Transition quadrupole moments in the superdeformed band of40Ca

Abstract

The transition quadrupole moments Q t for the superdeformed band in 40 Ca have been determined through thin-target Doppler-shift attenuation analyses. A best-fit value of Q t ϭ1.30Ϯ0.05 e b is obtained when a single value is assumed for the entire band. Fitting separate quadrupole moments for in-band transitions decaying from the high-spin states and the presumably admixed low-spin states results in Q t (high)ϭ1.81 Ϫ0.26 ϩ0.41 e b and Q t (low)ϭ1.18 Ϫ0.05 ϩ0.06 e b, respectively. Q t values extracted for individual transitions in a Doppler-broadened line-shape analysis also indicate smaller Q t values at lower spins. These results are consistent with the interpretation of this band as an eight-particle-eight-hole superdeformed band with a significant admixture of less-collective configurations at low spins.

From superdeformation to extreme deformation and clusterization in theN≈Znuclei of theA≈40mass region

“…When populated such structures could be observed with the next generation of the γ-tracking detectors such as GRETA and AGATA. In addition, the resonance observed at I ∼ 36 in the 24 Mg+ 24 Mg reaction strongly supports the HD shape for a compound 48 Cr nucleus formed in this reaction [30]. Moreover, the analysis of light particle energy spectra and angular correlations in the framework of the statistical model indicates the onset of large deformations at high spin in 44 Ti [31].…”

“…Two-dimensional alpha cluster model predicts very exotic and highly-deformed configurations in this nucleus [23]. Second, in this mass region the superdeformation has already been observed in the 40 Ca ( [22,24]), 36 Ar ( [25,26]), 35 Cl ( [27]), 40 Ar ( [28]) and probably 28 Si [29] nuclei. Moreover, the SD bands have been seen up to very high spin of I = 16 in some of these nuclei.…”

“…This exotic structure ("Hoyle" state) plays a crucial role in the synthesis of 12 C from three 4 He nuclei in stars [18]. The stability of rod-shaped structures in highly-excited states of 24 Mg was studied in Ref. [9] in cranked Skyrme HF calculations.…”

Beyond-mean-field-model analysis of low-spin normal-deformed and superdeformed collective states ofS32,ArBender1, Flocard2, Heenen3 2003Phys. Rev. C93121412View full textAdd to dashboardCite

“…[3] suggests that Q (t) c2 drops from values around 180 e fm 2 at high spin to values around 120 e fm 2 for the 6 + → 4 + transition. Our calculation is in agreement with this finding, although it predicts the change a few units of angular momentum too low.…”

O16+O16molecular structures of positive- and negative-parity superdeformed bands inTaniguchi1 2014Phys. Rev. C

“…Superdeformation and clustering are typical changes. With the development of techniques for γ spectroscopy experiments, superdeformed (SD) bands have been observed in the A ∼ 40 region, for example, in 36,38,40 Ar [1][2][3], 35 Cl [4], 40,42 Ca [5][6][7][8], and 44 Ti [9], and microscopic theoretical studies have shown that these bands have multiparticle-multihole (mp-mh) excited structures. Clustering is a typical structure in the light mass region, for example, in 8 Be, 12 C, 16 O, and 20 Ne [10,11].…”