{"id":100150,"date":"2019-12-25T19:04:58","date_gmt":"2019-12-26T03:04:58","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2019\/12\/viewpoint-a-forbidden-transition-allowed-for-stars"},"modified":"2019-12-25T19:04:58","modified_gmt":"2019-12-26T03:04:58","slug":"viewpoint-a-forbidden-transition-allowed-for-stars","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2019\/12\/viewpoint-a-forbidden-transition-allowed-for-stars","title":{"rendered":"Viewpoint: A Forbidden Transition Allowed for Stars"},"content":{"rendered":"

<\/a><\/p>\n

The discovery of an exceptionally strong \u201cforbidden\u201d beta-decay involving fluorine and neon could change our understanding of the fate of intermediate-mass stars.<\/p>\n

Every year roughly 100 billion stars are born and just as many die. To understand the life cycle of a star, nuclear physicists and astrophysicists collaborate to unravel the physical processes that take place in the star\u2019s interior. Their aim is to determine how the star responds to these processes and from that response predict the star\u2019s final fate. Intermediate-mass stars, whose masses lie somewhere between 7 and 11 times that of our Sun, are thought to die via one of two very different routes: thermonuclear explosion or gravitational collapse. Which one happens depends on the conditions within the star when oxygen nuclei begin to fuse, triggering the star\u2019s demise. Researchers have now, for the first time, measured a rare nuclear decay of fluorine to neon that is key to understanding the fate of these \u201cin between\u201d stars [1<\/a>, 2<\/a>]. Their calculations indicate that thermonuclear explosion and not gravitational collapse is the more likely expiration route.<\/p>\n

The evolution and fate of a star strongly depend on its mass at birth. Low-mass stars\u2014such as the Sun\u2014transition first into red giants and then into white dwarfs made of carbon and oxygen as they shed their outer layers. Massive stars\u2014those whose mass is at least 11 times greater than the Sun\u2019s\u2014also transition to red giants, but in the cores of these giants, nuclear fusion continues until the core has turned completely to iron. Once that happens, the star stops generating energy and starts collapsing under the force of gravity. The star\u2019s core then compresses into a neutron star, while its outer layers are ejected in a supernova explosion. The evolution of intermediate-mass stars is less clear. Predictions indicate that they can explode both via the gravitational collapse mechanism of massive stars and by a thermonuclear process [3<\/a>\u2013 6<\/a>]. The key to finding out which happens lies in the properties of an isotope of neon and its ability to capture electrons.<\/p>\n","protected":false},"excerpt":{"rendered":"

The discovery of an exceptionally strong \u201cforbidden\u201d beta-decay involving fluorine and neon could change our understanding of the fate of intermediate-mass stars. Every year roughly 100 billion stars are born and just as many die. To understand the life cycle of a star, nuclear physicists and astrophysicists collaborate to unravel the physical processes that take [\u2026]<\/p>\n","protected":false},"author":396,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33,385,873,219],"tags":[],"class_list":["post-100150","post","type-post","status-publish","format-standard","hentry","category-cosmology","category-evolution","category-nuclear-energy","category-physics"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/100150","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/396"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=100150"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/100150\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=100150"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=100150"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=100150"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}