First Direct Mass Measurement of the Two-Neutron Halo Nucleus 6He and Improved Mass for the Four-Neutron Halo 8He

被引：88

作者：

Brodeur, M. ^{[1
,2
]}

Brunner, T. ^{[1
,3
]}

Champagne, C. ^{[1
,4
]}

Ettenauer, S. ^{[1
,2
]}

Smith, M. J. ^{[1
,2
]}

Lapierre, A. ^{[1
]}

Ringle, R. ^{[1
]}

Ryjkov, V. L. ^{[1
]}

Bacca, S. ^{[1
]}

Delheij, P. ^{[1
]}

Drake, G. W. F. ^{[5
]}

Lunney, D. ^{[6
]}

Schwenk, A. ^{[7
,8
]}

Dilling, J. ^{[1
,2
]}

机构：

[1] TRIUMF, Vancouver, BC V6T 2A3, Canada

[2] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[3] Tech Univ Munich, Phys Dept E12, D-8046 Garching, Germany

[4] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[5] Univ Windsor, Windsor, ON N9B 3P4, Canada

[6] Univ Paris 11, CSNSM CNRS IN2P3, F-91405 Orsay, France

[7] GSI Helmholtzzentrum Schwerionenforsch GmbH, ExtreMe Matter Inst EMMI, D-64291 Darmstadt, Germany

[8] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 05期

基金：

加拿大自然科学与工程研究理事会;

关键词：

NEUTRON HALO;

D O I：

10.1103/PhysRevLett.108.052504

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The first direct mass measurement of He-6 has been performed with the TITAN Penning trap mass spectrometer at the ISAC facility. In addition, the mass of He-8 was determined with improved precision over our previous measurement. The obtained masses are m(He-6) 6.018 885 883(57) u and m(He-8) = 8.033 934 44(11) u. The He-6 value shows a deviation from the literature of 4 sigma. 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 He-6 and He-8, respectively. We present a detailed comparison to nuclear theory for He-6, 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.

引用

页数：5

共 35 条

[1] The AME2003 atomic mass evaluation (II). Tables, graphs and references [J].

Audi, G ;

Wapstra, AH ;

Thibault, C .

NUCLEAR PHYSICS A, 2003, 729 (01) :337-676

[2] Helium halo nuclei from low-momentum interactions [J].

Bacca, S. ;

Schwenk, A. ;

Hagen, G. ;

Papenbrock, T. .

EUROPEAN PHYSICAL JOURNAL A, 2009, 42 (03) :553-558

[3]

BACCA S, IN PRESS

[4] Effective field theory for few-nucleon systems [J].

Bedaque, PF ;

van Kolck, U .

ANNUAL REVIEW OF NUCLEAR AND PARTICLE SCIENCE, 2002, 52 :339-396

[5] From low-momentum interactions to nuclear structure [J].

Bogner, S. K. ;

Furnstahl, R. J. ;

Schwenk, A. .

PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, 2010, 65 (01) :94-147

[6]

Bricault P., 2008, REV SCI INSTRUM, V79

[7] Two-neutron overlap functions for 6He from a microscopic structure model [J].

Brida, I. ;

Nunes, F. M. .

NUCLEAR PHYSICS A, 2010, 847 (1-2) :1-23

[8] Verifying the accuracy of the TITAN Penning-trap mass spectrometer [J].

Brodeur, M. ;

Ryjkov, V. L. ;

Brunner, T. ;

Ettenauer, S. ;

Gallant, A. T. ;

Simon, V. V. ;

Smith, M. J. ;

Lapierre, A. ;

Ringle, R. ;

Delheij, P. ;

Good, M. ;

Lunney, D. ;

Dilling, J. .

INTERNATIONAL JOURNAL OF MASS SPECTROMETRY, 2012, 310 :20-31

[9] New mass measurement of 6Li and ppb-level systematic studies of the Penning trap mass spectrometer TITAN [J].

Brodeur, M. ;

Brunner, T. ;

Champagne, C. ;

Ettenauer, S. ;

Smith, M. ;

Lapierre, A. ;

Ringle, R. ;

Ryjkov, V. L. ;

Audi, G. ;

Delheij, P. ;

Lunney, D. ;

Dilling, J. .

PHYSICAL REVIEW C, 2009, 80 (04)

[10]

Brodeur M., 2010, THESIS U BRIT COLUMB

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