Neutrino and Dark Matter Detections via Atomic Ionizations at sub-kev Sensitivities
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1 Neutrino and Dark Matter Detections via Atomic Ionizations at sub-kev Sensitivities Chih-Pan Wu Dept. of Physics, National Taiwan University Collaborators: Jiunn-Wei Chen, Chih-Liang Wu (NTU) Chen-Pang Liu, Hsin-Chang Chi (NDHU) Henry T. Wong (Academia Sinica & TEXONO) 1
2 Direct Dark Matter Detection Cryogenic detector experiments pure Ge, Si targets operating at very low temperatures CDMS, CDEX, CRESST, EURECA, Noble liquid experiments detect the flash of scintillation light produced by a particle collision in liquid Xe or Ar PANDAX, XENON, ZEPLIN, DEAP, ArDM, WARP, LUX, 2
3 Neutrino EM properties nonzero millicharge exists anomalous magnetic moment exists Finite neutrino masses and mixings Chirality Charge quantization Dirac or Majorana CP phase n i W l g n j 3
4 ν Ge Atomic Ionization (AI) 4
5 Two channels for ν Ge Scattering Neutrino Magnetic Moment Neutrino Millicharge 5
6 6 TEXONO Kuo-Sheng Nuclear Power Station in Taiwan Neutrino Magnetic Moment Neutrino Millicharge
7 Experimental Limit Neutrino Magnetic Moment (NMM) Neutrino Millicharge 7
8 Ab initio MCRRPA Theory for Atomic Ionization MCRRPA: multiconfiguration relativistic random phase approximation Hartree-Fock : RPA: RRPA: MCRRPA: Solve self consistently by reducing the N-body system to single-particle problem by effective mean field Include particle-hole excitation diagram D. Bohm and D. Pines (1952) Describe heavy noble gas (Dirac Eq.) W.R. Johnson, C.D. Lin and A. Dalgarno (1976) More than one configuration. Important for open shell system, like Ge, where energy gap < closed shell K.-N. Huang and W.R. Johnson (1982) 8
9 Atomic Ionization by Dark Matters Assuming some processes for interactions between DM and atoms, then we can make some constraints through the direct detection. For example: exchanging a massive boson. Note the WIMP scattering is the most kinematics-sensitive case, and both FEA & EPA fails badly. 1 GeV and 50 MeV mass light DM are examined in short and long interaction. 9
10 F 1 : g 10
11 F 2 : n q n 11
12 Short range interaction: exchanging Higgs-like gauge boson. Long range interaction: exchanging photon-like boson. 12
13 Other Interesting Topics Other Ionization Process for Detectors: Besides the interactions mentioned above, there are many possibilities like producing light or heat for a more complex detector. Sterile Neutrino: A candidate of light DM, probably can oscillate to ordinary neutrinos. Other Neutrino Sources: Tritium beta decay, Low energy solar neutrinos 13
14 Reference: J.-W. Chen et al., Phys. Lett. B 731, 159, arxiv: (2014). J.-W. Chen et al., Phys. Rev. D 90, (R), arxiv: (2014). J.-W. Chen, C.-P. Liu, C.-F. Liu, and C.-L. Wu, Phys. Rev. D 88, (2013). P. Vogel and J. Engel, Phys. Rev. D 39, 3378 (1989). K.-N. Huang and W. R. Johnson, Phys. Rev. A 25, 634 (1982). [MCRRPA Theory] J. Beringer et al., Phys. Rev. D 86, (2012). [PDG] H. T. Wong et al., Phys. Rev. D 75, (2007). [TEXONO] A. G. Beda et al., Phys. Part. Nucl. Lett. 10, 139 (2013). [GEMMA] H.-B. Li et al., Phys. Rev. Lett. 110, (2013). [TEXONO-PPCGe] B. L. Henke, E.M. Gullikson, and J.C. Davis, At. Data Nucl. Data Tables 54, 181 (1993). Thanks for your attention! 14
15 BACKUP SLIDES 15
16 Two Approximations --- I Equivalent Photon Approx. 16
17 Two Approximations --- II Free Electron Approx. 17
18 Toy: ν-h atomic ionization, exact result obtained Equivalent Photon Approx. binding momentum of hydrogen: αm e Free Electron Approx. 18
19 Ab initio MCRRPA Theory for Atomic Ionization MCRRPA: multiconfiguration relativistic random phase approximation Hartree-Fock : RPA: RRPA: MCRRPA: Solve self consistently by reducing the N-body system to single-particle problem by effective mean field Include 2 particle 2 hole excitation D. Bohm and D. Pines (1952) Describe heavy noble gas (Dirac Eq.) W.R. Johnson, C.D. Lin and A. Dalgarno (1976) More than one configuration. Important for open shell system, where energy gap < closed shell K.-N. Huang and W.R. Johnson (1982) 19
20 H ( t) H V( t) Hamiltonian of an Electron + Atomic Coulomb interaction Time-dependent interaction it it V ( t) [ n ( r ) e n ( r ) e ] I i i u a ( r, t) (t) is a Slater determinant of one-electron orbitals and invoke variational principle ( t) i H VI ( t) ( t) 0 t to obtain equations for u a ( r, t). RPA: Expand u a ( r, t) i t a i t i t u ( r, t) e [ u ( r) w ( r) e w ( r) e...] a into time-indep. orbitals in power of external potential a a a i MCRRPA: Approximate the many-body wave function (t) by a superposition of configuration functions (t) ( t) C ( t) ( t) 20
21 21 MCRRPA Equations Normalization Slater determinant time-dependent external perturbation: Multipole expansion Transition amplitude:
22 Atomic Structure of Ge For J=1, λ=1 Selection Rules: Angular Momentum Selection Rule: Parity Selection Rule: 22
23 Benchmark: Ge Photoionization Exp. data: Ge solid Theory: Ge atom (gas) Above 80 ev error under 5%. 23
24 ν Ge Atomic Ionization (AI) 24
25 ν Ge Kinematic Function 25
26 ν Ge Response Function 26
27 Numerical Results: Weak Interaction Ev e 1MeV Ev e 10 kev cutoff : T Max E 2E v e 2 v e m e 0.38 kev High E ν & T, ours agreed with FEA. 27
28 Numerical Results: NMM Ev e 10 kev Ev e 1MeV EPA failed at High E ν. Ours is ~50% smaller than FEA at sub-kev. 28
29 Numerical Results: Millicharge Ev e 10 kev Ev e 1MeV mv e 0.2 ev EPA worked well due to kinematic factors of F 1 form factor receive a strong weight at peripheral scattering angles. 29
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