Evidence for an Isomeric 29/2<sup>+</sup> Level in <sup>211</sup>At

Bergström, I.; Fant, B.; Herrlander, C.J.; Wikström, K.; Blomqvist, J.

doi:10.1088/0031-8949/1/5-6/008

Cited by 53 publications

(16 citation statements)

References 3 publications

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“…The relative intensities of the delayed gamma rays are given in Table 3 a. It should now be observed that this scheme suggests the following intensity relation of delayed gamma rays: [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30](1 + ~) =11.536 +11,438 +I1,1 54.+11.252 =/tot" Since none of the high energy gamma rays can have a higher multipolarity than E3, the conversion electron intensities can be neglected. From Table 3a it is found that:…”

Section: B) Transitions Indicating the 27/2-levelmentioning

confidence: 99%

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High spin states in205Pb and a precision test of the nuclear shell model for three nucleons

et al. 1976

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Using the 2~ 3n) reaction with e-particles of about 40 MeV, we have proved by applying nowadays conventional y-ray spectroscopy in-beam technique, that there are two isomeric states in 2~ at the excitation energies 5,161.3 and 3,195.5 keV having the half-lives 71 ___ 3 and 217_+ 5 ns, respectively. These isomeric states have spins and parities 33/2 + and 25/2-and are mainly due to the i{3~2and .-2 -1 113,2 Pl, 2 configurations, respectively. This conclusion is supported by the experimental g-factors of these states being -0.159_+ 0.008 and -0.0676_+0.0011, respectively. It is furthermore shown that the E2 effective neutron charge is the same for E2 transitions from the 33/2 + state in 2~and from the 12 + state in 2~as required by the assumption that the 2~ core is responsible for the total E2 strength of the neutron holes, and that these states are due to the ii-332 and i-2 configura-13:2 tions. The calculated B(E3) values of E3 transitions from isomeric states in 2~ and 2~ agree reasonably well with the experimental values as expected from the assumption that the E3-strength should come from particle coupling to the octupole states of the 2~ core. The energies of the six most well established excited states in 2~ with angular momenta in the region 19/2-33/2 were calculated using empirical single-particle energies, empirical two-particle interactions and angular momentum algebra. The average deviation between experimental and calculated energies is -3 keV and the root mean square deviation 6 keV as compared to the uncertainty _+ 5 keV in the nuclear masses used in the calculation. For the orbits concerned the shell model is thus valid with an extremely high precision. The contribution of effective three-particle interaction in these orbits must consequently be less than about 5 keV.

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Section: B) Transitions Indicating the 27/2-levelmentioning

confidence: 99%

“…Previously we have investigated high spin levels in 2nAt (Ref. 17) and 2~ (Ref. 18), which correspond to three protons and two neutron holes plus a proton, respectively.…”

Section: Comparison Between Experimental and Calculated Energiesmentioning

confidence: 99%

High spin states in205Pb and a precision test of the nuclear shell model for three nucleons

et al. 1976

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“…In the odd-A At isotopes, 29/2 + isomeric states have been observed [11][12][13][14][15]. They are assigned to the π (i 13/2 h 2 9/2 ) configuration.…”

Section: Bandmentioning

confidence: 94%

“…The structure of the isomer is associated with the coupling of an h 9/2 proton to the 12 + isomeric state in the 192 Pb core. In several odd-A At isotopes, isomeric states with a spin and parity of 29/2 + have been identified [11][12][13][14][15] and associated with the coupling of the h 9/2 proton to the π (h 9/2 i 13/2 ) configuration. Moreover, the search for highly excited superdeformed (SD) bands to better understand the nuclear properties under extreme deformation has turned out to be very successful in this region of the nuclear chart [8,[16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Detailed spectroscopy of Bi195

et al. 2017

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An experiment aiming to study shape coexistence in 193 Bi has been performed. Due to its transitional character, it has an exceptionally large number of structures identified close to the yrast line. Many new states have been found, significantly extending the previously known level scheme of 193 Bi, including several new rotational bands. The πi 13/2 band was extended to I π = 45/2 + . The I π = 31/2 + member of the πi 13/2 band was found to de-excite also to a long-lived isomeric state. This isomeric state is located at 2350 keV and has a spin and parity of 29/2 + . The half-life of the isomeric state was measured to be 85(3) μs and it decays via the emission of an 84 keV E2 transition. A level structure feeding this isomeric state was constructed. A low-energy, 49 keV transition has been identified to depopulate the (29/2 − ) isomeric state, which places it at an energy 2405 keV in the level scheme. This is the first time such a decay has been observed in the neutron-deficient Bi isotopes. A superdeformed band almost identical to that present in the neighboring isotope 191 Bi, based on the 1/2[651] Nilsson orbital, has also been identified.

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“…8 two-particle cases: 2~ [1], 2~ 2~ 2~ 21~ 21~ 21~ [2], and 2~ 12 three-particle cases: 2~ [3] , 2~ 2~ 2~ 2~ 2~ 211pb, mBi, 211Po, 211At [4], 2~ [5], and 2~ [6] and 16 four-particle cases: 2~ [7], 2~ 2~ 2~ 2Ogpt, 2~ ' 2~ ' 21~ ' 212pb ' 2tZBi ' 212p0 ' 212At ' 212Rn, 21~ [8], 2~ [9], 2~…”

Section: ~mentioning

confidence: 99%

Evidence for a 3.6 minute isomeric 12? state of the ?h 11 2/?1 vi 13 2/?1 configuration in206Tl and effective two-particle interactions

Bergström¹,

Blomqvist²,

Herrlander³

et al. 1976

Z Physik A

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Using the 2~ pn)-reaction and c~-particles of energies 39-55 MeV, we have found an isomeric 3.6 min 12 state in 2~ at 2,642.9 keV which has the two-hole configuration nh11~2 vi{1/2 9 The 12-state decays mainly by an E5 transition of energy 1,021.4 keV to a 7 + state at 1,621.5 keV whose main configuration is nsl/21 vh3/2..-1 There is, in addition, evidence for a weak 565 keV M4 branch to an 8 + state at 2,078 keV whose main configura-

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Evidence for an Isomeric 29/2⁺ Level in ²¹¹At

Abstract: A 70 ns isomeric state at 2 641 keV has been produced in the 209Bi(α,2n)211 At reaction and interpreted as the 29/2+ state of the h 9/2 2 i 13/2 proton configuration. It decays to the states (h 9/2 2 f 7/2)23/2, (h 9/2 3)21/2, (h 9/2 3)17/2, (h 9/2 3)13/2 and (… Show more

Cited by 53 publications

References 3 publications

High spin states in205Pb and a precision test of the nuclear shell model for three nucleons

High spin states in205Pb and a precision test of the nuclear shell model for three nucleons

Detailed spectroscopy of Bi195

Evidence for a 3.6 minute isomeric 12? state of the ?h 11 2/?1 vi 13 2/?1 configuration in206Tl and effective two-particle interactions

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Evidence for an Isomeric 29/2+ Level in 211At

Abstract: A 70 ns isomeric state at 2 641 keV has been produced in the 209Bi(α,2n)211 At reaction and interpreted as the 29/2+ state of the h 9/2 2 i 13/2 proton configuration. It decays to the states (h 9/2 2 f 7/2)23/2, (h 9/2 3)21/2, (h 9/2 3)17/2, (h 9/2 3)13/2 and (… Show more

Cited by 53 publications

References 3 publications

High spin states in205Pb and a precision test of the nuclear shell model for three nucleons

High spin states in205Pb and a precision test of the nuclear shell model for three nucleons

Detailed spectroscopy of Bi195

Evidence for a 3.6 minute isomeric 12? state of the ?h 11 2/?1 vi 13 2/?1 configuration in206Tl and effective two-particle interactions

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Evidence for an Isomeric 29/2⁺ Level in ²¹¹At