arXiv subjects

Piera Sapienza

Publications and source records attributed to Piera Sapienza.

3 recordsLinked to original sources

arXiv2007

Prompt dipole radiation in fusion reactions

The prompt gamma ray emission was investigated in the 16A MeV energy region by means of the 36,40Ar+96,92Zr fusion reactions leading to a compound nucleus in the vicinity of 132Ce. We show that the prompt radiation, which appears to be still effective at such a high beam energy, has an angular distribution pattern consistent with a dipole oscillation along the symmetry axis of the dinuclear system. The data are compared with calculations based on a collective bremsstrahlung analysis of the reaction dynamics.

nucl-ex↗

arXiv2006

Status of the NEMO Project

The NEMO project aims at the search, development and validation of key technologies for the construction, deployment and mantainance of an underwater Cherenkov km3 neutrino telescope in the Mediterranean Sea. Moreover, the NEMO Collaboration carried out a long term exploration of a 3500 m deep sea site close to the Sicilian coast; the study has shown that it is optimal for the installation of the detector. A Phase-1 project, which is under way, will validate the proposed technologies for the km3 detector on a Test Site at 2000 m depth. The realization of a new infrastructure on the candidate site (Phase-2 project) will provide the possibility to test detector components at 3500 m depth and will allow also a continuous monitoring of the site.

astro-ph↗

arXiv2001

Measurements of light transmission in deep sea with the AC9 trasmissometer

The NEMO Collaboration aims to construct an underwater Cerenkov detector in the Mediterranean Sea, able to act as a neutrino telescope. One of the main tasks of this project, which implies difficult technological challenges, is the selection of an adequate marine site. In this framework the knowledge of light transmission properties in deep seawater is extremely important. The collaboration has measured optical properties in several marine sites near the Italian coasts, at depths >3000 m, using a set-up based on a AC9, a commercial trasmissometer, manufactured by WETLabs. The results obtained for the two sites reported in this paper Alicudi and Ustica, show that deep seawater optical properties are comparable to those of the clearest waters.

astro-ph↗