Scientific Discovery of "Rare Nuclear-Fusion Violating-Charge-Symmetry"!

Science Daily ^ | 4-8-2003 | Editorial Staff

[vannrox]

Indiana University Scientists First To Detect Rare Nuclear Fusion Violating Charge Symmetry

BLOOMINGTON, Ind. -- Scientists at the Indiana University Cyclotron Facility in Bloomington have made the first unambiguous detection of a rare process, the fusion of two nuclei of heavy hydrogen to form a nucleus of helium and an uncharged pion. The pion is one of the subatomic particles responsible for the strong force that holds every nucleus together. The achievement will be announced Saturday (April 5) at the meeting of the American Physical Society in Philadelphia.

"Scientists have searched for this rare fusion process since the 1950s," said IU physicist Edward Stephenson, the leader of the research team. "The process would not happen at all if nature did not allow a small violation of what is known as charge symmetry. If this symmetry violation had happened to be in the other direction, hydrogen would not have survived after the Big Bang, and the universe would not have the hydrogen fuel that keeps stars shining, including our sun, making human life possible. Sometimes large consequences hang on delicate balances in nature."

One effect of this charge symmetry violation is that the neutron is slightly heavier than its charged partner, the proton. As a result, isolated neutrons decay into protons in about 10 minutes. "If the charge symmetry violation had been in the other direction instead, and if the proton had been heavier than the neutron by the same slight amount, protons would have decayed into neutrons and hydrogen could not have survived," Stephenson explained.

The rate at which the rare fusion process occurs is expected to be a key piece of information in finding the cause for this violation of charge symmetry, he said. Theorists have proposed that the violation originates with quarks, the small particles that are found inside protons and neutrons.

"The rate of the process will tell scientists how much of the violation comes from the fact that quarks carry small electrical charges, and how much comes from the difference in mass between the two types of quarks found inside neutrons and protons," Stephenson said.

The IU team used the electron-cooled storage ring at the cyclotron laboratory to focus a beam of heavy hydrogen onto a target of the same material. The high precision of the beam allowed them to use just enough energy to make the uncharged pion without producing unwanted heavier particles. Sensitive detectors tracked the helium nuclei and captured the two photons or particles of light that are produced when the pion decays.

The team worked around the clock for two months, seeing at most only five of the rare events per day, Stephenson said. However, the several dozen events that they collected will be enough to allow scientists to test their theories about the violation of charge symmetry.

Their research was supported by a grant from the National Science Foundation.

Note: This story has been adapted from a news release issued for journalists and other members of the public. If you wish to quote any part of this story, please credit Indiana University as the original source. You may also wish to include the following link in any citation:

http://www.sciencedaily.com/releases/2003/04/030409075535.htm

[vannrox]

Cool and exciting!

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[muawiyah]

Go Big Red!

[PokeyJoe]

I'm physics challenged.

With this information, the scientists hope to . . .

develop a fusion engine, like the one in Back To The Future

or . . .

[Gary Boldwater]

*PINK MATTER ALERT*

[BenLurkin]

"Where we're going, we wont need any roads!"

[JeepInMazar]

Scientists at the Indiana University Cyclotron Facility in Bloomington have made the first unambiguous detection of a rare process, the fusion of two nuclei of heavy hydrogen to form a nucleus of helium and an uncharged pion.

This is not big deal, I've been seeing this and thinkikng about it for quite some time now. < /joke >

[VadeRetro]

As a result, isolated neutrons decay into protons in about 10 minutes.

An oddly incomplete description of this decay. Most accounts say a free neutron decays to yield a proton, an electron, and a neutrino. In fact, it was the variable energy sum from the easily observable parts of this decay (the proton and the electron) that led to the hypothesis that something harder to observe (the neutrino) must be in the mix as well. It was the first hint scientists had that neutrinos even exist.

The usual description of proton decay does not violate something called the conservation of electric charge. The writer of the article seems unaware of any such law.

[aruanan]

The pion is one of the subatomic particles responsible for the strong force that holds every nucleus together.

I thought the pion was one of the things responsible for the force that holds every Latin American authoritarian social structure together.

[farmfriend]

Science ping.

[Carry_Okie]

blam...!

[blam]

"blam...!"

WHAT?

(My son FReeper 'Charge Carrier' is the physicist in the family)

[Carry_Okie]

ok, so it was a little blam, um... IIRC, that was BlamBlam.

WILMAAAAA!

[Libertarianize the GOP]

http://www.freerepublic.com/perl/bump-list

[blam]

"ok, so it was a little blam, um... IIRC, that was BlamBlam. "

Dr blam. (PhD physics)

[Doctor Stochastic]

The whole thing with neutrons and neutrions is enlightening. The existance of the neutron was hypothesized in the 1920s (I think) to explain atomic weights and alpha decay. The neutrino was hypothesized to explain beta decay having a continuous spectrum. During the late 1920s, there were two unseen (dark matter like) particles that were thought to exist. Both were found later.

[Boiler Plate]

In fact, it was the variable energy sum from the easily observable parts of this decay (the proton and the electron) that led to the hypothesis that something harder to observe (the neutrino) must be in the mix as well. It was the first hint scientists had that neutrinos even exist.

No, there is a slight inbalance in that equation that has desribed the K(Ee)^2 term as negligible. Perhaps it is not negligible after all.

Regards,
Boiler Plate

[Nucluside]

Bump!

[SunkenCiv]

ping

[SunkenCiv]

Note: this topic is from April 9, 2003.

Scientists at the Indiana University Cyclotron Facility in Bloomington have made the first unambiguous detection of a rare process, the fusion of two nuclei of heavy hydrogen to form a nucleus of helium and an uncharged pion. The pion is one of the subatomic particles responsible for the strong force that holds every nucleus together... "Scientists have searched for this rare fusion process since the 1950s," said IU physicist Edward Stephenson, the leader of the research team. "The process would not happen at all if nature did not allow a small violation of what is known as charge symmetry. If this symmetry violation had happened to be in the other direction, hydrogen would not have survived after the Big Bang, and the universe would not have the hydrogen fuel that keeps stars shining, including our sun, making human life possible. Sometimes large consequences hang on delicate balances in nature." One effect of this charge symmetry violation is that the neutron is slightly heavier than its charged partner, the proton. As a result, isolated neutrons decay into protons in about 10 minutes... The rate at which the rare fusion process occurs is expected to be a key piece of information in finding the cause for this violation of charge symmetry, he said.

• Radioactive Decay Not Always Constant? [8/08/2006]
• Surprise To Physicists -- Protons Aren't Always Shaped Like A Basketball! [4/08/2003]
• Physics: Proton radius smaller than believed, European scientists say [7/07/2010]
• The proton - smaller than thought [7/12/2010]

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