Guido Pizzella Universita di Roma Tor Vergata INFN Frascati

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Guido PizzellaUniversita di Roma Tor
VergataINFN- Frascati
SN1987A revisited
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• May the Supernova Bang more than once ?

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Mont Blanc
Kamiokande
8
0
Hours of 23 February 1987
Mont Blanc 70 candidates/hour gt 5
MeV Kamiokande 150 candidates/hour gt 7.5 MeV
(7.5 MeV corresponds to Nhit20)
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Kamiokande neutrino telescope 1987
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11 ? in 12 s Nhgt21
7 ? in 6 s Nh gt 22
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Mont Blanc neutrino telescope 1987
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No neutrinos gt7.5 MeV
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Correlation with the gravitational wave detectors
GEOGRAV(Rome) and MARYLAND
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Mont Blanc
Kamiokande
8
0
Hours of 23 February 1987
Mont Blanc 70 candidates/hour gt 5
MeV Kamiokande 150 candidates/hour gt 7.5 MeV
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We have searched for possible correlations
between the signals of the neutrino detectors and
those of the g.w. detectors
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The signal
C(f) 1/Nn Si ER(tif ) EM(tif )
Nn number of signals (in the neutrino
detector) in a given
period (say, one hour) ti time of a neutrino
signal f common time shift for a possible delay
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The background
C(f1, f2, f) 1/Nn Si ER(ti f1 f )
EM(ti f2 f )
Nn number of neutrino signals in a given
period (say, one hour) ti time of a neutrino
signal f1, f2 random time shifts for the
background f common time shift for a possible
delay
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One million extractions for background
number
The signal C(0, 0, 1.2)72.6 K
C(f1, f2, f) with f1, f2 ? 0
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Mont Blanc 145 - 345 ( 5-neutrinos at 253
U.T.)
n
Signal larger than one million background
F Dt1.2 (second)
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hours of 23 February
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What about Kamiokande ?

• (absolute time uncertainty 1 min)

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Kamiokande has a time error 1 minute
Kamiokande time correction 7.8 s
Schramm and Truran (1990)
IMB
K
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hours of 23 February
with time correction of 7.8 s
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noi non doviamo desiderare che la natura si
accomodi a quello che parrebbe meglio disposto et
ordinato a noi, ma conviene che noiaccomodiamo
lintelleto nostro a quello che ella ha fatto,
sicuri tale essere lottimo et non
altro.Galileo nel 1612 a Federico Cesi.
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end