Level structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Se</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>70</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Ramayya, A. V.; Sastry, D.L.; Hamilton, J. H.; Piercey, R. B.; Kawakami, H.; Lima, A.P. de; Maguire, C.; Robinson, R.L.; Kim, H. J.; Wells, J.C.; Rester, A.C.

doi:10.1103/physrevc.24.1486

Cited by 20 publications

(12 citation statements)

References 14 publications

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“…In general, we find a good agreement with previous γ-spectroscopy works [28,[52][53][54][55][56][57], with the exception of the location of the 1609-keV transition which was previously suggested to feed the 2 + 1 state from a (4 + ) candidate at 2553 keV [28]. Looking at our β-delayed γ-gated coincidence data in Fig.…”

Section: B β-Delayed γ Spectroscopysupporting

confidence: 79%

“…2. A total of 28 γ rays are attributed to the β decay of the T = 0 (J π = 9 + ) isomer, of which the 661-, 1103-, 1561-, and 1749-keV transitions are reported here for the first time and the rest were reported in previous works [28,[52][53][54][55][56][57]. The β(γγ) coincidence spectra gated on the new transitions and on the 958-and 1609-keV γ rays are shown in Fig.…”

Section: B β-Delayed γ Spectroscopymentioning

confidence: 98%

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Simultaneous investigation of the T=1(Jπ=0+) and T=0(J

Morales¹,

Algora²,

Rubio³

et al. 2017

Phys. Rev. C

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Simultaneous investigation of the T = 1 (J π = 0 + ) and T = 0 (J π = 9 + ) β decays in The β decay of the odd-odd nucleus 70 Br has been investigated with the BigRIPS and EURICA setups at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center. The T = 0 (J π = 9 + ) and T = 1 (J π = 0 + ) isomers have both been produced in in-flight fragmentation of 78 Kr with ratios of 41.6(8)% and 58.4(8)%, respectively. A half-life of t 1/2 = 2157 +53 −49 ms has been measured for the J π = 9 + isomer from γ-ray time decay analysis. Based on this result, we provide a new value of the half-life for the J π = 0 + ground state of 70 Br, t 1/2 = 78.42 ± 0.51 ms, which is slightly more precise, and in excellent agreement, with the best measurement reported hitherto in the literature. For this decay, we provide the first estimate of the total branching fraction decaying through the 2 + 1 state in the daughter nucleus 70 Se, R(2 + 1 ) = 1.3 ± 1.1%. We also report four new low-intensity γ-ray transitions at 661, 1103, 1561, and 1749 keV following the β decay of the J π = 9 + isomer. Based on their coincidence relationships, we tentatively propose two new excited states at 3945 and 4752 keV in 70 Se with most probable spins and parities of J π = (6 + ) and (8 + ), respectively. The observed structure is interpreted with the help of shell-model calculations, which predict a complex interplay between oblate and prolate configurations at low excitation energies.

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Section: B β-Delayed γ Spectroscopysupporting

confidence: 79%

Section: B β-Delayed γ Spectroscopymentioning

confidence: 98%

Simultaneous investigation of the T=1(Jπ=0+) and T=0(J

Morales¹,

Algora²,

Rubio³

et al. 2017

Phys. Rev. C

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“…The band structure of 7~ has been previously interpreted by Ahmed et al [14] E2) values. An intriguing, although not unique interpretation of the data is to assume a transition from an oblate ground state to a prolate sband.…”

Section: Discussionmentioning

confidence: 87%

“…Nolte et al [12] and Wadsworth et al [13] have identified some low-lying states while level energies, spin-parity assignements and ))-ray branching ratios of high spin states up to 8 + resp. 7 have been measured by Ahmed et al [14]. The decay of the supposed excited 0 + state at 2,011 keV excitation has been studied by the Cologne group.…”

Section: Introductionmentioning

confidence: 98%

Lifetime measurements in70Se and72Se

Heese

Lieb

Lühmann

et al. 1986

Z. Physik A - Atomic Nuclei

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Mean lives and limits of lifetimes have been determined for some ten mostly yrast states in 7~ by means of the recoil distance Doppler shift technique. The states were excited in the reaction 4~ c~2p) at 115 MeV resp. the reaction 58Ni(14N, pn) at 39 MeV beam energy. The systematic decrease of B(E2) values along the the ground band transitions indicates a band crossing consistent with the ))-ray energies. Effects of continuum feeding times in both reactions are being discussed. The lifetimes of the lowest three yrast transitions in 72Se have been remeasured by means of the reactions 4OCa (36Ar ' 4p) and 6~ (14N, pn).

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“…A low moment of inertia could also, however, be consistent with a weakly deformed prolate shape and is an observable which can be perturbed by other factors such as mixing. No evidence for a lowlying 0 state is reported, which would be strong evidence for shape coexistence, nor is such a state known in the rather well-studied nucleus, 70 Se, where the lowest suggested state with a spin/parity of 0 is at 2012 keV [14]. It is interesting to note that the moment of inertia of the ground-state band in 70 Se mimics very closely that of the suggested oblate band in 68 Se at low spin, and the prolate band above I 6 (see Fig.…”

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confidence: 96%

Measurement of the Sign of the Spectroscopic Quadrupole Moment for the21+State inSe70: No Evidence for Oblate Shape

Hurst¹,

Butler²,

Jenkins³

et al. 2007

Phys. Rev. Lett.

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Using a method whereby molecular and atomic ions are independently selected, an isobarically pure beam of 70 Se ions was postaccelerated to an energy of 206 MeV using REX-ISOLDE. Coulomb-excitation yields for states in the beam and target nuclei were deduced by recording deexcitation rays in the highly segmented MINIBALL -ray spectrometer in coincidence with scattered particles in a silicon detector. At these energies, the Coulomb-excitation yield for the first 2 state is expected to be strongly sensitive to the sign of the spectroscopic quadrupole moment through the nuclear reorientation effect. Experimental evidence is presented here for a prolate shape for the first 2 state in 70 Se, reopening the question over whether there are, as reported earlier, deformed oblate shapes near to the ground state in the light selenium isotopes. DOI: 10.1103/PhysRevLett.98.072501 PACS numbers: 21.10.Ky, 25.70.De, 27.50.+e A remarkable property of the nucleus is its ability to assume different configurations giving energy minima corresponding to different shapes of the mean field. It is often claimed that the presence of low-lying excited 0 states in even-even nuclei is strong evidence for such shape coexistence, since it is difficult to account for the presence of such states otherwise [1,2]. Arguably the most striking example of this is the case of 186 Pb [3], where both the first and second excited states have a spin parity of 0 . These states were interpreted as the bandheads of oblate and prolate rotational configurations, in close competition with the spherical ground state expected for this singly magic (Z 82) nuclear system. The region close to the N Z line from 56 Ni to 80 Zr is believed to be one of rapidly changing nuclear shape. At the upper end of this region, strongly prolate deformed shapes are found: 80 Zr is suggested to have 2 0:4 on the basis of the high moment of inertia [4], and a strongly prolate ground state, consistent with 2 0:4, has recently been established from the Gamow-Teller strength distribution in 76 Sr [5]. For the midshell nuclei near N Z 34 and 36, large shell gaps exist for protons and neutrons at both prolate and oblate shape, which would favor shape coexistence near the ground state. In the light krypton isotopes, 72-78 Kr, a low-lying excited 0 state is observed. There is good experimental evidence that this state has an oblate intruder configuration, and it most likely becomes the ground state in 72 Kr [6,7]. An analysis of the mixing of this state with the ground state, through consideration of their perturbed energies and the excited state lifetime, suggests an oblate ground state for 72 Kr [6], while the recently measured BE2; 0 ! 2 value in this nucleus, PRL 98,

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Level structure ofSe70

Cited by 20 publications

References 14 publications

Simultaneous investigation of the T=1(Jπ=0+) and T=0(J

Simultaneous investigation of the T=1(Jπ=0+) and T=0(J

Lifetime measurements in70Se and72Se

Measurement of the Sign of the Spectroscopic Quadrupole Moment for the21+State inSe70: No Evidence for Oblate Shape

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