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Almahata Sitta meteorite: gamma-activity measurements at Monte dei Cappuccini Laboratory in Torino

Taricco, Carla and Bhandari, Narendra and Colombetti, Paolo and Romero, Alberto and Vivaldo, Gianna and Sinha, Neeharika and Jenniskens, Peter and Shaddad, Muawia H. Almahata Sitta meteorite: gamma-activity measurements at Monte dei Cappuccini Laboratory in Torino. Memorie della Società Astronomica Italiana, Suppl. (19). pp. 402-405. ISSN 1824-016X (2012)

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Abstract

The asteroid 2008 TC3 was telescopically seen prior to entering Earth’s atmosphere and was predicted to fall in Sudan on October 7, 2008, as it actually happened. Subsequently, many fragments were collected from the Nubian desert. At Monte dei Cappuccini Laboratory (IFSI, INAF) in Torino, using a selective gamma spectrometer we measured gamma rays from fragment #15, one of the largest retrieved, a ureilite of mass 75 g. Six cosmogenic radionuclides have been measured (46Sc, 57Co, 54Mn, 22Na, 60Co and 26Al). 60Co and 26Al activities allowed us to deduce that the fragment was located at a depth of 41�14 cm inside the 1.5–2m radius asteroid. Moreover, 22Na activity is slightly greater than expected on the basis of the average cosmic ray flux and this could be ascribed to the prolonged solar minimum preceding the meteorite fall.

Item Type: Article
Uncontrolled Keywords: Meteoroids – Cosmic rays – Sun: activity – Sun: magnetic fields – Techniques: gamma spectroscopy – Sunspots – Interplanetary medium – Solar-terrestrial relations
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Research Area: Economics and Institutional Change
Depositing User: Gianna Vivaldo
Date Deposited: 10 Nov 2014 13:34
Last Modified: 25 Mar 2015 09:16
URI: http://eprints.imtlucca.it/id/eprint/2361

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