TY - JOUR
T1 - Collectivity in A ~ 70 nuclei studied via lifetime measurements in Br and Se
AU - Nichols, A.J.
AU - Wadsworth, R.
AU - Iwasaki, H.
AU - Kaneko, K.
AU - Lemasson, A.
AU - de Angelis, G.
AU - Bader, V.M.
AU - Baugher, T.
AU - Bazin, D.
AU - Bentley, M.A.
AU - Berryman, J.S.
AU - Braunroth, T.
AU - Davies, P.J.
AU - Dewald, A.
AU - Fransen, C.
AU - Gade, A.
AU - Hackstein, M.
AU - Henderson, J.
AU - Jenkins, D.G.
AU - Miller, D.
AU - Morse, C.
AU - Paterson, I.
AU - Simpson, E.C.
AU - Stroberg, S.R.
AU - Weisshaar, D.
AU - Whitmore, K.
AU - Wimmer, K.
PY - 2014/6/2
Y1 - 2014/6/2
N2 - Transition strengths for decays from low-lying states in A ~ 70 nuclei have been deduced from lifetime measurements using the recoil distance Doppler shift technique. The results confirm the collectivity previously reported for the 21+→0gs+ decay in Se and reveal a relative decrease in collectivity in Br. This trend is reproduced by shell model calculations using the GXPF1A interaction in an fp model space including the Coulomb, spin-orbit and isospin non-conserving interactions. The 31+→21+ decay in Br is found to have a very small B(M1) value, which is consistent with the configuration of the state being dominated by the coupling of f52 protons and neutrons. The results suggest that the g92 orbit does not play an important role at low spin in these nuclei. The B(E2) values for the decays of the (T = 1) 21+ states in Br and Se are almost identical, suggesting there is no major shape change between the two nuclei at low spin.
AB - Transition strengths for decays from low-lying states in A ~ 70 nuclei have been deduced from lifetime measurements using the recoil distance Doppler shift technique. The results confirm the collectivity previously reported for the 21+→0gs+ decay in Se and reveal a relative decrease in collectivity in Br. This trend is reproduced by shell model calculations using the GXPF1A interaction in an fp model space including the Coulomb, spin-orbit and isospin non-conserving interactions. The 31+→21+ decay in Br is found to have a very small B(M1) value, which is consistent with the configuration of the state being dominated by the coupling of f52 protons and neutrons. The results suggest that the g92 orbit does not play an important role at low spin in these nuclei. The B(E2) values for the decays of the (T = 1) 21+ states in Br and Se are almost identical, suggesting there is no major shape change between the two nuclei at low spin.
UR - http://www.scopus.com/inward/record.url?scp=84899130703&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2014.04.016
DO - 10.1016/j.physletb.2014.04.016
M3 - Article
AN - SCOPUS:84899130703
SN - 0370-2693
VL - 733
SP - 52
EP - 57
JO - Physics Letters B : Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters B : Nuclear, Elementary Particle and High-Energy Physics
ER -