Zobrazeno 1 - 10
of 51
pro vyhledávání: '"Hansjakob Hofmann"'
Autor:
Hansjakob Hofmann, H.-J. Lange, K. Bremer, Martin Suter, Rainer Wieler, S. Vogt, Rolf Michel, U. Herpers
Publikováno v:
Planetary and Space Science. 43:545-556
The cosmogenic radionuclides 10Be, 26Al and 53Mn and stable He-, Ne- and Ar-isotopes were measured in differentiated meteorites from Antarctica using accelerator mass spectrometry, γ-γ-coincidence techniques, radiochemical neutron activation analys
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::afb26d5c523d5781720c681ff14f963c
https://doi.org/10.1016/0032-0633(94)00191-s
https://doi.org/10.1016/0032-0633(94)00191-s
Autor:
Hansjakob Hofmann, T. Hahn, H.-J. Lange, Willy Wolfli, P. W. Kubik, Beate Dittrich-Hannen, Marc J.-F. Suter, U. Herpers, Rolf Michel, Th. Schiekel, R. Rösel
Publikováno v:
Applied Radiation and Isotopes. 46:93-112
In order to provide thin-target cross sections as a basis for model calculations of the interactions of solar and galactic α-particles, irradiation experiments with α-particles were performed at the injector cyclotron at PSI/Villigen ( E max = 119.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1e4e41577289c5c9ab6760df9964b516
https://doi.org/10.1016/0969-8043(94)00124-i
https://doi.org/10.1016/0969-8043(94)00124-i
Autor:
Ulrich Siegenthaler, Urs Baltensperger, Margit Schwikowski, D.T. Jost, D Wagenbach, J. Beer, Heinz W. Gäggeler, Hans-Arno Synal, Hansjakob Hofmann
Publikováno v:
Atmospheric Environment. Part A. General Topics. 27:1881-1890
Simultaneous aerosol and snow sampling was performed during a field campaign at the Alpine site Weissfluhjoch Davos, Switzerland (2540 m a.s.1.) from 1 January through 30 March 1988. In addition, a snow pit was sampled on 30 March 1988. Very good agr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::efeb161be29e7017634d78090ed11020
https://doi.org/10.1016/0960-1686(93)90293-8
https://doi.org/10.1016/0960-1686(93)90293-8
Autor:
P. Malmborg, Marc J.-F. Suter, R. Bodemann, Rolf Michel, B. Holmqvist, H. Condé, B. Dittrich, U. Herpers, Ingo Leya, Hansjakob Hofmann, Th. Schiekel, R. Rösel, H.-J. Lange, Willy Wolfli
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 82:9-31
Cross sections for the production of residual nuclides by p-induced reactions are the basic nuclear quantities for an accurate modelling of the interaction of solar cosmic protons with matter. In a series of irradiation experiments at the cyclotron o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eb399bc2ad5b9671a8ae1b4474d5d1c0
https://doi.org/10.1016/0168-583x(93)95077-i
https://doi.org/10.1016/0168-583x(93)95077-i
Autor:
R. Bodemann, Narendra Bhandari, Hansjakob Hofmann, K. Bremer, H.-J. Lange, M. N. Rao, K. J. Mathew, S. Vogt, U. Herpers, Rolf Michel, Willy Wolfli
Publikováno v:
Geochimica et Cosmochimica Acta. 57:2361-2375
Depth profiles of the cosmogenic isotopes 3He, 20e, 21Ne, 22Ne, 10Be and 26A1 have been measured by conventional and accelerator mass spectrometry in the chondrites Madhipura, Udaipur, and Bansur. Shielding depths of the samples and meteorite sizes w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5aff9ac07a6bf162364849b730c32cee
https://doi.org/10.1016/0016-7037(93)90574-g
https://doi.org/10.1016/0016-7037(93)90574-g
Publikováno v:
Geochimica et Cosmochimica Acta. 57:205-217
Measurements of 230Th, 231Pa, and 10Be in sediment trap samples and Holocene sediments collected along a transect in the northeastern Pacific indicate that the removal of these nuclides from the ocean is greatly influenced by boundary scavenging. Mor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::97437bfe885c829fb3596ebcba930381
https://doi.org/10.1016/0016-7037(93)90479-g
https://doi.org/10.1016/0016-7037(93)90479-g
Autor:
Y. Lao, Susan E. Trumbore, Hansjakob Hofmann, Robert F. Anderson, Willy Wolfli, Wallace S. Broecker
Publikováno v:
Earth and Planetary Science Letters. 113:173-189
An ocean-wide study of the rates of removal of10Be and231Pa in the Pacific Ocean has identified intensified scavenging of the10Be and231Pa in several ocean margin areas, including the Northeastern and Northwestern Pacific, the Bering Sea, the Eastern
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::879b6f83981b550917a07ec514d366d1
https://doi.org/10.1016/0012-821x(92)90218-k
https://doi.org/10.1016/0012-821x(92)90218-k
Autor:
H.-A. Synal, R. C. Finkel, Hansjakob Hofmann, Mario Burger, Urs Krähenbühl, J. Beer, Willy Wolfli, Th. Michel, Otto Eugster
Publikováno v:
Geochimica et Cosmochimica Acta. 55:3139-3148
Noble gas isotopes, radionuclides, and chemical abundances were studied in the lunar meteorites MAC88104 and MAC88105 collected in the MacAlpine Hills area of Antarctica. The concentrations of the noble gas isotopes and the radionuclide activities in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c3ad93621a91ff51bda11a7fa554f9ed
https://doi.org/10.1016/0016-7037(91)90478-n
https://doi.org/10.1016/0016-7037(91)90478-n
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 52:544-551
The half-life of Si has been redetermined. A value of 133±9 yr was obtained from different Si-samples produced by proton activation of 37 Cl (as LiCl) and neutron activation of 31 P (as Mg 2 P 2 O 7 ). After chemical separation, purification and con
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e65018bd2e3d236aca0e9e40c87b7cb3
https://doi.org/10.1016/0168-583x(90)90474-9
https://doi.org/10.1016/0168-583x(90)90474-9
Autor:
P. Dragovitsch, Detlef Filges, Rolf Michel, B. Dittrich, Hansjakob Hofmann, M. Lüpke, Willy Wolfli, U. Herpers, R. Bodemann
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 52:588-594
In order to determine thin-target cross sections for the proton-induced prduction of residual nuclides from cosmochemically relevant target elements (Z≤28), irradiation experiments were carried out with energies between 100 and 2600 MeV at various
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::555e2c7541d2d7f426902f8f7eb63974
https://doi.org/10.1016/0168-583x(90)90481-9
https://doi.org/10.1016/0168-583x(90)90481-9