NucleoSynthesis of Galactic 26Al

25Al+p Resonances

Peter Parker, Yale University

Catherine Deibel, Rachel Lewis, Anuj Parikh, Christopher Wrede

Jac Caggiano, Jason Clark

ORNL - 23 Oct.’06

26Al (1809 keV) map of our GalaxyGRO-Comptel

24Mg25Mg

Mg*26

25Al26 g.s.Al

26S i

26 mAl

Mg26 g.s.

1.80

9-MeV

ra

y

(p,)26Si()26mAl()26MgGS

24Mg(p,)25Al ()25Mg(p,)26Al()26*Mg(26MgGS

25Al Branch Point:

25Al(p,)26Si Resonance Searches: 29Si(3He,6He)26Si (Caggiano)

24Mg(3He,n)26Si (Parpottas)

28Si(p,t)26Si (Bardayan)

[ 26Al(3He,t)26Si(p)25Al ] (Yale)

TRIUMF E1071 (C. Deibel)

TRIUMF DRAGON E922 (A. Chen)Direct Measurement:

29Si(3He,6He)27Si (Yale): Caggiano, et al. Phys.Rev.C 65,055801(2002)

24Mg(3He,n)26Si (Ohio Univ.): Parpottas, et al. Phys.Rev.C 70,065805(2004).

28Si(p,t)26Si (ORNL): Bardayan, et al. Phys.Rev.C 74,045804(2006).

28Si(p,t)26Si (ORNL): Bardayan, et al. Phys.Rev.C 74,045804(2006).

25Al(p,)26Si: Parpottas, et al. Phys.Rev.C 73,049907(E) (2006).

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

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

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0.8

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1.8

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5.566.577.58

FP excitation energy (MeV)

YL

SA

en

erg

y

26Al(3He,t)26Si(p)25Al(g.s.)

26Mg(3He,t)26Al(p)25Mg

26Al(3He,t)26Si(p)25Al*

27Al(3He,t)27Si*(p)26Al

27Al(3He,t)27Si*(p)26Al

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 @ Barcelona

Rachel Lewis (‘05), PostDoc @ Univ.of York

Dale Visser (’03), Microsoft, Seattle

Alan Chen (’00), Faculty @ McMaster

Dan Bardayan (’99DNP), Wigner Fellow @ ORNL

Recent PostDocs:

Jac Caggiano @ Hanford Lab, Richland, WA

Will Bradfield-Smith @ Univ.Western Ontario