Storage of ultracold neutrons in the magneto-gravitational trap of the UCNτ experiment

被引：24

作者：

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

Adamek, E. R. ^{[1
]}

Barlow, D. ^{[2
]}

Bowman, J. D. ^{[3
]}

Broussard, L. J. ^{[2
]}

Callahan, N. B. ^{[1
]}

Clayton, S. M. ^{[2
]}

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

Currie, S. ^{[2
]}

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

Fox, W. ^{[1
]}

Geltenbort, P. ^{[5
]}

Hickerson, K. P. ^{[6
]}

Holley, A. T. ^{[1
]}

Liu, C. -Y. ^{[1
]}

Makela, M. ^{[2
]}

Medina, J. ^{[2
]}

Morley, D. J. ^{[2
]}

Morris, C. L. ^{[2
]}

Penttilae, S. I. ^{[3
]}

Ramsey, J. ^{[2
]}

Saunders, A. ^{[2
]}

Seestrom, S. J. ^{[2
]}

Sharapov, E. I. ^{[7
]}

Sjue, S. K. L. ^{[2
]}

Slaughter, B. A. ^{[1
]}

Vanderwerp, J. ^{[1
]}

VornDick, B. ^{[4
]}

Walstrom, P. L. ^{[2
]}

Wang, Z. ^{[2
]}

Womack, T. L. ^{[2
]}

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

机构：

[1] Indiana Univ, Bloomington, IN 47405 USA

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

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

[4] N Carolina State Univ, Raleigh, NC 27695 USA

[5] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

[6] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[7] Joint Inst Nucl Res, Dubna 141980, Russia

来源：

PHYSICAL REVIEW C | 2014年 / 89卷 / 05期

关键词：

MAGNETIC TRAP; COLD NEUTRONS; LIFETIME; CHAMBER;

D O I：

10.1103/PhysRevC.89.052501

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The UCN tau experiment is designed to measure the lifetime tau(n) of the free neutron by trapping ultracold neutrons (UCN) in a magneto-gravitational trap. An asymmetric bowl-shaped NdFeB magnet Halbach array confines low-field-seeking UCN within the apparatus, and a set of electromagnetic coils in a toroidal geometry provides a background "holding" field to eliminate depolarization-induced UCN loss caused by magnetic field nodes. We present a measurement of the storage time tstore of the trap by storing UCN for various times and counting the survivors. The data are consistent with a single exponential decay, and we find tau(store) = 860 +/- 19 s, within 1s of current global averages for tau(n). The storage time with the holding field deactivated is found to be tau(store) = 470 +/- 160 s; this decreased storage time is due to the loss of UCN, which undergo Majorana spin flips while being stored. We discuss plans to increase the statistical sensitivity of the measurement and investigate potential systematic effects.

引用

页数：6

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