T-z =-1 -> 0 beta decays of Ni-54, Fe-50, Cr-46, and Ti-42 and comparison with mirror (He-3,t) measurements
Tarih
2015Yazar
GORSKA, M.
KOJOUHAROV, I.
Matsubara, H.
MORALES, A. I.
PAUWELS, D.
PEREZ-LOUREIRO, D.
Pietri, S.
Podolyak, Zs.
PROKOPOWICZ, W.
Rudolph, D.
SCHAFFNER, H.
STEER, S. J.
TAIN, J. L.
Tamii, A.
Oktem, Yeşim
Ganioglu, E.
Cakirli, R. B.
Susam, Lidya
TASHENOV, S.
VALIENTE-DOBON, J. J.
VERMA, S.
WOLLERSHEIM, H-J.
Molina, F.
Rubio, B.
Fujita, Y.
Gelletly, W.
AGRAMUNT, J.
Algora, A.
BENLLIURE, J.
BOUTACHKOV, P.
CACERES, L.
CASAREJOS, E.
DOMINGO-PARDO, C.
DOORNENBAL, P.
GADEA, A.
GASCON, M.
GEISSEL, H.
GERL, J.
GREBOSZ, J.
HOISCHEN, R.
KUMAR, R.
KURZ, N.
Üst veri
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We have studied the beta decay of the T-z = -1, f(7/2) shell nuclei Ni-54, Fe-50, Cr-46, and Ti-42 produced in fragmentation reactions. The proton separation energies in the daughter T-z = 0 nuclei are relatively large (approximate to 4-5 MeV) so studies of the. rays are essential. The experiments were performed at GSI as part of the Stopped-beam campaign with the RISING setup consisting of 15 Euroball Cluster Ge detectors. From the newly obtained high precision beta-decay half-lives, excitation energies, and beta branching ratios, we were able to extract Fermi and Gamow-Teller transition strengths in these beta decays. With these improved results it was possible to compare in detail the Gamow-Teller (GT) transition strengths observed in beta decay including a sensitivity limit with the strengths of the T-z = +1 to T-z = 0 transitions derived from high resolution (He-3,t) reactions on the mirror target nuclei at RCNP, Osaka. The accumulated B(GT) strength obtained from both experiments looks very similar although the charge exchange reaction provides information on a broader energy range. Using the "merged analysis" one can obtain a full picture of the B(GT) over the full Q(beta) range. Looking at the individual transitions some differences are observed, especially for the weak transitions. Their possible origins are discussed.
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