Laboratory Measurements of Explosive Nucleosynthesis

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Laboratory Measurements of Explosive
Nucleosynthesis
Peter Parker
Jac Caggiano, Jason Clark
Catherine Deibel, Rachel Lewis, Anuj Parikh,
Christopher Wrede
Yale University
B2FH 50 July 2007
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HEAO-3 (1979)
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26Al (1809 keV) map of our Galaxy GRO-Compt
el
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26Al 1809-keV g-ray Line Doppler Shift vs.
Galactic Longitude - SPI-INTEGRAL
R.Diehl et al., Nature 439(2006)45.
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Explosive NucleoSynthesis
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Wasserburg, et al. e.g., T.Lee
D.Papanastassiou, Geophys.Res.Lett. 1(1974) 225.
J,G,Bradley et al., J.Geophys.Res.
83(1978)547.
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PreSolar SiC grain
PreSolar Graphite grain
L. Nittler, EPS Letts. 209(2003) 259.
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d 30Si/28Si (30/28 - 30/28solar) /
30/28solar
( J. José et al. Ap.J. 612(2004) 414.)
Amari et al. Ap.J. 551(2001)1065. in
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31S
(p,g)
30P
(b n)
2.5 min
30Si
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e.g., Chris Wrede
30P(p,g) resonances via 30P(p,g)31S _at_
TRIUMF (E-1108) via 31P(3He,t)31S(p)30P
_at_ Yale
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31P(3He,t)31S(p)30P
30P p Resonances
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• Yale LampShade Array - YLSA

500-m thick Silicon 5 Sectors 16 strips
each Covering 131?qlab?166 80-energy and
80-time signals
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31P(3He,t)31S
7035 keV
6160 keV
6394 keV
7196 keV
7744 keV
7501 keV
6327 keV
6749 keV
Qo 6133 keV
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31P(3He,t)31S(p)30P
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31P(3He,t)31S(po)30Pgs
7035 keV (902 keV)
7744 keV (1611 keV)
7196 keV (1063 keV)
7501 keV (1368 keV)
6749 keV (616 keV)
6394 keV (261 keV)
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100
26
?
5/2
( l 2) p
p ( l 2)
26mAl
26Alg
7.691 MeV
7.463 MeV
27Si
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26mAl(p,g) resonances
e.g., Catherine Deibel
Indirect Measurements
27Al(3He,t)27Si(p)26mAl _at_ Yale 28Si(3He,a)27Si
(p)26mAl _at_ Yale
e.g., Chris Ruiz
Direct Measurements
p(26mAl,g)27Si _at_ TRIUMF (E989)
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27Al(3He,t)27Si(p)26mAl
26mAl p Resonances
28Si(3He,a)27Si(p)26mAl
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Focal Plane Position 28Si(3He,a)27Si
8451 keV
8871 keV
8036 keV
9335 keV
channel number
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28Si(3He,a)27Si(p)26Al
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( 760 keV)
Focal Plane Position 28Si(3He,a)27Si(p)26mAl
( 637 keV )
(1180 keV)
8451 keV
8328 keV
(1348 keV)
8871 keV
8597 keV ( 906 keV)
9039 keV
channel number
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Focal Plane Position 28Si(3He,a)27Si(p)26Algs
9335 keV
8358 keV
8514 keV
channel number
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Comparison of 27Si proton decays
to 26mAl and 26Algs
8451 kV
8328 keV
8871 keV
9335 keV
9039 keV
8514 keV
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• Yale Nuclear Astrophysics Group

Faculty and Post Doc Peter Parker
Jason Clark Current Graduate Students
Christopher Wrede (4th year) Catherine
Deibel (5th year) Most Recent PhDs Anuj
Parikh (06), PostDoc _at_ Univ. Politecnica
Catalunya, Barcelona Rachel Lewis (05),
PostDoc _at_ Univ.of York Dale Visser (03),
Microsoft, Seattle Alan Chen (00), Faculty
_at_ McMaster Dan Bardayan (99DNP), Wigner
Fellow _at_ ORNL Recent PostDocs Jac Caggiano
_at_ Hanford Lab, Richland, WA Will
Bradfield-Smith _at_ Univ.Western Ontario
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25Al Branch Point
(p,g)
7.2 s
(p, g)26Si(bn)26mAl(bn)26MgGS 24Mg(p
,g)25Al (bn)25Mg(p,g)26Al(bn)26Mg(g)
26MgGS
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• 25Al(p,g)26Si ?
• Resonance Searches 29Si(3He,6He)26Si (Caggian
  o)
• 24Mg(3He,n)26Si (Parpottas)
• 28Si(p,t)26Si (Bardayan)
• 26Al(3He,t)26Si(p)25Al (Yale)
• TRIUMF E1071 (C. Deibel)

Direct Measurement
TRIUMF DRAGON E922 (A. Chen)
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26Al Implanted Target (TRIUMF-ISAC
Proposal E1071)

• HRMS ? ? 4?1010 26Al/sec at an energy of
  51 keV
• ? 1017 26Al/cm2 rastered into a 3-mm
  diameter circle
• in 4 to 7 days,
  into a 40 µg/cm2 carbon foil
• Contamination About 1 to 10
  26Na(b-n)26Mg,
• But ? no
  27Al

With this target, in conjunction with the
Yale split-pole spectrograph and the
YLSA silicon array, we project a
26Al(3He,t)26Si(p)25Al coincidence rate of
1/hour.
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6399 keV
6394 keV
6377 keV
6357 keV
6327 keV
6281 keV
6260 keV
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27Al(3He,t)27Si(p)26Al
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Focal Plane Position 27Al(3He,t)27Si
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27Al(3He,t)27Si(p)26Al
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Focal Plane Position 27Al(3He,t)27Si(p)26
Algs
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Focal Plane Position 27Al(3He,t)27Si(p)26
mAl
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Comparison of 27Si proton decays
to 26mAl and 26Algs
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Comparison of 27Si proton decays
to 26mAl and 26Algs