Measurement of the neutron lifetime using a magneto-gravitational trap and in situ detection

被引：102

作者：

Pattie, R. W., Jr. ^{[1
]}

Callahan, N. B. ^{[2
,3
]}

Cude-Woods, C. ^{[1
,4
,5
]}

Adamek, E. R. ^{[2
,3
]}

Broussard, L. J. ^{[6
]}

Clayton, S. M. ^{[1
]}

Currie, S. A. ^{[1
]}

Dees, E. B. ^{[4
,5
]}

Ding, X. ^{[7
]}

Engel, E. M. ^{[8
]}

Fellers, D. E. ^{[1
]}

Fox, W. ^{[2
,3
]}

Geltenbort, P. ^{[9
]}

Hickerson, K. P. ^{[10
]}

Hoffbauer, M. A. ^{[1
]}

Holley, A. T. ^{[11
]}

Komives, A. ^{[12
]}

Liu, C. -Y. ^{[2
,3
]}

MacDonald, S. W. T. ^{[1
]}

Makela, M. ^{[1
]}

Morris, C. L. ^{[1
]}

Ortiz, J. D. ^{[1
]}

Ramsey, J. ^{[1
]}

Salvat, D. J. ^{[13
]}

Saunders, A. ^{[1
]}

Seestrom, S. J. ^{[1
,15
]}

Sharapov, E. I. ^{[14
]}

Sjue, S. K. ^{[1
]}

Tang, Z. ^{[1
]}

Vanderwerp, J. ^{[2
,3
]}

Vogelaar, B. ^{[7
]}

Walstrom, P. L. ^{[1
]}

Wang, Z. ^{[1
]}

Wei, W. ^{[1
]}

Weaver, H. L. ^{[1
]}

Wexler, J. W. ^{[4
,5
]}

Womack, T. L. ^{[1
]}

Young, A. R. ^{[4
,5
]}

Zeck, B. A. ^{[1
,4
,5
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Indiana Univ, Ctr Explorat Energy & Matter, Bloomington, IN 47408 USA

[3] Indiana Univ, Dept Phys, Bloomington, IN 47408 USA

[4] Triangle Univ Nucl Lab, Raleigh, NC 27695 USA

[5] North Carolina State Univ, Raleigh, NC 27695 USA

[6] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[7] Virginia Polytech Inst & State Univ, Dept Phys, Blacksburg, VA 24061 USA

[8] West Point Mil Acad, West Point, NY 10996 USA

[9] Inst Laue Langevin, Grenoble, France

[10] CALTECH, Kellogg Radiat Lab, Pasadena, CA 91125 USA

[11] Tennessee Technol Univ, Dept Phys, Cookeville, TN 38505 USA

[12] Depauw Univ, Dept Phys & Astron, Greencastle, IN 46135 USA

[13] Univ Washington, Dept Phys, Seattle, WA 98195 USA

[14] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia

[15] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA

来源：

SCIENCE | 2018年 / 360卷 / 6389期

基金：

美国国家科学基金会;

关键词：

ULTRACOLD NEUTRONS; SCATTERED NEUTRONS;

D O I：

10.1126/science.aan8895

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The precise value of the mean neutron lifetime, tau(n), plays an important role in nuclear and particle physics and cosmology. It is used to predict the ratio of protons to helium atoms in the primordial universe and to search for physics beyond the Standard Model of particle physics. We eliminated loss mechanisms present in previous trap experiments by levitating polarized ultracold neutrons above the surface of an asymmetric storage trap using a repulsive magnetic field gradient so that the stored neutrons do not interact with material trap walls. As a result of this approach and the use of an in situ neutron detector, the lifetime reported here [877.7 +/- 0.7 (stat) +0.4/-0.2 (sys) seconds] does not require corrections larger than the quoted uncertainties.

引用

页码：627 / 631

页数：5

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