SASSYER

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SASSYER

• An old instrument for new physics at Yale

ICNS 02, Jackson Hole, WY
Jennifer Jo Ressler
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SASSYER History
1988 Berkeley National Laboratory A. Ghiorso
SASSY1 gt SASSY2 209Bi(59Co,n)267110 Evid
ence for the possible synthesis of element 110
A. Ghiorso et al., PRC 51 (1995) R2293.
2001 Wright Nuclear Structure Laboratory SASSYER
M1 DV (2.36 in) Q QH M2 DV (5.51 in)
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gas 1 torr He in 2.4 m ?Erecoil in gas Qave
for recoil
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SASSYER

• Commissioning with alpha and fission sources, low
  intensity beams
• Quartz phosphor
• Solar cells
• 32S 122Sn, 46Ti 122Sn

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Solar Cells

• small (1 cm2)
• rugged
• low cost
• reasonable resolution

228Th a source
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Parameters
SASSYER
- DvQhDv - 5 msr - Brmax 2.2 Tm - 2.4 m - 1
torr He gas - 50 mg/cm2 C window
BGS - QvDhD - 45 msr - Brmax 2.5 Tm - 4.7 m -
1 torr He gas V. Ninov et al., ENAM 98, 704 (98).
HECK - DQhQv - 10 msr - Brmax 2.2 Tm - 3.8 m -
0.075 0.75 torr He V, Ninov et al., NIM A 357,
486 (95).
Dubna GFRS - DQhQv - 10 msr - Brmax 3.1 Tm -
4.3 m - 1 torr H2 gas Yu. A. Lazarev et
al., Report E7-93-274, JINR Dubna, 1993, vol. II
p. 497
RITU - QvDQhQv - 10 msr - Brmax 2.2 Tm - 4.7
m - 0.76 torr He gas M. Leino et al., NIM B 99,
653 (99).
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Y (Y-prime)

• Detectors from YRAST-Ball
• 13 clover detectors maximum
• 9 at 90o
• 4 at 138.5o
• 2-4 LEPS
• .e 2.5

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46Ti 122Sn
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32S 122Sn
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First Physics
32S 176Yb 165 MeV gt 202,203Rn

• has been studied at the WNSL
• structure is known
• high fission cross-section
• (PACE 312 mb fission
• 0.96 mb 203Rn
• 0.32 mb 202Rn)
• high rigidity (Br 1.9 Tm)

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Previous Studies
Our data is preliminary!!
203Rn H. Newman et al., PRC 64, 027304
(01). 202Rn R. B. E. Taylor et al., PRC 54,
2926 (96). S. J. Freeman et al., PRC 50, R1754
(94).
203Rn
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202Rn
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Delayed g-detector
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Auxillary Detectors

• At the target position
• NYPD lifetime measurements
• ICEY-Ball electron detectors
• At the exit of SASSYER
• MACY Multiwire Avalanche Counter at Yale
• DSSSD Double Sided Silicon Strip Detector
• Ge array for isomer studies
• MTC? GREAT?

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Future Experiments

• Recoil Decay Tagging (RDT)
• Isomer Decay Tagging (IDT)
• Heavy Element Studies

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Collaboration
Yale R. Krücken C. W. Beausang R. F.
Casten V. Zamfir H. Amro M. A. Caprio A. A.
Hecht D. Meyer Z. Harris M. Sciacciatano
T. Barker, D. Wagner J. Ashtenfelter, B.
McGrath, W. Garnet, S. Ezeocoli
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Collaboration
J. M. DAuria, Simon Fraser P.
Regan, Surrey S. Langdown, Surrey A. Yamamoto,
Surrey G. Gürdal, Istanbul C. Hutter,
Darmstadt C. Barton K. Zromski
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Equations
C foil
gas 1 torr He in 2.4 m ?Erecoil in gas Qave
for recoil
Thomas-Fermi
Oganessian et al. (ZPD 21 (91) S357.)
Ghiorso et al. (NIM A 269 (88) 192.)