The LISA spectrometer David O’Donnell STFC Daresbury Laboratory.
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What is LISA?
Light Ion Spectrometer Array
Array of silicon detectors
Design based on TIARA
-Si array for transfer reactions at GANIL
Designed to detect charged particles at the target position of the
Jyvaskyla JUROGAM-RITU-GREAT apparatus
Why use LISA?
...but it has its limitations
Decay by proton emission – too fast for standard RDT
Use LISA to detect fast proton decays
ToF > 0.5 s
Recoil-decay tagging has proven to be extremely successful...
Why use LISA?
...but it has its limitations
Decay by proton emission – too fast for standard RDT
Use LISA to detect fast proton decays
ToF > 0.5 s
Recoil-decay tagging has proven to be extremely successful...
Why use LISA?
...but it has its limitations
Decay by proton emission – too fast for standard RDT
Use LISA to detect fast proton decays
ToF > 0.5 s
Recoil-decay tagging has proven to be extremely successful...
Why use LISA?
...but it has its limitations
Decay by proton emission – too fast for standard RDT
Use LISA to detect fast proton decays
ToF > 0.5 s
Recoil-decay tagging has proven to be extremely successful...
Why use LISA?
...but it has its limitations
Decay by proton emission – too fast for standard RDT
Use LISA to detect fast proton decays
ToF > 0.5 s
Recoil-decay tagging has proven to be extremely successful...
p
Why use LISA?
...but it has its limitations
Decay by proton emission – too fast for standard RDT
Use LISA to detect fast proton decays
Recoil-decay tagging has proven to be extremely successful...
Why use LISA?
Detection of prompt charged particles emitted from deformed high-lying states
Rudolph et al., PRL 80 (1998) 3018
Also as a veto to select weak xn evaporation channels following fusion-evaporation reactions
LISA: a few details
Novel target changing mechanism: two rotating
targets, an alpha source and quartz glower
Two octagonal Si barrels and two Si annular detectors:
≈ 80% of 4
Molybdenum foils to shield from scattered heavy-ions
LISA: a few details
Novel target changing mechanism: two rotating
targets, an alpha source and quartz glower
Two octagonal Si barrels and two Si annular detectors:
≈ 80% of 4
Molybdenum foils to shield from scattered heavy-ions
LISA: a few details
Novel target changing mechanism: two rotating
targets, an alpha source and quartz glower
Two octagonal Si barrels and two Si annular detectors:
≈ 80% of 4
Molybdenum foils to shield from scattered heavy-ions
LISA: a few details
Novel target changing mechanism: two rotating
targets, an source and quartz glower
Two octagonal Si barrels and two Si annular detectors:
≈ 80% of 4
Molybdenum foils to shield from scattered heavy-ions
Commissioning experiment @ JYFL
November 2009
58Ni (300 MeV) + 106Cd -> 164Os *
LISA – JUROGAM II – RITU – GREAT
Limited electronics set-up: two inner barrel detectors, two outer barrel detectors and one
annular detector
Future of LISA• Plan to repeat 58Ni + 106Cd
commissioning measurement with full array– study 159Re (p4n)
• Other intertesting cases include 169Au
Future of LISA• Identify candidates for prompt
proton emission outside of Z~28, N~28– Possibly neutron-deficient Te isotopes?
• Use in “double--tagging” (D.G. Jenkins et al. proposal to JYFL)– Si detectors replaced with plastic
scintillator to provide larger coverage– Study astrophysically important nuclei
beyond N=Z line (66Se)
• Any other ideas?
LISA collaborationSTFC Daresbury: R. Griffiths, M. Labiche, P. Morrall, D. O’Donnell, J. Simpson and J. Strachan.
University of Liverpool: R.J. Carroll, D.T. Joss, R.D. Page, J. Thornhill and D. Wells.
University of Jyväskylä: T. Grahn, P.T. Greenlees, K. Hauschild, A. Herzan, U. Jakobsson, P.M. Jones, R. Julin, S. Juutinen,S. Ketelhut, M. Leino, A. Lopez-Martens, P. Nieminen, P. Peura, P. Rahkila, S. Rinta-Antila, P. Ruotsalainen, M. Sandzelius, J. Sarén, C. Scholey, J. Sorri and J. Uusitalo.
University of the West of Scotland: J.F. Smith
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