Systematic trends in the beta minus strength functions of neutron-rich rubidium isotopes

Kratz, K. L.; Ohm, H.; Sümmerer, K.; Zendel, M.; Jung, G.; Wünsch, K. D.; Ristori, C.; Crançon, J.; Prussin, S.G.

doi:10.1016/0370-2693(79)90611-7

Cited by 16 publications

(10 citation statements)

References 16 publications

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“…2). The same effect was observed earlier for core-polarized states in [15,[24][25][26], the dashed lines connect values calculated by the gross theory [8], the full squares correspond to microscopic calculations the y-decay of isobaric analog states in Sc, V, Cu [22,23]. The effect is reproduced by the calculation (Fig.…”

Section: -7t P31z(~ Pll; V P 112)1 +supporting

confidence: 78%

“…According to [15] two maxima are observed experimentally in S~ for 93-97Rb. The lower one is lying at an excitation energy of 4.1-4.2MeV and corresponds well to the one predicted theoretically.…”

Section: -7t P31z(~ Pll; V P 112)1 +mentioning

confidence: 78%

“…[11][12][13]). This has been pointed out in [1][2][3][4][5] and is experimentally evident from high resolution/3-delayed neutron spectroscopy [14,15] and from the isovector M1 y-decay of isobaric analogue states [1,2,16,19]. The presence of low-lying sharp structures in S~ will imply large changes in predicted /3-half-lifes, and in the presently made analysis of all of these/3-delayed phenomena and astrophysical calculations [1 5].…”

Section: Introductionmentioning

confidence: 77%

“…The first calculations of/3-delayed fission probabilities based on microscopic calculations of S~_ and S~+ (the latter using the method given in [21] are given in [3,4]. Recently experimental data on S~_ for 93-97Rb became available from high-resolution /3-delayed neutron work [15]. These results are of particular interest because they give experimental information on S~ for isotopes reaching rather near to the r-process path (see, e.g.…”

Section: Introductionmentioning

confidence: 98%

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Structure in the beta strength function of very neutron-rich Rb-isotopes

1979

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The beta strength function Sp_ is calculated in a schematical Brown-Bolsterli model for the Gamow-Teller 13-decay of 89 99Rb ' The position of the peaks in Sp resulting from the back spin flip transitions and the calculated life-times are in good agreement with recent experimental results. A simple regularity is found to govern the energy position of the lowest-lying structures in S~. By calculations of the type given here thus it should be possible to produce much more reliable input data concerning S~ for r-or n-process calculations than have been used up to now in astrophysical calculations.

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Section: -7t P31z(~ Pll; V P 112)1 +supporting

confidence: 78%

Section: -7t P31z(~ Pll; V P 112)1 +mentioning

confidence: 78%

Section: Introductionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 98%

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Structure in the beta strength function of very neutron-rich Rb-isotopes

1979

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“…First, since the experimental spectrum was dominated by simple nuclear structure through which the 13-decay intensity was largely funneled, the statistical arguments failed. Analogous behavior has previously been observed for the decay of lighter nuclei in the 8-delayed neutron studies of Kratz et al ( 5 ,6 ). It was also observed in low-resolution continuum y-ray studies by Duke et al ( 7 ), who noted a substantial decrease in the magnitude of the 13-strength near N=l26.…”

Section: Introductionsupporting

confidence: 60%

Complex beta-decay schemes: Pandemonium lost and paradise regained

Firestone

1982

Physics Letters B

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The beta decay of 145 Gd has been studied in sufficient detail for comparison with the decay of its fictional analogue. Pandemonium. It is shown ~ that >98% of the 145 Gd decay intensity was observed. This result casts doubt on the value of decay schemes determined solely by statistical techniques.The decay of the fictional nucleus Pandemonium has been described by Hardy, Carraz, Jonson, and Hansen(l) (hereafter HCJH). This nucleus was proposed to decay in such a complicated manner, with numerous B-decay branches and.y-ray transitions, that it could not be experimentally studied. Despite the fact that the simulated Pandemonium decay scheme was constructed using a statistical model, without any experimental confirmation, the authors concluded that we 11 need to reevaluate the usefulness of a whole class of experiments". In view of the gravity of that conclusion, the actual decay of Pandemonium has recently been experimentally investigated( 2 ), in detail, to test the arguments put forth by HCJH. It will be shown here that those arguments were too simplistic to describe real decay schemes and that the death knell for such studies is unwarranted. B-transition probabilities generated in a random Porter-Thomas distribution assuming a constant B-decay strength function( 4 ). This last point was significant in that a constant B-decay strength would effectively remove all nuclear structure from the analysis.-2-The resulting decay scheme was used to generate a theoretical y-r~y singles spectrum for Pandemonium. This spectrum appeared very realistic and was conventionally analyzed to discover how much experimental information could be extracted from various amounts of data. HCJH concluded that 9 with 11 more complete data than most experiments can produce 11 only 81 of 'VlQOO y rays would be observed representing 94% of the total Y-ray intensity. They further proposed that this problem would be compounded if additional complexity in the Y-ray deexcitation pattern were included. For the earlier 145 Gd decay scheme, HCJH concluded that "'20% of the decay intensity went undetected.The recent study of 145 Gd decay ( 2 ) has resulted in the placement of 326 Y rays deexciting 136 levels in 145 Eu. This decay scheme was constructed primarily from the analysis of a Y-ray singles spectrum with 2xl0 9 events and from coincidence data consisting of 1.3xl0 7 y-y coincidence pairs. These experimental y-ray singles statistics roughly corresponded to HCJH's best case (10 6 events in the srongest peaks). The actual decay-scheme drawing is too large to be included in this letter and will only be referred to in the following discussion. Four times the number of predicted y rays were observed and that result was consistent with a very complex y-ray deexcitation pattern. Indeed, the number of y rays observed is a meaningless figure-because ali. transitions between every level will occur with some finite:intens'ity. It is more important that they rays observed represent a substantial portion of the total y-ray intensity. HCJH estimate...

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Beta Decay and Strength Distributions

Hardy

1980

Theory and Applications of Moment Methods in Many-Fermion Systems

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Systematic trends in the beta minus strength functions of neutron-rich rubidium isotopes

Cited by 16 publications

References 16 publications

Structure in the beta strength function of very neutron-rich Rb-isotopes

Structure in the beta strength function of very neutron-rich Rb-isotopes

Complex beta-decay schemes: Pandemonium lost and paradise regained

Beta Decay and Strength Distributions

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