Short lifetimes in 29Si-29P for the test of shell-model wave functions

Extending the application of DSAM to atypical stopping media

“…of the 5255-keV level, de-exciting by the 1631-keV transition, is 106 ± 2 fs, in close compliance with the previously reported values of 80 ± 4 fs by Tikkannen et al[30], that does not include uncertainties on the stopping power, and 100 ± 20 fs by Bardin et al[31], that includes a 15% stopping power uncertainty. However, the lifetime of the 3624-keV level, de-excited by the 1596-keV transition, comes out to be 2.48 ± 0.08 ps, which is at variance with the literature values of 3.76 ± 0.19 ps reported by Tikkannen et al[30], that probably does not include the uncertainties in the stopping powers of Ziegler[10], or 3.74 ± 0.19 ps by Scherpenzeel et al[29], using the stopping powers of Forster et al[38]. It may be noted that this discrepancy in the lifetime of the 3624-keV state, with respect to the previously measured values, has also been reported by our group[39], using an independent set of developments, reported elsewhere[17].…”

“…Uncertainties on individual measurements ∼ 5%. 7 Measurement by Tikkannen et al [30] using stopping powers from Ziegler et al [10] and quoting the uncertainty from the same to be 7%. The uncertainty on the lifetime probably does not include this.…”

“…[13,17]. The particular nuclei studied include 26 Mg, 29,30 Si (Z = 14), 33,34 the experimental determination of the stopping powers is expected to favorably restrict the uncertainties on the same, such a measurement as by Forster et al with particular projectile-target combinations might only be of limited use. Fig.…”

Spectroscopy and shell model calculations in Si isotopes

“…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.…”