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[en] Differential cross sections for neutrons elastically scattered from 11B have been measured for 85 incident neutron energies for 2.6 <= Esub(n) <= 8.0 MeV corresponding to excitation in 12B of 5.7 to 10.7 MeV. The cross sections were measured at nine laboratory angles per energy from 200 to 1600 and show considerable resonance structure. These data, along with previously measured low-energy cross sections, have been analyzed for 0.1 <= Esub(n) <= 7.0 MeV with a multilevel-multichannel R-matrix program to make new assignments to states in 12B. The R-matrix calculation allows for change of l-value and for input in either j-j or L-S coupling schemes. A very good overall fit to the data is obtained over this wide range of excitation in 12B. Comparisons with existing theoretical work are discussed. (orig.)
Journal
Nuclear Physics. A; ISSN 0375-9474; 
; v. 340(1); p. 13-33
; v. 340(1); p. 13-33
[en] The dependence of resonance scattered photon intensities on the molecular orientation of the target was observed using bremsstrahlung photons. This was achieved in a self-absorption measurement by employing a 11B target in the form of pyrolytic boron nitride (PBN). (orig.)
Journal
Phys. Lett., B; ISSN 0370-2693; ; v. 92(3/4); p. 286-288
; v. 92(3/4); p. 286-288
[en] New data and preliminary results from an experimental study of the p + "1"1B reaction are presented. Using proton energies in the range of 167 – 170 keV the 2+ resonance in "1"2C at an excitation energy of 16.11 MeV was populated. Detecting the emitted a-particles in full kinematics allows us to study "1"2 C resonances and their properties. In addition to the 3-α break-up of the 16.11 MeV resonance we observe γ-transitions to lower lying resonances. Transitions to the 3"− state at 9.64MeV, the 1"− state at 10.84 MeV and the 1"+ state at 12.71 MeV are clearly seen. The transitions to the 1"− state has not been observed previously. In addition we see decays to structures of natural parity at excitation energies around 11-13 MeV. The results illustrate that the indirect detection of γ-decays is an effective technique for studying the low lying resonance spectrum of "1"2C
Journal
Journal of Physics. Conference Series (Online); ISSN 1742-6596; ; v. 569(1); [5 p.]
; v. 569(1); [5 p.]
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