The Majorana 76Ge double-beta decay project

被引：4
|
作者：
Aalseth, CE [1 ]
Adles, E
Anderson, D
Avignone, FT
Barabash, A
Bowyer, TW
Brodzinski, RL
Brudanin, V
Champangne, A
Collar, JI
Doe, PJ
Egorov, S
Elliott, SR
Farach, HA
Gaitskell, R
Jordan, D
Jain, RK
Kazkaz, K
King, G
Kochetov, O
Konovalov, S
Kouzes, R
Miley, HS
Palms, JM
Pitts, WK
Reeves, JH
Robertson, RGH
Rohm, R
Sandukovsky, S
Smith, LE
Stekhanov, V
Thompson, RC
Tornow, W
Umatov, V
Warner, R
Webb, J
Wilkerson, JF
Young, A
机构：
[1] Pacific NW Natl Lab, Richland, WA 99352 USA
[2] N Carolina State Univ, Raleigh, NC USA
[3] Triangle Univ Nucl Lab, Durham, NC 27706 USA
[4] Univ S Carolina, Columbia, SC 29208 USA
[5] Inst Theoret & Expt Phys, Moscow 117259, Russia
[6] Joint Inst Nucl Res, Dubna, Russia
[7] Duke Univ, Durham, NC USA
[8] Univ Chicago, Chicago, IL 60637 USA
[9] Univ Washington, Seattle, WA 98195 USA
[10] Brown Univ, Providence, RI 02912 USA
[11] New Mexico State Univ, Las Cruces, NM 88003 USA
来源：
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2003年 / 124卷
关键词：
D O I：
10.1016/S0920-5632(03)02116-9
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
The interest and relevance of next-generation 0(nu) betabeta-decay experiments is increasing. Even with nonzero neutrino mass strongly suggested by solar and atmospheric neutrino experiments sensitive to deltam(2), 0(nu) betabeta-decay experiments are still the only way to establish the Dirac or Majorana nature of neutrinos by measuring the effective electron neutrino mass, <m(nu)>. In addition, the atmospheric neutrino oscillation experiments imply that at least one neutrino has a mass greater than about 50 meV. The Majorana Experiment expects to probe an effective neutrino mass near this critical value. Majorana is a next-generation Ge-76 double-beta decay search. It will employ 500 kg of Ge, isotopically enriched to 86% in Ce-76, in the form of similar to 200 detectors in a close-packed array. Each crystal will be electronically segmented and each segment fitted with pulse-shape analysis electronics. This combination of segmentation and pulse-shape analysis significantly improves our ability to discriminate neutrinoless double beta-decay from internal cosmogenic Ge-68 and Co-60. The half-life sensitivity is estimated to be 4.2 x 10(27) y corresponding to a <m(nu)> range of less than or equal to 20-70 meV, depending on the nuclear matrix elements used to interpret the data.
引用
收藏
页码：247 / 252
页数：6
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