  A new reconstruction of the heliospheric modulation potential for galactic
cosmic rays is presented for the neutron monitor era, since 1951. The new
reconstruction is based on an updated methodology in comparison to previous
reconstructions: (1) the use of the new-generation neutron monitor yield
function, (2) the use of the new model of the local interstellar spectrum,
employing in particular direct data from the distant missions, and (3) the
calibration of the neutron monitor responses to direct measurements of the
cosmic ray spectrum performed by the PAMELA space-borne spectrometer over 47
time intervals during 2006{2010. The reconstruction is based on data from six
standard NM64-type neutron monitors (Apatity, Inuvik, Kergulen, Moscow, Newark
and Oulu) since 1965, and two IGY-type ground-based detectors (Climax and
Mt.Washington) for 1951-1964. The new reconstruction, along with the estimated
uncertainties is tabulated in the paper. The presented series forms a benchmark
record of the cosmic ray variability (in the energy range between 1-30 GeV) for
the last 60 years, and can be used in long-term studies in the fields of solar,
heliospheric and solar-terrestrial physics.
