Zobrazeno 1 - 10
of 19
pro vyhledávání: '"J. H. Hartley"'
Autor:
Todd Ditmire, Roland Smith, Thomas E. Cowan, G. Hays, Ken Wharton, John K. Crane, Victor Yanovsky, J. H. Hartley, Richard H. Howell, J. Zweiback
Publikováno v:
Physics of Plasmas. 9:3108-3120
Recent experiments on the interaction of intense, ultrafast pulses with large van der Waals bonded clusters have shown that these clusters can explode with sufficient kinetic energy to drive nuclear fusion. Irradiating deuterium clusters with a 35 fs
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8c4e73306d3283cbf484bbed7039114b
https://doi.org/10.1063/1.1487382
https://doi.org/10.1063/1.1487382
Autor:
A Denison, Philip A. Sterne, V Shah, D Akers, Palakkal Asoka-Kumar, J. H. Hartley, Richard H. Howell
Publikováno v:
Acta Materialia. 50:1761-1770
We have directly observed carbon decoration of defects in fatigued 304 stainless steel using positron annihilation spectroscopy. The formation and evolution of defects during fatigue was determined by positron annihilation lifetimes and electron mome
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cfaff6b8d5aac9afc3c08e3539efb8f7
https://doi.org/10.1016/s1359-6454(02)00027-7
https://doi.org/10.1016/s1359-6454(02)00027-7
Autor:
J. H. Hartley, Richard H. Howell, Todd Ditmire, C. A. Steinke, G. Hays, Roland Smith, Thomas E. Cowan, Ken Wharton, John K. Crane, J. Zweiback
Publikováno v:
Physical Review Letters. 85:3640-3643
Exploiting the energetic interaction of intense femtosecond laser pulses with deuterium clusters, it is possible to create conditions in which nuclear fusion results from explosions of these clusters. We have conducted high-resolution neutron time-of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1fc51cbc2983a172f4d5c466de06687e
https://doi.org/10.1103/physrevlett.85.3640
https://doi.org/10.1103/physrevlett.85.3640
Publikováno v:
Scopus-Elsevier
We are developing a defect analysis capability based on two positron beam lifetime spectrometers: the first is based on a 3 MeV electrostatic accelerator and the second on our high current linac beam. The high energy beam lifetime spectrometer is ope
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f3d0c74d83f210f016a215eaf3ac6be2
https://doi.org/10.1016/s0169-4332(96)00965-8
https://doi.org/10.1016/s0169-4332(96)00965-8
Autor:
J. H. Hartley, B. R. Beck, Richard H. Howell, Thomas E. Cowan, Joel Fajans, R. Gopalan, R. R. Rohatgi
Publikováno v:
Hyperfine Interactions. 76:135-142
The development of a high density cryogenic pure positron plasma trap at the LLNL positron beam facility opens new possibilities for antihydrogen research. We discuss a planned measurement of the three-body collisional recombination rate in magnetize
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1c59e4a943b185d2d2045c74e43df3c4
https://doi.org/10.1007/bf02316712
https://doi.org/10.1007/bf02316712
Autor:
Thomas E. Cowan, J. H. Hartley, R. R. Rohatgi, Joel Fajans, J. L. McDonald, Richard H. Howell
Publikováno v:
Materials Science Forum. :529-532
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e89d344adcd8c68ab19c2869a0577005
https://doi.org/10.4028/www.scientific.net/msf.105-110.529
https://doi.org/10.4028/www.scientific.net/msf.105-110.529
Publikováno v:
Applied Physics Letters. 77:1973-1975
We provide direct experimental evidence for a nonrandom distribution of atomic constituents in Zr52.5Ti5Al10Cu17.9Ni14.6 bulk metallic glass using positron annihilation spectroscopy. The Ti content around the open-volume regions is significantly enha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c9fd3ab9ac3a790c7aa0d6081afa16ae
https://doi.org/10.1063/1.1313367
https://doi.org/10.1063/1.1313367
Publikováno v:
Applied Surface Science. 149:204-206
Positron annihilation lifetime measurements were made on well calibrated fatigue samples of SS-304. Measurements were made on a high and low carbon alloy. Two separate lifetimes, indicating two defect site types were resolved in each sample. Signific
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a347bb97efb51a1c9993c7ff8802e6d2
https://doi.org/10.1016/s0169-4332(99)00201-9
https://doi.org/10.1016/s0169-4332(99)00201-9
Publikováno v:
Applied Surface Science. 149:103-105
We have developed a positron lifetime defect analysis capability based on a 3 MeV electrostatic accelerator. The high energy beam lifetime spectrometer is operational with a 100 mCi 22 Na source providing a current of 5.5×105 positrons per second. L
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::920cb9127df6aae6645ba4d5a3f34c99
https://doi.org/10.1016/s0169-4332(99)00181-6
https://doi.org/10.1016/s0169-4332(99)00181-6
Publikováno v:
Materials Science Forum. :644-646
We are developing a low energy, microscopically focused, pulsed positron beam for defect analysis by positron lifetime spectroscopy to provide a new defect analysis capability at the 10{sup 10} e{sup +}s{sup -l} beam at the Lawrence Livermore Nationa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd7c34b8c0321c3a87fb757fb0a81839
https://doi.org/10.4028/www.scientific.net/msf.255-257.644
https://doi.org/10.4028/www.scientific.net/msf.255-257.644