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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)で25年にわたって稼働した相対論的重イオン衝突型加速器(RHIC)が2026年2月6日、最後の衝突を終えて閉鎖されました。**

- **歴史と成果**
- 2000年に本格運転開始。金イオン同士の衝突で初めて200 GeV/核のエネルギーを実現(2001年)。
- 2002年に新種の物質候補、2010年には4兆度(約4 × 10¹² K)という史上最高温度のプラズマを生成しギネス記録に認定。
- プロトンスピン問題の解消、最も重く複雑な反物質の生成、ビッグバン直前のクォーク・グルオン・プラズマ(QGP)を液体様に観測するなど、素粒子・核物理の最前線を牽引。
- 最終走行では「仮想粒子」の直接観測という新たな量子真空の探査結果が得られ、数百ペタバイト規模のデータが蓄積された。

- **閉鎖の経緯**
- 米エネルギー省(DOE)科学担当副長官ダリオ・ジル氏が赤いボタンを押し、感慨深い拍手とともにRHICの運転が終了。
- 「寂しいが、もっと優れた装置を建てる」という期待が示された。

- **次世代装置:電子・イオン衝突型加速器(EIC)**
- RHICの地下リングの一部を流用し、約10年かけて新たに建設予定。
- 電子ビームを用いてイオンを「ナイフ」のように切り込み、クォークとグルオンの構造をより高精度で探査できる。
- 米国で初の新規粒子加速器となり、欧州・アジアに遅れを取っていた米国粒子物理学の再興を象徴。

**結論**
RHICは「唯一の米国内ヘビーレイオン対向衝突装置」として、素粒子物理学に革命的知見をもたらした。その科学遺産は膨大なデータとして残り、次世代EICへと受け継がれることで、今後も米国が世界の最前線で研究を続ける基盤となる。
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)**

約50年にわたって「もっと運動しろ」と呼びかけてきたが、最新の研究はその考え方が間違っている可能性を示している。米国や世界保健機関(WHO)のガイドラインは、もはや「中程度」や「激しい」有酸素運動の最低時間を指定しなくなった。代わりに重要視されているのは**「VILPA」**(Vigorous Intermittent Lifestyle Physical Activity)―日常生活の中で短時間・高強度の動きを取り入れることだ。

- **研究結果**
- 30秒程度の短いバーストでも、ジムでの運動と同等の健康効果が得られる。
- 1日数分、階段を2〜3段上がり下りするだけで、体重低下や脳の老化抑制、心筋梗塞・脳卒中リスクの低減が期待できる。
- 英国の非運動者を対象とした2022年の研究では、1日たった4分(階段数本)でも有意な健康改善が確認された。
- 米国の別研究では、同様の「日常的な高強度」活動が死亡率を44%減少させたと報告された。

- **実践のポイント**
1. **時間より強度**:軽く息が上がる程度ではなく、会話が続かないほどの「息切れ」レベルを目指す。
2. **日常に組み込む**:計画的なトレーニングではなく、階段の上り降りや急いで歩くなど、生活の合間に取り入れる。
3. **段階的に増やす**:最初は1~2分から始め、慣れたら徐々に時間や回数を増やす。

- **結論**
「運動は長時間続けなければ効果がない」―という従来の常識は見直すべきである。短時間でも**高強度**のインターバルを日常に散りばめるだけで、寿命延長や生活習慣病予防に大きく寄与する。すべての動きが価値ある「VILPA」になるというメッセージが、最新の科学的エビデンスとして提示されている。
"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)**

米国の小型モジュール原子炉(SMR)市場が、ビッグテック企業の参入で転換点を迎えていると Fortune が報じた。

- **Meta の動き**
- 2024年1月、Meta はビル・ゲイツが率いる TerraPower と、サム・アルトマンが支援するスタートアップ Oklo と提携し、総計約 4 GW(約300万世帯分)の SMR プロジェクトを開始。
- 目的は、オハイオ州に建設予定の「Prometheus」AIキャンパスや、同社のデータセンター群にクリーンで安定した電力を供給すること。

- **業界アナリストの見解**
- Wedbush Securities の Dan Ives 氏は、Meta の取引を「警告の第一発射」とし、2026年までに他のビッグテック(Google、Amazon、Microsoft など)も核エネルギーへ参入する可能性が高いと予測。
- 米国では新規データセンターの建設件数が既存施設を上回っており、2050 年までに大規模な電力需要増が見込まれる。核エネルギーがその解決策になると指摘。

- **SMR の特長**
- 従来の大型原子炉に比べ、建設期間が約3年と短縮可能。
- モジュール単位で段階的に増設でき、データセンター運営者(いわゆる「ハイパースケーラー」)の需要に柔軟に対応できる。

- **Oklo CEO のコメント**
- Jacob DeWitte 氏は、排出ゼロのベースロード電力が不可欠であり、核が実現しなければ大きなリスクになると警鐘を鳴らす。
- ハイパースケーラーは電力需要の最終消費者として、市場の拡大と核プロジェクトの実現に重要な役割を果たすと強調。

- **今後の展望**
- 2030 年を「規模拡大のターニングポイント」と位置付け、米国で次世代核エネルギー時代が本格化する見込み。
- ビッグテックの資金力と技術力が、SMR の商業化・普及を加速させる可能性が高い。

**結論**
Meta の核プロジェクト参入は、ビッグテックがエネルギー供給に直接関与し始めた象徴的な事例であり、SMR がデータセンターの急増する電力需要を満たす実用的な手段として注目されている。2026 年以降、他の大手テック企業も核エネルギーへの投資や提携を進め、2030 年までに米国の核発電が新たな成長段階に入ることが予想される。
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は最新AIモデル **Claude Opus 4.6** を公開し、同モデルを「フロンティア・レッドチーム」のサンドボックス環境でテストしたところ、**500件以上の未発見・高深刻度ゼロデイ脆弱性** を自動で検出したことを発表しました。

- **検出手法**:特別な指示やチューニングを行わず、モデルの「アウト・オブ・ザ・ボックス」機能だけでオープンソースコードを解析。
- **検証**:すべての脆弱性はAnthropic社内のメンバーまたは外部のセキュリティ研究者により実際に確認済み。
- **代表的な脆弱性例**
- *GhostScript*(PDF/PostScript処理ユーティリティ)のクラッシュ脆弱性
- *OpenSC*(スマートカードデータ処理)でのバッファオーバーフロー
- *CGIF*(GIF処理ツール)でのバッファオーバーフロー

**意義と今後の展望**
Redチーム責任者のLogan Grahamは、AIが脆弱性発見に「極めて優秀」であり、今後はAI駆動のツールがオープンソースソフトウェアの主要な防御手段になる可能性があると指摘しています。これにより、サイバー防御側の支援が大幅に向上する一方で、同様のAI技術が攻撃側にも利用されるリスクも示唆されています。
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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