SEARCH FOR NEUTRINOLESS COHERENT NUCLEAR CAPTURE OF $mu$$sup -$-MESONS
Journal Article
·
· Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B
OSTI ID:4751878
A high sensitivity experiment to search for the neutrinoless conversion of a muon into an electron ( mu /sup -/ + N = N + e/sup -/, where N is a Cu nucleus) has been carried out at the CERN Synchrocyclotron. The space correlation between the muon and the electron was seen in a spark chamber operated as a target in the muon beam. The time correlation was observed on an oscilloscope trace which also contained the pulse from a large NaI(Tl) crystal, used to measure the energy of the electron (103.8 Mev in the case of the above mentioned process occurring coherently in the Cu plates of the chamber). Nearly 2.4 billion mu /sup -/-mesons were stopped during the main run. From the scanning of the film of the chamber (two 90 deg stereo-views) and of the corresponding oscilloscope pictures obtained in this run, four events were found fuifilling all requirements of time correlation, space correlation, and correct energy release in the NaI counter. It is shown, however, that approximates 5 plus or minus 2 is the expected number of events of spurious nature. Hence, if the neutrinoless coherent nuclear capture of a meson exists at all, its branching ratio to the ordinary capture is concluded to be less than 2.2 x 10/sup -7/ with 90% confidence level. This negative result fits into the recent discovery of two kinds of neutrinos. (auth)
- Research Organization:
- Universita, Rome; INFN, Rome; and CERN, Geneva
- NSA Number:
- NSA-17-005377
- OSTI ID:
- 4751878
- Journal Information:
- Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B, Journal Name: Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B Vol. Vol: (10), 26; ISSN NUCIA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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