New limits on nucleon decays into invisible channels with the BOREXINO counting test facility

被引：45

作者：

Back, HO

Balata, M

de Bari, A

Beau, T

de Bellefon, A

Bellini, G

Benziger, J

Bonetti, S

Buck, C

Caccianiga, B

Cadonati, L

Calaprice, F

Cecchet, G

Chen, M

Di Credico, A

Dadoun, O

D'Angelo, D

Denisov, VY

Derbin, A

Deutsch, M

Elisei, F

Etenko, A

von Feilitzsch, F

Fernholz, R

Ford, R

Franco, D

Freudiger, B

Galbiati, C

Gatti, F

Gazzana, S

Giammarchi, MG

Giugni, D

Goeger-Neff, M

Goretti, A

Grieb, C

Hagner, C

Heusser, G

Ianni, A

Ianni, AM

de Kerret, H

Kiko, J

Kirsten, T

Kobychev, V

Korga, G

Korschinek, G

Kozlov, Y

Kryn, D

Laubenstein, M

Litvinovich, E

Lendvai, C

机构：

[1] LNGS SS, I-67010 Assergi, AQ, Italy

[2] Univ Pavia, Dipartimento Fis Nucl & Teor, I-27100 Pavia, Italy

[3] Lab Phys Corpusculaire & Cosmol, F-75231 Paris 05, France

[4] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[5] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

[6] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany

[7] Queens Univ, Dept Phys, Kingston, ON K7L 3N6, Canada

[8] Tech Univ Munich, D-85747 Garching, Germany

[9] Joint Inst Nucl Res, Dubna 141980, Russia

[10] MIT, Dept Phys, Cambridge, MA 02139 USA

[11] Univ Perugia, Dipartimento Chim, I-06123 Perugia, Italy

[12] RRC Kurchatov Inst, Moscow 123182, Russia

[13] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy

[14] Ist Nazl Fis Nucl, I-16146 Genoa, Italy

[15] KFKI, RMKI, H-1121 Budapest, Hungary

[16] Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA

[17] Jagiellonian Univ, M Smoluchowski Inst Phys, PL-30059 Krakow, Poland

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

[19] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA

来源：

PHYSICS LETTERS B | 2003年 / 563卷 / 1-2期

关键词：

proton decay; Baryon number conservation; scintillation detector;

D O I：

10.1016/S0370-2693(03)00636-1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The results of background measurements with the second version of the BOREXINO Counting Test Facility (CTF-II), installed in the Gran Sasso Underground Laboratory, were used to obtain limits on the instability of nucleons, bounded in nuclei, for decays into invisible channels (inv): disappearance, decays to neutrinos, etc. The approach consisted of a search for decays of unstable nuclides resulting from N and NN decays of parent C-12, C-13 and O-16 nuclei in the liquid scintillator and the water shield of the CTF Due to the extremely low background and the large mass (4.2 t) of the CTF detector, the most stringent (or competitive) up-to-date experimental bounds have been established: tau(n --> inv) > 1.8 x 10(25) yr, tau(p --> inv) > 1.1 x 10(26) yr, tau(nn --> inv) > 4.9 x 10(25) yr and tau(pp --> inv) > 5.0 x 10(25) yr, all at 90% C.L. (C) 2003 Published by Elsevier Science B.V.

引用

页码：23 / 34

页数：12

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