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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=58" 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=5&size=small" /></div> <h1 class="ph">反物质原子保存时间延长至17分钟 </h1> <p class="xg1"> 时间：2011-5-6 16:14<a class="zz" href="home.php?mod=space&uid=5">作者：tlx</a> 阅读<em id="_viewnum">(1555)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=2000&idtype=aid" title="查看全部评论"><em id="_commentnum">1</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=58" 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>俄罗斯媒体报道称，上周，欧洲核子研究中心的科学家利用反氢激光物理仪器（ALPHA）捕获到了数量可观反氢原子，共计309个，并使其在粒子陷阱装置中保存了1000秒（约17）分钟，使其保存时间较以往增加了四个数量级。</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">俄罗斯媒体报道称，上周，欧洲核子研究中心的科学家利用反氢<a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a><a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>仪器（ALPHA）捕获到了数量可观反氢原子，共计309个，并使其在粒子陷阱装置中保存了1000秒（约17）分钟，使其保存时间较以往增加了四个数量级。2010年，欧洲原子能研究中心（CERN）利用反氢激光物理仪器（ALPHA）第一次创造出并捕获到了数量可观的飞行状态下的反氢原子，不过这个“可观”只是相较过去而言，当时的技术力仍然只允许他们将38个反氢原子用磁场保存0.172秒，在这么短的时间内对这么少的原子进行研究和分析，显然还是不太够。<BR><BR>科学家表示，要想保存住反物质原子是十分困难的事，没有足够强的电荷和磁场，反物质原子是很难停留在磁场中的。一般反物质原子往往只会出现几毫秒就会立即消失。科学家们利用多个磁场的综合作用，将反质子和正<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>集合到一起，才形成反氢原子，然而，由于反氢原子不带电，不能通过电磁方法进行捕捉，只能利用通过原子转动时产生的磁矩（magnetic moment）通过磁力方面的途径去进行约束和捕捉，其难度可想而知。为成功捕捉反氢原子,科学家们对分离器进行了深度冷却，并为此加装了结构异常复杂的设备。此次实验为今后的反物质研究打下了更为坚实的基础。接下来，欧洲核子研究中心的科学家们计划研究，万有引力对反物质的影响。<BR> <P><A href="http://www.oecr.com/data/attachment/portal/201105/06/161322tcb5ccwe69csrw2s.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201105/06/161322tcb5ccwe69csrw2s.jpg"></A><BR> <BR>用于提取反物质原子的核心部件 </P> <P><A href="http://www.oecr.com/data/attachment/portal/201105/06/1613280zqyky2toagu2om0.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201105/06/1613280zqyky2toagu2om0.jpg"></A></P> <P>用于提取反物质原子的磁场示意图 </P> <P><A href="http://www.oecr.com/data/attachment/portal/201105/06/161342tpegt3eezzw08tze.jpg" target=_blank><IMG src="http://www.oecr.com/data/attachment/portal/201105/06/161342tpegt3eezzw08tze.jpg"></A></P> <P>科学家们正在实验室里构建结构复杂的反物质研究设备 <BR><BR>通过试验，观看反氢原子在没有约束的情况下，受到重力影响后是被吸引呢还是被排斥——换言之，反物质与我们的世界的相互作用力是否相反。当然，在目前的物理学框架下，几乎可以确定反氢原子仍然会受到地球重力而“下落”。在下一步的试验中，ALPHA小组将会把一些反氢原子冷却到接近绝对零度的状态、让它们的运动变得极为缓慢，然后取消磁场约束，观察它们的坠落方向。虽然希望渺茫，但假如反氢原子“向上坠落”，反重力就将成为可能，而人类的未来也会因此而变得与众多科幻故事更为相似。<BR><BR>此前，曾有科学家表示，研究万有引力对反物质的影响可能性几乎为零，因为科学家们所能控制住的反物质十分少，而且其留存时间是极其短暂的。但此次实验中，科学家们成功将反物质的保存时间延长了4倍，为进行进一步研究提供了条件。反物质是物理学领域最令人迷惑的问题之一。为什么今天的宇宙由正物质构成而不是反物质？当前有关亚原子世界的最优<a href="http://theory.oecr.com" target="_blank" class="relatedlink">理论</a>——粒子物理标准模型也无法给出答案。但科学家认为，物质和反物质属性之间的微小差异可能就是答案所在，而这种差异体现在违反CPT对称定理上。 CPT对称是指，把粒子用反粒子替换，右手坐标系换成左手坐标系，以及所有粒子速度反向，物理定律不变。</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 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