The LISA spectrometer David O’Donnell STFC Daresbury Laboratory.

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Presentation transcript:

The LISA spectrometer David O’Donnell STFC Daresbury Laboratory

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 JYFL November Ni (300 MeV) Cd -> 164 Os * LISA – JUROGAM II – RITU – GREAT Limited electronics set-up: two inner barrel detectors, two outer barrel detectors and one annular detector

Results of commissioning Simulation

Future of LISA Plan to repeat 58 Ni Cd commissioning measurement with full array –study 159 Re (p4n) Other intertesting cases include 169 Au

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 ( 66 Se) Any other ideas?

LISA collaboration STFC 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