Nuclear matrix elements 1 / T 1/2 = PS * NME 2 * (m / m e ) 2 measured quantityquantity of interest The big unknown Started worldwide effort for a coherent.

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Presentation transcript:

Nuclear matrix elements 1 / T 1/2 = PS * NME 2 * (m / m e ) 2 measured quantityquantity of interest The big unknown Started worldwide effort for a coherent program to reduce NME uncertainty down to 30%, summary report available nucl-ex/ Needs international coherent effort

Nuclear matrix elements 1 / T 1/2 = PS * ME 2 * (m / m e ) (A,Z) (A,Z+1) (A,Z+2) 0+0+ charge exchange (p,n), (3He,t) muon capture beta- decays antineutrino- capture nu N scattering Theory: Shopping list what to measure to improve calculations Experiment: Where can it be measured, who? „Ultimate dream“: coherent effort, strategy paper to get things done Q - values charge exchange (n,p), (d,2He) EC/beta+ decays

Phase space   decay rate scales with Q 5  2  decay rate scales with Q 11 Q-value (keV) IsotopeNat. abund. (%) (PS 0v) –1 (yrs eV 2 ) (PS 2v) –1 (yrs) Ca E242.52E16 Ge E257.66E18 Se E242.30E17 Zr E245.19E16 Mo E241.06E17 Pd E252.51E18 Cd E241.25E17 Sn E245.93E17 Te E242.08E17 Xe E242.07E17 Nd E248.41E15

Matrix elements 2 matrix elements determined by intermediate 1 + states 0 matrix elements different

Outcome: Working packages Working package 1: Charge exchange reactions Working package 2: Q-value measurements Working package 3: Muon capture Working package 4: Double elecron capture Working package 5: Neutrino nucleus scattering Working package 6: Nucleon exchange reaction Urgency: Some facilities might vanish in the near future!!!

WP1: Charge exchange Currently: (d, 2 He) and ( 3 He,t) Further: ft-values of EC fixing g_pp EM transitions to IAS nuclear deformation s.r.c.

WP2: Q-values Only 76 Ge known very accurate Atomic traps Reasons: - Good energy resolution detectors - Presence of nearby background lines - Enhancement in EC/EC modes if levels are degenerate

WP3: Ordinary Muon capture

NNR05-Workshop Neutrino nuclear responses in particle and astro nuclear physics -- Double beta decays and low-energy astro neutrinos----- Dec. 1-4, CASTHarima, Osaka Japan Neutrinos involved in  and astro nuclear physics are mostly low- energy( GeV) neutrinos, and accordingly the responses are spin isospin responses with low multi-polarities of L= 0~3. In fact the spin isospin responses for the lowest multi-pole of L=0 have extensively been studied at RCNP, MSU, KVI, TUDA and others. High E-resolution systems there are very powerful.