Rutgers Nuclear Physics Group
Gamma Sphere Experiments

Transient Field measurements on super deformed 194Hg have been carried out in several experiments.
[g-fac-chamber] Open detector array with chamber used in g-factor experiments

In all experiments 193,194Hg was produced in the reaction 150Nd(48Ca,xn)Hg at about 204 MeV.

Data were written onto EXABYTE tapes. Pre processed event data were then written to DLT tapes using a new event structure  for the analysis.

GS 55

Gamma sphere had 90 detectors operational. The specific setup information is compiled in a header file, detid.h.. The detector configurations and placements are presented in lookup tables.
The efficiency data are parameters to be used with xclio.

The 'original' recorded events were reduced to essentially the following information:

The results of the analysis are published:
"First direct measurements of g factors of three superdeformed bands of 194Hg"
Phys. Rev. C58, R2640 (1998)

GS 120

This time 103 detectors of the 110 possible were implemented.
The setup is found in detid.h. The experiment design was for a target with a gap between the 150Nd layer and the Gd (ferromagnet), so that only nuclei while in the 3 lowest states of a SD band interact with the Gd.

The picture here shows the velocity of the nuclei taken from the Doppler shift of the SD1 band. In GS 120 (blue) all SD1 states decay while the nucleus is still in flight. The gap was too large. The red points are taken from experiment GS 55.


A summary can be found in the postmortem by Noemie Koller

Gerfried Kumbartzki
Last modified: Mon Sep 22 15:53:52 EDT 2003