Structure of He10 Low-Lying States Uncovered by Correlations

S. I. Sidorchuk et al.
Phys. Rev. Lett. 108, 202502 – Published 15 May 2012

Abstract

The 0+ ground state of the He10 nucleus produced in the H3(He8,p)He10 reaction was found at about 2.1±0.2MeV (Γ2MeV) above the three-body He8+n+n breakup threshold. Angular correlations observed for He10 decay products show prominent interference patterns allowing us to draw conclusions about the structure of low-energy excited states. We interpret the observed correlations as a coherent superposition of a broad 1 state having a maximum at energy 4–6 MeV and a 2+ state above 6 MeV, setting both on top of the 0+ state “tail.” This anomalous level ordering indicates that the breakdown of the N=8 shell known in Be12 thus extends also to the He10 system.

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  • Received 8 February 2012

DOI:https://doi.org/10.1103/PhysRevLett.108.202502

© 2012 American Physical Society

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Vol. 108, Iss. 20 — 18 May 2012

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