Fizik\u00e7iler, termon\u00fckleer bomban\u0131n kozmik bir versiyonuyla k\u00fc\u00e7\u00fck uranyum kristallerinin bir \u00f6l\u00fc y\u0131ld\u0131z i\u00e7erisindeki b\u00fcy\u00fck k\u00fctleli patlamalar\u0131 tetikleyebilece\u011fini ileri s\u00fcr\u00fcyorlar.<\/p>\n
Ara\u015ft\u0131rmac\u0131lar\u0131n dikkat \u00e7ekti\u011fi “\u00f6l\u00fc y\u0131ld\u0131zlar”, beyaz c\u00fcceler olarak bilinen, G\u00fcne\u015f’in yar\u0131 k\u00fctlesine sahip ve yo\u011funlu\u011fu olduk\u00e7a y\u00fcksek olan y\u0131ld\u0131zlard\u0131r. Beyaz c\u00fcceler ya\u015famlar\u0131n\u0131n son evresindedir ve ya\u015f ald\u0131k\u00e7a yava\u015f yava\u015f so\u011furlar. Bu s\u00fcre\u00e7te, uranyum gibi a\u011f\u0131r elementler kristalize olmaya ba\u015flar ve y\u0131ld\u0131zlar\u0131n \u00e7ekirdeklerinde \u201ckar tanelerini\u201d olu\u015ftururlar. Esas\u0131nda bir beyaz c\u00fcce i\u00e7 bas\u0131n\u00e7 olu\u015fturamaz, i\u00e7 bas\u0131n\u00e7 olu\u015fumuna neden olacak t\u00fcm olaylar (f\u00fczyon gibi) durmu\u015ftur. Fakat bir beyaz c\u00fcce i\u00e7erisindeki t\u00fcm maddeler yer\u00e7ekimi etkisiyle i\u00e7eri do\u011fru s\u0131k\u0131\u015f\u0131r ve e\u011fer yeteri kadar uranyum y\u0131\u011f\u0131n\u0131 bir araya gelirse -yakla\u015f\u0131k bir kum tanesinin k\u00fctlesi kadar- n\u00fckleer f\u00fczyon tepkime zincirinin ba\u015flamas\u0131na ya da atom \u00e7ekirde\u011finin b\u00f6l\u00fcnmesine neden olurlar.<\/p>\n
\u0130ki fizik\u00e7i 29 Mart g\u00fcn\u00fc Pyhsical Review Letters<\/em>\u2019da yay\u0131mlanan bir makalede bu reaksiyonlar\u0131n y\u0131ld\u0131zdaki s\u0131cakl\u0131\u011f\u0131 artt\u0131r\u0131p n\u00fckleer f\u00fczyon (atom \u00e7ekirde\u011finin birle\u015fmesi) olu\u015fturarak y\u0131ld\u0131z\u0131 yok ettikleri devasa bir patlamay\u0131 hesaplam\u0131\u015flard\u0131. Illinois Devlet Universitesi’nden Matt Caplan, Uranyum taneciklerinin etkisinin fisyon tepkimelerinin f\u00fczyonu tetikledi\u011fi \u00e7ok g\u00fc\u00e7l\u00fc termon\u00fckleer bir silah olan hidrojen bombas\u0131na benzedi\u011fini s\u00f6yl\u00fcyor ve bu senaryonun h\u00e2l\u00e2 varsay\u0131msal oldu\u011funu kabul ediyor. G\u00f6r\u00fcn\u00fc\u015fe bak\u0131l\u0131rsa, Uranyum kar tanelerinin ger\u00e7ekten y\u0131ld\u0131zsal detanosyanlara (patlama\/infilak etme) sebep olup olmayaca\u011f\u0131n\u0131 saptamak i\u00e7in daha fazla ara\u015ft\u0131rmaya ihtiyac\u0131m\u0131z var.<\/p>\n Beyaz c\u00fccelerin patlamaya yatk\u0131n oldu\u011fu biliniyordu ve patlamalar\u0131n k\u00f6keni “1a tipi s\u00fcpernovalar” olarak adland\u0131r\u0131l\u0131yordu. Bu t\u00fcr patlamalar beyaz c\u00fccelerin etraf\u0131nda d\u00f6nd\u00fc\u011f\u00fc y\u0131ld\u0131z\u0131 yutmaya ba\u015flamas\u0131yla ger\u00e7ekle\u015fir. Ara\u015ft\u0131rmac\u0131lar\u0131n uranyum kar tanesi fikri, Tip 1a s\u00fcpernovalar\u0131n\u0131n ba\u015fka bir y\u0131ld\u0131za ihtiya\u00e7 olmadan \u00e7ok k\u00fc\u00e7\u00fck bir k\u0131sm\u0131n\u0131 a\u00e7\u0131klayabilece\u011fi tamamen yeni bir d\u00fczenektir.<\/p>\n Kaynak:<\/strong> https:\/\/www.sciencenews.org\/article\/dead-stars-uranium-snowflakes-thermonuclear-supernova-explosions<\/p>\n https:\/\/imagine.gsfc.nasa.gov\/science\/objects\/dwarfs2.html<\/p>\n","protected":false},"excerpt":{"rendered":" Fizik\u00e7iler, termon\u00fckleer bomban\u0131n kozmik bir versiyonuyla k\u00fc\u00e7\u00fck uranyum kristallerinin bir \u00f6l\u00fc y\u0131ld\u0131z i\u00e7erisindeki b\u00fcy\u00fck k\u00fctleli patlamalar\u0131 tetikleyebilece\u011fini ileri s\u00fcr\u00fcyorlar. Ara\u015ft\u0131rmac\u0131lar\u0131n dikkat \u00e7ekti\u011fi “\u00f6l\u00fc y\u0131ld\u0131zlar”, beyaz c\u00fcceler olarak bilinen, G\u00fcne\u015f’in yar\u0131 k\u00fctlesine sahip ve yo\u011funlu\u011fu olduk\u00e7a y\u00fcksek olan y\u0131ld\u0131zlard\u0131r. Beyaz c\u00fcceler ya\u015famlar\u0131n\u0131n son evresindedir ve ya\u015f ald\u0131k\u00e7a yava\u015f yava\u015f so\u011furlar. Bu s\u00fcre\u00e7te, uranyum gibi a\u011f\u0131r elementler […]<\/p>\n","protected":false},"author":3113,"featured_media":49812,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[30,19],"tags":[860,5577,2300,7603,2989],"class_list":["post-49810","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomi","category-bilim-gundemi","tag-beyaz-cuce","tag-patlama","tag-supernova","tag-termonukleer","tag-uranyum"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t