Breakup branches of Borromean beryllium-9

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SMITH, Robin, FREER, M, WHELDON, C, CURTIS, N, ALMARAZ-CALDERON, S, APRAHAMIAN, A, ASHWOOD, NI, BARR, M, BUCHER, B, COPP, P, COUDER, M, FANG, X, GOLDRING, G, JUNG, F, KOKALOVA, Tz, LESHER, S R, LU, W, MALCOLM, J D, ROBERTS, A, TAN, W P and ZIMAN, V A (2015). Breakup branches of Borromean beryllium-9. In: LIPOGLAVSEK, Matej, MILIN, Matko, NIKSIC, Tamara, SZILNER, Suzana and VRETENAR, Dario, (eds.) Nuclear Structure and Dynamics '15. AIP Conference Proceedings (1681). AIP Publishing, 060003. [Book Section]

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21587:494211

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21587:494211

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Abstract

The breakup reaction 9Be(4He, 3α)n was measured using an array of four double-sided silicon strip detectors at beam energies of 22 and 26 MeV. Excited states in 9Be up to 12 MeV were populated and reconstructed through the measurement of the charged reaction products. It is proposed that limits on the spins and parities of the states can be derived from the way that they decay. Various breakup paths for excited states in 9Be have been explored including the 8Be(g.s.) + n, 8Be(2+) + n and 5He(g.s.) + 4He channels. By imposing the condition that the breakup proceeded via the 8Be ground state, clean excitation spectra for 9Be were reconstructed. The remaining two breakup channels were found to possess strongly-overlapping kinematic signatures and more sophisticated methods (referenced) are required to completely disentangle these other possibilities. Emphasis is placed on the development of the experimental analysis and the usefulness of Monte-Carlo simulations for this purpose.

More Information

Official URL:

https://aip.scitation.org/doi/10.1063/1.4932289

Additional Information:

ISSN: 0094-243X, ESSN: 1551-7616

Departments - Does NOT include content added after October 2018:

Faculty of Science, Technology and Arts > Department of Engineering and Mathematics

Page Range:

060003

Event Location:

Portoroz, Slovenia

ISBN: