3α decay of the 10.84 and 11.83 MeV states of 12C

doi:10.1016/0375-9474(75)90423-6

Nuclear Physics A

Volume 237, Issue 2, 13 January 1975, Pages 253-259

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Abstract

The theoretical density distributions for the ¹²C-3α break-up have been compared with those obtained experimentally for the 10.84 and 11.83 MeV states of ¹²C. The spin and parity assignment of the 11.83 MeV state of ¹²C has been deduced from the analysis of data.

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Cited by (5)

Energy levels of light nuclei A = 12
2017, Nuclear Physics A
Monte Carlo analysis of the four-body final state in the neutron-induced <sup>12</sup>C breakup
1991, Nuclear Physics, Section A
The expectation spectra obtained by the Monte Carlo simulation of those reaction mechanisms which are known to occur in the interactions of light nuclei have been compared with the experimental distributions of various physical variables obtained from a complete measurement, in 4π geometry, of the ¹²C(n, n3α) reaction. By the use of this method, contributions of various reaction channels, including the three-body nα⁸Be and the four-body nααα simultaneous breakup, have been extracted. The present study has also shown that the Monte Carlo simulation of the sequential reaction mechanism alone may be successfully used in modelling the four-body n3α final state. This is true for any variable or correlation of variables and for any specific experimental condition, provided the known ¹²C excitation spectra with given branching ratios to the transition via ⁸Be_g.s. are used as input data for the Monte Carlo simulation.
The neutron-induced <sup>12</sup>C(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.
Momentum distributions of α particles from decaying low-lying C12 resonances
2008, Physical Review C - Nuclear Physics
Reexamination of the excited states of C12
2007, Physical Review C - Nuclear Physics

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3α decay of the 10.84 and 11.83 MeV states of 12C

Abstract

J. de Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Energy levels of light nuclei

NAS-NRC, 61

Energy levels of light nuclei

NAS-NRC, 61

3α decay of the 10.84 and 11.83 MeV states of ¹²C