Exploring the neutron dripline two neutrons at a time: The first observations of the 26O and 16Be ground state resonances

Z. Kohley; A. Spyrou; E. Lunderberg; P. A. Deyoung; H. Attanayake; T. Baumann; D. Bazin; B. A. Brown; G. Christian; D. Divaratne; S. M. Grimes; A. Haagsma; J. E. Finck; N. Frank; B. Luther; S. Mosby; T. Nagi; G. F. Peaslee; W. A. Peters; A. Schiller; J. K. Smith; J. Snyder; M. J. Strongman; M. Thoennessen; A. Volya

doi:10.1088/1742-6596/420/1/012052

Exploring the neutron dripline two neutrons at a time: The first observations of the ²⁶O and ¹⁶Be ground state resonances

Z. Kohley^*, A. Spyrou, E. Lunderberg, P. A. Deyoung, H. Attanayake, T. Baumann, D. Bazin, B. A. Brown, G. Christian, D. Divaratne, S. M. Grimes, A. Haagsma, J. E. Finck, N. Frank, B. Luther, S. Mosby, T. Nagi, G. F. Peaslee, W. A. Peters, A. SchillerJ. K. Smith, J. Snyder, M. J. Strongman, M. Thoennessen, A. Volya

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

Abstract

The two-neutron unbound ground state resonances of ²⁶O and ¹⁶Be were populated using one-proton knockout reactions from ²⁷F and ¹⁷B beams. A coincidence measurement of 3-body system (fragment + n + n) allowed for the decay energy of the unbound nuclei to be reconstructed. A low energy resonance, < 200 keV, was observed for the first time in the ²⁴0 + n + n system and assigned to the ground state of ²⁶O. The ¹⁶Be ground state resonance was observed at 1.35 MeV. The 3-body correlations of the ¹⁴Be + n + n system were compared to simulations of a phase-space, sequential, and dineutron decay. The strong correlations in the n-n system from the experimental data could only be reproduced by the dineutron decay simulation providing the first evidence for a dineutron-like decay.

Original language	English (US)
Article number	012052
Journal	Journal of Physics: Conference Series
Volume	420
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/420/1/012052
State	Published - 2013
Externally published	Yes
Event	11th International Conference on Nucleus-Nucleus Collisions, NN 2012 - San Antonio, TX, United States Duration: May 27 2012 → Jun 1 2012

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1088/1742-6596/420/1/012052

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Kohley, Z., Spyrou, A., Lunderberg, E., Deyoung, P. A., Attanayake, H., Baumann, T., Bazin, D., Brown, B. A., Christian, G., Divaratne, D., Grimes, S. M., Haagsma, A., Finck, J. E., Frank, N., Luther, B., Mosby, S., Nagi, T., Peaslee, G. F., Peters, W. A., ... Volya, A. (2013). Exploring the neutron dripline two neutrons at a time: The first observations of the ²⁶O and ¹⁶Be ground state resonances. Journal of Physics: Conference Series, 420(1), [012052]. https://doi.org/10.1088/1742-6596/420/1/012052

@article{b2e7f88daece491b89166496c2428b38,

title = "Exploring the neutron dripline two neutrons at a time: The first observations of the 26O and 16Be ground state resonances",

abstract = "The two-neutron unbound ground state resonances of 26O and 16Be were populated using one-proton knockout reactions from 27F and 17B beams. A coincidence measurement of 3-body system (fragment + n + n) allowed for the decay energy of the unbound nuclei to be reconstructed. A low energy resonance, < 200 keV, was observed for the first time in the 240 + n + n system and assigned to the ground state of 26O. The 16Be ground state resonance was observed at 1.35 MeV. The 3-body correlations of the 14Be + n + n system were compared to simulations of a phase-space, sequential, and dineutron decay. The strong correlations in the n-n system from the experimental data could only be reproduced by the dineutron decay simulation providing the first evidence for a dineutron-like decay.",

author = "Z. Kohley and A. Spyrou and E. Lunderberg and Deyoung, {P. A.} and H. Attanayake and T. Baumann and D. Bazin and Brown, {B. A.} and G. Christian and D. Divaratne and Grimes, {S. M.} and A. Haagsma and Finck, {J. E.} and N. Frank and B. Luther and S. Mosby and T. Nagi and Peaslee, {G. F.} and Peters, {W. A.} and A. Schiller and Smith, {J. K.} and J. Snyder and Strongman, {M. J.} and M. Thoennessen and A. Volya",

year = "2013",

doi = "10.1088/1742-6596/420/1/012052",

language = "English (US)",

volume = "420",

journal = "Journal of Physics: Conference Series",

issn = "1742-6588",

publisher = "IOP Publishing Ltd.",

number = "1",

note = "11th International Conference on Nucleus-Nucleus Collisions, NN 2012 ; Conference date: 27-05-2012 Through 01-06-2012",

}

Kohley, Z, Spyrou, A, Lunderberg, E, Deyoung, PA, Attanayake, H, Baumann, T, Bazin, D, Brown, BA, Christian, G, Divaratne, D, Grimes, SM, Haagsma, A, Finck, JE, Frank, N, Luther, B, Mosby, S, Nagi, T, Peaslee, GF, Peters, WA, Schiller, A, Smith, JK, Snyder, J, Strongman, MJ, Thoennessen, M & Volya, A 2013, 'Exploring the neutron dripline two neutrons at a time: The first observations of the ²⁶O and ¹⁶Be ground state resonances', Journal of Physics: Conference Series, vol. 420, no. 1, 012052. https://doi.org/10.1088/1742-6596/420/1/012052

TY - JOUR

T1 - Exploring the neutron dripline two neutrons at a time

T2 - 11th International Conference on Nucleus-Nucleus Collisions, NN 2012

AU - Kohley, Z.

AU - Spyrou, A.

AU - Lunderberg, E.

AU - Deyoung, P. A.

AU - Attanayake, H.

AU - Baumann, T.

AU - Bazin, D.

AU - Brown, B. A.

AU - Christian, G.

AU - Divaratne, D.

AU - Grimes, S. M.

AU - Haagsma, A.

AU - Finck, J. E.

AU - Frank, N.

AU - Luther, B.

AU - Mosby, S.

AU - Nagi, T.

AU - Peaslee, G. F.

AU - Peters, W. A.

AU - Schiller, A.

AU - Smith, J. K.

AU - Snyder, J.

AU - Strongman, M. J.

AU - Thoennessen, M.

AU - Volya, A.

PY - 2013

Y1 - 2013

N2 - The two-neutron unbound ground state resonances of 26O and 16Be were populated using one-proton knockout reactions from 27F and 17B beams. A coincidence measurement of 3-body system (fragment + n + n) allowed for the decay energy of the unbound nuclei to be reconstructed. A low energy resonance, < 200 keV, was observed for the first time in the 240 + n + n system and assigned to the ground state of 26O. The 16Be ground state resonance was observed at 1.35 MeV. The 3-body correlations of the 14Be + n + n system were compared to simulations of a phase-space, sequential, and dineutron decay. The strong correlations in the n-n system from the experimental data could only be reproduced by the dineutron decay simulation providing the first evidence for a dineutron-like decay.

AB - The two-neutron unbound ground state resonances of 26O and 16Be were populated using one-proton knockout reactions from 27F and 17B beams. A coincidence measurement of 3-body system (fragment + n + n) allowed for the decay energy of the unbound nuclei to be reconstructed. A low energy resonance, < 200 keV, was observed for the first time in the 240 + n + n system and assigned to the ground state of 26O. The 16Be ground state resonance was observed at 1.35 MeV. The 3-body correlations of the 14Be + n + n system were compared to simulations of a phase-space, sequential, and dineutron decay. The strong correlations in the n-n system from the experimental data could only be reproduced by the dineutron decay simulation providing the first evidence for a dineutron-like decay.

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U2 - 10.1088/1742-6596/420/1/012052

DO - 10.1088/1742-6596/420/1/012052

M3 - Conference article

AN - SCOPUS:84875969596

SN - 1742-6588

VL - 420

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

IS - 1

M1 - 012052

Y2 - 27 May 2012 through 1 June 2012

ER -

Exploring the neutron dripline two neutrons at a time: The first observations of the ²⁶O and ¹⁶Be ground state resonances

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