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</div> <p class="title is-5 mathjax"> The Processing of Enriched Germanium for the MAJORANA DEMONSTRATOR and R&D for a Possible Future Ton-Scale Ge-76 Double-Beta Decay Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/nucl-ex?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/nucl-ex?searchtype=author&query=Arnquist%2C+I+J">I. J. Arnquist</a>, <a href="/search/nucl-ex?searchtype=author&query=Avignone%2C+F+T">F. T. Avignone III</a>, <a href="/search/nucl-ex?searchtype=author&query=Barabash%2C+A+S">A. S. Barabash</a>, <a href="/search/nucl-ex?searchtype=author&query=Bertrand%2C+F+E">F. E. Bertrand</a>, <a href="/search/nucl-ex?searchtype=author&query=Bradley%2C+A+W">A. W. Bradley</a>, <a href="/search/nucl-ex?searchtype=author&query=Brudanin%2C+V">V. Brudanin</a>, <a href="/search/nucl-ex?searchtype=author&query=Busch%2C+M">M. Busch</a>, <a href="/search/nucl-ex?searchtype=author&query=Buuck%2C+M">M. Buuck</a>, <a href="/search/nucl-ex?searchtype=author&query=Caja%2C+J">J. Caja</a>, <a href="/search/nucl-ex?searchtype=author&query=Caja%2C+M">M. Caja</a>, <a href="/search/nucl-ex?searchtype=author&query=Caldwell%2C+T+S">T. S. Caldwell</a>, <a href="/search/nucl-ex?searchtype=author&query=Christofferson%2C+C+D">C. D. Christofferson</a>, <a href="/search/nucl-ex?searchtype=author&query=Chu%2C+P+-">P. -H. Chu</a>, <a href="/search/nucl-ex?searchtype=author&query=Cuesta%2C+C">C. Cuesta</a>, <a href="/search/nucl-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunagan%2C+C">C. Dunagan</a>, <a href="/search/nucl-ex?searchtype=author&query=Dunstan%2C+D+T">D. T. Dunstan</a>, <a href="/search/nucl-ex?searchtype=author&query=Efremenko%2C+Y">Yu. Efremenko</a>, <a href="/search/nucl-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/nucl-ex?searchtype=author&query=Elliott%2C+S+R">S. R. Elliott</a>, <a href="/search/nucl-ex?searchtype=author&query=Gilliss%2C+T">T. Gilliss</a>, <a href="/search/nucl-ex?searchtype=author&query=Giovanetti%2C+G+K">G. K. Giovanetti</a>, <a href="/search/nucl-ex?searchtype=author&query=Goett%2C+J">J. Goett</a>, <a href="/search/nucl-ex?searchtype=author&query=Green%2C+M+P">M. P. Green</a> , et al. (45 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1707.06255v1-abstract-short" style="display: inline;"> The MAJORANA DEMONSTRATOR is an array of point-contact Ge detectors fabricated from Ge isotopically enriched to 88% in Ge-76 to search for neutrinoless double beta decay. The processing of Ge for germanium detectors is a well-known technology. However, because of the high cost of Ge enriched in Ge-76, special procedures were required to maximize the yield of detector mass and to minimize exposure… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.06255v1-abstract-full').style.display = 'inline'; document.getElementById('1707.06255v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1707.06255v1-abstract-full" style="display: none;"> The MAJORANA DEMONSTRATOR is an array of point-contact Ge detectors fabricated from Ge isotopically enriched to 88% in Ge-76 to search for neutrinoless double beta decay. The processing of Ge for germanium detectors is a well-known technology. However, because of the high cost of Ge enriched in Ge-76, special procedures were required to maximize the yield of detector mass and to minimize exposure to cosmic rays. These procedures include careful accounting for the material; shielding it to reduce cosmogenic generation of radioactive isotopes; and development of special reprocessing techniques for contaminated solid germanium, shavings, grindings, acid etchant and cutting fluids from detector fabrication. Processing procedures were developed that resulted in a total yield in detector mass of 70%. However, none of the acid-etch solution and only 50% of the cutting fluids from detector fabrication were reprocessed. Had they been processed, the projections for the recovery yield would be between 80 -- 85%. Maximizing yield is critical to justify a possible future ton-scale experiment. A process for recovery of germanium from the acid-etch solution was developed with yield of about 90%. All material was shielded or stored underground whenever possible to minimize the formation of Ge-68 by cosmic rays, which contributes background in the double-beta decay region of interest and cannot be removed by zone refinement and crystal growth. Formation of Ge-68 was reduced by a significant factor over that in natural abundance detectors not protected from cosmic rays. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1707.06255v1-abstract-full').style.display = 'none'; document.getElementById('1707.06255v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 July, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Submitted to NIM-A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Inst. and Methods in Physics Research, A 877 (2018) 314-322 </p> </li> </ol> <div class="is-hidden-tablet">  <span 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