Abstract
The BETS (balloon-borne electron telescope with scintillating fibers) instrument has been developed for high-altitude balloon flights to observe the cosmic ray electrons with energies of 10 GeV to several 100 GeV. The detector is a Lead/SciFi sampling calorimeter consisting of 36 SciFi belts (each 280 mm wide) and 8 lead plates (each 5 mm thick). The electron identification is performed by triggering the electro-magnetic showers on board and by analyzing the three-dimensional shower images by an intensified CCD camera. It is demonstrated in the flight data in 1995 and 1997 that a reliable identification of the electron component against the proton background is achieved up to a few 100 GeV. The performance of detector was tested by the CERN-SPS electron beams in 1996 and with the proton beams in 1997. The obtained energy spectrum is consistent with the recent observation by HEAT, although our result still has a little room for improvement. The energy spectrum from 10 GeV to 1000 GeV which is obtained by combining these data and the emulsion chamber data ( Nishimura et al. 1997) suggests that the diffusion constant is about 1 × 1028 (E/GeV)0.3 cm2/sec in the energy range between 10 GeV and 1000 GeV. A hump in the energy spectrum is observed around several hundred GeV, which is expected from a nearby source.
| Original language | English |
|---|---|
| Pages (from-to) | 1823-1826 |
| Number of pages | 4 |
| Journal | Advances in Space Research |
| Volume | 26 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 2000 Dec |
| Externally published | Yes |
Fingerprint
ASJC Scopus subject areas
- Space and Planetary Science
- Astronomy and Astrophysics
Cite this
New measurement of the electron flux from 10 gev to 100 gev with the bets instrument. / Torii, S.; Tamura, T.; Tateyama, N.; Yoshida, Kenji; Yamagami, T.; Kamioka, Eiji; Saito, Y.; Murakami, H.; Kobayashi, T.; Komori, Y.; Kasahara, K.; Yuda, T.; Nishimura, J.
In: Advances in Space Research, Vol. 26, No. 11, 12.2000, p. 1823-1826.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - New measurement of the electron flux from 10 gev to 100 gev with the bets instrument
AU - Torii, S.
AU - Tamura, T.
AU - Tateyama, N.
AU - Yoshida, Kenji
AU - Yamagami, T.
AU - Kamioka, Eiji
AU - Saito, Y.
AU - Murakami, H.
AU - Kobayashi, T.
AU - Komori, Y.
AU - Kasahara, K.
AU - Yuda, T.
AU - Nishimura, J.
PY - 2000/12
Y1 - 2000/12
N2 - The BETS (balloon-borne electron telescope with scintillating fibers) instrument has been developed for high-altitude balloon flights to observe the cosmic ray electrons with energies of 10 GeV to several 100 GeV. The detector is a Lead/SciFi sampling calorimeter consisting of 36 SciFi belts (each 280 mm wide) and 8 lead plates (each 5 mm thick). The electron identification is performed by triggering the electro-magnetic showers on board and by analyzing the three-dimensional shower images by an intensified CCD camera. It is demonstrated in the flight data in 1995 and 1997 that a reliable identification of the electron component against the proton background is achieved up to a few 100 GeV. The performance of detector was tested by the CERN-SPS electron beams in 1996 and with the proton beams in 1997. The obtained energy spectrum is consistent with the recent observation by HEAT, although our result still has a little room for improvement. The energy spectrum from 10 GeV to 1000 GeV which is obtained by combining these data and the emulsion chamber data ( Nishimura et al. 1997) suggests that the diffusion constant is about 1 × 1028 (E/GeV)0.3 cm2/sec in the energy range between 10 GeV and 1000 GeV. A hump in the energy spectrum is observed around several hundred GeV, which is expected from a nearby source.
AB - The BETS (balloon-borne electron telescope with scintillating fibers) instrument has been developed for high-altitude balloon flights to observe the cosmic ray electrons with energies of 10 GeV to several 100 GeV. The detector is a Lead/SciFi sampling calorimeter consisting of 36 SciFi belts (each 280 mm wide) and 8 lead plates (each 5 mm thick). The electron identification is performed by triggering the electro-magnetic showers on board and by analyzing the three-dimensional shower images by an intensified CCD camera. It is demonstrated in the flight data in 1995 and 1997 that a reliable identification of the electron component against the proton background is achieved up to a few 100 GeV. The performance of detector was tested by the CERN-SPS electron beams in 1996 and with the proton beams in 1997. The obtained energy spectrum is consistent with the recent observation by HEAT, although our result still has a little room for improvement. The energy spectrum from 10 GeV to 1000 GeV which is obtained by combining these data and the emulsion chamber data ( Nishimura et al. 1997) suggests that the diffusion constant is about 1 × 1028 (E/GeV)0.3 cm2/sec in the energy range between 10 GeV and 1000 GeV. A hump in the energy spectrum is observed around several hundred GeV, which is expected from a nearby source.
UR - http://www.scopus.com/inward/record.url?scp=6644223697&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=6644223697&partnerID=8YFLogxK
U2 - 10.1016/S0273-1177(99)01229-6
DO - 10.1016/S0273-1177(99)01229-6
M3 - Article
VL - 26
SP - 1823
EP - 1826
JO - Advances in Space Research
JF - Advances in Space Research
SN - 0273-1177
IS - 11
ER -