Toward a test of angular-momentum coherence in a twin-atom interferometer Carlos R. de Carvalho, Ginette Jalbert, François Impens, J. Robert, Aline Medina, F. Zappa and N. V. de Castro Faria EPL, 110 5 (2015) 50001 Published online: 19 June 2015 DOI: 10.1209/0295-5075/110/50001