scholarly journals Measurement of the free neutron lifetime using the neutron spectrometer on NASA's Lunar Prospector mission

2021 ◽  
Vol 104 (4) ◽  
Author(s):  
Jack T. Wilson ◽  
David J. Lawrence ◽  
Patrick N. Peplowski ◽  
Vincent R. Eke ◽  
Jacob A. Kegerreis
Keyword(s):  
Neutron Lifetime ◽  
Neutron Spectrometer ◽  
Free Neutron ◽  
Lunar Prospector

scholarly journals Space-based measurement of the neutron lifetime using data from the neutron spectrometer on NASA's MESSENGER mission

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Jack T. Wilson ◽  
David J. Lawrence ◽  
Patrick N. Peplowski ◽  
Vincent R. Eke ◽  
Jacob A. Kegerreis
Keyword(s):  
Neutron Lifetime ◽  
Neutron Spectrometer ◽  
Using Data

scholarly journals Measurements of the Neutron Lifetime

Atoms ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 70 ◽  
Author(s):  
F. Wietfeldt
Keyword(s):  
Nuclear Physics ◽  
Neutron Decay ◽  
Neutron Lifetime ◽  
The Past ◽  
Free Neutron ◽  
Mean Lifetime ◽  
Fundamental Process ◽  
Beam Method ◽  
The Subject ◽  
Particle Decays

Free neutron decay is a fundamental process in particle and nuclear physics. It is the prototype for nuclear beta decay and other semileptonic weak particle decays. Neutron decay played a key role in the formation of light elements in the early universe. The precise value of the neutron mean lifetime, about 15 min, has been the subject of many experiments over the past 70 years. The two main experimental methods, the beam method and the ultracold neutron storage method, give average values of the neutron lifetime that currently differ by 8.7 s (4 standard deviations), a serious discrepancy. The physics of neutron decay, implications of the neutron lifetime, previous and recent experimental measurements, and prospects for the future are reviewed.

scholarly journals Lunar rare earth element distribution and ramifications for FeO and TiO2: Lunar Prospector neutron spectrometer observations

2000 ◽  
Vol 105 (E8) ◽  
pp. 20333-20345 ◽  
Author(s):  
R. C. Elphic ◽  
D. J. Lawrence ◽  
W. C. Feldman ◽  
B. L. Barraclough ◽  
S. Maurice ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Element Distribution ◽  
Neutron Spectrometer ◽  
Lunar Prospector ◽  
Rare Earth Element Distribution

scholarly journals On the Free Neutron Decay with Neutrino(s) Interactions

2019 ◽  
Author(s):  
Muhammad Ali
Keyword(s):  
Beta Decay ◽  
Cross Sections ◽  
Neutron Decay ◽  
Mathematical Framework ◽  
Neutron Lifetime ◽  
Discrete Energy ◽  
Neutron Beta Decay ◽  
Inverse Beta Decay ◽  
Free Neutron ◽  
Reactor Neutrinos

This paper proposes a mechanism for the decay of free neutron with interactions with neutrino(s). A mathematical framework is developed using canonical ensemble framework for the interactions. Probability distribution of neutron discrete energy states has been derived which is a function of neutrino-zeta – a macroscopic property of neutrinos. Consequently, a relationship between neutron decay constant and probability of neutron beta decay is provided, assuming linear proportionality. Furthermore, qualitative explanation of neutron lifetime puzzle, where discrepancy in lifetime measurements based on measurement method (Bottle vs Beam), is related to neutrino microscopic cross-sections. In addition, inverse beta-decay reaction of proton and beta-negative and beta-positive reaction of radionuclides have been analyzed using the proposed mechanism. The probabilities of beta-negative and beta-positive reactions in nature are qualitatively in agreement with the proposed mechanism. Lastly, way to test the mechanism experimentally with reactor neutrinos and neutrino beams has been presented.

scholarly journals Improved modeling of Lunar Prospector neutron spectrometer data: Implications for hydrogen deposits at the lunar poles

2006 ◽  
Vol 111 (E8) ◽  
Author(s):  
David J. Lawrence ◽  
W. C. Feldman ◽  
R. C. Elphic ◽  
J. J. Hagerty ◽  
S. Maurice ◽  
...  
Keyword(s):  
Neutron Spectrometer ◽  
Lunar Prospector ◽  
Spectrometer Data

Analysis of Lunar Prospector Data to Constrain the Neutron Lifetime

2018 ◽  
Author(s):  
Daniel David Schechtman Coupland ◽  
Katherine Elizabeth Mesick ◽  
Caleb Daniel Roecker
Keyword(s):  
Neutron Lifetime ◽  
Lunar Prospector

scholarly journals New Neutron Lifetime Measurements with the Big Gravitational Trap and Review of Neutron Lifetime Data

KnE Energy ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 121 ◽  
Author(s):  
A P Serebrov ◽  
E A Kolomensky ◽  
A K Fomin ◽  
I A Krasnoschekova ◽  
A V Vassiljev ◽  
...  
Keyword(s):  
Weak Interaction ◽  
Storage Time ◽  
Collision Frequency ◽  
Experimental Setup ◽  
Lifetime Data ◽  
Neutron Lifetime ◽  
Lifetime Measurements ◽  
Primordial Nucleosynthesis ◽  
Free Neutron ◽  
The Stability

Neutron lifetime is one of the most important physical constants which determines parameters of the weak interaction and predictions of primordial nucleosynthesis theory. In our experiment we measure the storage time of UCN in the material trap coated with a hydrogen-free fluorine-containing polymer (Fomblin grease UT-18). The stability of this coating to multiple thermal cycles between 80 K and 300 K was tested. The achieved storage time is only 1.5% less than free neutron lifetime. Using additional surface, which can be plunged into the trap to change the collision frequency of UCN with walls, we calculate free neutron lifetime by extrapolation to zero collision frequency. The result of the measurements with this new experimental setup is

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