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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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slide1

LEVEL SCHEMES

of the

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

  • Suspect limit due to Pb salt colloids possibly

due to reaction with dissolved gases

  • Need to understand chemistry better

measurements in progress

SPECTRAL TRANSMISSION THROUGH A

1 CM CELL OF 80% Pb4(ClO4)2 (UNPURIFIED)

REFERENCED TO H2O

LEAD

CERENKOV

DETECTOR?

  • No Obvious Features
  • Scattering or Absorption?

s units

10-40 cm2

INDEX OF REFRACTION AS A FUNCTION

OF SOLUTION CONCENTRATION

n capture time

~10-100 ms.

  • Expect about 185 /cm
  • Stopping Power

0.2 cm/MeV (80%)

0.33 cm/MeV (50%)

  • 15 MeV electron

~550  (80%)

~920  (50%)

FHM: Fuller, Haxton, McLaughlin, PR D59, 085005 (1999)

KL: Kolbe, Langanke, preprint Nucl-th\0003060

APPLICATIONS

SUPERNOVA OBSERVATORY

 PHYSICS, OSCILLATIONS

Supernova Spectra

Cross Section

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.

Approximately thermal.

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.

6.27 MeV

2.76 MeV

Conclusions

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.

Spectral Features

Ratio for 2-n/1-n Events

NC events produce little energy in coincidence

with neutrons.

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.

Oscillations

Decay at Rest

Look for 29.8-MeV

ne coming early in time.

tp = 26 ns

tm = 2200 ns