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Haun R, Wietfeldt FE, Arif M, Huber MG, Black TC, Heacock B, Pushin DA, Shahi CB. Precision Measurement of the Neutron Scattering Length of ^{4}He Using Neutron Interferometry. Phys Rev Lett 2020; 124:012501. [PMID: 31976711 PMCID: PMC8609613 DOI: 10.1103/physrevlett.124.012501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Indexed: 06/10/2023]
Abstract
We report a 0.08% measurement of the bound neutron scattering length of ^{4}He using neutron interferometry. The result is b=(3.0982±0.0021[stat]±0.0014[syst]) fm. The corresponding free atomic scattering length is a=(2.4746±0.0017[stat]±0.0011[syst]) fm. With this result the world average becomes b=(3.0993±0.0025) fm, a 2% downward shift and a reduction in uncertainty by more than a factor of six. Our result is in disagreement with a previous neutron interferometric measurement but is in good agreement with earlier measurements using neutron transmission.
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Affiliation(s)
- R Haun
- Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA
| | - F E Wietfeldt
- Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA
| | - M Arif
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - M G Huber
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - T C Black
- Department of Physics, University of North Carolina-Wilmington, Wilmington, North Carolina 28403, USA
| | - B Heacock
- Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA
| | - D A Pushin
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada and Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - C B Shahi
- Department of Physics, University of Maryland, College Park, Maryland 20742, USA
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Huber MG, Arif M, Black TC, Chen WC, Gentile TR, Hussey DS, Pushin DA, Wietfeldt FE, Yang L. Precision measurement of the n-3He incoherent scattering length using neutron interferometry. Phys Rev Lett 2009; 102:200401. [PMID: 19519009 DOI: 10.1103/physrevlett.102.200401] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2008] [Revised: 02/19/2009] [Indexed: 05/27/2023]
Abstract
We report the first measurement of the low-energy neutron-(3)He incoherent scattering length using neutron interferometry: b_{i};{'} = (-2.512 +/- 0.012 stat +/- 0.014 syst) fm. This is in good agreement with a recent calculation using the AV18 + 3N potential. The neutron-(3)He scattering lengths are important for testing and developing nuclear potential models that include three-nucleon forces, effective field theories for few-body nuclear systems, and neutron scattering measurements of quantum excitations in liquid helium. This work demonstrates the first use of a polarized nuclear target in a neutron interferometer.
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Affiliation(s)
- M G Huber
- Tulane University, New Orleans, Louisiana 70118, USA
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Black TC, Huffman PR, Jacobson DL, Snow WM, Schoen K, Arif M, Kaiser H, Lamoreaux SK, Werner SA. Precision neutron interferometric measurement of the nd coherent neutron scattering length and consequences for models of three-nucleon forces. Phys Rev Lett 2003; 90:192502. [PMID: 12785940 DOI: 10.1103/physrevlett.90.192502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2002] [Indexed: 05/24/2023]
Abstract
We have performed the first high precision measurement of the coherent neutron scattering length of deuterium in a pure sample using neutron interferometry. We find b(nd)=(6.665+/-0.004) fm in agreement with the world average of previous measurements using different techniques, b(nd)=(6.6730+/-0.0045) fm. We compare the new world average for the nd coherent scattering length b(nd)=(6.669+/-0.003) fm to calculations of the doublet and quartet scattering lengths from several modern nucleon-nucleon potential models with three-nucleon force (3NF) additions and show that almost all theories are in serious disagreement with experiment. This comparison is a more stringent test of the models than past comparisons with the less precisely determined doublet scattering length of (2)a(nd)=(0.65+/-0.04) fm.
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Affiliation(s)
- T C Black
- University of North Carolina at Wilmington, Wilmington, North Carolina 28403-3297, USA
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Fletcher KA, Ayer Z, Black TC, Das RK, Karwowski HJ, Ludwig EJ, Hale GM. Tensor analyzing powers for 2H(d,p)3H and 2H(d,n)3He at deuteron energies of 25, 40, 60, and 80 keV. Phys Rev C Nucl Phys 1994; 49:2305-2310. [PMID: 9969476 DOI: 10.1103/physrevc.49.2305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Somlo AM, Black TC, Somlo LI. The value of fluorescence microscopy in the detection of acid-fast bacteria. Tech Bull Regist Med Technol 1969; 39:51-4. [PMID: 5775262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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