Simultaneous measurement ofβ-delayed proton andγdecay ofP27

Abstract

This is the first study of 27 P that measured both the β-delayed proton and β-delayed γ decays. While no new proton groups in the astrophysically interesting energy region of 300 -400 keV were observed, a new upper limit on the proton branching of 0.16% was estimated. Several new γ-ray lines were observed, mainly coming from the isobaric analog state (IAS) in 27 Si, which has been assigned a more accurate energy value of 6638(1) keV.

An above-barrier narrow resonance in 15 F

“…The measured width is lower than the values obtained in previous studies by at least 30%, but is still within the error bars. This lower value is also supported by some theoretical considerations [39,40]. In Fig.…”

Large mirror asymmetry in Gamow-Teller β-decay in the A = 26 isobaric multiplet

“…Together with our early work [11], we have concluded [18] that the T = 1, J = 0 INC force is important for the CDE and TDE in the sd-shell as well as in the f p-shell. However, including the T = 1, J = 0 INC force could not describe the three experiments [42][43][44] in the superallowed Fermi β decays for 31 Cl, 32 Cl, and 23 Al [45]. It was found [18] that an additional T = 1, J = 2 INC force related to the s 1/2 orbit is essential for the explanation of the superallowed Fermi β decay data.…”

“…(2) Figure 1 shows the observed mirror asymmetry δ as a function of mass number A [20][21][22][23][24][25][26][27][28][29][30][31][32]. For most of the masses in the p and sd shells, the observed mirror asymmetry in GT β-decays are not large [22].…”

“…1). It should be noted that the current uncertainty for A = 27 is very large due to the uncertainty of the logf t data for 27 P β-decay [31].…”

“…Calculations are (Color online) Calculated and experimental mirror asymmetries for A = 26−29 pairs of β ± decays. Experimental data are taken from Refs [21,23,31,32]…”