Absolutely--I'd even recommend it. Over a season, your congregation might even start to join in. My schola will be singing it during this season. A priest I met just last week told me that it was an old Roman custom to sing the seasonal Marian antiphon after Mass.
You're very free to choose music (or not) for a recessional--there is no music at all prescribed for the recessional of Mass.
And as I've mentioned elsewhere, there is at least one local use of the Roman Rite, which is the Rite of Braga (in Portugal), in which the Marian antiphon is sung not only at the end of the Office but also at the end of Mass (though the Marian Antiphons in Braga do not match those normally found in the Roman Rite).
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