Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phrvc..68d5803t&link_type=abstract
Physical Review C, vol. 68, Issue 4, id. 045803
Astronomy and Astrophysics
Astrophysics
2
Fundamental Aspects Of Astrophysics, Radiative Capture
Scientific paper
The 10 B ( p⃗ ,γ ) 11 C reaction was studied by detecting the γ -rays produced when 100-, 130-, and 160-keV polarized protons were stopped in a thick 10 B target. Polarized and unpolarized incident beams were used to measure the cross section and vector analyzing power as a function of angle and energy for capture to the ground ( Jπ =3/2- ) , the second ( E=4319 keV, Jπ =5/2- ) , and the fifth ( E=6478 keV, Jπ =7/2- ) excited states of 11 C . The data were analyzed to obtain the amplitudes and phases of the contributing transition-matrix elements at each measured energy for all three transitions. Values of the astrophysical S factors were obtained from the cross section data and are compared to previous results. A direct capture plus resonance model calculation was performed in an attempt to account for all measured quantities. It was found that the large ( ˜32% ) value of Ay ( 90° ) observed in the case of capture to the ground state could be accounted for by including the sub-threshold resonance at 8420 keV .
Crowley B. T.
Joshi Kirti
Kalantar--Nayestanaki N.
Kelley James H.
Nelson S. O.
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