SASSYER
SASSYER (Small Angle Separator
System at Yale for Evaporation Residues) is a gas-filled separator
that is used to selectively separate recoils following target
bombardment. Recoil separators have been used to study nuclei with
production yields less than 0.001% of the total reaction
cross-section. The implementation of SASSYER at the WNSL allows studies of
heavy exotic nuclei far from stability.
Pictures of the
Delivery
On 15 May 2000 SASSY arrived from
Berkeley Lab (LBL) via truck. Here
are the pictures of the unloading ceremony and subsequent
installation into the staging area of WNSL where SASSY has been
refurbished and renamed SASSYER.
SASSYER arrival pictures
SASSYER consists of two
vertically-focussing magnetic dipoles on either side of a quadrupole.
He gas at about 1 Torr pressure is used within the chamber to equilibrate the
recoil charge states. Recoils leave the target with a distribution of
charge states; use of the gas combines recoils into the average
charge state that will fit into the separator acceptance. Gas-filled
recoil separators are notable for their high collection efficiency.
Other examples include the Berkeley Gas-filled Separator at
LBL and RITU at
Jyväskylä.
Many of the detectors from YRAST
Ball have been placed around the target area. The frame holds up to
13 clover detectors, yielding an efficiency of about 3% for 1 MeV gamma
rays.
A solar cell array (similar to
SCARY) is located at the back of M2. In the future, we will use a
Double Sided Silicon Strip Detector (DSSSD).
Shown below are the SASSYER
magnets. The beam dump has been removed from the side of M1. The
second image shows the frame for the HPGe detectors that
surround the target position.
We are just starting the physics program using
SASSYER
To see some of our work, click on one of the links below.
Introduction to separators and SASSYER
Experiments using separators
Nuclear Structure of Z>82, N<126 nuclei
More SASSYER photos (with people, too!)
Powerpoint slides of talks involving SASSYER
These first three have the same title,
"SASSYER: An old instrument for new physics at
Yale".
The EMIS and ICNS conference contributions are similar to one another.
EMIS, May 2002 (JJ Ressler)
ICNS (aka "Rick-fest", May 2002 (JJ
Ressler)
Yale seminar, July 2002 (JJ Ressler)
Physics with SASSYER:
Probing Nuclei Above Z=82 (Rutgers seminar, Jan 2003, JJ Ressler)
Nuclear Isomerism:
Probes of Nuclear Structure and Tools of the Future (JJ Ressler)
[Nuclear
Structure] [WNSL]
[Physics Department]
[Yale University]
Last modified March 2003.
Send comments/questions to
J. J. Ressler.