It looks like if Nutrisystem doesn't say anything about the problem, then it magically doesn't exist somehow. The Vive Pro will become available in the next few months, but there's no word yet on pricing. I need to know how to continue after the first week. The views expressed in the contents above are those of our users and do not necessarily reflect the views of MailOnline. Eventual confirmation of the phenomenon of neutrino oscillation led to two Nobel prizes, to Raymond Davis, Jr. The best all in one wireless speaker you'll ever hear: Price and availability have not been announced.
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If their mass is greater than half the Z-boson's mass, they would not be a decay product. Therefore, heavy sterile neutrinos would have a mass of at least The existence of such particles is in fact hinted by experimental data from the LSND experiment. On the other hand, the currently running MiniBooNE experiment suggested that sterile neutrinos are not required to explain the experimental data,  although the latest research into this area is on-going and anomalies in the MiniBooNE data may allow for exotic neutrino types, including sterile neutrinos.
According to an analysis published in , data from the Wilkinson Microwave Anisotropy Probe of the cosmic background radiation is compatible with either three or four types of neutrinos. If this were discovered the two could no longer be mutual antiparticles, and each of the resulting six distinct neutrinos would have no distinct antiparticle partner.
Before neutrinos were found to oscillate, they were generally assumed to be massless, propagating at the speed of light. According to the theory of special relativity , the question of neutrino velocity is closely related to their mass: Due to their tiny mass, the predicted speed is extremely close to the speed of light in all experiments, and current detectors are not sensitive to the expected difference.
Also some Lorentz-violating variants of quantum gravity might allow faster-than-light neutrinos. In the early s, first measurements of neutrino speed were done using pulsed pion beams produced by pulsed proton beams hitting a target. The pions decayed producing neutrinos, and the neutrino interactions observed within a time window in a detector at a distance were consistent with the speed of light. The central value of 1. A similar observation was made, on a much larger scale, with supernova A SN A.
So far, all measurements of neutrino speed have been consistent with the speed of light. The results showed the same faster-than-light speed. An independent recreation of the experiment in the same laboratory by ICARUS found no discernible difference between the speed of a neutrino and the speed of light. The Standard Model of particle physics assumed that neutrinos are massless. The experimentally established phenomenon of neutrino oscillation, which mixes neutrino flavour states with neutrino mass states analogously to CKM mixing , requires neutrinos to have nonzero masses.
Enhancing the basic framework to accommodate their mass is straightforward by adding a right-handed Lagrangian. The strongest upper limit on the masses of neutrinos comes from cosmology: A much more stringent constraint comes from a careful analysis of cosmological data, such as the cosmic microwave background radiation, galaxy surveys , and the Lyman-alpha forest. McDonald for their experimental discovery of neutrino oscillations, which demonstrates that neutrinos have mass.
In , research results at the Super-Kamiokande neutrino detector determined that neutrinos can oscillate from one flavor to another, which requires that they must have a nonzero mass. This is because neutrino oscillations are sensitive only to the difference in the squares of the masses. A number of efforts are under way to directly determine the absolute neutrino mass scale in laboratory experiments.
On 31 May , OPERA researchers observed the first tau neutrino candidate event in a muon neutrino beam, the first time this transformation in neutrinos had been observed, providing further evidence that they have mass. If the neutrino is a Majorana particle , the mass may be calculated by finding the half-life of neutrinoless double-beta decay of certain nuclei. Standard Model neutrinos are fundamental point-like particles, without any width or volume.
Since the neutrino is an elementary particle it does not have a size in the same sense as everyday objects. The electron neutrino cross section is 3. These scattering cross sections depend on no other properties than the masses of the corresponding charged leptons.
Properties associated with conventional "size" are absent: Experimental results show that nearly all produced and observed neutrinos have left-handed helicities spins antiparallel to momenta , and all antineutrinos have right-handed helicities, within the margin of error. These are the only chiralities included in the Standard Model of particle interactions. It is possible that their counterparts right-handed neutrinos and left-handed antineutrinos simply do not exist.
If they do, their properties are substantially different from observable neutrinos and antineutrinos. It is theorized that they are either very heavy on the order of GUT scale —see Seesaw mechanism , do not participate in weak interaction so-called sterile neutrinos , or both. The existence of nonzero neutrino masses somewhat complicates the situation. Neutrinos are produced in weak interactions as chirality eigenstates.
Chirality of a massive particle is not a constant of motion; helicity is, but the chirality operator does not share eigenstates with the helicity operator. This does not significantly affect the experiments, because neutrinos involved are nearly always ultrarelativistic, and thus mixing amplitudes are vanishingly small. Effectively, they travel so quickly and time passes so slowly in their rest-frames that they do not have enough time to change over any observable path.
An unexpected series of experimental results for the rate of decay of heavy highly charged radioactive ions circulating in a storage ring has provoked theoretical activity in an effort to find a convincing explanation. The rates of weak decay of two radioactive species with half lives of about 40 s and s are found to have a significant oscillatory modulation , with a period of about 7 s. As the decay process produces an electron neutrino , some of the proposed explanations for the observed oscillation rate invoke neutrino properties.
Initial ideas related to flavour oscillation were met with skepticism. Nuclear reactors are the major source of human-generated neutrinos. The antineutrino energy spectrum depends on the degree to which the fuel is burned plutonium fission antineutrinos on average have slightly more energy than those from uranium fission , but in general, the detectable antineutrinos from fission have a peak energy between about 3.
The ND detector has been proposed as a viable safeguard unit. Some particle accelerators have been used to make neutrino beams. The technique is to collide protons with a fixed target, producing charged pions or kaons. These unstable particles are then magnetically focused into a long tunnel where they decay while in flight. Because of the relativistic boost of the decaying particle, the neutrinos are produced as a beam rather than isotropically.
Efforts to construct an accelerator facility where neutrinos are produced through muon decays are ongoing. Nuclear weapons also produce very large quantities of neutrinos. Fred Reines and Clyde Cowan considered the detection of neutrinos from a bomb prior to their search for reactor neutrinos; a fission reactor was recommended as a better alternative by Los Alamos physics division leader J.
Neutrinos are produced together with the natural background radiation. In particular, the decay chains of U and Th isotopes, as well as 40 K , include beta decays which emit antineutrinos. These so-called geoneutrinos can provide valuable information on the Earth's interior. Atmospheric neutrinos result from the interaction of cosmic rays with atomic nuclei in the Earth's atmosphere , creating showers of particles, many of which are unstable and produce neutrinos when they decay.
Solar neutrinos originate from the nuclear fusion powering the Sun and other stars. The details of the operation of the Sun are explained by the Standard Solar Model. The Sun sends enormous numbers of neutrinos in all directions. The neutrino signal from the supernova arrived at earth several hours before the arrival of the first electromagnetic radiation, as expected from the evident fact that the latter emerges along with the shock wave.
The exceptionally feeble interaction with normal matter allowed the neutrinos to pass through the churning mass of the exploding star, while the electromagnetic photons were slowed. Because neutrinos interact so little with matter, it is thought that a supernova's neutrino emissions carry information about the innermost regions of the explosion.
Much of the visible light comes from the decay of radioactive elements produced by the supernova shock wave, and even light from the explosion itself is scattered by dense and turbulent gases, and thus delayed. The neutrino burst is expected to reach Earth before any electromagnetic waves, including visible light, gamma rays, or radio waves.
The exact time delay of the electromagnetic waves' arrivals depends on the velocity of the shock wave and on the thickness of the outer layer of the star. The Supernova Early Warning System project uses a network of neutrino detectors to monitor the sky for candidate supernova events; the neutrino signal will provide a useful advance warning of a star exploding in the Milky Way. Although neutrinos pass through the outer gases of a supernova without scattering, they provide information about the deeper supernova core with evidence that here, even neutrinos scatter to a significant extent.
In a supernova core the densities are those of a neutron star which is expected to be formed in this type of supernova ,  becoming large enough to influence the duration of the neutrino signal by delaying some neutrinos. In addition to the detection of neutrinos from individual supernovae, it should also be possible to detect the diffuse supernova neutrino background , which originates from all supernovae in the Universe.
The energy of supernova neutrinos ranges from a few to several tens of MeV. The sites where cosmic rays are accelerated are expected to produce neutrinos that are at least one million times more energetic, produced from turbulent gaseous environments left over by supernova explosions: The origin of the cosmic rays was attributed to supernovas by Walter Baade and Fritz Zwicky ; this hypothesis was refined by Vitaly L.
Ginzburg and Sergei I. Syrovatsky who attributed the origin to supernova remnants, and supported their claim by the crucial remark, that the cosmic ray losses of the Milky Way is compensated, if the efficiency of acceleration in supernova remnants is about 10 percent. Ginzburg and Syrovatskii's hypothesis is supported by the specific mechanism of "shock wave acceleration" happening in supernova remnants, which is consistent with the original theoretical picture drawn by Enrico Fermi , and is receiving support from observational data.
The very-high-energy neutrinos are still to be seen, but this branch of neutrino astronomy is just in its infancy. Indeed, the collisions of cosmic rays are supposed to produce charged pions, whose decay give the neutrinos, and also neutral pions, whose decay give gamma rays: Still-higher-energy neutrinos, resulting from the interactions of extragalactic cosmic rays, could be observed with the Pierre Auger Observatory or with the dedicated experiment named ANITA.
It is thought that, just like the cosmic microwave background radiation left over from the Big Bang , there is a background of low-energy neutrinos in our Universe. In the s it was proposed that these may be the explanation for the dark matter thought to exist in the universe. Neutrinos have one important advantage over most other dark matter candidates: This idea also has serious problems. From particle experiments, it is known that neutrinos are very light. This means that they easily move at speeds close to the speed of light.
For this reason, dark matter made from neutrinos is termed " hot dark matter ". The problem is that being fast moving, the neutrinos would tend to have spread out evenly in the universe before cosmological expansion made them cold enough to congregate in clumps. This would cause the part of dark matter made of neutrinos to be smeared out and unable to cause the large galactic structures that we see.
These same galaxies and groups of galaxies appear to be surrounded by dark matter that is not fast enough to escape from those galaxies. Presumably this matter provided the gravitational nucleus for formation.
This implies that neutrinos cannot make up a significant part of the total amount of dark matter. Although their density is quite high, they have not yet been observed in the laboratory, as their energy is below thresholds of most detection methods, and due to extremely low neutrino interaction cross-sections at sub-eV energies.
In contrast, boron-8 solar neutrinos—which are emitted with a higher energy—have been detected definitively despite having a space density that is lower than that of relic neutrinos by some 6 orders of magnitude. Neutrinos cannot be detected directly, because they do not ionize the materials they are passing through they do not carry electric charge and other proposed effects, like the MSW effect, do not produce traceable radiation.
A unique reaction to identify antineutrinos, sometimes referred to as inverse beta decay , as applied by Reines and Cowan see below , requires a very large detector to detect a significant number of neutrinos. All detection methods require the neutrinos to carry a minimum threshold energy. So far, there is no detection method for low-energy neutrinos, in the sense that potential neutrino interactions for example by the MSW effect cannot be uniquely distinguished from other causes.
Neutrino detectors are often built underground to isolate the detector from cosmic rays and other background radiation. Antineutrinos were first detected in the s near a nuclear reactor. Reines and Cowan used two targets containing a solution of cadmium chloride in water. Two scintillation detectors were placed next to the cadmium targets. Pairs of photons in coincidence could be detected by the two scintillation detectors above and below the target.
Since then, various detection methods have been used. Super Kamiokande is a large volume of water surrounded by photomultiplier tubes that watch for the Cherenkov radiation emitted when an incoming neutrino creates an electron or muon in the water. The Sudbury Neutrino Observatory is similar, but uses heavy water as the detecting medium, which uses the same effects, but also allows the additional reaction any-flavor neutrino photo-dissociation of deuterium, resulting in a free neutron which is then detected from gamma radiation after chlorine-capture.
Other detectors have consisted of large volumes of chlorine or gallium which are periodically checked for excesses of argon or germanium , respectively, which are created by electron-neutrinos interacting with the original substance. The University of Liverpool ND detector employs the novel use of gadolinium encased light detectors in a temperature controlled magnetic field capturing double light pulse events.
The T2K experiment developed the technology and practical experiments were successful in both Japan and at Wylfa power station.
Neutrinos' low mass and neutral charge mean they interact exceedingly weakly with other particles and fields. This feature of weak interaction interests scientists because it means neutrinos can be used to probe environments that other radiation such as light or radio waves cannot penetrate.
Using neutrinos as a probe was first proposed in the midth century as a way to detect conditions at the core of the Sun. The solar core cannot be imaged directly because electromagnetic radiation such as light is diffused by the great amount and density of matter surrounding the core.
On the other hand, neutrinos pass through the Sun with few interactions. Whereas photons emitted from the solar core may require 40, years to diffuse to the outer layers of the Sun, neutrinos generated in stellar fusion reactions at the core cross this distance practically unimpeded at nearly the speed of light. Thank you Allison for being pleasant and helpful. Thank you for the kind words! We will be sure to pass this compliment onto Allison. Keep up the excellent work on the program, Chris!
I didn't know this when I originally call to cancel my account. Not that I like it, I understand that it was to be paid now. I was on hold for several minutes and when he finally came back he proceeded to tell me that his supervisor was at lunch and would called me back when she returned, "Oh and by the way here's your confirmation for your cancellation". At that time I received an email from my PayPal account, advising me that I just made a payment to Nutrisystem.
The man had the nerve to charge my account while he had me on hold. I have called every day, each rep has told me what he did was ok. This is so sad, that he could do this behind my back and it be ok. My call is being reviewed now sure it is but, we all know how this is going to end. I will continue to call each day until I get a callback. He knew what he was doing was wrong, why else would he have to sneak and charge me. I want an apology and someone to tell me what he did was wrong! If I were Marie Osmond, I wouldn't want to be known as a spokesperson for a company that has such bad reviews.
BBB alone has 99 bad reviews and I am getting ready to add another. I guess that wasn't necessary to be said. We are sad to hear about the way you were treated when calling. This is NOT okay. After the 3rd call to NutriSystem about a late order, Beth finally came online and made a return customer — yet again — out of me.
We are so happy to hear that Beth was able to straighten things out for you. We wish you continued success on and off the program. Rachel was very helpful in helping me to better understand my needs while on the plan and I am very thankful for her professionalism. So far I am enjoying being on Nutrisystem. All of the food does taste very good. The only negative thing is that when I first order they did not tell me that there was so much chocolate in the turbo box.
I specifically requested no chocolate. Maybe training is advisable for people helping people to order food. Thank you very much. We are so happy that Rachel was able to help you get started on the program. We are sorry that you received so much chocolate after requesting no chocolate.
We will be sure to pass this along for coaching. Best wishes as you continue on the program. I have been overcharged. Counselors at Nutrisystem keep telling me the issue has been addressed but I do not receive a refund.
This is very upsetting and seems to me to be a bit fraudulent. Please refund my money! We are sorry to hear the NuMi promotion fell off after placing the order. I have been on the Women's Uniquely Yours Program for 13 months, and have lost over 90 pounds. The frozen food is amazing, and I was never hungry or felt deprived.
The delicious snacks and double chocolate muffins have kept me satisfied and I never felt deprived. Thank you for the kind words and keep up the awesome work! Canadian turkey bacon egg and cheese muffin missing cheese - Thank you for the response.
I did not to think to take a picture of the back with the information. If this occurs on the next I will. The cheese was missing on two of the sandwiches out of four on this order.
I was trying to explain to the last counselor that I spoke to what was happening to me with eating the food and that it was making me sick. This is not in regards to Kim in returns. Kim was helpful and very nice to me. Anyway, the last counselor I spoke to was so rude and talked over me and would not let me finish my sentence.
It's really upsetting that I did not write her name down. It would be the counselor that I spoke to before I spoke to Kim. We are so sorry that you had such a poor experience. We will definitely be looking into this and reaching out soon. I had a question about my food. Chat with your counselor. Very helpful but our chat was interrupted. I need to know how to continue after the first week.
I am still confused on how to continue after the first week. Thank you for reaching out. We will be assigning this to a member of the Consumer Experience team to reach out and assist you. The quality of food was pretty good with several options to choose from.
Unfortunately when they were out of stock they substituted other food! Changing your plan such as delivery frequency was very difficult and why I left. Thank you for the feedback. We are sorry that you left for those reason. We will be reaching out to get further information.
Have a good one! Over the last several months, I have tried over and over to resolve an ongoing problem with order fulfillment. Customer service refused to help and refused my repeated requests to escalate the issue and finally Nutrisystem decided to dump me. Even in my last e-mail communication with Nutrisystem where I yet again outlined the problem, the reply back from Nutrisystem completely ignored the majority of what I wrote.
It looks like if Nutrisystem doesn't say anything about the problem, then it magically doesn't exist somehow. This shows that Nutrisystem has drastically fallen in terms of focusing on customer needs and flat out refuses to deal ethically with the customer. We sincerely apologize for your experience. We certainly do not want a long-time member to feel such a way. We will be investigating this and reaching out soon. I have had a couple questions for your people there and I emailed them for a answer.
First reply was very fast, second was a bit slower but they explained to me the reason why. I have been very satisfied with everything from Nutrisystem!!! Thank you for your patience and understanding.
We are happy to hear you got the answers you needed. We wish you the best of luck on the program! This is the 2nd time I've been on the NutriSystem plan. First time was a hit. Lost almost all my weight and kept it off for over a year. Just a little more weight to lose so I ordered again for 2 months. First shipment arrived on time and the food was terrific. Second shipment has the frozen food arrive a couple days late. The 2nd shipment of non frozen food is still not here after being over a week, now almost a week and a half late.
How am I to stay on the regiment with half the menu missing for over a week? My assistant called NS as she ordered for me and asked for help—reimbursement— compensation of some sort.
The reply from Nutri system? I even referred you to my sister and brother in law— who both signed up. We apologize that your 2nd order took longer than expected to get to you. We completely understand how this can throw someone off. We will be looking into this and reaching out. I sincerely appreciate all the help that Sheila offered. I won't hesitate to contact your Team Rep should I have other questions.
See three emails I've previously sent. You don't honor your own company's policies. Food was extremely poorly packed, melted and opened packaging. We are sorry that you had such a poor experience with us. We will be taking a look at your account and reaching out shortly. Customers can benefit from an online health tracking platform and individualized counseling from dieticians and weight loss coaches. Nutrisystem offers separate plans for men and women, with different options and price points customized to your weight loss goals.
With meals containing 12 grams or less of sugar, Nutrisystem takes the guesswork out of choosing optimal low-glycemic foods to stabilize blood sugar -- which could be good for people with any degree of insulin resistance. Any busy person who does not have time to prepare their own meals would benefit from having frozen and other pre-packaged meals and snacks delivered to their home. Nutrisystem will ship all the food you need to your doorstep, with free shipping included.
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