May 20-28, 2016
This is the second experiment in the 2016 SPiRIT TPC campaign at RIKEN. A 132Sn beam will impinge on Sn targets, and the
resulting fragments from the heavy ion collisions will be detected in the SPiRIT TPC. The auxiliary KATANA and Kyoto scintillator arrays
will be used to select only the most central collision events. NeuLAND, an array of plastic scintillators, will be used to measure
the neutrons from the reaction. We plan to study observables that are predicted to display selective sensitivity to the symmetry
energy, like pion ratios, n/p ratios, and t/3He ratios. In this experiment we will measure relatively neutron rich systems
(132Sn + 124Sn, 132Sn + 112Sn), complementing the previous experiment in order to best probe the symmetry energy by providing
the largest possible differences in asymmetry.
April 28 - May 6, 2016
This is the first experiment in the 2016 SPiRIT TPC campaign at RIKEN. A 108Sn beam will impinge on Sn targets, and the
resulting fragments from the heavy ion collisions will be detected in the SPiRIT TPC. The auxiliary KATANA and Kyoto scintillator arrays
will be used to select only the most central collision events. NeuLAND, an array of plastic scintillators, will be used to measure
the neutrons from the reaction. We plan to study observables that are predicted to display selective sensitivity to the symmetry
energy, like pion ratios, n/p ratios, and t/3He ratios. In this experiment we will measure relatively neutron deficient systems
(108Sn + 124Sn, 108Sn + 112Sn), complementing the next experiment in order to best probe the symmetry energy by providing
the largest possible differences in asymmetry.
April 7-10, 2016
Commissioning run for the SPiRIT TPC using a 132Sn beam inside the magnetic field.
October 2015
Commissioning run for the SPiRIT TPC using a parasitic beam (79Se) without the magnetic field..
10-15 June 2013
The purpose of this experiment is to measure the isotopic distribution of
projectile residues from the collisions of Sn isotopes, which differ in their isospin asymmetry. Such measurements potentially offer a
uniquely direct comparison to transport theory because they suffer no ambiguities concerning
the particle production mechanism or the reaction timescale. For the first time, the experiment uses a rare
isotope beam, e.g. 108 Sn, to probe the symmetry energy. This allows us to increase the asymmetry difference between projectile and target and thereby increases the diffusion rate
between the two nuclei. It will also double the number of measurements of diffusion that have
been obtained so far and provide more stringent constraints on the density dependence of the
symmetry energy.
30 May-15 June 2011
The purpose of this experiment is to measure the isotopic distribution of projectile residues from the collisions of Sn isotopes,
which differ in their isospin asymmetry. Such measurements potentially offer a uniquely direct
comparison to transport theory because they suffer no ambiguities concerning the particle production
mechanism or the reaction timescale. These measurements were performed using the S800 spectrograph
in coincidence with a 4p charged particle detection array. This
provided impact parameter selection
and measurements of the diffusion rate from the yields of fragments with 3=Z=8 that can be compared
and cross calibrated with the residue fragment data.
