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Aarhus-Bordeaux-Madrid-CERN-Göteborg-Jyväskylä-GANIL Collaboration
Two-proton emission
Observables : (Partial) lifetime, and energy and angular correlations
- Rep. Prog. Phys. 71 (2008) 46301
Not yet observed
Studies of -delayed two-proton emission : The cases of 31 Ar and 35 - - PowerPoint PPT Presentation
Studies of -delayed two-proton emission : The cases of 31 Ar and 35 - - PowerPoint PPT Presentation
Studies of -delayed two-proton emission : The cases of 31 Ar and 35 Ca Aarhus-Bordeaux-Madrid-CERN-Gteborg-Jyvskyl-GANIL Collaboration Two-proton emission Rep. Prog. Phys. 71 (2008) 46301 Not yet observed Observables : (Partial)
SLIDE 2
SLIDE 3
Bordeaux Warsaw
Two-proton emission
45Fe → 43Cr + 2p
SLIDE 4
Bordeaux Warsaw
Two-proton emission
45Fe → 43Cr + 2p
SLIDE 5
Bordeaux Warsaw
Two-proton emission
45Fe → 43Cr + 2p
SLIDE 6
Beta-delayed two-proton emission
22Al, 23Si, 26P, 27S, 31Ar, 35Ca, 39Ti, 43Cr, 45Fe and 50Ni
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Region of interest
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31Ar-decay
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31Ar-decay
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Many states Many states
31Ar-decay
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Many states Many states
31Ar - a new look
Study 30S levels Search for direct 2p-decay
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31Ar-decay :
Search for direct 2p-decay
- Clean place to search for
direct 2p-decay
- Estimated ~10-2-3 suppressed
compared to sequential decay
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Astrophysical interest :
29P(p,γ)30S reaction
31Ar-decay : 30S-spectroscopy
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29P(p,γ)30S reaction
31Ar-decay : 30S-spectroscopy
- β-decay data competitive!
- low energy region unclear
- Search for 4704keV level
- Search for other new levels
- measure Γp/Γγ for levels
PRC 76 (2007) 045803, MSU
SLIDE 15
35Ca-decay
Äystö 1985 Trinder 1997
- β-delayed two-proton emission
- Spectroscopic information from 34Ar
- Fermi and Gamow-Teller strength
Motivation
SLIDE 16
Production
31Ar
- CaO target, cold-plasma
- Yield ~ 3 atoms/s.
35Ca
- Ti foil target (new design)
- Yield ~ 1 atoms/s (estimate)
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Setup
Efficiencies:
Charged particles 1p : 60-75% (25%) 2p : 35% (5%) Gammas Orders of magnitude more than last Surrounded by 3 four-leaf Ge clover detectors
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1997 experiment Simulated response
- f planned setup
SLIDE 19
Beam request
β-decay of 31Ar :
27 shifts: Measurement and calibration
- factor 5-15 more 2p events than
previous measurement for 1-3 31Ar/s.
β-decay of 35Ca :
6 shifts: Target test