Interference effects in the 11B(p, 3α) reaction at Ep = 163 keV

doi:10.1016/0375-9474(72)90135-2

Nuclear Physics A

Volume 186, Issue 1, 8 May 1972, Pages 200-208

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Abstract

The nuclear reaction ¹¹B(p, 3α) has been studied at E_p = 163 keV under kinematical conditions necessary for the observation of interference effects. Experimental information about these effects has been found for a few pairs of angles in a coplanar geometry. The change of the two-particle resonance width of the ⁸Be first excited state has been successfully explained.

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Cited by (9)

About the influence of space-time separations between sources of α-particle emission in the reaction p+11B→3α on interference phenomena in their spectra
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Ghost anomaly and first excited state of 8Be in the 9Be(d, tα)4He reaction at 7 MeV
1991, Nuclear Physics, Section A
The three-body reaction ⁹Be + d → t + α + α has been investigated in kinematically complete experiments at E_d = 7.0 MeV for θ_t = −40° and θ_t = 40°, θ_α = −72.5° to −162.5. The experimental spectra are dominated by sequential processes via intermediate excited states of ⁸Be and ⁷Li. R-matrix theory was employed to describe the line shape of the first excited state and the ghost anomaly of the ground state of ⁸Be. Use was made of the αα phase shifts. The best fits were obtained assuming a channel radius of a_αα = 4.5 fm. The average intensity of the ghost anomaly for E_αα = 0.35–1.0 MeV is 4.3%/MeV (θ_t = 40°) and 8%/MeV (θ_t = 100°). For the first excited state of ⁸Be we find E_x = 3.00 MeV and Γ_x = 1.23 MeV(FWHM).
The neutron-induced 12C(n, n′)3α reaction at 14.4 MeV in a kinematically complete experiment
1975, Nuclear Physics, Section A
A three-particle coincidence measurement of the n+¹²C → n+3α reaction at E_n = 14.4 MeV has been performed. The reaction proceeds via several sequential decay processes. The inelastic scattering of the incoming neutron on ¹²C and the subsequent 3α decay of the 9.36, 10.84, 11.83, and 12.71 MeV excited states of ¹²C amounts to 90 % of the total yield. 10 % of the total cross section is attributed to the ¹²C(n, α)⁹ Be (n, 2α) reaction proceeding through an intermediate ⁹Be state at 2.43 MeV. The density distributions of 3α correlation spectra are consistent with I^π assignments 3⁻, 1⁻, and 1+ anticipated for the 9.36, 10.84, and 12.71 MeV states of ¹²C, respectively. However, for the 11.83 MeV state of ¹²C the spin and parity value 1 ⁻ is suggested.
Complete kinematical study of the 3α breakup of the 16.11 MeV state in 12C
2016, European Physical Journal A
Low-energy cross sections for11B(p, 3α)
1987, Zeitschrift für Physik A Atomic Nuclei
Investigation of the reaction mechanisms in the11B+p → 3α Reaction at 20 MeV
1981, Il Nuovo Cimento A

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Nuclear Physics A

Abstract

References (12)

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Lett.

Nucl. Phys.

Nucl. Phys.

Cited by (9)

About the influence of space-time separations between sources of α-particle emission in the reaction p+<sup>11</sup>B→3α on interference phenomena in their spectra

Ghost anomaly and first excited state of <sup>8</sup>Be in the <sup>9</sup>Be(d, tα)<sup>4</sup>He reaction at 7 MeV

The neutron-induced <sup>12</sup>C(n, n′)3α reaction at 14.4 MeV in a kinematically complete experiment

Complete kinematical study of the 3α breakup of the 16.11 MeV state in <sup>12</sup>C

Low-energy cross sections for<sup>11</sup>B(p, 3α)

Investigation of the reaction mechanisms in the<sup>11</sup>B+p → 3α Reaction at 20 MeV