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A search for neutrinoless double bet...

Bryant, Adam Douglas.

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A search for neutrinoless double beta decay of tellurium-130 .

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	A search for neutrinoless double beta decay of tellurium-130 ./
作者:	Bryant, Adam Douglas.
面頁冊數:	191 p.
附註:	Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: .
Contained By:	Dissertation Abstracts International71-09B.
標題:	Physics, Nuclear. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3413326
ISBN:	9781124140216

A search for neutrinoless double beta decay of tellurium-130 .
Bryant, Adam Douglas.

A search for neutrinoless double beta decay of tellurium-130 . - 191 p.

Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: .

Thesis (Ph.D.)--University of California, Berkeley, 2010.

This dissertation describes an experimental search for neutrinoless double beta (0nubetabeta) decay of 130Te. An observation of 0nubetabeta decay would establish that neutrinos are Majorana fermions and would constrain the neutrino mass scale. The data analyzed were collected by two bolometric experiments: CUORICINO and an R&D experiment for CUORE known as the Three Towers Test. Both experiments utilized arrays of TeO 2 crystals operated as bolometers at &sim;10 mK in a dilution refrigerator. The bolometers measured the energy deposited by particle interactions in the crystals by recording the induced change in crystal temperature. Between the two experiments, there were 81 TeO2 bolometers used in the analysis, each of which was an independent detector of nuclear decays as well as a source of 130Te. The experiments were conducted underground at a depth of about 3300 meters water equivalent in Hall A of the Laboratori Nazionali del Gran Sasso in Assergi, Italy, in order to shield the detectors from cosmic rays. The data analyzed represent an exposure of 19.9 kg · y of 130Te (18.6 kg · y from CUORICINO and 1.3 kg · y from the Three Towers Test). In addition to the combined analysis of the two experiments, an analysis of CUORICINO data alone is presented in order to compare with an independent analysis being carried out by collaborators at the University of Milano-Bicocca.

ISBN: 9781124140216Subjects--Topical Terms:

1019065
Physics, Nuclear.

A search for neutrinoless double beta decay of tellurium-130 .
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245 1 2 $a A search for neutrinoless double beta decay of tellurium-130 .
300 $a 191 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-09, Section: B, page: .
500 $a Adviser: Yury G. Kolomensky.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2010.
520 $a This dissertation describes an experimental search for neutrinoless double beta (0nubetabeta) decay of 130Te. An observation of 0nubetabeta decay would establish that neutrinos are Majorana fermions and would constrain the neutrino mass scale. The data analyzed were collected by two bolometric experiments: CUORICINO and an R&D experiment for CUORE known as the Three Towers Test. Both experiments utilized arrays of TeO 2 crystals operated as bolometers at &sim;10 mK in a dilution refrigerator. The bolometers measured the energy deposited by particle interactions in the crystals by recording the induced change in crystal temperature. Between the two experiments, there were 81 TeO2 bolometers used in the analysis, each of which was an independent detector of nuclear decays as well as a source of 130Te. The experiments were conducted underground at a depth of about 3300 meters water equivalent in Hall A of the Laboratori Nazionali del Gran Sasso in Assergi, Italy, in order to shield the detectors from cosmic rays. The data analyzed represent an exposure of 19.9 kg · y of 130Te (18.6 kg · y from CUORICINO and 1.3 kg · y from the Three Towers Test). In addition to the combined analysis of the two experiments, an analysis of CUORICINO data alone is presented in order to compare with an independent analysis being carried out by collaborators at the University of Milano-Bicocca.
520 $a No signal due to 0nubetabeta decay is observed, and therefore a limit on the partial half-life for the decay is set. From a simultaneous fit to the 81 independent detectors, the rate of 0nubetabeta decay of 130Te is measured to be Gamma0nubetabeta( 130Te) = (-0.6+/-1.4 (stat.) +/- 0.4 (syst.)) x 10-25 y-1, which corresponds to a lower limit on the partial half-life for 0nubetabeta decay of 130Te of T0nbb1/2 (130Te) > 3.0x1024 y (90% C.L.). Converting the half-life limit to an upper limit on the effective Majorana neutrino mass, mbetabeta, using a set of recent nuclear matrix element calculations results in mbetabeta < 0.25--0.68 eV (90% C.L.), where the range reflects the spread of calculated nuclear matrix element values. These results disagree by at least 1.2sigma, depending on the nuclear matrix element calculation, with a claim of observation of 0nubetabeta decay of 76Ge, assuming that the dominant mechanism driving 0nubetabeta decay is the exchange of light Majorana neutrinos.
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650 4 $a Physics, Elementary Particles and High Energy. $3 1019488
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790 1 0 $a Norman, Eric B. $e committee member
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791 $a Ph.D.
792 $a 2010
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