Excited State Transitions in Double Beta Decay: A brief Review
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1 Excited State Transitions in Double Beta Decay: A brief Review Fifteenth International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics (CGS15) Dresden 26/08/2014 Björn Lehnert Institut für Kern- und Teilchenphysik
2 Double Beta Decay Mass Parabola 2 :(Z, A)! (Z +2,A)+2e +2 e 0 :(Z, A)! (Z +2,A)+2e Ge76: 2039 kev Effective neutrino mass: (only for dominant light Majorana neutrino exchange) arxiv: v2 (2009) CGS15, 26/08/14 Bjoern Lehnert Excited States DBD 2
3 DBD into Excited States 2 : 0 : T 2 1/2 T 0 1/2 1 = G 2 M = G 0 M 0 2 m ee 2 Experimental information for 2νββ helps matrix element calculations for 0νββ expected to have highest excited state rate ( E 11 (for 2ν), spin suppressed) Effective parameters can be constrained: (e.g. g A quenching) CGS15, 26/08/14 Bjoern Lehnert Excited States DBD 3
4 Experimental Approaches Gamma spectroscopy Theoretical Approaches Direct calculation HPGe sample HPGe sample HPGe Direct calculation with various nuclear models (QRPA, SM, HFB, IBM...) Often very inconsistent 0νββ experiments Scaling to ground state T 1/2 Use ratio of NME and PSF which cancels some uncertainties (e.g. ga) Then scale with measured g.s. T1/2 CGS15, 26/08/14 Bjoern Lehnert Excited States DBD 4
5 Excited States Experimental Overview So far 2νββ transition discovered in 100 Mo (1995) and 150 Nd (2004) 2002 full collection of DBD information: Tretyak and Zdesenko, Atom. Data Nucl. Data Tabl., vol. 80, pp excited states: Barabash, arxiv: v1 [nucl-ex] 2010 combination of DBD results: Barabash, Phys. Rev. C, vol. 81, p Scaling with g.s. T1/2 and full set of PSF and NME Phys. Rev. C85, (2012) Phys. Rev. C87, (2013) CGS15, 26/08/14 Bjoern Lehnert Excited States DBD 5
6 Excited States Experimental Overview So far 2νββ transition discovered in 100 Mo (1995) and 150 Nd (2004) 2002 full collection of DBD information: Tretyak and Zdesenko, Atom. Data Nucl. Data Tabl., vol. 80, pp excited states: Barabash, arxiv: v1 [nucl-ex] 2010 combination of DBD results: Barabash, Phys. Rev. C, vol. 81, p Scaling with g.s. T1/2 and full set of PSF and NME Phys. Rev. C85, (2012) Phys. Rev. C87, (2013) CGS15, 26/08/14 Bjoern Lehnert Excited States DBD 6
7 100 Mo Gammas: kev and kev [1] First discovered in 1995 by Barabash et al.: Phys. Lett. B, vol. 345, pp (1995) [2] Latest measurement by NEMO-3 Collaboration: Nucl. Phys. A, vol. 925, pp (2014) [2] 2.6 kg of enriched metallic 100 Mo 600 cm 3 HPGe detector 3.3% 540 kev Exp [2]: T1/2 = 7.5± yr QRPA: T1/2 = ( ) yr IBM-2: T1/2 = yr CGS15, 26/08/14 Bjoern Lehnert Excited States DBD 7
8 150 Nd Gammas: kev and kev [1] First discovered in 2004 by Barabash et al.: JETP Lett., vol. 79, pp (2004) [2] Latest measurement by Barabash et al.: Phys. Rev. C, vol. 79, no. 4, p (2009) [2] 3 kg of natural Nd 2 O 3 (153 g 150 Nd) HPGe: 2.3% 334 kev [2]: T1/2 = yr IBM-2: T1/2 = yr [2] CGS15, 26/08/14 Bjoern Lehnert Excited States DBD 8
9 CUORICINO: 130 Te EXO-200: 136 Xe ϵ=0.5% ϵ=3.0% single site multi site ϵ=1.3% Future CUORE 19 towers x 13 floors 11.3 kg of TeO2 bolometers ɣ: 536 kev and 1257 kev; β <734 kev 80 kg liquid enriched Xe TPC Complicated analysis without segmentation T1/2 > yr [Phys. Rev. C (2012)] ɣ: 761 kev and 819 kev; β: <879 kev QRPA: T1/2 = ( ) yr IBM-2: T1/2 = yr CGS15, 26/08/14 Bjoern Lehnert Excited States DBD T1/2 > yr [PhD Thesis Yung-Ruey Yen (2013)] IBM-2: T1/2 = yr 9
10 Excited States in GERDA Phase I CGS15, 26/08/14 Bjoern Lehnert Excited States DBD 10
11 Excited States in GERDA Phase I Signal MC Single detector Background MC Sum detector CGS15, 26/08/14 Bjoern Lehnert Excited States DBD 11
12 Excited States in GERDA Phase I Single detector spectra used for analysis Cut flow in 4 levels: 0. Standard cuts: Quality cuts and muon-veto 1. Coincidence cuts: Any of the 2 detectors has any de-excitation gamma energy +-2 sigma 2. Background cuts: Exclusion of background gamma lines 3. Pair cuts: Choose detector pairs that maximize sensitivity Sum detector spectrum after coincidence cut GERDA sensitivity > yr Exp (0 + 1): T 1/2 > yr Many old predictions < yr New (RQRPA): T1/2 = yr IBM-2: T1/2 = yr Work in progress... CGS15, 26/08/14 Bjoern Lehnert Excited States DBD 12
13 Palladium: 110 Pd and 102 Pd 110 Pd: & kev 102 Pd: & kev 110 Pd: 2νβ - β - nat abundance: % Q-value kev PRL 108, (2012) Only measurement for g.s. (1952) 102 Pd: 2νECEC, 2νECβ + nat abundance: 1.02 % Q-value: 1172 kev No previous measurement Idea: Measure sample with HPGe ɣ-spectroscopy in low background env. Use only ɣ-lines from excited state transitions as experimental signatures Not sensitive to g.s. transitions; No separation between 2νββ and 0νββ CGS15, 26/08/14 Bjoern Lehnert Excited States DBD 13
14 Three Palladium Measurements 1 cm x 1 cm The Palladium world tour: 1. Felsenkeller (Dresden, Germany) 2. HADES (Mol, Belgium) 3. LNGS (L Aquila, Italy) 800 g Applied Radiation and Isotopes 61 (2004) CGS15, 26/08/14 Bjoern Lehnert Excited States DBD 14
15 First 110 Pd and 102 Pd Limits Felsenkeller: Phys. Lett. B (2011) HADES: Phys. Rev. C 87, (2013) LNGS: in preparation First excited state limits for 110 Pd (0 + 1): T1/2 > yr QRPA: T1/2 = (4-9) yr IBM-2: T1/2 > yr (no ground state measured) CGS15, 26/08/14 Bjoern Lehnert Excited States DBD 15
16 Conclusions Excited states in 2νββ DBD helps 0νββ NME calculations New generation 0νββ DBD will soon discover more 2νββ transitions New result in 136 Xe (EXO-200) and 130 Te (CUORICINO) Analysis with 76 Ge (GERDA Phase I) in preparation New first limits for 110 Pd and 102 Pd 21 CGS15, 26/08/14 Bjoern Lehnert Excited States DBD 16
17 BACKUP
18 Angular Correlations
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