P
P. L. Walstrom
Researcher at Los Alamos National Laboratory
Publications - 27
Citations - 577
P. L. Walstrom is an academic researcher from Los Alamos National Laboratory. The author has contributed to research in topics: Neutron & Ultracold neutrons. The author has an hindex of 9, co-authored 26 publications receiving 469 citations.
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Journal ArticleDOI
Measurement of the Neutron Lifetime Using a Magneto-Gravitational Trap and in Situ Detection
Robert W. Pattie,N. B. Callahan,C. Cude-Woods,C. Cude-Woods,E. Adamek,Leah Broussard,S. M. Clayton,Scott Currie,E. B. Dees,X. Ding,Egbert M. Engel,D. E. Fellers,W. Fox,Peter Geltenbort,Kevin Hickerson,Mark A. Hoffbauer,A. T. Holley,A. Komives,Chen Liu,S. W. T. MacDonald,Mark Makela,Christopher Morris,Joseph D. Ortiz,John Ramsey,D. J. Salvat,Alexander Saunders,S. J. Seestrom,E. I. Sharapov,S. K. L. Sjue,Z. Tang,J. Vanderwerp,Bruce Vogelaar,P. L. Walstrom,Zhehui Wang,Wei Wei,H. L. Weaver,J. Wexler,Tanner L. Womack,A. R. Young,B. A. Zeck,B. A. Zeck +40 more
TL;DR: The lifetime of the neutron lifetime was measured in a trap where ultracold polarized neutrons were levitated by magnetic fields, precluding interactions with the trap walls, to aid the understanding of how the first nuclei formed after the Big Bang.
Proton radiography
Gary E. Hogan,Kenneth Adams,K.R. Alrick,James F. Amann,J.G. Boissevain,M.L. Crow,S.B. Cushing,J.C. Eddelman,C. Espinoza,T.T. Fife,Robert A. Gallegos,J.J. Gomez,T.J. Gorman,N.T. Gray,V. H. Holmes,Steven A. Jaramillo,N.S.P. King,J. N. Knudson,R.K. London,R. P. Lopez,J.B. McClelland,Frank E. Merrill,K. B. Morley,Christopher Morris,C. T. Mottershead,K.L. Mueller,F.A. Neri,D.M. Numkena,Peter Pazuchanics,C. Pillai,R.E. Prael,C. M. Riedel,J. S. Sarracino,Alexander Saunders,H. L. Stacy,B.E. Takala,H.A. Thiessen,H.E. Tucker,P. L. Walstrom,George J. Yates,Hans-Joachim Ziock,J. D. Zumbro,E. Ables,Maurice B. Aufderheide,Peter D. Barnes,R. M. Bionta,D. Fujino,E. P. Hartouni,H.-S. Park,R. A. Soltz,Douglas Wright,S. Balzer,Paul Flores,R.T. Thompson,A. Pendzick,R. Prigl,J. Scaduto,E.T. Schwaner,John M. O'Donnell +58 more
TL;DR: Proton Radiography has high penetrating power, high detection efficiency, small-scattered background, inherent multi-pulse capability, and large standoff distances between test objects and detectors.
Journal ArticleDOI
Measurement of the neutron lifetime using an asymmetric magneto- gravitational trap and in situ detection
Robert W. Pattie,A. T. Holley,H. L. Weaver,John Ramsey,Chen-Yu Liu,X. Ding,E. M. Engel,Mark A. Hoffbauer,A. R. Young,Bruce Vogelaar,E. I. Sharapov,Z. Tang,E. B. Dees,Mark Makela,Leah Broussard,B. A. Zeck,J. Vanderwerp,T. L. Womack,Alexander Saunders,E. Adamek,Wanchun Wei,D. E. Fellers,N. B. Callahan,C. Cude-Woods,W. Fox,Steven Clayton,J. Wexler,A. Komives,Kevin Hickerson,S. J. Seestrom,Jose Ortiz,Zhehui Wang,Christopher Morris,Scott Currie,S. W. T. MacDonald,D. J. Salvat,P. L. Walstrom,Sky Sjue +37 more
TL;DR: In this paper, the lifetime of neutrons was measured by levitating polarized ultracold neutrons above the surface of an asymmetric storage trap using a repulsive magnetic field gradient so that the stored neutrons do not interact with material trap walls.
Journal ArticleDOI
Improved Neutron Lifetime Measurement with UCNτ.
F. Gonzalez,F. Gonzalez,Eric Fries,C. Cude-Woods,C. Cude-Woods,T. Bailey,T. Bailey,M. Blatnik,Leah Broussard,N. B. Callahan,J. H. Choi,J. H. Choi,Steven Clayton,Scott Currie,M. Dawid,E. B. Dees,E. B. Dees,B. W. Filippone,W. Fox,P. Geltenbort,E. George,L. Hayen,L. Hayen,Kevin Hickerson,Mark A. Hoffbauer,K. Hoffman,A. T. Holley,Takeyasu M. Ito,A. Komives,C.-Y. Liu,Mark Makela,Christopher Morris,R. Musedinovic,R. Musedinovic,Christopher O'Shaughnessy,R. W. Pattie,John Michael Ramsey,D.J. Salvat,Alexander Saunders,Alexander Saunders,E. I. Sharapov,S. Slutsky,V. Su,X. Sun,C. Swank,Zhaowen Tang,W. Uhrich,J. Vanderwerp,P. L. Walstrom,Zhehui Wang,Wanchun Wei,A. R. Young,A. R. Young,mi> τ<,mrow +54 more
TL;DR: In this paper, the authors report an improved measurement of the free neutron lifetime τ n using the UCNτ apparatus at the Los Alamos Neutron Science Center and find a value τ n =877.75±0.28{stat}+0.22/-0.16{syst}
Journal ArticleDOI
A magneto-gravitational trap for absolute measurement of the ultra-cold neutron lifetime
TL;DR: In this article, a conceptual design for an experiment to measure the neutron lifetime with a relative accuracy of 10 − 4 is presented, which is performed by observing the decay rate of a sample of ultra-cold neutrons (UCN) confined in vacuum in a magneto-gravitational trap.