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Observation of Three-Neutron Sequential Emission from 25O

Sword, C., Brett, J., Baumann, T., Brown, B.A., Frank, N., Herman, J., Jones, M.D., Karrick, H., Kuchera, A.N., Thoennessen, M. , Tostevin, J.A., Tuttle-Timm, M. and DeYoung, P.A. (2019) Observation of Three-Neutron Sequential Emission from 25O Physical Review C, 100, 034323. 034323-1 - 034323-6.

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Abstract

Background: Measurements of neutron-unbound states can test nuclear models in very neutron-rich nuclei that in some cases cannot be probed with other methods.

Purpose: Search for highly excited neutron-unbound states of 25O above the three neutron separation energy.

Method: The decay energy of 25O was reconstructed using the invariant mass spectroscopy method. A 101.3 MeV/u 27Ne beam collided with a liquid deuterium target. Two-proton removal reactions populated excited 25O that decayed into three neutrons and an 22O fragment. The neutrons were detected by arrays of plastic scintillator bars, while a 4 Tm dipole magnet placed directly after the target redirected charged fragments to a series of charged-particle detectors. The data were compared with detailed Monte Carlo simulations of the reaction process and subsequent decay.

Results: The data show evidence of neutron-unbound level(s) in 25O at an excitation energy of about 9 MeV which decay sequentially by the emission of three neutrons to 22O.

Conclusion: The observation of resonance strength in 25O at about 9 MeV is consistent with shell-model/eikonal calculations for the two-proton removal reaction from 27Ne.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Sword, C.
Brett, J.
Baumann, T.
Brown, B.A.
Frank, N.
Herman, J.
Jones, M.D.
Karrick, H.
Kuchera, A.N.
Thoennessen, M.
Tostevin, J.A.J.Tostevin@surrey.ac.uk
Tuttle-Timm, M.
DeYoung, P.A.
Date : 26 September 2019
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1103/PhysRevC.100.034323
Copyright Disclaimer : © 2019 American Physical Society
Depositing User : Clive Harris
Date Deposited : 12 Sep 2019 07:21
Last Modified : 14 Oct 2019 12:56
URI: http://epubs.surrey.ac.uk/id/eprint/852602

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