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Brookhaven Lab Shuts Down Relativistic Heavy Ion Collider (RHIC)

2026年2月8日 21:34

🤖 AI Summary

**ブロークヘイブン国立研究所(BNL)の相対性重イオン衝突装置(RHIC)閉鎖まとめ(2026年)**

- **25年にわたる歴史と功績**
- 2000年に本格稼働し、金原子核の200 GeV/n衝突やスピン整列した陽子ビームの衝突など、他に類を見ない実験を実施。
- 初期の重イオン衝突でクォーク・グルオン・プラズマ(QGP)を生成し、2010年に「ほぼ完璧な液体」‑低粘性・高渦度のプラズマであることを確認。
- 反物質の大規模生成、陽子スピン問題の解決に寄与し、ビッグバン直前の状態を再現する世界唯一の装置となった。
- 2023年には新種の量子もつれを発見するなど、常に最前線の物理を探求。

- **最終衝突と残されたデータ**
- 2026年2月6日、DOE副長官ダリオ・ギルが赤いボタンを押し、最終衝突が行われた。
- 最終ランは約1年にわたり、数百ペタバイトのデータを取得。
- その中で「仮想粒子」の直接観測が報告され、量子真空の新たな探査手段となった。
- データは今後も解析が続き、RHICの科学的遺産は衝突停止後も生き続ける。

- **後継装置:電子イオン衝突装置(EIC)**
- RHICの地下リングのうち1本を流用し、電子ビームを加える新しいリングを建設予定(10年スパン)。
- EICは電子を「ナイフ」として重イオンを切り込み、クォーク・グルオンの構造をより精密に観測できる。
- 米国で初めての新規粒子加速器となり、欧州・アジアに先行された粒子物理の舞台に米国が再参入するシンボル。
- 「少なくとも10〜15年は、世界の若手物理学者にとってトップの研究拠点になる」ことが期待されている。

- **意義と今後**
- RHICの閉鎖は米国内唯一のヘビオン衝突型加速器の終焉であるが、EICの建設により「ビッグバン直前の物質」への探求は次のステージへと進む。
- 科学者たちは「甘く切ない」気持ちでRHICを送り出しつつ、より強力な装置で新たな発見を目指す姿勢を示している。
2001: "Brookhaven Labs has produced for the first time collisions of gold nuclei at a center of mass energy of 200GeV/nucleon." 2002: "There may be a new type of matter according to researchers at Brookhaven National Laboratory." 2010: The hottest man-made temperatures ever achived were a record 4 trillion degree plasma experiment at Brookhaven National Laboratory in New York... anointed the Guinness record holder." 2023: "Scientists at Brookhaven National Laboratory have uncovered an entirely new kind of quantum entanglement." 2026: On Friday, February 6, "a control room full of scientists, administrators and members of the press gathered" at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Lab in Upton, New York to witness its final collisions, reports Scientific American: The vibe had been wistful, but the crowd broke into applause as Darío Gil, the Under Secretary for Science at the U.S. Department of Energy, pressed a red button to end the collider's quarter-century saga... "I'm really sad" [said Angelika Drees, a BNL accelerator physicist]. "It was such a beautiful experiment and my research home for 27 years. But we're going to put something even better there." That "something" will be a far more powerful electron-ion collider to further push the frontiers of physics, extend RHIC's legacy and maintain the lab's position as a center of discovery. This successor will be built in part from RHIC's bones, especially from one of its two giant, subterranean storage rings that once held the retiring collider's supply of circulating, near-light speed nuclei...slated for construction over the next decade. [That Electron-Ion Collider, or EIC] will utilize much of RHIC's infrastructure, replacing one of its ion rings with a new ring for cycling electrons. The EIC will use those tiny, fast-flying electrons as tiny knives for slicing open the much larger gold ions. Physicists will get an unrivaled look into the workings of quarks and gluons and yet another chance to grapple with nature's strongest force. "We knew for the EIC to happen, RHIC needed to end," says Wolfram Fischer, who chairs BNL's collider-accelerator department. "It's bittersweet." EIC will be the first new collider built in the US since RHIC. To some, it signifies the country's reentry into a particle physics landscape it has largely ceded to Europe and Asia over the past two decades. "For at least 10 or 15 years," says Abhay Deshpande, BNL's associate laboratory director for nuclear and particle physics, "this will be the number one place in the world for [young physicists] to come." The RHIC was able "to separately send two protons colliding with precisely aligned spins — something that, even today, no other experiment has yet matched," the article points out: During its record-breaking 25-year run, RHIC illuminated nature's thorniest force and its most fundamental constituents. It created the heaviest, most elaborate assemblages of antimatter ever seen. It nearly put to rest a decades-long crisis over the proton's spin. And, of course, it brought physicists closer to the big bang than ever before... When RHIC at last began full operations in 2000, its initial heavy-ion collisions almost immediately pumped out quark-gluon plasma. But demonstrating this beyond a shadow of a doubt proved in some respects more challenging than actually creating the elusive plasma itself, with the case for success strengthening as RHIC's numbers of collisions soared. By 2010 RHIC's scientists were confident enough to declare that the hot soup they'd been studying for a decade was hot and soupy enough to convincingly constitute a quark-gluon plasma. And it was even weirder than they thought. Instead of the gas of quarks and gluons theorists expected, the plasma acted like a swirling liquid unprecedented in nature. It was nearly "perfect," with zero friction, and set a new record for twistiness, or "vorticity." For Paul Mantica, a division director for the Facilities and Project Management Division in the DOE's Office of Nuclear Physics, this was the highlight of RHIC's storied existence. "It was paradigm-changing," he says... Data from the final run (which began nearly a year ago) has already produced yet another discovery: the first-ever direct evidence of "virtual particles" in RHIC's subatomic puffs of quark-gluon plasma, constituting an unprecedented probe of the quantum vacuum. RHIC's last run generated hundreds of petabytes of data, the article points out, meaning its final smash "isn't really the end; even when its collisions stop, its science will live on." But Science News notes RHIC's closure "marks the end for the only particle collider operating in the United States, and the only collider of its kind in the world. Most particle accelerators are unable to steer two particle beams to crash head-on into one another."

Read more of this story at Slashdot.

Have We Been Thinking About Exercise Wrong for Half a Century?

2026年2月8日 17:34

🤖 AI Summary

**要約(日本語)**

50年以上続いた「毎日一定時間の運動をしろ」という指導は見直されつつあります。米国や世界保健機関は、もはや「中程度・激しい有酸素運動の最低時間」を設定していません。研究によれば、**30秒程度の短い高強度の動作**(例:数階分の階段を速く上る)でも、ジムでの長時間運動に匹敵する健康効果が得られることが分かっています。これを **VILPA(Vigorous Intermittent Lifestyle Physical Activity)** と呼び、以下の点が示されています。

- **1日4分程度**、数階の階段を「勢いよく」上がるだけで、体重低下や脳の老化抑制、脳卒中・心臓病リスクの大幅削減が期待できる。
- 米国の研究では、こうした日常的な激しい瞬間活動が**死亡率を44%減少**させたと報告。
- 効果は「**強度が最重要**」で、1分の激しい活動は、3分の中程度、または35〜49分の軽い活動と同等の予防効果がある。
- 呼吸で強度を判断できる:歌える=軽い、話せるが歌えない=中程度、会話が続かない=激しい。

**結論**
「運動は時間で測るべき」から「**すべての身体活動が価値ある**」へと考え方が転換。毎日の生活に取り入れやすい数分間の高強度動作—階段の上り降りや急いで歩くなど—が、長寿と健康維持に大きく寄与すると期待されています。
"After a half-century asking us to exercise more, doctors and physiologists say we have been thinking about it wrong," writes Washington Post columnist Michael J. Coren. "U.S. and World Health Organization guidelines no longer specify a minimum duration of moderate or vigorous aerobic activity." Movement-tracking studies show even tiny, regular bursts of effort — as short as 30 seconds — can capture many of the health benefits of the gym. Climbing two to three flights of stairs a few times per day could change your life. Experts call it VILPA, or vigorous intermittent lifestyle physical activity. "The message now is that all activity counts," said Martin Gibala, a professor and former chair of the kinesiology department at McMaster University in Canada... Just taking the stairs daily is associated with lower body weight and cutting the risk of stroke and heart disease — the leading (and largely preventable) cause of death globally. While it may not burn many calories (most exercise doesn't), it does appear to extend your health span. Leg power — a measure of explosive muscle strength — was a stronger predictor of brain aging than any lifestyle factors measured in a 2015 study in the journal Gerontology... How little activity can you do? Four minutes daily. Essentially, a few flights of stairs at a vigorous pace. That's the effort [Emmanuel Stamatakis, a professor of physical activity and population health at the University of Sydney] found delivered significant health benefits in that 2022 study of British non-exercisers. "We saw benefits from the first minute," Stamatakis said. For Americans, the effect is even more dramatic: a 44 percent drop in deaths, according to a peer-reviewed paper recently accepted for publication. "We showed for the first time that vigorous intensity, even if it's done as part of the day-to-day routine, not in a planned and structured manner, works miracles," Stamatakis said. "The key principle here is start with one, two minutes a day. The focus should be on making sure that it's something that you can incorporate into your daily routine. Then you can start thinking about increasing the dose." Intensity is the most important factor. You won't break a sweat in a brief burst, but you do need to feel it. A highly conditioned athlete might need to sprint to reach vigorous territory. But many people need only to take the stairs. Use your breathing as a guide, Stamatakis said: If you can sing, it's light intensity. If you can speak but not sing, you're entering moderate exertion. If you can't hold a conversation, it's vigorous. The biggest benefits come from moderate to vigorous movement. One minute of incidental vigorous activity prevents premature deaths, heart attacks or strokes as well as about three minutes of moderate activity or 35 to 49 minutes of light activity.

Read more of this story at Slashdot.

Are Big Tech's Nuclear Construction Deals a Tipping Point for Small Modular Reactors?

2026年2月8日 13:35

🤖 AI Summary

**要約(日本語)**

米国の原子力産業が転換点に来ていると Fortune が報じた。2024年1月、Meta はビル・ゲイツの TerraPower とサム・アルトマン支援の Oklo と提携し、約 4 GW(約300万世帯分)に相当する小型モジュラー原子炉(SMR)プロジェクトを開始した。主な用途は、オハイオ州に建設予定の Meta の「Prometheus」AIメガキャンパスと、同社が所有・運営する多数のデータセンターへのクリーンで安定した電力供給である。

- **業界関係者の見解**
- Wedbush Securities のテックリサーチ責任者 Dan Ives は、Meta の動きを「警告射撃」と呼び、2026年までにほぼすべての大手テック企業が核エネルギー事業に参入すると予測。
- 2030 年が規模拡大の分水嶺となり、米国で新たな核時代が本格化する可能性が高いと指摘。

- **SMR の特長**
- 従来の大型原子炉が10年かかるのに対し、SMR は約3年で建設可能。
- モジュラー方式なので、需要に応じて1~2基ずつ段階的に増設でき、データセンター「ハイパースケーラー」の電力需要に柔軟に対応できる。

- **リスクと期待**
- Oklo の CEO Jacob DeWitte は、脱炭素電源と安定したベースロード電力が欠如すれば大きなリスクになると警告。
- ハイパースケーラーは電力の最終消費者として市場の実在性を認識しており、核エネルギーの普及に重要な役割を果たすと述べた。

**結論**
Meta の核パートナーシップは、テック企業が自社データセンターのエネルギー需要を満たすために核エネルギーを本格的に取り入れる「最初の一撃」とみなされ、今後数年でSMR が大規模に導入されれば、米国のエネルギー政策とクリーンエネルギー転換に大きな転機をもたらす可能性がある。
Fortune reports on "a watershed moment" in American's nuclear power industry: In January, Meta partnered with Gates' TerraPower and Sam Altman-backed Oklo to develop about 4 gigawatts of combined SMR projects — enough to power almost 3 million homes — for "clean, reliable energy" both for Meta's planned Prometheus AI mega campus in Ohio and beyond. Analysts see Meta as the start of more Big Tech nuclear construction deals — not just agreements with existing plants or restarts such as the now-Microsoft-backed Three Mile Island. "That was the first shot across the bow," said Dan Ives, head of tech research for Wedbush Securities, of the Meta deals. "I would be shocked if every Big Tech company doesn't make some play on nuclear in 2026, whether a strategic partnership or acquisitions." Ives pointed out there are more data centers under construction than there are active data centers in the U.S. "I believe clean energy around nuclear is going to be the answer," he said. "I think 2030 is the key threshold to hit some sort of scale and begin the next nuclear era in the United States." Smaller SMR reactors can be built in as little as three years instead of the decade required for traditional large reactors. And they can be expanded, one or two modular reactors at a time, to meet increasingly greater energy demand from 'hyperscalers,' the companies that build and operate data centers. "There's major risk if nuclear doesn't happen," Oklo chairman and CEO Jacob DeWitte told Fortune, citing the need for emission-free power and consistent baseload electricity to meet skyrocketing demand. "The hyperscalers, as the ultimate consumers of power are, are looking at the space and seeing that the market is real. They can play a major role in helping make that happen," DeWitte said, speaking in his fast-talking, Silicon Valley startup mode.

Read more of this story at Slashdot.

A New Era for Security? Anthropic's Claude Opus 4.6 Found 500 High-Severity Vulnerabilities

2026年2月8日 11:34

🤖 AI Summary

**要約(日本語)**

Anthropic が新たに公開した大規模言語モデル **Claude Opus 4.6** が、ほとんど指示を与えずにオープンソースライブラリ内の **500 件以上の未発見の高深刻度ゼロデイ脆弱性** を検出したことが報じられた。

- **テスト方法**:Anthropic の「frontier red team」がサンドボックス環境で脆弱性解析ツールを併用し、モデルの「アウト・オブ・ザ・ボックス」機能だけでバグ探索を実施。すべての脆弱性は社内メンバーまたは外部のセキュリティ研究者により検証済み。
- **主な発見例**
- **GhostScript**(PDF・PostScript 処理ユーティリティ)のクラッシュを引き起こす欠陥
- **OpenSC**(スマートカードデータ処理)のバッファオーバーフロー
- **CGIF**(GIF 画像処理)のバッファオーバーフロー
- **意義**:AI がサイバー防御に大きく貢献できる転換点を示すと同時に、攻撃側にも同様のツールが利用可能になるリスクも指摘された。
- **今後の展望**:Anthropic の赤チームリーダー Logan Graham は、AI を活用した脆弱性発見ツールの導入を検討中。「モデルは極めて優秀で、さらに性能が向上する見込みがある。将来的にオープンソースソフトウェアのセキュリティ確保手段の主流になる可能性もある」と語っている。

この結果は、AI が自動的にゼロデイ脆弱性を大量に発見できることを示し、ソフトウェアセキュリティ分野における新たな時代の幕開けとなる可能性がある。
Axios reports: Anthropic's latest AI model has found more than 500 previously unknown high-severity security flaws in open-source libraries with little to no prompting, the company shared first with Axios. Why it matters: The advancement signals an inflection point for how AI tools can help cyber defenders, even as AI is also making attacks more dangerous... Anthropic debuted Claude Opus 4.6, the latest version of its largest AI model, on Thursday. Before its debut, Anthropic's frontier red team tested Opus 4.6 in a sandboxed environment [including access to vulnerability analysis tools] to see how well it could find bugs in open-source code... Claude found more than 500 previously unknown zero-day vulnerabilities in open-source code using just its "out-of-the-box" capabilities, and each one was validated by either a member of Anthropic's team or an outside security researcher... According to a blog post, Claude uncovered a flaw in GhostScript, a popular utility that helps process PDF and PostScript files, that could cause it to crash. Claude also found buffer overflow flaws in OpenSC, a utility that processes smart card data, and CGIF, a tool that processes GIF files. Logan Graham, head of Anthropic's frontier red team, told Axios they're considering new AI-powered tools to hunt vulnerabilities. "The models are extremely good at this, and we expect them to get much better still... I wouldn't be surprised if this was one of — or the main way — in which open-source software moving forward was secured."

Read more of this story at Slashdot.

The World's First Sodium-Ion Battery in Commercial EVs - Great at Low Temperatures

2026年2月8日 10:17

🤖 AI Summary

中国のバッテリーメーカーCATLと長安自動車は、2026年中頃に世界初の乗用車向けナトリウムイオン電池を搭載したEVを実用化する計画です。搭載される「Naxtra」電池は、チャガン Nevo A06セダンで約400 km(中国軽自動車テストサイクル)を走行でき、エネルギー密度は175 Wh/kgでニッケルリッチ系より低いものの、リチウムイオンリン酸系(LFP)と同等です。最大の特徴は低温性能で、‑30℃でも放電出力がLFPの約3倍とされ、火災リスクの低減や極端な気候への適応が期待されます。今後はAvatr、Deepal、Qiyuan、Uniといった長安グループの他モデルへも順次展開され、リチウムイオンとナトリウムイオンが補完し合う「二元化学」エコシステムの構築が目指されます。
Long-time Slashdot reader Geoffrey.landis shared this report from InsideEVs: Chinese battery giant CATL and automaker Changan Automobile are preparing to put the world's first passenger car powered by sodium-ion batteries on public roads by mid-2026. And if the launch is successful, it could usher in an era where electric vehicles present less of a fire risk and can better handle extreme temperatures. The CATL Naxtra sodium-ion battery will debut in the Changan Nevo A06 sedan, delivering an estimated range of around 400 kilometers (249 miles) on the China Light-Duty Test Cycle. From there, the battery will roll out across Changan's broader portfolio, including EVs from Avatr, Deepal, Qiyuan and Uni, the company said. "The launch represents a major step in the industry's transition toward a dual-chemistry ecosystem, where sodium-ion and lithium-ion batteries complement each other to meet diverse customer needs," CATL said in a press release... It delivers 175 watt-hours per kilogram of energy density, which is lower than nickel-rich chemistries but roughly on par with lithium ion phosphate batteries... Where the Naxtra battery really stands out, however, is cold-weather performance. CATL says its discharge power at -30 degrees Celsius (-22 degrees Fahrenheit) is three times higher than that of lithium ion phosphate batteries.

Read more of this story at Slashdot.

Is the 'Death of Reading' Narrative Wrong?

2026年2月8日 08:12

🤖 AI Summary

**要旨(日本語)**

デジタル機器の普及が読書を壊滅させたという「読書の死」説は、実際のデータと照らし合わせると過大評価されている。社会心理学者アダム・マストロイアニは、以下の点を指摘している。

1. **販売・書店の実態は好調**
- 2025年の書籍売上は2019年を上回り、パンデミック期に近い水準。
- 米国では2023年にだけでも422店の独立書店が新規オープンし、Barnes & Noble も復調の兆し。

2. **読書量の統計は微減程度**
- Gallup の調査では、年間11冊以上読む「メガリーダー」が1‑5冊に減少したが、過去30年で大きなトレンドは認められない。
- National Endowment for the Arts のデータは、読者率が2012年の55%から2022年は49%へわずかに低下。
- American Time Use Survey でも2003〜2023年の読書時間はやや減少。

3. **デジタル依存の伸びは鈍化**
- ソーシャルメディア利用はピークを過ぎ、時間は減少傾向。
- アプリ開発者はユーザーの注意を引き続けるのが難しくなっている。

4. **読書は過去のメディア侵入を乗り越えてきた**
- ラジオ、テレビ、インターネット、TikTok などの登場にもかかわらず、紙の文字への欲求は残存。
- 最も中毒性の高いデバイスを持つ人々でも、時折デバイスをオフにして本を手に取ることは「奇跡的」だ。

結論として、読書の衰退は「大きな問題」かどうかは個人の評価次第であり、今後も停滞か回復の可能性があるとマストロイアニは主張している。ニュースヘッドラインが描く「読書の死」は、実際の統計と比べて過度に悲観的である。
Has the rise of hyper-addictive digital technologies really shattered our attention spans and driven books out of our culture? Maybe not, argues social psychologist Adam Mastroianni (author of the Substack Experimental History): As a psychologist, I used to study claims like these for a living, so I know that the mind is primed to believe narratives of decline. We have a much lower standard of evidence for "bad thing go up" than we do for "bad thing go down." Unsurprisingly, then, stories about the end of reading tend to leave out some inconvenient data points. For example, book sales were higher in 2025 than they were in 2019, and only a bit below their high point in the pandemic. Independent bookstores are booming, not busting; at least 422 new indie shops opened in the United States last year alone. Even Barnes & Noble is cool again. The actual data on reading, meanwhile, isn't as apocalyptic as the headlines imply. Gallup surveys suggest that some mega-readers (11+ books per year) have become moderate readers (1-5 books per year), but they don't find any other major trends over the past three decades. Other surveys document similarly moderate declines. For instance, data from the National Endowment for the Arts finds a slight decrease in the percentage of U.S. adults who read any book in 2022 (49%) compared to 2012 (55%). And the American Time Use Survey shows a dip in reading time from 2003 to 2023. Ultimately, the plausibility of the "death of reading" thesis depends on two judgment calls. First, do these effects strike you as big or small...? The second judgment call: Do you expect these trends to continue, plateau, or even reverse...? There are signs that the digital invasion of our attention is beginning to stall. We seem to have passed peak social media — time spent on the apps has started to slide. App developers are finding it harder and harder to squeeze more attention out of our eyeballs, and it turns out that having your eyeballs squeezed hurts, so people aren't sticking around for it... Fact #2: Reading has already survived several major incursions, which suggests it's more appealing than we thought. Radio, TV, dial-up, Wi-Fi, TikTok — none of it has been enough to snuff out the human desire to point our pupils at words on paper... It is remarkable, even miraculous, that people who possess the most addictive devices ever invented will occasionally choose to turn those devices off and pick up a book instead. The author mocks the "death of reading" hypothesis for implying that all the world's avid readers "were just filling time with great works of literature until TikTok came along."

Read more of this story at Slashdot.

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