Information for HRIBF PAC-11 Proposals

mass difference calculator	Estimate isobar contamination
TOPS	Estimate tandem voltage and beam charge state(s)
Neutron-rich beam yields	Estimate yields based on TOPS results

We encourage you to contact us with suggestions for the beams you require to pursue your physics research. Parameters as to what constitutes a suitable beam for the HRIBF may be found in our more recent newsletters.

We ask that you need to be aware that scheduling experiments at our facility is difficult. Sufficiently many experiments must be available before it is "cost effective" to schedule a particular RIB ion source or endstation configuration.

Additional information reflecting the present status of equipment and techniques is provided below in information from previous PACs or may be found from our recent newsletters. Older articles on major experimental endstations and neutron-rich experiments may also be useful.

Light-ion RIBs through May 1, 2005

The second stage isobaric separator, a critical magnet on the RIB injector beamline, developed a serious water leak which damaged one of the three pancakes which make up a coil of the downstream dipole. Subsequent attempts to apply a current well within specifications to the remaining pancakes resulted in damage to two additional pancakes. With the remaining pancakes, we are able to run A<33 masses through the RIB injector. New coils have been ordered and delivery is expected in April.

Thus, our RIB schedule through April will consist of ⁷Be, ¹⁷F, ¹⁸F, and if available, radioactive Al beams. For more information contact the User Liaison at liaison@phy.ornl.gov.

Recoil mass spectrometer and online test facility

No beams will be delivered to the RMS and OLTF during the period through February 1, 2005. The new construction for the High Power Target Laboratory will prevent the delivery of beams to these endstations. After February 1 we will be restricted to stable beams and light RIBs (see above).

For more information contact Carl Gross at cgross@phy.ornl.gov.

Decay spectroscopy of weak "contaminants" in neutron-rich beams

A new method for the study of the decay properties (halflives, beta-gamma spectroscopy, etc.) has been developed for neutron-rich beams. The beam is accelerated to ~3 MeV/u and directed into a gas-filled ionization chamber which is operated at pressures so that the heavier Z-components of the beam are stopped in the gas or exit window of the chamber. Initial tests of A=120 RIBs saw a factor of 5 enhancement of Ag decay lines over In decay lines (dZ=2).

For more information contact Carl Gross at cgross@phy.ornl.gov.