by Ballof, J., Seiffert, C., Crepieux, B., Düllmann, Ch. E., Delonca, M., Gai, M., Gottberg, A., Kröll, T., Lica, R., Madurga Flores, M., Martinez Palenzuela, Y., Mendonca, T. M., Owen, M., Ramos, J. P., Rothe, S., Stora, T., Tengblad, O. and Wienholtz, F.
Abstract:
We report on the development and characterization of the first radioactive boron beams produced by the isotope mass separation online (ISOL) technique at CERN-ISOLDE. Despite the long history of the ISOL technique which exploits thick targets, boron beams have up to now not been available. This is due to the low volatility of elemental boron and its high chemical reactivity which make the definition of an appropriate production target unit difficult. In addition, the short half-lives of all boron radioisotopes complicate tracer release studies. We report here on dedicated offline release studies by neutron capture and alpha detection done with implanted 10B in prospective target materials, as well as molecule formation and ionization tests, which suggested the use of multiwalled carbon nanotubes (CNT) as target material and injection of sulfur hexafluoride SF6 to promote volatile boron fluoride formation. Two target units equipped with an arc discharge electron impact ion source VADIS coupled to a water cooled transfer line to retain non-volatile elements and molecules were subsequently tested online. The measured yield of these first 8B ISOL beams increases in the series ${}{textasciicircum}{8}{textbackslash}mathrm{BF}_{3} {textless} {}{textasciicircum}{8}{textbackslash}mathrm{BF} {textless} {}{textasciicircum}{8}{textbackslash}mathrm{B} {textless} {}{textasciicircum}{8}{textbackslash}mathrm{BF}_{2}$, reaching a maximum yield of $ 6.4 {textbackslash}times 10{textasciicircum}{4}$8BF2+ ions per μC of protons.
Reference:
Radioactive boron beams produced by isotope online mass separation at CERN-ISOLDE (Ballof, J., Seiffert, C., Crepieux, B., Düllmann, Ch. E., Delonca, M., Gai, M., Gottberg, A., Kröll, T., Lica, R., Madurga Flores, M., Martinez Palenzuela, Y., Mendonca, T. M., Owen, M., Ramos, J. P., Rothe, S., Stora, T., Tengblad, O. and Wienholtz, F.), In The European Physical Journal A, volume 55, 2019.
Bibtex Entry:
@article{ballof_radioactive_2019,
title = {Radioactive boron beams produced by isotope online mass separation at {CERN}-{ISOLDE}},
volume = {55},
issn = {1434-601X},
url = {https://doi.org/10.1140/epja/i2019-12719-1},
doi = {10.1140/epja/i2019-12719-1},
abstract = {We report on the development and characterization of the first radioactive boron beams produced by the isotope mass separation online (ISOL) technique at CERN-ISOLDE. Despite the long history of the ISOL technique which exploits thick targets, boron beams have up to now not been available. This is due to the low volatility of elemental boron and its high chemical reactivity which make the definition of an appropriate production target unit difficult. In addition, the short half-lives of all boron radioisotopes complicate tracer release studies. We report here on dedicated offline release studies by neutron capture and alpha detection done with implanted 10B in prospective target materials, as well as molecule formation and ionization tests, which suggested the use of multiwalled carbon nanotubes (CNT) as target material and injection of sulfur hexafluoride SF6 to promote volatile boron fluoride formation. Two target units equipped with an arc discharge electron impact ion source VADIS coupled to a water cooled transfer line to retain non-volatile elements and molecules were subsequently tested online. The measured yield of these first 8B ISOL beams increases in the series ${}{textasciicircum}{8}{textbackslash}mathrm{BF}_{3} {textless} {}{textasciicircum}{8}{textbackslash}mathrm{BF} {textless} {}{textasciicircum}{8}{textbackslash}mathrm{B} {textless} {}{textasciicircum}{8}{textbackslash}mathrm{BF}_{2}$, reaching a maximum yield of $ 6.4 {textbackslash}times 10{textasciicircum}{4}$8BF2+ ions per μC of protons.},
language = {en},
number = {5},
urldate = {2021-06-09},
journal = {The European Physical Journal A},
author = {Ballof, J. and Seiffert, C. and Crepieux, B. and Düllmann, Ch. E. and Delonca, M. and Gai, M. and Gottberg, A. and Kröll, T. and Lica, R. and Madurga Flores, M. and Martinez Palenzuela, Y. and Mendonca, T. M. and Owen, M. and Ramos, J. P. and Rothe, S. and Stora, T. and Tengblad, O. and Wienholtz, F.},
month = may,
year = {2019},
note = {No CMAM},
pages = {65},
file = {Springer Full Text PDF:E:\Usuarios\Administrator\Zotero\storage\8CXBZJXG\Ballof et al. - 2019 - Radioactive boron beams produced by isotope online.pdf:application/pdf},
}