Digital Data Acquisition System for experiments with segmented detectors at National Superconducting Cyclotron Laboratory

Structure of16C: Testing shell model andab initioapproaches

“…Excited states in 16 C were populated via the 9 Be( 17 N, 16 C+γ)X one-proton knockout reaction. The plunger was surrounded by the γ-ray spectrometer SeGA [18], which consisted of fifteen 32-fold segmented high-purity germanium detectors and was coupled to the new digital data acquisition system DDAS [19]. SeGA was configured in two rings with seven detectors at 30…”

Lifetime Measurement of the21+State inC20

“…) for 14,16,18 C in the range of 3-4 e 2 fm 4 . The B(E2) value for 20 C obtained in this work shows this trend continuing and even to increase further.…”

“…A 22 O secondary beam was produced by fragmenting a 140 MeV/nucleon primary 48 Ca beam on a 775 mg/cm 2 9 Be production target. The A1900 separator [13] was used to select and transport the 22 O ions to the S800 beamline where they underwent reactions on a second 500 mg/cm 2 9 Be target located at the target position of the S800 spectrograph [14], producing 20 [15], an array of fifteen 32-fold segmented highpurity germanium detectors, surrounding the S800 target position and coupled to the new digital data acquisition system (DDAS) [16]. The detector segmentation defines the γ-ray emission angle and is used for event-by-event Doppler correction to the energy of the γ ray emitted from the fast moving nuclei (v/c ∼ 40%).…”

Shape coexistence alongN=40

“…All detector data were read out using the NSCL Digital Data Acquisition System (DDAS) whose hardware is described in Ref. [21]. Individual channels were independently triggered, time stamped, written to disk, and those channels triggering within a 10 µs time window were grouped into events in software.…”