HECRO 81 (High Energy primary Cosmic Ray Observation)

Balloon launched on: 9/30/1981 at 6:53 jst
Launch site: Sanriku Balloon Center, Iwate, Japan  
Balloon launched by: Institute of Space and Astronautical Science (ISAS)
Balloon manufacturer/size/composition: Zero Pressure Balloon model B50 50.000 m3
Flight identification number: B50-19
End of flight (L for landing time, W for last contact, otherwise termination time): 10/1/1981
Balloon flight duration (F: time at float only, otherwise total flight time in d:days / h:hours or m:minutes - ): ~ 30 h

• A large area multitube proportional counter Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 248(2-3) p. 525
• Is There Strange-Quark Matter in Galactic Cosmic Rays? Phys. Rev. Lett. 65, 2094, 1990
• Observation of Cosmic Ray Heavy Nuclei above 5 Gev/n Proceedings from the 18th International Cosmic Ray Conference, held in Bangalore, India, 22 August - 3 September, 1983. Volume 9, p.103
• Observation of High Energy Cosmic Ray Heavy Particles: Results of Observation by HECRO 81 System onboard B 50-17 ISAS Report
• Scientific observations with balloons Institute of Space and Astronautical Science Annual Handbook 1981 (In Japanese)
• Search for Strange Quark Matter in Galactic Cosmic Rays 22nd International Cosmic Ray Conference. 11-23 August, 1991. Dublin, Ireland, 1991., p.742
• Strange quark matter in the cosmic radiation Nuclear Physics B - Proceedings Supplements, Volume 24, Issue 2, December 1991, Pag. 184