Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session CJ: Mini-Symposium on Fundamental Neutron Physics I
7:00 PM–9:15 PM,
Wednesday, October 24, 2018
Hilton
Room: Kona 5
Chair: Geoffrey Greene, University of Tennessee
Abstract ID: BAPS.2018.HAW.CJ.5
Abstract: CJ.00005 : Precise Neutron Lifetime Measurement with a Gaseous Detector and a Solenoidal Magnet*
8:15 PM–8:30 PM
Presenter:
Naoyuki Sumi
(Dept. of Phys., Kyushu Univ.)
Authors:
Naoyuki Sumi
(Dept. of Phys., Kyushu Univ.)
Hideaki Uehara
(Dept. of Phys., Kyushu Univ.)
Tomoya Nagano
(Dept. of Phys., Kyushu Univ.)
So Makise
(Dept. of Phys., Kyushu Univ.)
Tamaki Yoshioka
(RCAPP, Kyushu Univ.)
Hidetoshi Otono
(RCAPP, Kyushu Univ.)
Kenji Mishima
(KEK)
Yasuhiro Makida
(KEK)
The neutron lifetime, τ = 880.2 ± 1.0 sec, is an important parameter for particle/nuclear physics and cosmology. There is, however, an 8.4 sec (4.0 σ) deviation between the measured value of the neutron lifetime using two methods. A new method is being implemented at J-PARC / MLF / BL05 using a pulsed cold neutron beam. A Time Projection Chamber records both the electrons from neutron beta decay and protons from the neutron-3He capture reactions in order to estimate the neutron flux. However, electron background signals require the largest correction and are source of uncertainty for this type experiment. It is confirmed by Monte Carlo simulation that an uniform magnetic field along the neutron beam can greatly reduce this background. Hence, we proposed another experiment (LiNA experiment) using a solenoidal magnet. The detector was constructed and operation with neutron beam is carried out soon. We will present the status and future plan of this experiment.
*KEK S-type research projects with program numbers : 2014S03 JSPS KAKENHI Grant No. 18H01231 and No. 18J10106 Grant for Basic Science Research Projects from The Sumitomo Foundation 2016
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.CJ.5
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