This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440

Abduljalil, A.

Adams, G.S.

Bacher, A.D.

Blatt, S.L.

Hausman, H.J.

Kalen, J.

Kim, W.

Kovash, M.A.

Marchlenski, D.G.

English

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RADIATIVE CAPTURE 
PROTON RADIATIVE CAPTURE AT Ep = 150 MeV 
S.L. Blatt 
Clark University, Worcester, Massachusetts 01 61 0 
H.J. Hausman, A. Abduljalil, J. Kalen, W. Kim, D.G. Marchlenski 
The Ohio State University, Columbus, Ohio 4 521 0 
M.A. Kovash 
University of Kentucky, Lexington, Kentucky 40506 
G.S. Adams 
Rensselaer Polytechnic Institute, Troy, New York 12180 
A.D. Bacher 
Indiana University Cyclotron Facility, Bloomington, Indiana 4 74 05 
Recently there has been a revival of theoretical interest in modeling radiative capture 
reactions in the energy range from 100 MeV to the region of the A resonance near 300 MeV. 
Previous theoretical attempts to describe the 1 6 0  results of Leitch et al.' between 
100 and 400 MeV met with little success. The newer treatments of the capture reaction 
which utilize Dirac phenomenology and meson-exchange terms have had greater success in 
fitting the angular distributions and energy dependence of the Leitch results. The decision 
to pursue radiative proton capture in the range of 100-200 MeV was motivated by the 
possibility of measuring spin-dependent analyzing powers which should present a more 
stringent test of the newer models than cross-section data alone. 
During 1987, we performed a series of measurements of the l'B(p,r) "C reaction at 
150 MeV using a new detector system built around a 29 cm diameter by 38 cm long NaI 
crystal and designed for detecting 7-rays with energies up to 200 MeV. A spectrum of 
7-rays from the " B ( ~ , ~ )  reaction is shown in Fig. 1. Utilizing our empirically-determined 
line shape, captures populating the ground and two excited states can be resolved at 
E7 -. 150 MeV. Differential cross sections and analyzing powers were measured at only 
two angles at that time. The relativistic calculations by J.P. McDermott2 are in reasonably 
good agreement with this preliminary data. Currently the detector system is awaiting the 
installation of a ' ~ i  neutron shield. 
1. M.J. Leitch, J.L. Mathews, W.W. Sopp, C.P. Sargent, S.A. Wood, D.J.S. Findlay, 
R.O. Owens, and B.L. Roberts, Phys. Rev. C 31, 1633 (1985). 
2. J.P. McDermott, private communication. 
Figure 1. Spectrum of 7-rays from the 11B(p,7)12~ reaction at Ep = 150 MeV. The 
detector angle is 30". 


Proton Radiative Capture at E_p = 150 MeV

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Proton Radiative Capture at E_p = 150 MeV

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