{"product_id":"trialpha-the-hoyle-state-physics-t-shirt","title":"Trialpha – The Hoyle State Physics T-Shirt","description":"\u003cp\u003eTrialpha juggles three helium nuclei inside a star. For a moment they become carbon, and that is why you exist.\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eStars make carbon by fusing three helium-4 nuclei (alpha particles), which only works well because carbon-12 has an excited state at just the right energy. The Hoyle state sits at 7.654 MeV, spin-parity 0⁺, about 0.38 MeV above the 7.275 MeV three-alpha threshold. It almost always falls apart again; only rarely does it settle down into ordinary carbon.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e3 ⁴He → ¹²C*(7.654 MeV, 0⁺) → ¹²C + γγ (rarely)\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e⁴He: helium-4 nucleus, alpha particle\u003c\/li\u003e\n\u003cli\u003e¹²C*: excited carbon-12 nucleus\u003c\/li\u003e\n\u003cli\u003eMeV: mega-electronvolt, 1.602 × 10⁻¹³ J\u003c\/li\u003e\n\u003cli\u003e0⁺: spin 0, positive parity\u003c\/li\u003e\n\u003cli\u003eγ: gamma-ray photon\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eIn 1953 Fred Hoyle predicted a carbon level near 7.7 MeV; a Caltech team measured 7.68 ± 0.03 MeV, and Cook, Fowler and Lauritsen assigned it 0⁺ in 1957.\u003c\/p\u003e\u003ch3\u003eOn the shirt\u003c\/h3\u003e\u003cp\u003eFront: Trialpha, the pixel-art character, with the title. Back: the three-alpha reaction, the resonance energy and threshold, the 1953 prediction and measurement and the 1957 assignment. Printed on a unisex tee.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"S \/ White","offer_id":50936432525415,"sku":"22652936874482201127","price":29.99,"currency_code":"USD","in_stock":true},{"title":"S \/ Black","offer_id":50936432558183,"sku":"71911022184200434333","price":29.99,"currency_code":"USD","in_stock":true},{"title":"M \/ White","offer_id":50936432590951,"sku":"30566950877175491845","price":29.99,"currency_code":"USD","in_stock":true},{"title":"M \/ Black","offer_id":50936432623719,"sku":"14653659204967258015","price":29.99,"currency_code":"USD","in_stock":true},{"title":"L \/ White","offer_id":50936432656487,"sku":"20675468488066811844","price":29.99,"currency_code":"USD","in_stock":true},{"title":"L \/ Black","offer_id":50936432689255,"sku":"33976067365766092968","price":29.99,"currency_code":"USD","in_stock":true},{"title":"XL \/ White","offer_id":50936432722023,"sku":"20864069568043161218","price":29.99,"currency_code":"USD","in_stock":true},{"title":"XL \/ Black","offer_id":50936432754791,"sku":"26617806807984211629","price":29.99,"currency_code":"USD","in_stock":true},{"title":"2XL \/ White","offer_id":50936432787559,"sku":"33843176996744227028","price":29.99,"currency_code":"USD","in_stock":true},{"title":"2XL \/ Black","offer_id":50936432820327,"sku":"13652731648946445943","price":29.99,"currency_code":"USD","in_stock":true},{"title":"3XL \/ White","offer_id":50936432853095,"sku":"52508015435515146650","price":29.99,"currency_code":"USD","in_stock":true},{"title":"3XL \/ Black","offer_id":50936432885863,"sku":"59212858998832410490","price":29.99,"currency_code":"USD","in_stock":true},{"title":"4XL \/ White","offer_id":50936432918631,"sku":"27055110082734750230","price":29.99,"currency_code":"USD","in_stock":true},{"title":"4XL \/ Black","offer_id":50936432951399,"sku":"42768840300105993837","price":29.99,"currency_code":"USD","in_stock":true},{"title":"5XL \/ White","offer_id":50936432984167,"sku":"17491027862479093433","price":29.99,"currency_code":"USD","in_stock":true},{"title":"5XL \/ Black","offer_id":50936433016935,"sku":"24850689881990527985","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/hoyle-state_front_16_white.png?v=1793595193","url":"https:\/\/pixelatedphysics.com\/pt\/products\/trialpha-the-hoyle-state-physics-t-shirt","provider":"Pixelated Physics","version":"1.0","type":"link"}