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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=57" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=95525&size=small" /></div> <h1 class="ph">南极2.4公里冰下建成巨型望远镜 </h1> <p class="xg1"> 时间：2010-12-27 21:09<a class="zz" href="home.php?mod=space&uid=95525">作者：dameinv</a> 阅读<em id="_viewnum">(4031)</em> 评论: 0</p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=57" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>最后的电子光学组件(DOMs)被放入组成冰立方阵列的一个冰洞里，冰立方是全球最大的中微子望远镜，它建在美国阿蒙森·史考特南极站附近的南极冻原下。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"> 最后的<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>光学组件(DOMs)被放入组成冰立方阵列的一个冰洞里，冰立方是全球最大的中微子望远镜，它建在美国阿蒙森·史考特南极站附近的南极冻原下。 <BR><BR> <P><A href="http://www.oecr.com/data/attachment/portal/201012/27/210600rzesryllsslzefks.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201012/27/210600rzesryllsslzefks.jpg"></A></P> <P> </P> <P><A href="http://www.oecr.com/data/attachment/portal/201012/27/210608yw1huzpucsihruwr.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201012/27/210608yw1huzpucsihruwr.jpg"></A></P> <P>冰立方阵列由放进很深的冰洞里的众多<a href="http://sensor.oecr.com" target="_blank" class="relatedlink">传感</a>器串组成。靠近冰面的IceTop由两层探测器组成。图的右下角绘制的巴黎埃菲尔铁塔的图像，是用来与这个探测器进行对比，让它的大小更加一目了然。</P> <P><A href="http://www.oecr.com/data/attachment/portal/201012/27/210621lyk3chgzwwg43oyb.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201012/27/210621lyk3chgzwwg43oyb.jpg"></A></P> <P> </P> <P><A href="http://www.oecr.com/data/attachment/portal/201012/27/2106313zetw55e3ezb2jhb.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201012/27/2106313zetw55e3ezb2jhb.jpg"></A></P> <P>斯德哥尔摩大学的马提亚斯·丹宁格尔正在协助安装最后的电子光学组件冰立方中微子天文台的建设工作已经完成 </P> <P>新浪科技讯 北京时间12月27日消息，在南极洲8000英尺(2.44公里)深的冰层下，巨型望远镜——冰立方中微子望远镜的建设工作已经完成。<BR><BR> 冰立方中微子天文台是建在南极的一个巨型望远镜，它的目的是发现以光速穿过地球的中微子，这是一种令人难以捉摸的亚原子粒子。尽管科学家利用冰立方收集数据的时间已经长达数年，但是它的建设工作直到上周末才结束。人们对中微子知之甚少，但是认为它们携带着有关我们的星系和神秘黑洞诞生的信息。<BR><BR> <a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>学家认为，中微子在猛烈的宇宙事件中诞生，例如位于宇宙边缘的遥远星系相撞或黑洞的产物。这些神秘的高能粒子能在太空里穿行几十亿光年，而不会被磁场和原子吸收或偏转运行方向。通过它们，科学家能找到一些有关宇宙最基本问题的答案。不过要实现这个目的，首先你要发现中微子。为此，科学家正在利用冰观测中微子撞击(组成水冰分子的)原子的罕见场面。<BR><BR> 这个巨大的望远镜建在南极深达8000英尺(2.44公里)的冰原下。整个项目耗资2.79亿美元，美国国家科学基金会为其提供了2.42亿美元资助。建设工作的最后阶段是为5160个光学传感器钻86个孔，现在这些传感器已经安装完毕，成为主探测器的组成部分。中微子与原子相撞产生的粒子名叫μ介子，生成的蓝色光束被称作“切伦科夫辐射”。由于南极冰的透明度极高，冰立方的光学传感器能发现这种蓝光。<BR></P> <P><A href="http://www.oecr.com/data/attachment/portal/201012/27/210648rwh55qyz0axh52ya.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201012/27/210648rwh55qyz0axh52ya.jpg"></A></P> <P><BR>人们准备安装最后的电子光学组件，它上面有全队所有成员的签名。</P> <P><A href="http://www.oecr.com/data/attachment/portal/201012/27/210700qd7dvdvpp0qbw408.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201012/27/210700qd7dvdvpp0qbw408.jpg"></A></P> <P>这是一束“切伦科夫光束”穿过冰立方望远镜的艺术概念图 </P> <P><A href="http://www.oecr.com/data/attachment/portal/201012/27/210706979nzyu1p1nygi11.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201012/27/210706979nzyu1p1nygi11.jpg"></A></P> <P>冰立方将会把南极μ介子及中微子探测器列阵（黄色圆柱体）团团围住，后者是一个更小的中微子探测器。彩色斑点<a href="http://display.oecr.com" target="_blank" class="relatedlink">显示</a>的是通过冰立方阵列的中微子的路径，这是由电子光学组件发现的。 </P> <P><A href="http://www.oecr.com/data/attachment/portal/201012/27/2107121r9dltjd9j11r15f.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201012/27/2107121r9dltjd9j11r15f.jpg"></A></P> <P>美国阿蒙森·史考特南极站附近的南极冻原上的冰立方实验室。过去5年科学家一直在建这个望远镜，直到最近它才竣工 科学家通过在亚原子相撞后进行的试验，可以追踪到中微子的运行方向、查找到它的起源，看一看它是由黑洞还是由撞击星系产生的。然而，这一过程比探测μ介子更加复杂。因为每个μ介子都是由一个宇宙中微子产生，而位于探测器上方大气里的宇宙射线可以生成一百多万个中微子。为了避免这种干扰，冰立方的传感器直接瞄准下方——经地心指向北极天空，用来探测穿过地球的中微子。</P> <P>由于中微子是目前已知的唯一一种可以畅通无阻地穿过物质的粒子，故冰立方和南极μ介子及中微子探测器列阵(AMANDA)把地球当做过滤器，以便选出中微子与原子相撞产生的μ介子。令人捉摸不透的中微子的性质，还决定了冰立方的建设位置。中微子望远镜的透明度必须很高，以便分布很广的传感器阵列可以发现撞击产生的光，而且这个环境必须足够黑，以防自然光产生干扰。除此以外，它还必须深埋地下，以避免南半球的宇宙射线对其产生干扰。南极冰符合所有这些条件。<BR><BR>天文台的大小(边长一公里的立方体冰块)非常重要，因为这可增加中微子与原子相撞的机会，大大提高观测成功率。另外，南极冰是用来观测这种罕见事件的完美选择。全球大部分冰里都含有气泡或其他杂质，这会使观察结果产生误差。而南极冰基本上完全是由水冰组成的巨大冰川，这意味着它包含更多原子，因此会大大增加中微子撞击的机会。圆形探测器被串成串，放入用热水钻开凿出来的冰洞里，钻每个冰洞需要融冰多达20万加仑。每根电缆线上有60个传感器，86串这样的传感器串组成冰立方的主探测器。</P></td></tr></table> <!--[diy=diycontentbottom]--><div id="diycontentbottom" class="area"></div><!--[/diy]--> <script src="data/cache/home.js?eOg" type="text/javascript"></script> <div id="click_div"><table cellpadding="0" cellspacing="0" class="atd"> <tr><td> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=click&op=add&clickid=1&idtype=aid&id=1434&hash=5eaeebc53dbedee3c911b01aa0e570f2&handlekey=clickhandle" id="click_aid_1434_1" onclick="showWindow(this.id, this.href);doane(event);"> <img src="static/image/click/jidan.gif" 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