Elastic scattering of 8He + 4He and two-neutron transfer and the influence of resonances in 12Be

Martin Freer; Carl Wheldon; Nicholas Ashwood; Neil Curtis; Victor Ziman; Tomas Munoz-Britton

doi:10.1016/j.physletb.2017.10.063

Elastic scattering of 8He + 4He and two-neutron transfer and the influence of resonances in 12Be

Martin Freer, Carl Wheldon, Nicholas Ashwood, Neil Curtis, Victor Ziman, Tomas Munoz-Britton

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Abstract

Scattering of 8He from 4He has been performed through the coincident detection of the scattered particles using a silicon array within a helium-4 gas volume with a 8He beam. This permitted the reconstruction of the interaction probability as a function of position within the gas and hence the excitation function to be calculated together with the angular distribution of the products. These measurements also enabled the reconstruction of the two-neutron transfer to 6He + 6He. The measurements provide the first characterisation of the scattering of the , 8He, halo nucleus from 4He and the 2n-transfer to populate the symmetric final state. The results indicate the presence of a component at excitation energies of 14–15 MeV, consistent with a broad () resonance. These measurements would agree with generalized two-centre cluster model (GTCM) calculations indicating a cluster, or molecular, structure predicted at this energy.

Original language	English
Pages (from-to)	58-62
Number of pages	5
Journal	Physics Letters B
Volume	775
Early online date	27 Oct 2017
DOIs	https://doi.org/10.1016/j.physletb.2017.10.063
Publication status	Published - 10 Dec 2017

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Freer_et_al_Elastic_scattering_of_8He+4He_and_Physics_Letters_B_2017
Checked for eligibility: 06/02/2018
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Birmingham Nuclear Physics Group Consolidated Grant
Jones, P. (Principal Investigator), Evans, P. (Co-Investigator), Freer, M. (Co-Investigator) & Wheldon, C. (Co-Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/08/14 → 30/09/18
Project: Research Councils
Birmingham Nuclear Physics Consolidated Grant
Freer, M. (Principal Investigator), Evans, P. (Co-Investigator), Jones, P. (Co-Investigator), Wheldon, C. (Co-Investigator) & Lazzeroni, C. (Co-Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/08/11 → 31/07/14
Project: Research Councils
Nuclear Structure, Astrophysics and Reactions (NuSTAR) at FAIR
Freer, M. (Principal Investigator) & Tungate, G. (Co-Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/07/09 → 31/03/15
Project: Research Councils

Cite this

@article{b5833282f9424c4ab7519d0deb3d1254,

title = "Elastic scattering of 8He + 4He and two-neutron transfer and the influence of resonances in 12Be",

abstract = "Scattering of 8He from 4He has been performed through the coincident detection of the scattered particles using a silicon array within a helium-4 gas volume with a 8He beam. This permitted the reconstruction of the interaction probability as a function of position within the gas and hence the excitation function to be calculated together with the angular distribution of the products. These measurements also enabled the reconstruction of the two-neutron transfer to 6He + 6He. The measurements provide the first characterisation of the scattering of the , 8He, halo nucleus from 4He and the 2n-transfer to populate the symmetric final state. The results indicate the presence of a component at excitation energies of 14–15 MeV, consistent with a broad () resonance. These measurements would agree with generalized two-centre cluster model (GTCM) calculations indicating a cluster, or molecular, structure predicted at this energy.",

author = "Martin Freer and Carl Wheldon and Nicholas Ashwood and Neil Curtis and Victor Ziman and Tomas Munoz-Britton",

year = "2017",

month = dec,

day = "10",

doi = "10.1016/j.physletb.2017.10.063",

language = "English",

volume = "775",

pages = "58--62",

journal = "Physics Letters B",

issn = "0370-2693",

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TY - JOUR

T1 - Elastic scattering of 8He + 4He and two-neutron transfer and the influence of resonances in 12Be

AU - Freer, Martin

AU - Wheldon, Carl

AU - Ashwood, Nicholas

AU - Curtis, Neil

AU - Ziman, Victor

AU - Munoz-Britton, Tomas

PY - 2017/12/10

Y1 - 2017/12/10

N2 - Scattering of 8He from 4He has been performed through the coincident detection of the scattered particles using a silicon array within a helium-4 gas volume with a 8He beam. This permitted the reconstruction of the interaction probability as a function of position within the gas and hence the excitation function to be calculated together with the angular distribution of the products. These measurements also enabled the reconstruction of the two-neutron transfer to 6He + 6He. The measurements provide the first characterisation of the scattering of the , 8He, halo nucleus from 4He and the 2n-transfer to populate the symmetric final state. The results indicate the presence of a component at excitation energies of 14–15 MeV, consistent with a broad () resonance. These measurements would agree with generalized two-centre cluster model (GTCM) calculations indicating a cluster, or molecular, structure predicted at this energy.

AB - Scattering of 8He from 4He has been performed through the coincident detection of the scattered particles using a silicon array within a helium-4 gas volume with a 8He beam. This permitted the reconstruction of the interaction probability as a function of position within the gas and hence the excitation function to be calculated together with the angular distribution of the products. These measurements also enabled the reconstruction of the two-neutron transfer to 6He + 6He. The measurements provide the first characterisation of the scattering of the , 8He, halo nucleus from 4He and the 2n-transfer to populate the symmetric final state. The results indicate the presence of a component at excitation energies of 14–15 MeV, consistent with a broad () resonance. These measurements would agree with generalized two-centre cluster model (GTCM) calculations indicating a cluster, or molecular, structure predicted at this energy.

U2 - 10.1016/j.physletb.2017.10.063

DO - 10.1016/j.physletb.2017.10.063

M3 - Letter

SN - 0370-2693

VL - 775

SP - 58

EP - 62

JO - Physics Letters B

JF - Physics Letters B

ER -

Elastic scattering of 8He + 4He and two-neutron transfer and the influence of resonances in 12Be

Abstract

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Projects

Birmingham Nuclear Physics Group Consolidated Grant

Birmingham Nuclear Physics Consolidated Grant

Nuclear Structure, Astrophysics and Reactions (NuSTAR) at FAIR

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