L-X-ray production cross-sections for PXAMS: Target and energy dependence for 50-200 MeV hafnium ions

S. Winkler; L. K. Fifield; S. G. Tims; J. Fernandez-Niello

doi:10.1016/j.nimb.2007.01.169

L-X-ray production cross-sections for PXAMS: Target and energy dependence for 50-200 MeV hafnium ions

S. Winkler^*, L. K. Fifield, S. G. Tims, J. Fernandez-Niello

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

In order to detect the long-lived radioisotope ¹⁸²Hf (t_1/2 = 8.9 Ma), a potential supernova isotope signature, we investigated PXAMS as a method of isobar separation for Hf and W. One of the problems of the method is low efficiency. Since there are no reliable quantitative predictions on cross-sections leading to the emission of X-rays from collisions involving fast Hf ions, we determined the energy dependent cross-sections for a number of target elements. A PXAMS system of maximum efficiency was then constructed on the basis of the data obtained. The efficiency of the final setup, defined as the ratio of the number of X-rays detected to the number of incident Hf ions, is 1.2%. The overall efficiency, including negative-ion formation probability and transmission through the accelerator, is 1 × 10^-6.

Original language	English
Pages (from-to)	260-264
Number of pages	5
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	259
Issue number	1
DOIs	https://doi.org/10.1016/j.nimb.2007.01.169
Publication status	Published - Jun 2007

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@article{6c139980ebb84622afa2cd41e2d10ab9,

title = "L-X-ray production cross-sections for PXAMS: Target and energy dependence for 50-200 MeV hafnium ions",

abstract = "In order to detect the long-lived radioisotope 182Hf (t1/2 = 8.9 Ma), a potential supernova isotope signature, we investigated PXAMS as a method of isobar separation for Hf and W. One of the problems of the method is low efficiency. Since there are no reliable quantitative predictions on cross-sections leading to the emission of X-rays from collisions involving fast Hf ions, we determined the energy dependent cross-sections for a number of target elements. A PXAMS system of maximum efficiency was then constructed on the basis of the data obtained. The efficiency of the final setup, defined as the ratio of the number of X-rays detected to the number of incident Hf ions, is 1.2\%. The overall efficiency, including negative-ion formation probability and transmission through the accelerator, is 1 × 10-6.",

keywords = "AMS, Heavy-ion collisions, Hf, PXAMS",

author = "S. Winkler and Fifield, \{L. K.\} and Tims, \{S. G.\} and J. Fernandez-Niello",

year = "2007",

month = jun,

doi = "10.1016/j.nimb.2007.01.169",

language = "English",

volume = "259",

pages = "260--264",

journal = "Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms",

issn = "0168-583X",

publisher = "Elsevier B.V.",

number = "1",

}

L-X-ray production cross-sections for PXAMS: Target and energy dependence for 50-200 MeV hafnium ions. / Winkler, S.; Fifield, L. K.; Tims, S. G. et al.
In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 259, No. 1, 06.2007, p. 260-264.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - L-X-ray production cross-sections for PXAMS

T2 - Target and energy dependence for 50-200 MeV hafnium ions

AU - Winkler, S.

AU - Fifield, L. K.

AU - Tims, S. G.

AU - Fernandez-Niello, J.

PY - 2007/6

Y1 - 2007/6

N2 - In order to detect the long-lived radioisotope 182Hf (t1/2 = 8.9 Ma), a potential supernova isotope signature, we investigated PXAMS as a method of isobar separation for Hf and W. One of the problems of the method is low efficiency. Since there are no reliable quantitative predictions on cross-sections leading to the emission of X-rays from collisions involving fast Hf ions, we determined the energy dependent cross-sections for a number of target elements. A PXAMS system of maximum efficiency was then constructed on the basis of the data obtained. The efficiency of the final setup, defined as the ratio of the number of X-rays detected to the number of incident Hf ions, is 1.2%. The overall efficiency, including negative-ion formation probability and transmission through the accelerator, is 1 × 10-6.

AB - In order to detect the long-lived radioisotope 182Hf (t1/2 = 8.9 Ma), a potential supernova isotope signature, we investigated PXAMS as a method of isobar separation for Hf and W. One of the problems of the method is low efficiency. Since there are no reliable quantitative predictions on cross-sections leading to the emission of X-rays from collisions involving fast Hf ions, we determined the energy dependent cross-sections for a number of target elements. A PXAMS system of maximum efficiency was then constructed on the basis of the data obtained. The efficiency of the final setup, defined as the ratio of the number of X-rays detected to the number of incident Hf ions, is 1.2%. The overall efficiency, including negative-ion formation probability and transmission through the accelerator, is 1 × 10-6.

KW - AMS

KW - Heavy-ion collisions

KW - Hf

KW - PXAMS

UR - https://www.scopus.com/pages/publications/34248216051

U2 - 10.1016/j.nimb.2007.01.169

DO - 10.1016/j.nimb.2007.01.169

M3 - Article

SN - 0168-583X

VL - 259

SP - 260

EP - 264

JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

IS - 1

ER -

L-X-ray production cross-sections for PXAMS: Target and energy dependence for 50-200 MeV hafnium ions

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