NucleoSynthesis of Galactic 26 Al 26 Al gs +p, 26 Al m +p, 25 Al+p Resonances Peter Parker, Yale...
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Transcript of NucleoSynthesis of Galactic 26 Al 26 Al gs +p, 26 Al m +p, 25 Al+p Resonances Peter Parker, Yale...
NucleoSynthesis of Galactic 26Al
26Algs+p , 26Alm+p , 25Al+p Resonances
Peter Parker, Yale University
Catherine Deibel, Rachel Lewis, Anuj Parikh, Christopher Wrede,
Jac Caggiano, Jason Clark
2006 Mitchell Symposium
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.
HEAO-3 (1979) :
26Al (1809 keV) map of our GalaxyGRO-Comptel
R.Diehl et al., Nature 439(2006)45.
26Al 1809-keV -ray Line - SPI-INTEGRAL
R.Diehl et al., Nature 439(2006)45.
26Al 1809-keV -ray Line Doppler Shift vs. Galactic Longitude - SPI-INTEGRAL
25Al Branch Point:
(p,)26Si()26mAl()26MgGS
24Mg(p,)25Al ()25Mg(p,)26Al()26*Mg(26MgGS
25Al(p,)26Si Resonance Searches: 29Si(3He,6He)26Si 26Al(3He,t)26Si(p)25Al
Direct Measurement: TRIUMF DRAGON E922
Yale
TRIUMF E1O71
26gAl(p,)27Si Direct Measurement: TRIUMF DRAGON E989
26mAl(p,)27Al
Resonance Search: 27Al(3He,t)27Si(p)26mAl Yale
25Al(p,) Reaction Rates
29Si(3He,6He)27Si
J.A.Caggiano, et al.Phys.Rev.C65(2002)055801
25Al(p,)26Si Resonance Searches: 29Si(3He,6He)26Si 26Al(3He,t)26Si(p)25Al
Direct Measurement: TRIUMF DRAGON E922
Yale
TRIUMF E1O71
26gAl(p,)27Si Direct Measurement: TRIUMF DRAGON E989
26mAl(p,)27Al
Resonance Search: 27Al(3He,t)27Si(p)26mAl Yale
26Al Implanted Target: (TRIUMF-ISAC Proposal E1071)
HRMS 41010 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(-)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.
500-thick Silicon5 Sectors; 16 strips eachCovering 131°lab166°80-energy and 80-time signals
Yale LampShade Array - YLSA
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
5.566.577.58
FP excitation energy (MeV)
YL
SA
en
erg
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26Al
26Mg
26Al(3He,t)26Si*(p)25Al E YLSA vs. Focal Plane
25Al(p,)26Si Resonance Searches: 29Si(3He,6He)26Si 26Al(3He,t)26Si(p)25Al
Direct Measurement: TRIUMF DRAGON E922
Yale
TRIUMF E1O71
26gAl(p,)27Si Direct Measurement: TRIUMF DRAGON E989
26mAl(p,)27Al
Resonance Search: 27Al(3He,t)27Si(p)26mAl Yale
25Al(p,)26Si Resonance Searches: 29Si(3He,6He)26Si 26Al(3He,t)26Si(p)25Al
Direct Measurement: TRIUMF DRAGON E922
Yale
TRIUMF E1O71
26gAl(p,)27Si Direct Measurement: TRIUMF DRAGON E989
26mAl(p,)27Al
Resonance Search: 27Al(3He,t)27Si(p)26mAl Yale
Low-Energy 26Al(p,) Measurements :(Eres 600 keV)
• 1984 - Eres = 277, 363 keVBuchmann, Rolfs, et al.Nucl.Phys. A415 (1984) 93.
• 1989 - Eres = 188, 238, 277, 363 keVVogelaar, Kavanagh, et al.Ph.D. Thesis
• 1996 - 26Al(3He,d) (Eres = 188, 277 keV)Vogelaar, Champagne, et al.Phys.Rev.C 53 (1996) 1945.
`
26Al(p,)27Si
DRAGON TOF vs. Focal Plane Energy
E 989
E 989
26Al(p,)27Si DRAGON TOF Projection
ISAC-DRAGON Gas Target and BGO Array
E 989
Primary BGO Hit Position
(mm)
E 989
26Al(p,)TRIUMF - DRAGON E989
Chris Ruiz (Simon Fraser) PI
Anuj Parikh (Yale) - PhD Thesis
Ecm = 184±1 keV resonance.E(26Al) = 5.2 MeV2-4109 26Al/second
Hydrogen gas target: 6 torr, 12 cm
35 ± 7 eV
25Al(p,)26Si Resonance Searches: 29Si(3He,6He)26Si 26Al(3He,t)26Si(p)25Al
Direct Measurement: TRIUMF DRAGON E922
Yale
TRIUMF E1O71
26gAl(p,)27Si Direct Measurement: TRIUMF DRAGON E989
26mAl(p,)27Al
Resonance Search: 27Al(3He,t)27Si(p)26mAl Yale
27Al(3He,t)27Si*(p)26Al
27Al(3He,t)27Si*(p)26Al
27Al(3He,t)27Si*(p)26Al*
Rachel Lewis (Yale, 2005)
27Al(3He,t)27Si27Al(3He,t)27Si
Collaborations at TRIUMF
• E922 25Al(p,)26Si @ DRAGON
Alan Chen (McMaster) - P.I.
• E989 26gAl(p,)27Si @ DRAGON
Chris Ruiz (Simon Fraser) - P.I.
• E1071 26Al implanted target @ HRMS
Catherine Deibel (Yale) - P.I.
Yale – Nuclear Astrophysics Group
Faculty and Post Doc:
Peter Parker
Jason Clark
Current Graduate Students:
Anuj Parikh (5th year)
Catherine Deibel (4th year)
Christopher Wrede (3rd year)
Most Recent PhDs:
Rachel Lewis (‘05), PostDoc @ Univ.of York
Dale Visser (’03), Staff @ ORNL
Alan Chen (’00), Faculty @ McMaster
Dan Bardayan (’99DNP), Wigner Fellow @ ORNL
Recent PostDocs:
Will Bradfield-Smith @ Univ.Western Ontario
Jac Caggiano @ TRIUMF- DRAGON