2027. The core of HERD is a 3D segmented, homogeneous, spherical calorimeter, featuring a total depth of 55X0. Three sub-detectors, namely the scintillating FIbres Tracker, Plastic Scintillation Detector, and Silicon Charge Detector, will enclose five out of six sides. Additionally, a Transition Radiation Detector will be installed on one face for online calibration of TeV energy events. HERD’s innovative design ensures a geometrical acceptance at least 10 times larger than that of any of its predecessors. This enhanced capability will enable the measurement of cosmic ray spectra and composition up to the PeV energy scale, to conduct precision studies in γ-ray astrophysics, to monitor transient events, and indirectly search for dark matter candidates with unprecedented accuracy
Development of the Barrel Sector Logic firmware of the ATLAS Muon Spectrometer for the High-Luminosity LHC
Get PDFThe Muon Spectrometer of the ATLAS detector at the Large Hadron Collider will undergo a substantial improvement during the Long Shutdown 3 to cope with the instantaneous luminosity and radiation levels foreseen for the High
Luminosity LHC. The entire trigger and readout electronics of the Resistive Plates Chambers will be replaced. All data coming from these detectors will be collected by the on-detector Data Collector and Transmitter boards and then sent to the off detector Sector Logic boards, which will execute the muon Level-0 trigger algorithm and perform the readout logic. This contribution describes the development of the
barrel Sector Logic firmware and the related challenges