First direct mass measurement of the two-neutron halo nucleus He6 and improved mass for the four-neutron halo He8

M. Brodeur; T. Brunner; C. Champagne; S. Ettenauer; M. J. Smith; A. Lapierre; R. Ringle; V. L. Ryjkov; S. Bacca; P. Delheij; G. W.F. Drake; D. Lunney; A. Schwenk; J. Dilling

doi:10.1103/PhysRevLett.108.052504

First direct mass measurement of the two-neutron halo nucleus He6 and improved mass for the four-neutron halo He8

M. Brodeur, T. Brunner, C. Champagne, S. Ettenauer, M. J. Smith, A. Lapierre, R. Ringle, V. L. Ryjkov, S. Bacca, P. Delheij, G. W.F. Drake, D. Lunney, A. Schwenk, J. Dilling

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Abstract

The first direct mass measurement of He6 has been performed with the TITAN Penning trap mass spectrometer at the ISAC facility. In addition, the mass of He8 was determined with improved precision over our previous measurement. The obtained masses are m(He6)=6.018885883(57)u and m(He8)=8.03393444(11)u. The He6 value shows a deviation from the literature of 4σ. With these new mass values and the previously measured atomic isotope shifts we obtain charge radii of 2.060(8) and 1.959(16)fm for He6 and He8, respectively. We present a detailed comparison to nuclear theory for He6, including new hyperspherical harmonics results. A correlation plot of the point-proton radius with the two-neutron separation energy demonstrates clearly the importance of three-nucleon forces.

Original language	English
Article number	052504
Journal	Physical Review Letters
Volume	108
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.108.052504
State	Published - Jan 31 2012
Externally published	Yes

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Brodeur, M., Brunner, T., Champagne, C., Ettenauer, S., Smith, M. J., Lapierre, A., Ringle, R., Ryjkov, V. L., Bacca, S., Delheij, P., Drake, G. W. F., Lunney, D., Schwenk, A., & Dilling, J. (2012). First direct mass measurement of the two-neutron halo nucleus He6 and improved mass for the four-neutron halo He8. Physical Review Letters, 108(5), Article 052504. https://doi.org/10.1103/PhysRevLett.108.052504

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title = "First direct mass measurement of the two-neutron halo nucleus He6 and improved mass for the four-neutron halo He8",

abstract = "The first direct mass measurement of He6 has been performed with the TITAN Penning trap mass spectrometer at the ISAC facility. In addition, the mass of He8 was determined with improved precision over our previous measurement. The obtained masses are m(He6)=6.018885883(57)u and m(He8)=8.03393444(11)u. The He6 value shows a deviation from the literature of 4σ. With these new mass values and the previously measured atomic isotope shifts we obtain charge radii of 2.060(8) and 1.959(16)fm for He6 and He8, respectively. We present a detailed comparison to nuclear theory for He6, including new hyperspherical harmonics results. A correlation plot of the point-proton radius with the two-neutron separation energy demonstrates clearly the importance of three-nucleon forces.",

author = "M. Brodeur and T. Brunner and C. Champagne and S. Ettenauer and Smith, {M. J.} and A. Lapierre and R. Ringle and Ryjkov, {V. L.} and S. Bacca and P. Delheij and Drake, {G. W.F.} and D. Lunney and A. Schwenk and J. Dilling",

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doi = "10.1103/PhysRevLett.108.052504",

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Brodeur, M, Brunner, T, Champagne, C, Ettenauer, S, Smith, MJ, Lapierre, A, Ringle, R, Ryjkov, VL, Bacca, S, Delheij, P, Drake, GWF, Lunney, D, Schwenk, A & Dilling, J 2012, 'First direct mass measurement of the two-neutron halo nucleus He6 and improved mass for the four-neutron halo He8', Physical Review Letters, vol. 108, no. 5, 052504. https://doi.org/10.1103/PhysRevLett.108.052504

TY - JOUR

T1 - First direct mass measurement of the two-neutron halo nucleus He6 and improved mass for the four-neutron halo He8

AU - Brodeur, M.

AU - Brunner, T.

AU - Champagne, C.

AU - Ettenauer, S.

AU - Smith, M. J.

AU - Lapierre, A.

AU - Ringle, R.

AU - Ryjkov, V. L.

AU - Bacca, S.

AU - Delheij, P.

AU - Drake, G. W.F.

AU - Lunney, D.

AU - Schwenk, A.

AU - Dilling, J.

PY - 2012/1/31

Y1 - 2012/1/31

N2 - The first direct mass measurement of He6 has been performed with the TITAN Penning trap mass spectrometer at the ISAC facility. In addition, the mass of He8 was determined with improved precision over our previous measurement. The obtained masses are m(He6)=6.018885883(57)u and m(He8)=8.03393444(11)u. The He6 value shows a deviation from the literature of 4σ. With these new mass values and the previously measured atomic isotope shifts we obtain charge radii of 2.060(8) and 1.959(16)fm for He6 and He8, respectively. We present a detailed comparison to nuclear theory for He6, including new hyperspherical harmonics results. A correlation plot of the point-proton radius with the two-neutron separation energy demonstrates clearly the importance of three-nucleon forces.

AB - The first direct mass measurement of He6 has been performed with the TITAN Penning trap mass spectrometer at the ISAC facility. In addition, the mass of He8 was determined with improved precision over our previous measurement. The obtained masses are m(He6)=6.018885883(57)u and m(He8)=8.03393444(11)u. The He6 value shows a deviation from the literature of 4σ. With these new mass values and the previously measured atomic isotope shifts we obtain charge radii of 2.060(8) and 1.959(16)fm for He6 and He8, respectively. We present a detailed comparison to nuclear theory for He6, including new hyperspherical harmonics results. A correlation plot of the point-proton radius with the two-neutron separation energy demonstrates clearly the importance of three-nucleon forces.

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First direct mass measurement of the two-neutron halo nucleus He6 and improved mass for the four-neutron halo He8

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