Search for long-lived superheavy eka-tungsten with radiopure ZnWO4 crystal scintillator

被引：13

作者：

Belli, P. ^{[1
]}

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

Cappella, F. ^{[3
]}

Cerulli, R. ^{[3
]}

Danevich, F. A. ^{[4
]}

Denisov, V. Yu ^{[4
]}

d'Angelo, A. ^{[5
]}

Incicchitti, A. ^{[5
]}

Kobychev, V. V. ^{[4
]}

Poda, D. V. ^{[4
,6
]}

Polischuk, O. G. ^{[4
,5
]}

Tretyak, V. I. ^{[4
,5
]}

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, Lab Nazl Gran Sasso, I-67100 Assergi, AQ, Italy

[4] MSP, Inst Nucl Res, UA-03680 Kiev, Ukraine

[5] Ist Nazl Fis Nucl, Sez Roma La Sapienza, I-00185 Rome, Italy

[6] Ctr Sci Nucl & Sci Mat, F-91405 Orsay, France

来源：

PHYSICA SCRIPTA | 2015年 / 90卷 / 08期

关键词：

superheavy elements; ZnWO4 crystal scintillator; low background experiment; SPONTANEOUS FISSION; NUCLEAR-MASSES; HALF-LIVES; ELEMENTS; HEAVY; DECAY; DISCOVERY; EXISTENCE; ISOTOPES; SHELLS;

D O I：

10.1088/0031-8949/90/8/085301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The data collected with a radioactively pure ZnWO4 crystal scintillator (699 g) in low background measurements during 2130 h at the underground (3600 m w.e.) Laboratori Nazionali del Gran Sasso (INFN, Italy) were used to set a limit on possible concentration of superheavy eka-W (seaborgium Sg, Z = 106) in the crystal. Assuming that one of the daughters in a chain of decays of the initial Sg nucleus decays with emission of high energy a particle (Q(alpha) > 8 MeV) and analyzing the high energy part of the measured alpha spectrum, the limit N(Sg)/N(W) <5.5 x 10(-14) atoms/atom at 90% C.L. was obtained (for Sg half-life of 10(9) yr). In addition, a limit on the concentration of eka-Bi was set by analysing the data collected with a large BGO scintillation bolometer in an experiment performed by another group (Cardani et al 2012 JINST 7 P10022): N(eka-Bi)/N(Bi)<1.1 x 10(-13) atoms/atom with 90% C.L. Both the limits are comparable with those obtained in recent experiments which instead look for spontaneous fission of superheavy elements or use the accelerator mass spectrometry.

引用

页数：6

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