We need 150 Nd for the 0 experiment 1 2 = G 0 M 0 m 2 SuperNEMO - - PowerPoint PPT Presentation

Isotope Qββ (MeV) G0ν (y-1)

Shell Model 2.44 9.2 1026 7 1027 9.6 1026 3.6 1026 5.2 1026 0.24 1.08 2.24 1.75 1.89 1.70 1.81

8.00

QRPA

48Ca

4.271 2.9 1027

76Ge

2.040 2.4 1027

82Se

2.995 7.4 1026

96Zr

3.350 1.5 1028

100Mo

3.034 1.4 1027

116Cd

2.802 1027

130Te

2.528 1027

136Xe

2.479 2-5 1027 150Nd

3.367 1.2 1026

T1/2(0ν) with mν=50meV

Shell Model: Caurier et al. QRPA: Feasller Rodin Simkovic Vogel 2005

We need 150Nd for the ββ0ν experiment

= G0ν M0ν ‹mν›2

2 0ν

T1/2 1

SuperNEMO SNO++ DCBA etc.

Qββ

150Nd

Beyond the γ of 2.614 MeV(208Tl) Beyond 214Bi Qβ ( 3.2 MeV)

• Possibility to produce 150Nd with laser enrichment method (use MENPHIS) under study.
• S. Jullian (LAL, Orsay, Organizer of the Project), here only presentation by H.Ohsumi

150 150Nd production: The Laser Method (AVLIS)

Nd production: The Laser Method (AVLIS)

AVLIS: Atomic Vapor Laser Isotope Separation

Vaporized isotope mixture Laser beam Enriched U collecting plate Depleted U collecting plate

Selective photoionization based on : isotope shifts in the atomic absorption optical spectra U + 3 selective photons → 235U+ + e-

~0.01nm difference

Vapor plume (U nat) Vapor plume (U nat) Product collectors Product collectors Waste collector Waste collector

Copper Vapor pump Lasers and YAG oscillators Beam shaping with closed loop (steering, centering, wavefront) Beam transport Dye lasers (oscillators - Amplifiers) Beam folding system

light-vapor interaction volume light-vapor interaction volume depleted U collector depleted U collector electron beam gun electron beam gun water cooled crucible water cooled crucible reflux reflux feed stream feed stream enriched U stream enriched U stream enriched U collectors enriched U collectors depleted U stream depleted U stream

Side View

Evaporator Dye laser chain Yag laser Copper vapor lase

2000 2000 – – 2003 Program: MENPHIS Facility 2003 Program: MENPHIS Facility

• Production of 200 kg of enriched U at 2.5 % in few

days

• Results in agreement with simulation expectation

Design : 2001 Building : 2002 1st test : early 2003 1st full scale exp. : june 2003

MENPHIS simulation shows that enrichment of 150Nd is doable (ton scale), ~ 100 kg in few weeks !!!

48Ca enrichment is theoriticaly doable. Studies must be done

Expression of Interest of SuperNEMO, SNO++ and Japan to keep MENPHYS for Nd enrichment

LASER :

• ≥ 600 hours for each CVL
• 170 hours for dye laser at full power

SEPARATOR :

• Several hundred hours at the operational

temperature and extractor voltage without significant failures nor material damages

• Long time evaporation

Menphis experiment technological results

MENPHIS (2000–2003 Program): CONCLUSIONS Many countries have demonstrated with AVLIS a g/h production of low enriched uranium But only a few have been able to raise the production up to a few kg/hour (USA, Japon, France) To get such a production level : 20 years : high power electron gun high laser power Nd has been enriched in 150Nd at 60% with a production yield of 40mg/h

(Kurchatov Institute QE 35(10), 879 (2005)