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Magnetic trapping of neutrons for measurement of the neutron lifetime

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Magnetic trapping of neutrons for measurement of the neutron lifetime
作者:	Dzhosyuk, Sergei N.
面頁冊數:	199 p.
附註:	Adviser: John M. Doyle.
附註:	Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2465.
Contained By:	Dissertation Abstracts International65-05B.
標題:	Physics, Nuclear.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3131828
ISBN:	0496790684

Magnetic trapping of neutrons for measurement of the neutron lifetime
Dzhosyuk, Sergei N.

Magnetic trapping of neutrons for measurement of the neutron lifetime [electronic resource] - 199 p.

Adviser: John M. Doyle.

Thesis (Ph.D.)--Harvard University, 2004.

An experiment to measure the free neutron lifetime using magnetically trapped neutrons is described. Neutrons are loaded into a 1.1 T deep superconducting Ioffe-type trap by scattering an 0.89 nm neutron beam in an isotopically pure superfluid 4He bath cooled to below 300 mK. The neutron decays are detected by the scintillation light produced in the helium by the neutron decay products. The 0.89 nm neutron beam is produced by diffracting a cold neutron beam from a potassium intercalated graphite monochromator.

ISBN: 0496790684Subjects--Topical Terms:

227654
Physics, Nuclear.

Magnetic trapping of neutrons for measurement of the neutron lifetime
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520 # $a An experiment to measure the free neutron lifetime using magnetically trapped neutrons is described. Neutrons are loaded into a 1.1 T deep superconducting Ioffe-type trap by scattering an 0.89 nm neutron beam in an isotopically pure superfluid 4He bath cooled to below 300 mK. The neutron decays are detected by the scintillation light produced in the helium by the neutron decay products. The 0.89 nm neutron beam is produced by diffracting a cold neutron beam from a potassium intercalated graphite monochromator.
520 # $a An increase in the thermal upscattering rate is observed in the temperature range 0.5 K ≤ T ≤ 0.85 K. A number of other systematic effects are studied.
520 # $a The measured trap lifetime at 300 mK and with no ameliorative magnetic ramping is substantially shorter than the free neutron lifetime. This is attributed to the presence of neutrons with an energy higher than the magnetic potential of the trap. Magnetic field ramping is implemented to eliminate these neutrons, resulting in an 833+74-63 s trap lifetime, that is consistent with the currently accepted value of the free neutron lifetime.
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