Fusione a freddo realizzata?

[yurj]

http://www.christiansciencemonitor.c...5s01-stss.html

Scientists have gotten fusion to occur in the laboratory before, but for the most part, they've tried to mimic conditions inside the sun by whipping hydrogen gas up to extreme temperatures or slamming atoms together in particle accelerators. Both of those options require huge energies and gigantic equipment, not the sort of stuff easily available to build a generator. Is there any way of getting protons close enough together for fusion to occur that doesnt require the energy output of a large city to make it happen?

The answer, it turns out, is yes.

Instead of using high temperatures and incredible densities to ram protons together, the scientists at UCLA cleverly used the structure of an unusual crystal.

Crystals are fascinating things; the atoms inside are all lined up in a tightly ordered lattice, which creates the beautiful structure we associate with crystals. Sometimes those orderly atoms create neat side-effects, like piezoelectricity, which is the effect of creating an electrical charge in a crystal by compressing it. Stressing the bonds between the atoms of some crystals causes electrons to build up on one side, creating a charge difference over the body of the crystal. Other crystals do this when you heat or cool them; these are called pyroelectric crystals.

The new cold fusion experiment went something like this: scientists inserted a small pyroelectric crystal (lithium tantalite) inside a chamber filled with hydrogen. Warming the crystal by about 100 degrees (from -30 F to 45F) produced a huge electrical field of about 100,000 volts across the small crystal.

The tip of a metal wire was inserted near the crystal, which concentrated the charge to a single, powerful point. Remember, hydrogen nuclei have a positive charge, so they feel the force of an electric field, and this one packed quite a wallop! The huge electric field sent the nuclei careening away, smacking into other hydrogen nuclei on their way out. Instead of using intense heat or pressure to get nuclei close enough together to fuse, this new experiment used a very powerful electric field to slam atoms together.

Unlike some previous claims of room-temperature fusion, this one makes intuitive sense: its just another way to get atoms close enough together for the strong force to take over and do the rest. Once the reaction got going, the scientists observed not only the production of helium nuclei, but other tell-tale signs of fusion such as free neutrons and high energy radiation.

This experiment has been repeated successfully and other scientists have reviewed the results: it looks like the real thing this time.

[yurj]

4. TABLE-TOP FUSION: SMALL NEUTRON GENERATOR IS FAR FROM RECORD.
Newspapers around the country reported the amazing result that a UCLA team had demonstrated fusion of deuterium to form helium in a table-top device. They were, of course, scooped - by Ernest Rutherford, 71 years ago. Fusion is easy. A self-sustaining reaction is not. The unique feature of the UCLA device is to get the accelerating voltage from a pyroelectric crystal, which makes it quite compact. Unfortunately for civilization, there are thousands of fusion devices in the world not much bigger than a walnut. They are in every nuclear weapon to produce a pulse of neutrons at just the right time.

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Ovviamente era una notizia mal interpretata, scusate

[Creso]

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Viva la fusione a freddo, specie nei periodi secchi.