Magnetic Trapping of Neutrons
作者： P. R. Huffman , C. R. Brome , J. S. Butterworth , K. J. Coakley , M. S. Dewey
DOI: 10.1038/47444
关键词:
摘要: Accurate measurement of the lifetime neutron (which is unstable to beta decay) important for understanding weak nuclear force and creation matter during Big Bang. Previous measurements have mainly been limited by certain systematic errors; however, these could in principle be avoided performing on neutrons stored a magnetic trap. Neutral charged particle traps are widely used tool studying both composite elementary particles, because they allow long interaction times isolation from perturbing environments. Here we report trapping neutrons. The region filled with superfluid 4-He, which load into trap as scintillator detect their decay. Neutrons 750 +330/-200 seconds, decay rather than losses. Our experiment verifies theoretical predictions regarding loading process Further refinement this method should lead improved precision measurement.
arxiv.org
128.84.21.199
nature.com参考文章(20)
D. Dubbers, Tests of the standard model with free neutron beta decay Nuclear Physics. ,vol. 527, pp. 239- 250 ,(1991) , 10.1016/0375-9474(91)90118-P
Robert E. Lopez, Michael S. Turner, An Accurate Calculation of the Big Bang Prediction for the Abundance of Primordial Helium Physical Review D. ,vol. 59, pp. 103502- ,(1999) , 10.1103/PHYSREVD.59.103502
J. M Doyle, S. K Lamoreaux, On Measuring the Neutron Beta-Decay Lifetime using Ultracold Neutrons Produced and Stored in a Superfluid-4He-Filled Magnetic Trap EPL. ,vol. 26, pp. 253- 258 ,(1994) , 10.1209/0295-5075/26/4/003
J Byrne, P. G Dawber, C. G Habeck, S. J Smidt, J. A Spain, A. P Williams, A revised value for the neutron lifetime measured using a Penning trap EPL. ,vol. 33, pp. 187- 192 ,(1996) , 10.1209/EPL/I1996-00319-X
W. Mampe, P. Ageron, C. Bates, J. M. Pendlebury, A. Steyerl, Neutron lifetime measured with stored ultracold neutrons. Physical Review Letters. ,vol. 63, pp. 593- 596 ,(1989) , 10.1103/PHYSREVLETT.63.593
W. Paul, F. Anton, L. Paul, S. Paul, W. Mampe, Measurement of the neutron lifetime in a magnetic storage ring European Physical Journal C. ,vol. 45, pp. 25- 30 ,(1989) , 10.1007/BF01556667
Harald F. Hess, Greg P. Kochanski, John M. Doyle, Naoto Masuhara, Daniel Kleppner, Thomas J. Greytak, Magnetic trapping of spin-polarized atomic hydrogen. Physical Review Letters. ,vol. 59, pp. 672- 675 ,(1987) , 10.1103/PHYSREVLETT.59.672
R. van Roijen, J. J. Berkhout, S. Jaakkola, J. T. M. Walraven, Experiments with atomic hydrogen in a magnetic trapping field. Physical Review Letters. ,vol. 61, pp. 931- 934 ,(1988) , 10.1103/PHYSREVLETT.61.931
John M. Doyle, Bretislav Friedrich, Jinha Kim, David Patterson, Buffer-gas loading of atoms and molecules into a magnetic trap Physical Review A. ,vol. 52, ,(1995) , 10.1103/PHYSREVA.52.R2515
R. Golub, J.M. Pendlebury, The interaction of Ultra-Cold Neutrons (UCN) with liquid helium and a superthermal UCN source Physics Letters A. ,vol. 62, pp. 337- 339 ,(1977) , 10.1016/0375-9601(77)90434-0