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



Yale

TRIUMF E1O71


26mAl(p,)27Al


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

y

26Al

26Mg

26Al(3He,t)26Si*(p)25Al E YLSA vs. Focal Plane



Yale

TRIUMF E1O71


26mAl(p,)27Al


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



Yale

TRIUMF E1O71


26mAl(p,)27Al


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

NucleoSynthesis of Galactic 26 Al 26 Al gs +p, 26 Al m +p, 25 Al+p Resonances Peter Parker, Yale...

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