Nuclear matrix elements 1 / T 1/2 = PS * NME 2 * (m / m e ) 2 easured quantity quantity of interest The big unknown rted worldwide effort for a coherent gram to reduce NME uncertainty n to 30%, summary report available l-ex/0511009 s international coherent effort ://www.ippp.dur.ac.uk/0NU2B/2005.html
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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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Nuclear matrix elements
1 / T1/2 = PS * NME2 * (m / me)2
measured quantity quantity of interest
The big unknownStarted worldwide effort for a coherentprogram to reduce NME uncertainty down to 30%, summary report availablenucl-ex/0511009
Needs international coherent efforthttp://www.ippp.dur.ac.uk/0NU2B/2005.html
Matrix elements2 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 exchangeCurrently: (d,2He) and (3He,t)
Further:ft-values of EC fixing g_ppEM transitions to IASnuclear deformations.r.c.
WP2: Q-valuesOnly 76Ge 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(0.01-0.1 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.