تقرير
Storage of ultracold neutrons in the UCN$\tau$ magneto-gravitational trap
| العنوان: | Storage of ultracold neutrons in the UCN$\tau$ magneto-gravitational trap |
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| المؤلفون: | Salvat, D. J., Adamek, E. R., Barlow, D., Broussard, L. J., Bowman, J. D., Callahan, N. B., Clayton, S. M., Cude-Woods, C., Currie, S., Dees, E. B., Fox, W., Geltenbort, P., Hickerson, K. P., Holley, A. T., Liu, C. -Y., Makela, M., Medina, J., Morley, D. J., Morris, C. L., Penttila, S. I., Ramsey, J., Saunders, A., Seestrom, S. J., Sjue, S. K. L., Slaughter, B. A., Sharapov, E. I., Vanderwerp, J., VornDick, B., Walstrom, P. L., Wang, Z., Womack, T. L., Young, A. R. |
| المصدر: | Phys. Rev. C 89, 052501 (2014) |
| سنة النشر: | 2013 |
| المجموعة: | Nuclear Experiment Physics (Other) |
| مصطلحات موضوعية: | Physics - Instrumentation and Detectors, Nuclear Experiment |
| الوصف: | 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 provide a background "holding" field to eliminate depolarization-induced UCN loss caused by magnetic field nodes. We present a measurement of the storage time $\tau_{store}$ 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 $\tau_{store}=860\pm19$ s: within $1 \sigma$ of current global averages for $\tau_{n}$. The storage time with the holding field deactiveated is found to be $\tau_{store}=470 \pm 160$ 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. Comment: 6 pages, 5 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevC.89.052501 |
| URL الوصول: | http://arxiv.org/abs/1310.5759 |
| رقم الأكسشن: | edsarx.1310.5759 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevC.89.052501 |
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