Characteristics of the copolymerized CR-39/DAP track detector for the observation of ultra heavy nuclei in galactic cosmic rays

S. Kodaira; N. Yasuda; H. Kawashima; M. Kurano; Nobuyuki Hasebe; T. Doke; S. Ota; T. Tsuruta; H. Hasegawa; S. Sakai; T. Nishi; K. Ogura

doi:10.1016/j.radmeas.2009.10.050

Characteristics of the copolymerized CR-39/DAP track detector for the observation of ultra heavy nuclei in galactic cosmic rays

S. Kodaira^*, N. Yasuda, H. Kawashima, M. Kurano, Nobuyuki Hasebe, T. Doke, S. Ota, T. Tsuruta, H. Hasegawa, S. Sakai, T. Nishi, K. Ogura

^*Corresponding author for this work

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

4 Citations (Scopus)

Abstract

A new copolymer of CR-39 and DAP resin was developed for the selective detection of ultra heavy nuclei in galactic cosmic rays. The track registration sensitivity for heavy ions with various Z^*/β was verified for copolymers mixing CR-39 (BARYOTRAK) with various concentrations of DAP using heavy ion beams at the HIMAC accelerator. In order to realize sufficient polymerization of CR-39/DAP copolymer, the optimum fabricating method was also verified by modifying the concentration of the initiator and temperature-time curing cycle for the copolymerization. CR-39 (BARYOTRAK) used for the base material of copolymerization has many advantages: 1) high uniformity of detector response, 2) extremely clear surface condition after etching, and 3) excellent charge and mass resolutions for heavy ions. The surface condition of the copolymer after etching is remarkably improved by using the BARYOTRAK monomer and its track registration sensitivity is controllable by changing the DAP concentration. However the detection threshold of the CR-39 (BARYOTRAK)/DAP copolymer is not yet satisfactory.

Original language	English
Pages (from-to)	775-778
Number of pages	4
Journal	Radiation Measurements
Volume	44
Issue number	9-10
DOIs	https://doi.org/10.1016/j.radmeas.2009.10.050
Publication status	Published - 2009 Oct

Keywords

CR-39/DAP (diallyl phthalate) copolymer
Detection threshold
Galactic cosmic rays
Track detector
Ultra heavy nuclei

ASJC Scopus subject areas

Radiation
Instrumentation

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10.1016/j.radmeas.2009.10.050

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title = "Characteristics of the copolymerized CR-39/DAP track detector for the observation of ultra heavy nuclei in galactic cosmic rays",

abstract = "A new copolymer of CR-39 and DAP resin was developed for the selective detection of ultra heavy nuclei in galactic cosmic rays. The track registration sensitivity for heavy ions with various Z*/β was verified for copolymers mixing CR-39 (BARYOTRAK) with various concentrations of DAP using heavy ion beams at the HIMAC accelerator. In order to realize sufficient polymerization of CR-39/DAP copolymer, the optimum fabricating method was also verified by modifying the concentration of the initiator and temperature-time curing cycle for the copolymerization. CR-39 (BARYOTRAK) used for the base material of copolymerization has many advantages: 1) high uniformity of detector response, 2) extremely clear surface condition after etching, and 3) excellent charge and mass resolutions for heavy ions. The surface condition of the copolymer after etching is remarkably improved by using the BARYOTRAK monomer and its track registration sensitivity is controllable by changing the DAP concentration. However the detection threshold of the CR-39 (BARYOTRAK)/DAP copolymer is not yet satisfactory.",

keywords = "CR-39/DAP (diallyl phthalate) copolymer, Detection threshold, Galactic cosmic rays, Track detector, Ultra heavy nuclei",

author = "S. Kodaira and N. Yasuda and H. Kawashima and M. Kurano and Nobuyuki Hasebe and T. Doke and S. Ota and T. Tsuruta and H. Hasegawa and S. Sakai and T. Nishi and K. Ogura",

year = "2009",

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language = "English",

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AU - Kodaira, S.

AU - Yasuda, N.

AU - Kawashima, H.

AU - Kurano, M.

AU - Hasebe, Nobuyuki

AU - Doke, T.

AU - Ota, S.

AU - Tsuruta, T.

AU - Hasegawa, H.

AU - Sakai, S.

AU - Nishi, T.

AU - Ogura, K.

PY - 2009/10

Y1 - 2009/10

N2 - A new copolymer of CR-39 and DAP resin was developed for the selective detection of ultra heavy nuclei in galactic cosmic rays. The track registration sensitivity for heavy ions with various Z*/β was verified for copolymers mixing CR-39 (BARYOTRAK) with various concentrations of DAP using heavy ion beams at the HIMAC accelerator. In order to realize sufficient polymerization of CR-39/DAP copolymer, the optimum fabricating method was also verified by modifying the concentration of the initiator and temperature-time curing cycle for the copolymerization. CR-39 (BARYOTRAK) used for the base material of copolymerization has many advantages: 1) high uniformity of detector response, 2) extremely clear surface condition after etching, and 3) excellent charge and mass resolutions for heavy ions. The surface condition of the copolymer after etching is remarkably improved by using the BARYOTRAK monomer and its track registration sensitivity is controllable by changing the DAP concentration. However the detection threshold of the CR-39 (BARYOTRAK)/DAP copolymer is not yet satisfactory.

AB - A new copolymer of CR-39 and DAP resin was developed for the selective detection of ultra heavy nuclei in galactic cosmic rays. The track registration sensitivity for heavy ions with various Z*/β was verified for copolymers mixing CR-39 (BARYOTRAK) with various concentrations of DAP using heavy ion beams at the HIMAC accelerator. In order to realize sufficient polymerization of CR-39/DAP copolymer, the optimum fabricating method was also verified by modifying the concentration of the initiator and temperature-time curing cycle for the copolymerization. CR-39 (BARYOTRAK) used for the base material of copolymerization has many advantages: 1) high uniformity of detector response, 2) extremely clear surface condition after etching, and 3) excellent charge and mass resolutions for heavy ions. The surface condition of the copolymer after etching is remarkably improved by using the BARYOTRAK monomer and its track registration sensitivity is controllable by changing the DAP concentration. However the detection threshold of the CR-39 (BARYOTRAK)/DAP copolymer is not yet satisfactory.

KW - CR-39/DAP (diallyl phthalate) copolymer

KW - Detection threshold

KW - Galactic cosmic rays

KW - Track detector

KW - Ultra heavy nuclei

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Characteristics of the copolymerized CR-39/DAP track detector for the observation of ultra heavy nuclei in galactic cosmic rays

Abstract

Keywords

ASJC Scopus subject areas

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