TY - JOUR
T1 - Structure of positive parity states in 29P and two-step processes in (p,t) reactions
AU - Seth, K. K.
AU - Saha, A.
AU - Nann, H.
AU - Wildenthal, B. H.
N1 - Funding Information:
The positive parity states in the mirror nuclei 29Si-29p have been alternately explained in terms of the strong-coupling Nilsson model \[1 , 2\] or of the intermediate core-coupling model \[3, 4\]. In the Nilsson model the ground-state band is a K ~ = 1/2 + \[211\] band whose other members are the 3/2~ and 5/2"~ states, and the K 7r = 3/2 + \[202\] band consists of 3/2~', 5/2~ and perhaps 7/2~-states. In the intermediate coupling calculations 2sl/2, Ida/2, and lds/2 single-particle states are coupled to the 28Si quadrupole phonon states. While qualitatively both these calculations are equally satisfactory neither provide quantitative agreement with particle transfer as well as decay data. In this letter we present experimental data which bears on an alternate empirical explanation for the structure of some of the positive parity states in 29 p. It has recently been shown that (p, t) reactions on odd-A nuclei provide a powerful means of identifying weak-coupling core-excited states \[5, 6\]. The identification is done by noting that such states can be reached by the same L-transfer, and with nearly the same cross sections and angular distributions as the core states in (p, t) reactions on adjoining even-A nuclei. We report here on our study of the reactions 31p(p, t)29p and 30Si(p, t)28Si and show that the data * Supported in part by the U.S. Energy Research and Devel-opment Administration. ** Supported in part by the U.S. National Science Founda-tion.
PY - 1975/11/24
Y1 - 1975/11/24
N2 - From a study of (p,t) reactions on 31P and 30Si it is suggested that in 29P the states with Jπ= 1 21+ and 1 22+, the pair 3 22+, 5 21+, and the pair 7 23+, 9 21+ are related by weak coupling of a s 1 2 proton with the states 01+, 02+, 21+ and 41+ respectively of 28Si. Completely atypical L = 2 angular distributions have been obtained for the 3 21+ and 5 22+ states in 29P and it is suggested that this is due to contribution by two-step processes.
AB - From a study of (p,t) reactions on 31P and 30Si it is suggested that in 29P the states with Jπ= 1 21+ and 1 22+, the pair 3 22+, 5 21+, and the pair 7 23+, 9 21+ are related by weak coupling of a s 1 2 proton with the states 01+, 02+, 21+ and 41+ respectively of 28Si. Completely atypical L = 2 angular distributions have been obtained for the 3 21+ and 5 22+ states in 29P and it is suggested that this is due to contribution by two-step processes.
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U2 - 10.1016/0370-2693(75)90085-4
DO - 10.1016/0370-2693(75)90085-4
M3 - Article
AN - SCOPUS:21244453779
VL - 59
SP - 333
EP - 335
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 4
ER -