Cryogenic tank and space launcher including such a tank

A cryogenic tank for a space launcher intended to contain a propellant wherein the cryogenic tank comprises a jacket delimiting a storage volume for cryogenic liquid and at least one partition situated in the storage volume, said partition delimiting top and bottom volumes for the fluid in the tank, said top and bottom volumes communicating via at least one central opening formed in the partition, the partition extending from a wall of the tank to a center of the storage volume with an incline toward a bottom end of the tank to the at least one central opening, so as to allow for a flow of liquid by gravity from the top volume to the bottom volume via the at least one central opening and to prevent or limit the rising of the fluid from the bottom volume to the top volume via the at least one central opening under the action of acceleration forces, the tank further comprising at least one vent forming at least one passage in the partition separate from the at least one central opening and providing fluid communication between the top and bottom volumes, characterized in that the at least one central opening is free and in that the passage of the vent is configured to favor migration of vapor from the bottom volume to the top volume and to prevent or limit the rising of liquid from the bottom volume to the top volume.