Nuclear Data Sheets for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi mathvariant="normal">A</mml:mi><mml:mo>=</mml:mo><mml:mn>69</mml:mn></mml:math>

Nesaraja, C. D.

doi:10.1016/j.nds.2013.12.001

Cited by 49 publications

(34 citation statements)

References 175 publications

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“…Instead f and p orbitals are assumed to dominate the low-lying spectrum. This is also confirmed by the known spectrum of the mirror nuclei [33]. To get opposite parity single-particle orbitals, necessary to form negative parity three-body states, a d 5/2 orbital can be included instead.…”

Section: B Potentials and Propertiessupporting

confidence: 54%

Capture reactions into Borromean two-proton systems atrpwaiting points

et al. 2016

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We investigate even-even two-proton Borromean systems at prominent intermediate heavy waiting points for the rapid proton capture process. The most likely single-particle levels are used to calculate three-body energy and structure as a function of proton-core resonance energy. We establish a linear dependence between two-and three-body energies with the same slope, but the absolute value slightly dependent on partial wave structure. Using these relations we estimate low-lying excited states in the isotones following the critical waiting points. The capture rate for producing a Borromean bound state is described based on a full three-body calculation for temperatures about 0.1-10 GK. In addition, a simple rate expression, depending only on a single resonance state, is found to comply with the three-body calculation for temperatures between 0.1 and 4 GK. The rate calculations are valid for both direct and sequential capture paths. As a result the relevant path of the radiative capture reactions can be determined. We present results for E1 and E2 photon emission, and discuss occurrence preferences in general as well as relative sizes of these most likely processes. Finally, we present a method for estimating proton capture rates in the region around the critical waiting points.

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Section: B Potentials and Propertiessupporting

confidence: 54%

Capture reactions into Borromean two-proton systems atrpwaiting points

et al. 2016

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“…The shell-model calculations correctly predict the experimentally deduced 1/2 − ground state of 69 Se [31] (see Table II). The calculations also predict a significant population of the 5/2 − 1 state in 69 Se, however the decay from this state is not seen experimentally due to its long mean lifetime (2.9(3) µs [32]) and low γ-ray energy (39 keV, which is below the SeGA energy threshold). The calculations predict a vanishingly small population of the 7/2 − 1 state, with larger populations of the 7/2 − 2 and 7/2 − 3 states.…”

Section: Discussionmentioning

confidence: 85%

Spectroscopy and lifetime measurements inGe66,Se69, and
Nichols
¹
,
Wadsworth
²
,
Bentley
³

et al. 2015
Phys. Rev. C
3
0
0
0
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Lifetimes of low-lying excited states have been measured in 66 Ge, 69 Se and 65 Ga using a γ-ray lineshape method. The results confirm the previously reported 7 − 1 state lifetime in 66 Ge. The lifetime of the yrast 5/2 − state in 65 Ga is measured for the first time. Lifetime measurements of two excited 3/2 − states in 69 Se are also reported. Two previously unobserved γ rays have been identified in 69 Se. γ-γ coincidence measurements have been used to place one of these in the level scheme. 69 Se excited state populations are compared to shell-model calculations using the GXPF1A interaction in the fp model space. Theoretical spectroscopic factors to excited states in 69 Se have identified three candidate levels for the origin of one of the new transitions.

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“…Experimental information on the spin-parity of the ground state of neutron-rich (N>40) odd-N Fe isotopes is not yet sufficiently established. However, some experimentally suggested spin-parities, 5/2 + for 67 26 Fe 41 [15] and 1/2 − for 69 26 Fe 43 [16], are difficult to obtain for spherical shape. In contrast, as is seen in Fig.…”

Section: Numerical Resultsmentioning

confidence: 99%

Shape and shell structure of lighter ( N≲90 ) neutron-rich nuclei based on a phenomenological Woods-Saxon potential

Hamamoto

2019

Phys. Rev. C

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By using a phenomenologically successful Woods-Saxon potential, I study the shape and shell structure of (A) neutron drip line nuclei with 10≤N≤60, (B) neutron-rich nuclei related to the rprocess with 40≤N≤90, and (C) one-particle spectra in the potential provided by the nucleus 70 Fe as a representative of so-called N=40 "island of inversion (IoI)" nuclei. First, the shell structure that is unique in very weakly-bound neutrons is systematically studied, and the approximate neutron number of odd-N nuclei at which spherical (or deformed) halos can be found is pinned down. Second, the difference of the shell structure in r-process nuclei from that in stable nuclei is examined. Third, the similarity and the difference between the shell structure of N=20 IoI nuclei and that of N=40 IoI nuclei are analyzed. As a result of it, it is concluded that in Fe and Cr isotopes the deformation called "N=40 IoI" continuing up to N=50 is unlikely. PACS numbers:

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Nuclear Data Sheets forA=69

Cited by 49 publications

References 175 publications

Capture reactions into Borromean two-proton systems atrpwaiting points

Capture reactions into Borromean two-proton systems atrpwaiting points

Spectroscopy and lifetime measurements inGe66,Se69, and
Nichols
¹
,
Wadsworth
²
,
Bentley
³

et al. 2015
Phys. Rev. C
3
0
0
0
View full text Add to dashboard Cite

Shape and shell structure of lighter ( N≲90 ) neutron-rich nuclei based on a phenomenological Woods-Saxon potential

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Nuclear Data Sheets forA=69

Cited by 49 publications

References 175 publications

Capture reactions into Borromean two-proton systems atrpwaiting points

Capture reactions into Borromean two-proton systems atrpwaiting points

Spectroscopy and lifetime measurements inGe66,Se69, andNichols1, Wadsworth2, Bentley3 et al. 2015Phys. Rev. C3000View full textAdd to dashboardCite

Shape and shell structure of lighter ( N≲90 ) neutron-rich nuclei based on a phenomenological Woods-Saxon potential

Contact Info

Product

Resources

About

Spectroscopy and lifetime measurements inGe66,Se69, and
Nichols
¹
,
Wadsworth
²
,
Bentley
³

et al. 2015
Phys. Rev. C
3
0
0
0
View full text Add to dashboard Cite