LEVEL SCHEMES of the 208 Pb 208 Bi System. LEAD PERCHLORATE AS A NEUTRINO DETECTION MEDIUM STEVEN ELLIOTT, PETER DOE, HAMISH ROBERTSON, TOM STEIGER, JOHN WILKERSON. UNIVERSITY OF WSHINGTON, SEATTLE. THE NUCLEAR PHYSICS OF LEAD. PROPERTIES OF A LEAD PERCHLORATE SOLUTIONS.
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208Pb 208Bi System
LEAD PERCHLORATE AS A NEUTRINO DETECTION MEDIUM
STEVEN ELLIOTT, PETER DOE, HAMISH ROBERTSON, TOM STEIGER, JOHN WILKERSON. UNIVERSITY OF WSHINGTON, SEATTLE
THE NUCLEAR PHYSICS OF LEAD
PROPERTIES OF A LEAD PERCHLORATE SOLUTIONS
ATTENUATION LENGTH OF 430 nm LIGHT
IN 80% Pb4(ClO4)2 (UNPURIFIED)
CROSS SECTION COMPARISON
NEUTRON CAPTURE TIME IN 80 % Pb(ClO4)2
due to reaction with dissolved gases
measurements in progress
SPECTRAL TRANSMISSION THROUGH A
1 CM CELL OF 80% Pb4(ClO4)2 (UNPURIFIED)
REFERENCED TO H2O
INDEX OF REFRACTION AS A FUNCTION
OF SOLUTION CONCENTRATION
n capture time
0.2 cm/MeV (80%)
0.33 cm/MeV (50%)
FHM: Fuller, Haxton, McLaughlin, PR D59, 085005 (1999)
KL: Kolbe, Langanke, preprint Nucl-th\0003060
Need to Measure s
The cross section is strongly dependent on Te
FHM indicates uncertainty of 50%.
KL and FHM differ by large amounts.
Decay at Rest (DAR) m from stopped p+ decay has spectrum similar to supernova, but with no anti-ne.
A DAR m measurement in Pb(ClO4)2 studies the Pb reaction, without interference from the well known H reaction.
A 10 t detector could measure the cross section to 10% or so in a few months at proposed ORLaND facility.
Absolute temperature scales are somewhat uncertain.
Relative temperature scales are not: there is a hierarchy, Te < Tanti-e < Tm,t.
Observation of Te > Tanti-e would be indicative of n oscillations.
Measuring not just the total number of
neutrons but the number of events with
1 or 2 neutrons is very powerful.
Measuring the electron energy
in coincidence with the neutrons permits
separation of NC and CC interactions.
Pb(ClO4)2 has the potential to make these
measurements because it is sensitive
to charged particles, gammas and neutrons.
Ratio for 2-n/1-n Events
NC events produce little energy in coincidence
The CC-events will have electron energy in
coincidence with neutrons.
The CC electron energy can be sorted as to
how many neutrons were in coincidence.
In coinc., 2-n events are almost all due to ne.
In coinc., 1-n events are due to ne and anti- ne.
This ratio is very
sensitive to Te.
Decay at Rest
Look for 29.8-MeV
ne coming early in time.
tp = 26 ns
tm = 2200 ns