Measurement of the branching ratio for $\beta$-delayed $\alpha$ decay of $^{16}$N - INSPIRE

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Measurement of the branching ratio for $\beta$ -delayed $\alpha$ decay of $^{16}$ N

Jun 30, 2015

6 pages

Published in:

Phys.Lett.B 752 (2016) 296-301

Published: Jan 10, 2016

e-Print:

1506.09020 [nucl-ex]

DOI:

10.1016/j.physletb.2015.11.047

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Abstract: (Elsevier)

While the C12(α,γ)16O reaction plays a central role in nuclear astrophysics, the cross section at energies relevant to hydrostatic helium burning is too small to be directly measured in the laboratory. The β -delayed α spectrum of 16 N can be used to constrain the extrapolation of the E1 component of the S -factor; however, with this approach the resulting S -factor becomes strongly correlated with the assumed βα branching ratio. We have remeasured the βα branching ratio by implanting 16 N ions in a segmented Si detector and counting the number of βα decays relative to the number of implantations. Our result, 1.49(5)×10−5 , represents a 24% increase compared to the accepted value and implies an increase of ≈10% in the extrapolated S -factor.

23.40.-s
26.20.Fj
27.20.+n
β decay
Stellar helium burning
Properties of specific nuclei 6≤A≤19
Properties of specific nuclei [formula omitted]

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