One-to-many associations are declared at the property level with the annotation @OneToMany.
A unidirectional one to many using a foreign key column (using @JoinColumn) in the owned entity is not that common and not really recommended. You are strongly advised to use a join table for this kind of association.
Unidirectional with join table
A unidirectional one to many with join table is much preferred. This association is described through @JoinTable.