New limits on 2β processes in 106Cd

14th International Conference on Topics in Astroparticle and Underground Physics

物理学;天文学

Tretyak, V.I.^1,2 ; Belli, P.^3 ; Bernabei, R.^3,4 ; Brudanin, V.B.^5 ; Cappella, F.^6 ; Caracciolo, V.^6 ; Cerulli, R.^6 ; Chernyak, D.M.^1 ; Danevich, F.A.^1 ; D'Angelo, S.^3,4 ; Di Marco, A.^4 ; Incicchitti, A.^2,7 ; Laubenstein, M.^6 ; Mokina, V.M.^1 ; Poda, D.V.^1,8 ; Polischuk, O.G.^1,2 ; Tupitsyna, I.A.^9

Institute for Nuclear Research, MSP, Kyiv

03680, Ukraine^1

INFN, Sezione di Roma, Rome

I-06285, Italy^2

INFN, Sezione di Roma Tor Vergata, Rome

I-06233, Italy^3

Dipartimento di Fisica, Università di Roma Tor Vergata, Rome

I-06233, Italy^4

Joint Institute for Nuclear Research, Dubna

141980, Russia^5

INFN, Laboratori Nazionali Del Gran Sasso, Assergi (AQ)

I-67100, Italy^6

Dipartimento di Fisica, Università di Roma la Sapienza, Rome

I-06285, Italy^7

Centre de Sciences Nucléaires et de Sciences de la Matière, Orsay

91405, France^8

Institute of Scintillation Materials, Kharkiv

61062, Ukraine^9

关键词: Cadmium tungstate;    Decay process;    Double electron capture;    Electron capture;    Gran Sasso National Laboratory;    HPGe detectors;    Positron emission;    Ultra low backgrounds;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/718/6/062062/pdf
DOI  :  10.1088/1742-6596/718/6/062062

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

A radiopure cadmium tungstate crystal scintillator, enriched in106Cd to 66%, with mass of 216 g (106CdWO4) was used in coincidence with four ultra-low background HPGe detectors contained in a single cryostat to search for double beta (2β) decay processes in106Cd. New improved half-life limits on the 2β processes in106Cd have been set on the level of 1020- 1021yr after 13085 h of data taking deep underground (3600 m w.e.) at the Gran Sasso National Laboratories of INFN (Italy). In particular, the limit on the two neutrino electron capture with positron emission, Tβ+21/2≥ 1.1 × 1021yr, has reached the region of theoretical predictions. The resonant neutrinoless double electron captures to the 2718, 2741 and 2748 keV excited states of106Pd are restricted on the level of T20v1/2≥ (8.5 × 1020- 1.4 × 1021) yr.