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May 2011

Volume 64, Issue 5

Cover: This hand-colored photo, taken by Thomas Jaggar in 1917, shows the lava lake inside Halemaumau crater on Hawaii's Kilauea volcano. Jaggar first visited the lava lake in 1909 and was inspired to return to Kilauea years later to start the Hawaiian Volcano Observatory, which continues to operate today. But as John Dvorak writes on page 32, the full story of the observatory's beginnings includes many twists and turns. (Image courtesy of the Hawaii Volcanoes National Park.)

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Articles

Select this Article		Polar molecules in the quantum regime Deborah S. Jin and Jun Ye


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	+ -	Show Topic With molecular gases so cold that collisions must be described quantum mechanically, researchers are studying chemical reactions as they’ve never been seen before.

Select this Article FREE		The origin of the Hawaiian Volcano Observatory John Dvorak


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	+ -	Show Topic In 1912 Thomas Jaggar left MIT to start an observatory on the remote Kilauea volcano. The move was the culmination of a tortuous chain of events.

Select this Article		The neutrino’s elusive helicity reversal Alfred Scharff Goldhaber and Maurice Goldhaber


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	+ -	Show Topic Neutrinos have tiny but nonzero masses. So their helicities can, in principle, be reversed. Detecting that reversal by chasing a neutrino seems impossible in the foreseeable future. But if neutrinos are their own antiparticles, indirect detection may be possible.

Letters

Time-symmetric quantum mechanics questioned and defended

Select this Article FREE		Time-symmetric quantum mechanics questioned and defended Michael Nauenberg


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Select this Article FREE		Time-symmetric quantum mechanics questioned and defended Art Hobson


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Select this Article		Time-symmetric quantum mechanics questioned and defended Shaul Mukamel


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Select this Article FREE		Time-symmetric quantum mechanics questioned and defended Robert B. Griffiths


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Select this Article FREE		Time-symmetric quantum mechanics questioned and defended Yakir Aharonov , Sandu Popescu, and Jeff Tollaksen


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On the reuse of US Navy reactors

Select this Article FREE		On the reuse of US Navy reactors Bill Nettles


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Select this Article FREE		On the reuse of US Navy reactors Nicolas S. Powell


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Clarifying ozone emission spectra

Select this Article FREE		Clarifying ozone emission spectra Ray Pierrehumbert


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Fixing credit for voltage measurements

Select this Article FREE		Fixing credit for voltage measurements Thomas B. Sanford


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Correction

Select this Article FREE		Correction

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Search and Discovery

Select this Article		Precision cosmic-ray data challenge a paradigm Bertram M. Schwarzschild


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	+ -	Show Topic It was long thought that almost all intragalactic cosmic rays originate in supernova remnants.

Select this Article		Calculations clarify the role of minerals’ electron spins in Earth’s mantle Johanna L. Miller


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	+ -	Show Topic Laboratory measurements of the spin states are indirect and prone to ambiguities.

Select this Article		Atoms in a BEC engineered to have spin–orbit coupling typical of electrons in a solid Barbara Goss Levi


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	+ -	Show Topic By mimicking certain electromagnetic effects, researchers can use ultracold atomic gases to simulate a wide range of many-body behavior.

Select this Article		New fiber lasers deliver pulses at tens of gigahertz R. Mark Wilson


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	+ -	Show Topic Ultrafast charge-carrier dynamics and broadband tunability make carbon nanotubes and graphene appealing materials for phase-locking cavity modes.

Physics Update

Select this Article		Tracking atoms on and off a nanoscale mass sensor Jermey N. A. Matthews


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Select this Article		Microresonators as temperature sensors Richard J. Fitzgerald


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Select this Article		An ancient meteorite recorded its changing environment Steven K. Blau


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Select this Article		Unexpected wear may yield new plasma rockets Stephen G. Benka


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Select this Article		Convection homogenizes magma intrusions Charles Day


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Issues and Events

Select this Article FREE		Safety reviews, not shutdowns, are ordered in the wake of Fukushima David Kramer


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	+ -	Show Topic The US, China, and France each have a considerable stake in the growth of nuclear power. But public opinion may have greater sway.

Select this Article		For some, helium-3 supply picture is brightening David Kramer


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	+ -	Show Topic R&D efforts are beginning to pay off in reduced demand for the scarce neutron-detection isotope. But there is little relief for those requiring it outside the US.

Select this Article FREE		US planetary sciences to focus on smaller missions, research, and technology development Toni Feder


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	+ -	Show Topic Heeding community advice, NASA’s planetary science division seeks to scale back its flagship missions while retaining strong international partnerships.

Select this Article		Bags to slags: Recycling plastics to make steel Toni Feder


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	+ -	Show Topic A researcher in Australia seeks ways to use alternative resources.

Select this Article		News Notes: Enrollment data Toni Feder


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Books

Select this Article		The Making of History’s Greatest Star Map; A Grand and Bold Thing: An Extraordinary New Map of the Universe Ushering in a New Era of Discovery Jay M. Pasachoff, Reviewer


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Select this Article		The Physics of Proteins: An Introduction to Biological Physics and Molecular Biophysics; Theoretical Molecular Biophysics H. Richard Leuchtag, Reviewer


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Select this Article		Massive: The Missing Particle That Sparked the Greatest Hunt in Science Michael E. Peskin, Reviewer


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Select this Article		Physics of Baseball and Softball Cliff Frohlich, Reviewer


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Select this Article FREE		New books


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New Products

Select this Article FREE		Focus on lasers and imaging


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Obituaries

Select this Article FREE		Owen Martin Phillips Peter Olson


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Select this Article FREE		Michael Tinkham John Clarke and Isaac Silvera


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Quick Study

Select this Article		The universe in a cup of coffee John S. Wettlaufer


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	+ -	Show Topic Your morning java or tea is a rotating, cooling laboratory that reflects the physics of such large-scale phenomena as stellar dynamics and energy transport in Earth’s atmosphere and oceans.

Select this Article		Cartesian vortex theory, cosmic vortices, and the route to cosmogony John S. Wettlaufer


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	+ -	Show Topic Supplemental material for the Quick study "The universe in a cup of coffee" PHYSICS TODAY, May 2011, page 66.