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When a star heavier than eight times the sun's mass explodes, its core collapses to form a neutron star or a black hole. Further improvement in the accuracy of any neutron lifetime experiment by means of ultracold neutrons (UCN) in material bottles is limited due to unavoidable systematic effects when the UCN are reflected from the walls. When Brad Filippone and a team of physicists first tried to slow down neutrons six years ago, their initial experiment was pretty much a bomb. |
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