Search for double beta decay of 136Ce and 138Ce with HPGe gamma detector

Belli, P.; Bernabei, R.; Boiko, R. S.; Cappella, F.; Cerulli, R.; Danevich, F.A.; Incicchitti, A.; Kropivyansky, B. N.; Laubenstein, M.; Poda, D.V.; Polischuk, O. G.; Tretyak, V. I.

doi:10.1016/j.nuclphysa.2014.08.072

Cited by 28 publications

(20 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The remaining aqueous solution of ytterbium nitrate was acidified to pH ∼ 1 and purified by the liquid-liquid extraction technique. The liquidliquid extraction method has been proven to be the most effective technique for the purification of lanthanides from uranium and thorium traces [34,35,8]. A solution of 0.1 M tri-n-octylphosphine oxide (TOPO, 99%, Acros Organics) diluted in toluene (≤ 99.7%, ACS reagent, Sigma-Aldrich) has been used as non-polar organic phase for the extraction of U and Th from the polar aqueous solution.…”

Section: Elementmentioning

confidence: 99%

First search for 2ε and εβ+ processes in 168Yb

Belli¹,

Bernabei

Boiko

et al. 2019

Nuclear Physics A

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Elementmentioning

confidence: 99%

First search for 2ε and εβ+ processes in 168Yb

Belli¹,

Bernabei

Boiko

et al. 2019

Nuclear Physics A

Self Cite

View full text Add to dashboard Cite

show abstract

“…This process is expected to have a longer life-time and accompanied by a photon that carries away the decay energy. However, a possible enhancement of the capture rate by a factor as large as 10 6 can occur if the masses of the initial and final (excited) nucleus are degenerate [2], and hence this nuclear decay process is also attracting attention both theoretically [3,4,5,6] and experimentally [7,8,9,10,11]. Moreover, neutrinoless positron-emitting electron capture (0νβ + EC) and neutrinoless double beta plus decay (0νβ + β + ) may occur in the same nucleus depending on the mass difference between the initial and final nuclei.…”

Section: Introductionmentioning

confidence: 99%

Search for two-neutrino double electron capture on 124Xe with the XMASS-I detector

et al. 2016

View full text Add to dashboard Cite

Double electron capture is a rare nuclear decay process in which two orbital electrons are captured simultaneously in the same nucleus. Measurement of its two-neutrino mode would provide a new reference for the calculation of nuclear matrix elements whereas observation of its neutrinoless mode would demonstrate lepton number violation. A search for two-neutrino double electron capture on 124 Xe is performed using 165.9 days of data collected with the XMASS-I liquid xenon detector. No significant excess above background was observed and we set a lower limit on the half-life as 4.7 × 10 21 years at 90% confidence level. The obtained limit has ruled out parts of some theoretical expectations. We obtain a lower limit on the 126 Xe two-neutrino double electron capture half-life of 4.3 × 10 21 years at 90% confidence level as well.

show abstract

“…respectively, [62] are good candidates for 2β decay; competitive experimental results are reported in Ref. [156,157,64,158,159,160]. Moreover, the 142 Ce isotope can decay to the ground state of 138 Ba with emission of an α particle.…”

Section: Ce α Decaymentioning

confidence: 99%

“…Deviations from the theoretical shape could be used to limit (or to measure) the neutrino mass [256,257], however, taking into account the high T 1/2 and the low Q * β , such measurements will be extremely difficult. There are also other nuclides which are candidates for the lowest Q * β value in their decays to excited levels of daughter nuclei: 77 As, 79 Kr, 109 In, 111 In, 115 Cd, 131 I, 135 Cs, 146 Pm, 149 Gd, 155 Eu, 159 Dy, 161 Ho, 188 W, and 189 Ir [264,265,266,267] (see also the recent review [169] and an additional list of candidates in [268]); these decays are not observed yet and their Q β values are known currently with a low accuracy ( 1 keV or worse). Precise measurements of the atomic mass differences and possibly of the energies of the excited levels are needed in all these cases.…”

Section: CD β Decaymentioning

confidence: 99%

Experimental searches for rare alpha and beta decays

et al. 2019

Self Cite

View full text Add to dashboard Cite

The current status of the experimental searches for rare alpha and beta decays is reviewed. Several interesting observations of alpha and beta decays, previously unseen due to their large half-lives (10 15 − 10 20 yr), have been achieved during the last years thanks to the improvements in the experimental techniques and to the underground locations of experiments that allows to suppress backgrounds. In particular, the list includes first observations of alpha decays of 151 Eu, 180 W (both to the ground state of the daughter nuclei), 190 Pt (to excited state of the daughter nucleus), 209 Bi (to the ground and excited states of the daughter nucleus). The isotope 209 Bi has the longest known half-life of T 1/2 ≈ 10 19 yr relatively to alpha decay. The beta decay of 115 In to the first excited state of 115 Sn (Eexc = 497.334 keV), recently observed for the first time, has the Q β value of only (147 ± 10) eV, which is the lowest Q β value known to-date. Searches and investigations of other rare alpha and beta decays ( 48 Ca, 50 V, 96 Zr, 113 Cd, 123 Te, 178m2 Hf, 180m Ta and others) are also discussed.

show abstract

Search for double beta decay of 136Ce and 138Ce with HPGe gamma detector

Cited by 28 publications

References 43 publications

First search for 2ε and εβ+ processes in 168Yb

First search for 2ε and εβ+ processes in 168Yb

Search for two-neutrino double electron capture on 124Xe with the XMASS-I detector

Experimental searches for rare alpha and beta decays

Contact Info

Product

Resources

About