Simultaneous NC , ES , CC Solar - neutrino Detection using Salt - filled Bladder with SNO

A Proposal for SNO is made for simultaneous detection of Neutral Current, Charged Current and Elastic Scattering of Solar-neutrino induced events. The detector would be a thin (order 0.001"), flexible, transparent bladder, of radius 5m to be placed within the main 6m radius acrylic sphere. It would be filled with heavy-water containing the usual 2.5T dissolved NaCI to act as the neutron-to-electron converter. Up to SOKg of HB03 would then be added to the region of heavywater between the main shell and the bladder in order to quench background neutrons from gamma induced fission of the deuterium from radioactivity in the main acrylic shell, PMTs and support structures and the lightwater. The light water region outside the main shell would be sensitive to ES signals, the heavywater region between the shell and the bladder to both ES and CC, and the region inside the bladder to ES, CC and NC. The detector could be inserted or removed at any time during the operation of SNO. In the unlikely event of rupture of the bladder SNO would still remain operational as only the NC signal would be quenched, but only for the length of time required to remove the HB03 and/or NaCI from solution.