Breakup branches of Borromean beryllium-9

R. Smith; M. Freer; C. Wheldon; N. Curtis; S. Almaraz-Calderon; A. Aprahamian; N. I. Ashwood; M. Barr; B. Bucher; P. Copp; M. Couder; X. Fang; G. Goldring; F. Jung; Tz Kokalova; S. R. Lesher; W. Lu; J. D. Malcolm; A. Roberts; W. P. Tan; V. A. Ziman

doi:10.1063/1.4932289

Breakup branches of Borromean beryllium-9

R. Smith, M. Freer, C. Wheldon, N. Curtis, S. Almaraz-Calderon, A. Aprahamian, N. I. Ashwood, M. Barr, B. Bucher, P. Copp, M. Couder, X. Fang, G. Goldring, F. Jung, Tz Kokalova, S. R. Lesher, W. Lu, J. D. Malcolm, A. Roberts, W. P. TanV. A. Ziman

National & Homeland Security

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

3 Scopus citations

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, ⁸Be₂⁺ + 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.

Original language	English
Title of host publication	Nuclear Structure and Dynamics 2015
Editors	Matej Lipoglavsek, Matko Milin, Tamara Niksic, Suzana Szilner, Dario Vretenar
Publisher	American Institute of Physics Inc.
ISBN (Electronic)	9780735413283
DOIs	https://doi.org/10.1063/1.4932289
State	Published - Oct 15 2015
Event	3rd International Conference on Nuclear Structure and Dynamics - Portoroz, Slovenia Duration: Jun 14 2015 → Jun 19 2015

Publication series

Name	AIP Conference Proceedings
Volume	1681
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	3rd International Conference on Nuclear Structure and Dynamics
Country/Territory	Slovenia
City	Portoroz
Period	06/14/15 → 06/19/15

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10.1063/1.4932289

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Smith, R., Freer, M., Wheldon, C., Curtis, N., Almaraz-Calderon, S., Aprahamian, A., Ashwood, N. I., Barr, M., Bucher, B., Copp, P., Couder, M., Fang, X., Goldring, G., Jung, F., Kokalova, T., Lesher, S. R., Lu, W., Malcolm, J. D., Roberts, A., ... Ziman, V. A. (2015). Breakup branches of Borromean beryllium-9. In M. Lipoglavsek, M. Milin, T. Niksic, S. Szilner, & D. Vretenar (Eds.), Nuclear Structure and Dynamics 2015 Article 060003 (AIP Conference Proceedings; Vol. 1681). American Institute of Physics Inc.. https://doi.org/10.1063/1.4932289

@inproceedings{6d5242b61fa44b9a93f144d2b9d328fd,

title = "Breakup branches of Borromean beryllium-9",

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 8Beg.s. + n, 8Be2+ + n and 5Heg.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.",

author = "R. Smith and M. Freer and C. Wheldon and N. Curtis and S. Almaraz-Calderon and A. Aprahamian and Ashwood, {N. I.} and M. Barr and B. Bucher and P. Copp and M. Couder and X. Fang and G. Goldring and F. Jung and Tz Kokalova and Lesher, {S. R.} and W. Lu and Malcolm, {J. D.} and A. Roberts and Tan, {W. P.} and Ziman, {V. A.}",

note = "Publisher Copyright: {\textcopyright} 2015 AIP Publishing LLC.; 3rd International Conference on Nuclear Structure and Dynamics ; Conference date: 14-06-2015 Through 19-06-2015",

year = "2015",

month = oct,

day = "15",

doi = "10.1063/1.4932289",

language = "English",

series = "AIP Conference Proceedings",

publisher = "American Institute of Physics Inc.",

editor = "Matej Lipoglavsek and Matko Milin and Tamara Niksic and Suzana Szilner and Dario Vretenar",

booktitle = "Nuclear Structure and Dynamics 2015",

}

Smith, R, 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, T, Lesher, SR, Lu, W, Malcolm, JD, Roberts, A, Tan, WP & Ziman, VA 2015, Breakup branches of Borromean beryllium-9. in M Lipoglavsek, M Milin, T Niksic, S Szilner & D Vretenar (eds), Nuclear Structure and Dynamics 2015., 060003, AIP Conference Proceedings, vol. 1681, American Institute of Physics Inc., 3rd International Conference on Nuclear Structure and Dynamics, Portoroz, Slovenia, 06/14/15. https://doi.org/10.1063/1.4932289

Breakup branches of Borromean beryllium-9. / Smith, R.; Freer, M.; Wheldon, C. et al.
Nuclear Structure and Dynamics 2015. ed. / Matej Lipoglavsek; Matko Milin; Tamara Niksic; Suzana Szilner; Dario Vretenar. American Institute of Physics Inc., 2015. 060003 (AIP Conference Proceedings; Vol. 1681).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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T1 - Breakup branches of Borromean beryllium-9

AU - Smith, R.

AU - Freer, M.

AU - Wheldon, C.

AU - Curtis, N.

AU - Almaraz-Calderon, S.

AU - Aprahamian, A.

AU - Ashwood, N. I.

AU - Barr, M.

AU - Bucher, B.

AU - Copp, P.

AU - Couder, M.

AU - Fang, X.

AU - Goldring, G.

AU - Jung, F.

AU - Kokalova, Tz

AU - Lesher, S. R.

AU - Lu, W.

AU - Malcolm, J. D.

AU - Roberts, A.

AU - Tan, W. P.

AU - Ziman, V. A.

PY - 2015/10/15

Y1 - 2015/10/15

N2 - 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 8Beg.s. + n, 8Be2+ + n and 5Heg.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.

AB - 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 8Beg.s. + n, 8Be2+ + n and 5Heg.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.

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U2 - 10.1063/1.4932289

DO - 10.1063/1.4932289

M3 - Conference contribution

AN - SCOPUS:85006195296

T3 - AIP Conference Proceedings

BT - Nuclear Structure and Dynamics 2015

A2 - Lipoglavsek, Matej

A2 - Milin, Matko

A2 - Niksic, Tamara

A2 - Szilner, Suzana

A2 - Vretenar, Dario

PB - American Institute of Physics Inc.

T2 - 3rd International Conference on Nuclear Structure and Dynamics

Y2 - 14 June 2015 through 19 June 2015

ER -

Breakup branches of Borromean beryllium-9

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