Nitrogen-15 is a rare stable isotope of nitrogen. Two sources of nitrogen-15 are the positron emission of oxygen-15[8] and the beta decay of carbon-15. Nitrogen-15 presents one of the lowest thermal neutron capture cross sections of all isotopes.[9]

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The nitrogen-13 produced as a result decays with a half-life of 9.965(4) min to carbon-13, emitting a positron. The positron quickly annihilates with an electron, producing two gamma rays of about 511 keV. After a lightning bolt, this gamma radiation dies down with a half-life of ten minutes, but these low-energy gamma rays go only about 90 metres through the air on average, so they may only be detected for a minute or so as the "cloud" of 13N and 15O floats by, carried by the wind.[7]

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Natural nitrogen (7N) consists of two stable isotopes: the vast majority (99.6%) of naturally occurring nitrogen is nitrogen-14, with the remainder being nitrogen-15. Thirteen radioisotopes are also known, with atomic masses ranging from 9 to 23, along with three nuclear isomers. All of these radioisotopes are short-lived, the longest-lived being nitrogen-13 with a half-life of 9.965(4) min. All of the others have half-lives below 7.15 seconds, with most of these being below 620 milliseconds. Most of the isotopes with atomic mass numbers below 14 decay to isotopes of carbon, while most of the isotopes with masses above 15 decay to isotopes of oxygen. The shortest-lived known isotope is nitrogen-10, with a half-life of 143(36) yoctoseconds, though the half-life of nitrogen-9 has not been measured exactly.

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I’ve heard of the “magic ear,” but never heard it called that. It’s referred to as a “chassis ear” by a lot of mechanics. I’ve never used one, but I have a story.

I have a '95 Caravan, FWD It has what I would call classic wheel bearing noise. Get it up to 45mph or so and it sounds like there’s a small engine airplane flying along with you. Turn left the noise goes away. Turn right, the noise gets worse. It sounds to me like it is in the front. (This is noise only - it doesn’t come with any vibration). Both rears had some contamination, a little play and a little noise so I just went ahead and replaced those - not having high hopes that that was the source of the noise because they were bad, but not that bad. The problem is that neither of the fronts show any signs of a bad bearing upon inspection. There is no play in the wheels, and they aren’t noisy when you spin them. Nothing is loose or rubbing. The tires are in VGC, and I moved them around with no change. The fronts bearings are the sealed hub type, and expensive, so I’m not going to replace them on a guess. The van has 217K on it & the fronts were done at some point, but it was so long ago I can’t remember - i.e. they could be due. But what else would act this way? And what might be the best way to find out?

Wheel bearingnoise test

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Nitrogen-14 is one of the very few stable nuclides with both an odd number of protons and of neutrons (seven each) and is the only one to make up a majority of its element. Each proton or neutron contributes a nuclear spin of plus or minus spin 1/2, giving the nucleus a total magnetic spin of one.

Have you checked the CV joints for problems? They typically pop and click when they go bad, but they can also make roaring sounds.

One way to check for rough bearings is, with the tire off the ground, place your hand on the strut spring. Now slowly rotate the tire. If the bearing is rough, it sometimes can be felt in strut spring.

It would respond to steering the way your’s does. I didn’t argue when they decided to replace the bearing. They were nice about it when that didn’t fix the problem and worked with me on the total repair bill when they aligned the engine and the noise stopped. I guess a mount was not isolating the engine and its vibration from the vehicle’s (Dodge Sedan) body.

The original source of nitrogen-14 and nitrogen-15 in the Universe is believed to be stellar nucleosynthesis, where they are produced as part of the CNO cycle.

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Nitrogen-14 is the source of naturally-occurring, radioactive, carbon-14. Some kinds of cosmic radiation cause a nuclear reaction with nitrogen-14 in the upper atmosphere of the Earth, creating carbon-14, which decays back to nitrogen-14 with a half-life of 5700(30) years.

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I tried my best to look at all of the suggestions here - and even did ridiculous things with a piece of hose & zip ties while test driving (the poor man’s “magic ear”/extended stethoscope). In the end I couldn’t actually verify for certain that it was the bearing.

Wheel bearingnoise when driving

Sometimes these “whats making the noise” type problems have been resolved by using the “magic ear” (microphones that clamp on components).

It’s possible to have tight wheel bearings that do not make noise when the wheels are off the ground. Apply the weight to them and it’s a different matter.

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I’m not saying that’s what wrong with your’s, but at 217K it’s worth taking a look at. Those mounts could be worn out or breaking down.

The radioisotope 16N is the dominant radionuclide in the coolant of pressurised water reactors or boiling water reactors during normal operation. It is produced from 16O (in water) via an (n,p) reaction, in which the 16O atom captures a neutron and expels a proton. It has a short half-life of about 7.1 s,[4] but its decay back to 16O produces high-energy gamma radiation (5 to 7 MeV).[4][10] Because of this, access to the primary coolant piping in a pressurised water reactor must be restricted during reactor power operation.[10] It is a sensitive and immediate indicator of leaks from the primary coolant system to the secondary steam cycle and is the primary means of detection for such leaks.[10]

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Wheel bearingsound when turning

Nitrogen-15 is frequently used in NMR (Nitrogen-15 NMR spectroscopy). Unlike the more abundant nitrogen-14, which has an integer nuclear spin and thus a quadrupole moment, 15N has a fractional nuclear spin of one-half, which offers advantages for NMR such as narrower line width.

Sorry oldschool - I thought my initial mention of it spoke for itself. I should have added that I am going to rig up a chunk of hose to my stethoscope.

I’ve experienced front bearing failure and noise that could not be felt by spinning the unloaded wheel or rocking the wheel at the 0/180 position. It made plenty of noise going down the road, though.

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Nitrogen-13 and oxygen-15 are produced in the atmosphere when gamma rays (for example from lightning) knock neutrons out of nitrogen-14 and oxygen-16:

I had no idea that a “magic ear” was a thing - though I’d considered a low tech equivalent - just running a long piece of vacuum hose out & under attached to my stethoscope. I guess its not as nuts as I thought.

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A former co-worker did a front brake job on a mid '90s Buick LeSabre, including replacing the rubber caliper bushings. He forgot to install one of the bushings and sent the car out the door. Needless to say, the customer experienced a loud clunk every time she stepped on the brakes, so she took it to a Buick dealership, which used a “chassis ear” to find the glaringly obvious problem. They charged the customer $120 per hour to use the “chassis ear” on the car for two hours, then charged $130 to install a $2 bushing in the caliper (a five minute job). How they missed that problem installing the microphones is beyond me, why they had to test drive the car for two hours is even further beyond me, and why the customer didn’t bring the car right back to us is also beyond me, but not as much as this tale of either inordinate ignorance on the dealership’s part, or a complete and utter ripoff. All told, we had to reimburse the customer about $400 to have the Buick dealership perform a diagnosis that any reasonable mechanic could have diagnosed in the parking lot and fixed in ten minutes for $20 or less.