663The gross theory of nuclear j3-decay proposed by Takahashi and Yamada is reinvestigated. A revised model for treating the even-odd mass difference is set up and is applied to the calculation of the squared Fermi matrix elements. The results for the superallowed transitions agree well with those expected from the isospin formalism except for the transitions from odd-odd to even-even nuclei. The isospin-forbidden Fermi transitions are also studied. The results are consistent with the existence of the gross structure in the Fermi transitions.If the isospin is conserved and as far as the conserved vector current (CVC) theory 5 l is valid, 6 l the Fermi transition should obey the selection rule iJT= 0 (T: total isospin). The strength of the conventional Fermi matrix element is exhausted by the analog state to which the /1-decay cannot occur energetically in heavier nuclei. In this paper, we assume the CVC. Then, in the usual /1transitions feeding the states other than the analog state, only the isospin impurities in the wave functions contribute to the Fermi parts of the transitions. Conversely, the isospin impurity can be evaluated from the small Fermi matrix elements. Such an idea was first applied to the o-1 --0 l-Fermi transition by Alford and French in the case of 66 Ga decay . 7 l A fuller discussion of the role of the isospin in the {1-decay is given in the review article by Bloom. 8 l·*l On the experimental side, it has become possible to separate the Fermi matrix element in the allowed transition of mixed type by measurements of the /1-r (CP=--= circularly polarized) correlation. A rather large amount of data have been accumulated till now.Theoretical calculations of the isospin-forbidden Fermi matrix elements were *' Quite recently, Blin-Stoyle's review article 47 > appeared. at Purdue University Libraries ADMN on May 31, 2015 http://ptp.oxfordjournals.org/ Downloaded from (2) where --E is the decay energy. The integrand I Afli' (E) 1 2 is the average of the squared Fermi matrix elements around E multiplied by the final level density.* 1 *l Such a quantity as this is sometimes called the "strength function ".1 4 ) at Purdue University Libraries ADMN on May 31, 2015 http://ptp.oxfordjournals.org/ Downloaded frombecause the relevant single-particle operator r;~;or r;~;+ necessarily transforms a proton to a neutron or vice versa leaving the amplitude unchanged as a whole.Other properties of DF (E, c.) are also inferred from sum rules. In Eq.(3), c; 1 and 8 0 (E) are respectively the upper and lower limits of the "single-nucleon en-
A 64-year-old woman presented with exertional dyspnea. The case was diagnosed as mixed connective tissue disease (MCTD) due to presence of swollen fingers, Raynaud's phenomenon, muscle weakness, positive anti-U1RNP antibody, pericarditis and interstitial pneumonia. Although the histology from a transbronchial lung biopsy (TBLB) indicated organizing pneumonia, corticosteroid therapy was postponed for two months at the patient's request. She died 8 weeks later from acute progressive interstitial pneumonia in spite of the administration of intravenous cyclophosphamide combined with prednisolone. The autopsy revealed exudative and organizing diffuse alveolar damage (DAD). Previous reports have shown that DAD is an extremely rare pulmonary complication in MCTD. This report presents a case of MCTD with acute respiratory failure. This case thus suggests that this therapy should be administered as soon as possible.
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