A study of the principal decay modes and lifetimes of levels in<sup>29</sup>Si below 7.2 MeV

Bailey, David C.; Carr, P E; Durell, John; Green, L L; Greene, M.W.; James, A.N.; Sharpey‐Schafer, J. F.; Viggars, D.A.

doi:10.1088/0305-4470/5/4/016

Cited by 8 publications

(2 citation statements)

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“…This is indicative of a change in the structure therein. Indeed, the 3624 keV (7/2 − ) level has been interpreted as the band-head of the K π = 7/2 − band in the previous studies [10,28]. Such a scenario warrants a re-examination of the 1596 keV transition with the contemporary spectroscopy tools, as used in the present investigation.…”

Section: Resultsmentioning

confidence: 51%

“…1. The lifetime of the 1274 keV (J π = 3/2 + ) level has been reported in several previous studies [10][11][12][13][14][15][16][17][18] but the values are considerably variant, with a few of them having substantial uncertainties. Similarly, the multipolarity and the electromagnetic assignment of the 1596 keV transition, de-exciting the lowest negative parity state (3624 keV, J π = 7/2 − ), has been investigated in a previous study [19] carried out with a NaI(Tl) scintillator detector, with the concomitant large uncertainties on the angular distribution coefficients (Fig.…”

Section: Introductionmentioning

confidence: 98%

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Spectroscopy and shell model calculations in Si isotopes

Bhattacharjee

Raut

et al. 2015

Phys. Rev. C

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The 29 Si nucleus has been studied using heavy-ion induced fusion-evaporation reaction and, for the first time, using a large array of high resolution γ-ray detectors. High spin states of the nucleus have been populated using 18 O( 16 O,αn) and 18 O( 13 C,2n) reactions at E lab = 30-34 MeV. Previously reported levels have been confirmed and a new level has been identified in the present study. Spin-parity assignments have been carried out based on the anisotropy and polarization measurements of the observed γ-transitions. Level lifetimes have been measured using Doppler Shift Attenuation Method (DSAM), with modified analysis techniques for the thick molecular target (Ta2O5) used in the present setup. Lifetime of the lowest negative parity state at Ex = 3624 keV has been substantially modified from the previously reported value. Large basis shell model calculations have been carried out for the nucleus using updated interactions and the results corroborate the experimental findings. The calculations have also been carried out for the neighbouring 28,30 Si isotopes. In case of the 28 Si nucleus, the calculations adequately reproduce most of the deformed structures, as represented by the quadrupole moments extracted therefrom. In the 30 Si nucleus, the negative parity states have been reproduced for the first time without any ad hoc lowering of the single particle energies. It can be generally stated that the shell model calculations adequately describe the experimental observations in these nuclei.

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Section: Resultsmentioning

confidence: 51%

Section: Introductionmentioning

confidence: 98%

Spectroscopy and shell model calculations in Si isotopes

Bhattacharjee

Raut

et al. 2015

Phys. Rev. C

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The measurement of the lifetimes of excited nuclear states

1979

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The experimental techniques of measuring the mean lifetimes T of excited nuclear states is reviewed. Emphasis is put on direct measurements of T in the region 10-18-10-6 s, especially on techniques involving the observation of Doppler energy shifts of y-rays. Indirect methods of obtaining T by measuring the widths or partial widths are discussed. Comparisons are made of the applicability, accuracy and reliability of the different experimental techniques.

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