Sub-Coulomb neutron transfers from 17O onto 40Ca, 44Ca and 48Ca

doi:10.1016/0375-9474(74)90536-3

Nuclear Physics A

Volume 230, Issue 1, 16 September 1974, Pages 173-188

https://doi.org/10.1016/0375-9474(74)90536-3 Get rights and content

Abstract

The reactions ⁴⁸Ca(¹⁷O, ¹⁶O)⁴⁹Ca, ⁴⁴Ca(¹⁷0, ¹⁶O)⁴⁵Ca and ⁴⁰Ca(¹⁷O, ¹⁶O)⁴¹Ca have been observed at bombarding energies of 27,27 and 28.5 MeV, respectively. The cross sections for transitions to levels in the final nuclei with predominantly 2p_$32$ configurations were measured over the angular range 100–170°. The results have been analysed using a DWBA theory with Coulomb wave functions describing the entrance and exit channels. For a chosen wave function for the ¹⁷O ground state, the analysis yields the rms radii of the 2p_$32$ single-particle orbits in the odd Ca isotopes. With the use of a simple potential model the rms radii of the 1f_$72$ orbits are determined within reasonable limits and the sizes obtained compared with the rms radii of the neutron excesses in the Ca isotopes as calculated from Coulomb energy differences. The latter estimates are significantly lower than the values suggested by the present experiments.

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Nuclear Data Sheets for A = 41
2016, Nuclear Data Sheets
Available information pertaining to the nuclear structure of all nuclei with mass numbers A=41 ranging from Al (Z=13) to Ti (Z=22) are presented. The experimental reaction and decay data are evaluated and any inconsistencies or discrepancies are noted. The adopted values for various level properties (such as the spin, parity and and halflife) and gamma properties (energy, intensity and multipole character) are given.
Since the prior evaluation several new measurements have expanded our knowledge of A=41 nuclides. The half-life of the ground state of ⁴¹Si has been determined and a single excited state identified. Excited levels in ⁴¹P have been observed for the first time. In ⁴¹Cl, seven new excited states have been identified in deep inelastic and heavy ion transfer reactions. Half-lifes for four states in ⁴¹Ar have been updated and additional levels with gammas have been included from a new measurement using the multiple ion transfer reaction. In ⁴¹Ca via charge-exchange reaction measurements, several new excited states were observed. A number of new resonances in ⁴¹K have been identified via the (p,γ) reaction.
There remains a significant discrepancy in the half-life of the first excited state (980 keV) in ⁴¹K, with measurements differing by more than an order of magnitude. Transfer reactions suggest that this M1 transition should be l-forbidden, however, several measurements yield a lifetime which suggests a sizable M1 strength. Further measurements to resolve the current conflicts would be beneficial.
Nuclear data sheets for A = 41
2001, Nuclear Data Sheets
Nuclear spectroscopic information for the known nuclides of mass 41 (Al,Si,P,S,Cl,Ar,K,Ca,Sc,Ti) has been evaluated. The principal sources of the adopted levels presented are Endt's evaluations (1990En08, 1978En02). The data sets for reactions and decays, including all available gamma--ray data, are based mostly on the original literature. There are no data available for the excited states in 41 Al, 41 Si, 41 P, 41 Cl and 41 Ti.
Nuclear data sheets update for A = 49
1995, Nuclear Data Sheets
Nuclear data sheets update for A = 45
1992, Nuclear Data Sheets
Detailed test of distorting potentials for the transfer reactions 40Ca(7Li, 6Li/6He)
1986, Nuclear Physics, Section A
Angular distributions for the transfer reactions ⁴⁰Ca(⁷Li, ⁶Li)⁴¹Ca and ⁴⁰Ca(⁷Li, ⁶He)⁴¹Sc have been measured at 34 MeV, in small angular increments out to angles where the cross section has fallen by four orders of magnitude. Finite range DWBA calculations show a high sensitivity to different distorting potentials at the largest angle cross sections. It is found that a combination of Woods-Saxon and double-folded potentials does the best job of reproducing the data over the whole angular range.
Nuclear Data Sheets for A=49
1986, Nuclear Data Sheets
The 1978 evaluation of A=49 (78Ha15) has been revised using experimental decay and reaction data received by the cutoff date noted below. See also 75Be56 and 76Ha07 for mass excess and deformation calculations relevant to the unobserved nuclides of ⁴⁹Co and ⁴⁹Ni.
Thermonuclear reaction rates: see 79Wo07 for calculations on the production of A=49 nuclei via α- and p-induced reactions and 83Sa30 for a study on the effects of excited states on the reaction rates.
Neutron-induced reaction data: see the bibliography CINDA-A, CINDA-B, and supplements.

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^†: On leave from School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota, 55455, USA.

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Nuclear Physics A

Abstract

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Nuclear Data Sheets for A = 41

Nuclear data sheets for A = 41

Nuclear data sheets update for A = 49

Nuclear data sheets update for A = 45

Detailed test of distorting potentials for the transfer reactions <sup>40</sup>Ca(<sup>7</sup>Li, <sup>6</sup>Li/<sup>6</sup>He)

Nuclear Data Sheets for A=49