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o 5 2 14 1 141 5 9 2 7 2 displaystyle 9 2 to 7 2 3 2 130 6 9 2 7 2 displaystyle 9 2 to 7 2 27 6 99 8 9 2 9 2 displaystyle 9 2 to 9 2 38 8 88 6 9 2 9 2 displaystyle 9 2 to 9 2 81 5 45 9 9 2 11 2 displaystyle 9 2 to 11 2 93 0 34 4 250 cm 250 bk 22 149 398 0 2 displaystyle 0 to 2 38 0 165 4 0 3 displaystyle 0 to 3 3 5 130 9 0 4 displaystyle 0 to 4 2 4 129 8 0 5 displaystyle 0 to 5 40 3 87 1 0 4 displaystyle 0 to 4 42 3 85 1 0 7 displaystyle 0 to 7 48 0 79 4 0 5 displaystyle 0 to 5 59 5 67 9 0 1 displaystyle 0 to 1 65 8 61 6 0 3 displaystyle 0 to 3 77 5 49 9 0 2 displaystyle 0 to 2 87 0 40 4 0 6 displaystyle 0 to 6 92 5 34 9 0 5 displaystyle 0 to 5 99 3 28 1 0 2 displaystyle 0 to 2 108 4 19 0 0 4 displaystyle 0 to 4 110 6 16 8 0 8 displaystyle 0 to 8 118 0 9 4 0 3 displaystyle 0 to 3 119 4 8 0 249 bk 249 cf 23 153 124 7 2 9 2 displaystyle 7 2 to 9 2 123 6 253 7 7 2 11 2 displaystyle 7 2 to 11 2 61 1 191 2 7 2 13 2 displaystyle 7 2 to 13 2 12 6 117 5 7 2 5 2 displaystyle 7 2 to 5 2 21 4 108 7 7 2 7 2 displaystyle 7 2 to 7 2 64 4 65 7 7 2 15 2 displaystyle 7 2 to 15 2 98 1 32 0 7 2 9 2 displaystyle 7 2 to 9 2 119 5 10 6 double beta decay edit main article double beta decay some nuclei can undergo double beta decay 2β where the charge of the nucleus changes by two units double beta decay is difficult to study as it has an extremely long half life in nuclei for which both β decay and 2β are possible the rarer 2β process is effectively impossible to observe however in nuclei where β decay is forbidden but 2β is allowed the process can be seen and a half life measured 62 thus 2β is usually studied only for beta stable nuclei like single beta decay double beta decay does not change a thus at least one of the nuclides with some given a has to be stable with regard to both single and double beta decay ordinary 2β results in the emission of two electrons and two antineutrinos if neutrinos are majorana particles i e they are their own antiparticles then a decay known as neutrinoless double beta decay will occur most neutrino physicists believe that neutrinoless 2β has never been observed 62 see also edit common beta emitters neutrino betavoltaics particle radiation radionuclide tritium illumination a form of fluorescent lighting powered by beta decay pandemonium effect total absorption spectroscopy notes edit current mass determinations cannot decisively determine whether 222 rn is energetically possible to undergo β decay the decay energy given in ame2020 is 6 8 kev 55 56 but in any case its q β b displaystyle q_ beta _ b value is much higher than its q β c displaystyle q_ beta _ c value and so it is predicted that β will be greatly accelerated for fully ionized 222 rn 86 57 see the next subsection bound state beta decays for 148 eu and 244 pu involve fifth forbidden transitions so they should be negligible 54 note also that the decay of bare 187 re is dominated by the nonunique transition to the first excited state of 187 os since the decay to the ground state has a much smaller matrix element 60 a level of 227 th whose existence of uncertain due to inconsistent measurements of energy 86 81 kev from alpha decay of 231 u and 81 94 kev from electron capture of 227 pa is omitted in the table the 149 99 kev level is also omitted since q β b displaystyle q_ beta _ b would be too close to zero to have its sign determined as the error margin would be too large references edit 1 2 3 4 5 konya j nagy n m 2012 nuclear and radio chemistry elsevier pp 74 75 isbn 978 0 12 391487 3 bijker r santopinto e 2015 valence and sea quarks in the nucleon journal of physics conference series 578 1 012015 arxiv 1412 5559 bibcode 2015jphcs 578a2015b doi 10 1088 1742 6596 578 1 012015 s2cid 118499855 cottingham w n greenwood d a 1986 an introduction to nuclear physics cambridge university press p 40 isbn 978 0 521 31960 7 basdevant j l rich j spiro m 2005 fundamentals in nuclear physics from nuclear structure to cosmology springer isbn 978 0 387 01672 6 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pdf chinese physics c 45 3 030001 doi 10 1088 1674 1137 abddae 1 2 bosch f et al 1996 observation of bound state beta minus decay of fully ionized 187 re 187 re 187 os cosmochronometry physical review letters 77 26 5190 5193 bibcode 1996phrvl 77 5190b doi 10 1103 physrevlett 77 5190 pmid 10062738 takahashi k boyd r n mathews g j yokoi k 1 october 1987 bound state beta decay of highly ionized atoms physical review c 36 4 1522 1528 bibcode 1987phrvc 36 1522t doi 10 1103 physrevc 36 1522 pmid 9954244 1 2 bilenky s m 2010 neutrinoless double beta decay physics of particles and nuclei 41 5 690 715 arxiv 1001 1946 bibcode 2010ppn 41 690b doi 10 1134 s1063779610050035 hdl 10486 663891 s2cid 55217197 further reading edit jensen carsten 2012 controversy and consensus nuclear beta decay 1911 1934 illustrated ed springer isbn 9783034884440 tomonaga s i 1997 the story of spin university of chicago press external links edit the live chart of nuclides iaea with filter on decay type beta decay simulation archived 2018 12 22 at ...
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