Neutron lifetime measurements and analysis in a heterogeneous thermal reactor system

1993 ◽  
Author(s):  
Russell M. Ball ◽  
Gary S. Hoovler ◽  
Edward J. Parma ◽  
Elizabeth C. Selcow ◽  
Ralph J. Cerbone
Keyword(s):  
Reactor System ◽  
Thermal Reactor ◽  
Neutron Lifetime ◽  
Lifetime Measurements

scholarly journals A meta-analysis of neutron lifetime measurements

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Ashwani Rajan ◽  
Shantanu Desai
Keyword(s):  
Gaussian Distribution ◽  
Meta Analysis ◽  
Cauchy Distribution ◽  
Neutron Lifetime ◽  
Weighted Mean ◽  
Lifetime Measurements ◽  
Median Estimate ◽  
Error Distributions ◽  
Student’S T ◽  
Data Group

Abstract We calculate the median as well as weighted mean central estimates for the neutron lifetime from a subset of measurements compiled in the 2019 update of the Particle Data Group (PDG). We then reconstruct the error distributions for the residuals using three different central estimates and then check for consistency with a Gaussian distribution. We find that although the error distributions using the weighted mean as well as median estimate are consistent with a Gaussian distribution, the Student’s $t$ and Cauchy distribution provide a better fit. This median statistic estimate of the neutron lifetime from these measurements is given by $881.5 \pm 0.47$ seconds. This can be used as an alternate estimate of the neutron lifetime. We also note that the discrepancy between beam and bottle-based measurements using median statistics of the neutron lifetime persists with a significance between 4 $\sigma$ and 8 $\sigma$, depending on which combination of measurements is used.

Results of Neutron Lifetime Measurements with Gravitational UCN Trap

1991 ◽  
Author(s):  
V. P. Gudkov ◽  
A. G. Kharitonov ◽  
V. V. Nesvizhevsky ◽  
A. P. Serebrov ◽  
S. O. Sumbaev ◽  
...  
Keyword(s):  
Neutron Lifetime ◽  
Lifetime Measurements

Isothermal temperature coefficient measurements and analysis in a heterogeneous thermal reactor system

1993 ◽  
Author(s):  
Gary S. Hoovler ◽  
Russell M. Ball ◽  
Edward J. Parma ◽  
Elizabeth C. Selcow ◽  
Ralph J. Cerbone
Keyword(s):  
Temperature Coefficient ◽  
Reactor System ◽  
Thermal Reactor ◽  
Isothermal Temperature

scholarly journals Neutron’s dark secret

2020 ◽  
Vol 35 (31) ◽  
pp. 2030019
Author(s):  
Bartosz Fornal ◽  
Benjamín Grinstein
Keyword(s):  
Standard Model ◽  
Particle Physics ◽  
Current Status ◽  
Neutron Lifetime ◽  
Dark Sector ◽  
Lifetime Measurements ◽  
The Standard Model ◽  
Dark Decay ◽  
Theoretical Developments

The existing discrepancy between neutron lifetime measurements in bottle and beam experiments has been interpreted as a sign of the neutron decaying to dark particles. We summarize the current status of this proposal, including a discussion of particle physics models involving such a portal between the Standard Model and a baryonic dark sector. We also review further theoretical developments around this idea and elaborate on the prospects for verifying the neutron dark decay hypothesis in current and upcoming experiments.

Experimental Setup for Neutron Lifetime Measurements with a Large Gravitational Trap at Low Temperatures

2019 ◽  
Vol 64 (2) ◽  
pp. 282-286
Author(s):  
A. P. Serebrov ◽  
E. A. Kolomenskii ◽  
A. K. Fomin ◽  
A. O. Koptyukhov ◽  
I. A. Krasnoshchekova ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Experimental Setup ◽  
Neutron Lifetime ◽  
Lifetime Measurements

Problem of the neutron lifetime measurements

JETP Letters ◽  
2010 ◽  
Vol 92 (5) ◽  
pp. 271-275 ◽  
Author(s):  
A. P. Serebrov ◽  
A. K. Fomin
Keyword(s):  
Neutron Lifetime ◽  
Lifetime Measurements
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