status of tactic: a detector for nuclear astrophysics alison laird university of york
Post on 15-Jan-2016
215 views
TRANSCRIPT
![Page 1: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/1.jpg)
Status of TACTIC:A detector for nuclear astrophysics
Alison Laird
University of York
![Page 2: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/2.jpg)
Experimental Nuclear Astrophysics at low energies
Studying directly key nuclear reactions for nucleosynthesis and energy generation in explosive sites – novae, supernovae and X-ray bursters
Experimental conditions Beam energies: about 0.1 – 2 MeV/u ( up to few 109 K ) Charged particle energies of few MeV down to ~ 100 keV Radioactive beams – high background, low intensity Cross sections can be low - < mbarn
Need high efficiency, large solid angle detector arrays with low detection threshold
![Page 3: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/3.jpg)
TRIUMF Annular Chamber for Tracking and Identification of Charged particles
MOTIVATION: study the 8Li(,n)11B reaction
Recent (rapid neutron capture) r-process network calculations of core collapse supernovae have included light nuclei and shown that for particular models, two nuclear reaction chains
nBe(n,)10Be()14C and(t,)7Li(n,)8Li(,n)11B
can significantly affect the final abundances of certain heavy nuclei
Much experimental effort has gone into studying this reaction……….
![Page 4: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/4.jpg)
![Page 5: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/5.jpg)
![Page 6: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/6.jpg)
![Page 7: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/7.jpg)
![Page 8: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/8.jpg)
Schematic design of TACTIC detector
![Page 9: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/9.jpg)
![Page 10: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/10.jpg)
![Page 11: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/11.jpg)
![Page 12: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/12.jpg)
![Page 13: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/13.jpg)
![Page 14: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/14.jpg)
![Page 15: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/15.jpg)
GEANT 4 Simulations
• Currently developing GEANT 4 simulations of prototype cylindrical chamber– stopping powers of low energy charged particles not well reproduced
Ver
tica
l Dis
tanc
e fr
om b
eam
axi
s [m
m]
Distance along beam axis from start of target region [mm]
11B end points, 9 MeV 8Li beam, 250 mbar 90/10 He/CO2
![Page 16: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/16.jpg)
FEMLAB Simulations
![Page 17: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/17.jpg)
Drift time of electrons released at –500V cathode to the GEM, with and without voltage shaping rings, at the end caps, of radius 10mm.
![Page 18: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/18.jpg)
Summary - TACTIC
• Detection of low energy charged particles for direct measurements of astrophysically interesting reactions with large solid angle coverage
• Measure dE/dx, E and timing to reconstruct track and identify particle
• Target and detector gas can be same or separate as determined by experimental constraints
• Surrounded by gamma array (BGO?) Design versatile enough to optimise
configuration for other studies: 12C+12C low energy fusion 18Ne(,p)21Na ……..
Design complete by end 2005
Fabrication and assembly – early 2006
Initial testing in York using alphas – spring 2006
Testing in beam at TRIUMF in summer 2006
![Page 19: Status of TACTIC: A detector for nuclear astrophysics Alison Laird University of York](https://reader035.vdocuments.mx/reader035/viewer/2022062804/56649d545503460f94a30882/html5/thumbnails/19.jpg)
Many thanks to G. Ruprecht for most of these slides!
S.P. Fox, B. R. Fulton, A.M. Laird, P. Mumby-CroftUniversity of York
P. Amaudruz, L. Buchmann, T. Kirchner, M. Pavan, J. Pearson, G. Ruprecht, P. Walden
TRIUMF