150Nd Analysis

Kiyotaka Yamazaki

150Nd Analysis –The Story So Far

924.7 days of data was analysed by Nasim Fatemi-Ghomi (PhD Thesis, 2009)

Chris Jackson has analysed up to 1402.1 days of data (PhD Thesis, 2010)

Now, the aim is to complete the analysis on the full set of the data and get the precise statistical error.

Background analysis -1e1γ channel

Five components to be analyzed with this channel

208Tl, 228Ac, 207Bi, 152Eu and 154Eu

Set one component to be a signal S and others to be backgrounds with the activity measured by Chris (Thesis 2010)

Background analysis -1e1γ channel

Phase 1 Phase 2

Energy Sum

Energy ofElectron

Background analysis -1e1γ channel

Feed back the result to plot new graphs

But…

Nasim FATEMI-GHOMI thesis 2009

A(208Tl)= 0.47±0.05 mBq

924.7days

1402.1days in Total

A(208Tl)= 1.25±0.1 mBq

Background analysis -1e1γ channel

Different TDC FAST cut on swire background model makes difference

t220, t0V. Kovalenko Dubna December 2007Irreducible systematic error??

2e channel

T1/2=(9.03±0.04)×1018 years

Plans

• Updated rootana is installed.• Data up to 2010, reconstructed by

Stefano and being transferred to Manchester

• Use 1e, 1e2γ channel to get the full set of the background activities.