title: Measuring the Newtonian constant of gravitation G with an atomic interferometer.
abstract: We have recently completed a measurement of the Newtonian constant of gravitation G using atomic interferometry. Our result is G=6.67191(77)(62)×10(-11) m(3) kg(-1) s(-2) where the numbers in parenthesis are the type A and type B standard uncertainties, respectively. An evaluation of the measurement uncertainty is presented and the perspectives for improvement are discussed. Our result is approaching the precision of experiments based on macroscopic sensing masses showing that the next generation of atomic gradiometers could reach a total relative uncertainty in the 10 parts per million range.
authors.affiliation: Dipartimento di Fisica e Astronomia, Università di Bologna - INFN Sezione di Bologna, Viale Berti-Pichat 6/2, 40127 Bologna, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Prevedelli
authors.affiliation: European Space Agency, Keplerlaan 1, PO Box 299, 2200 AG Noordwijk ZH, The Netherlands.
authors.forename: L
authors.initials: L
authors.lastname: Cacciapuoti
authors.affiliation: Dipartimento di Fisica e Astronomia and LENS, Università di Firenze - INFN Sezione di Firenze, Via Sansone 1, 50019 Sesto Fiorentino, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Rosi
authors.affiliation: Dipartimento di Fisica e Astronomia and LENS, Università di Firenze - INFN Sezione di Firenze, Via Sansone 1, 50019 Sesto Fiorentino, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Sorrentino
authors.affiliation: Dipartimento di Fisica e Astronomia and LENS, Università di Firenze - INFN Sezione di Firenze, Via Sansone 1, 50019 Sesto Fiorentino, Italy guglielmo.tino@fi.infn.it.
authors.forename: G M
authors.initials: GM
authors.lastname: Tino
keywords: atomic gradiometer; cold atoms; gravitational constant