Investigation of rare nuclear decays with BaF2 crystal scintillator contaminated by radium

被引：19

作者：

Belli, P. ^{[1
]}

Bernabei, R. ^{[1
,2
]}

Cappella, F. ^{[3
,4
]}

Caracciolo, V. ^{[5
]}

Cerulli, R. ^{[5
]}

Danevich, F. A. ^{[6
]}

Di Marco, A. ^{[2
]}

Incicchitti, A. ^{[3
]}

Poda, D. V. ^{[6
]}

Polischuk, O. G. ^{[3
,6
]}

Tretyak, V. I. ^{[3
,6
]}

机构：

[1] Ist Nazl Fis Nucl, Sez Roma Tor Vergata, I-00133 Rome, Italy

[2] Univ Roma Tor Vergata, Dipartimento Fis, I-00133 Rome, Italy

[3] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy

[4] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[5] Ist Nazl Fis Nucl, Lab Nazl Gran Sasso, I-67100 Assergi, AQ, Italy

[6] Inst Nucl Res, UA-03680 Kiev, Ukraine

来源：

EUROPEAN PHYSICAL JOURNAL A | 2014年 / 50卷 / 09期

关键词：

DOUBLE-BETA DECAY; DATA SHEETS; DETECTOR; SEARCH; TABLES;

D O I：

10.1140/epja/i2014-14134-6

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The radioactive contamination of a BaF2 scintillation crystal with mass of 1.714 kg was measured over 101 hours in the low-background DAMA/R&D set-up deep underground (3600 m w.e.) at the Gran Sasso National Laboratories of INFN (LNGS, Italy). The half-life of Po-212 (present in the crystal scintillator due to contamination by radium) was measured as = 298.8 +/- 0.8(stat.)+/- 1.4(syst.) ns by the analysis of the events' pulse profiles. The Rn-222 nuclide is known as 100% decaying via the emission of the particle with T (1/2) = 3.82 d; however, its decay is also energetically allowed with keV. Search for decay chains of events with specific pulse shapes characteristic for or for signals and with known energies and time differences allowed us to set, for the first time, the limit on the branching ratio of Rn-222 relatively to decay as % at 90% C.L. (equivalent to limit on partial half-life y). The half-life limits of Pb-212, Rn-222 and Ra-226 relatively to 2 decays are also improved in comparison with the earlier results.

引用

页码：1 / 9

页数：9

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