Spin determination of states with stretched configurations in 16N and 32P via the (d, α) reaction at 52 MeV

doi:10.1016/0375-9474(82)90130-0

Nuclear Physics A

Volume 382, Issue 2, 5 July 1982, Pages 173-184

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Abstract

The reactions $^{12} C (d, α)^{10} B,^{18} O (d, α)^{16} N and^{34} S (d, α)^{32} P$ have been investigated at E_d = 52 MeV. Vector analyzing powers as large as $¦iT_{11} ¦=0.85$ are observed. They exhibit patterns characteristic for final spins I = |L−1|, L or L + 1 and provide spin determinations at least for states of unique L-transfer. Local, zero-range DWBA calculations assuming deuteron-cluster pick-up reproduce qualitatively the observed effects. The method has been tested for states of known spin, and then has been applied to determine spins of states with stretched coupling in ¹⁶N: J^π = 3⁺(3.96 MeV), 4⁻(6.17 MeV) and in ³²P: J^π = 5⁺(4.75 MeV). There is strong evidence for further 5⁺ states in ³²P at 6.43, 7.96, 8.09 and 8.54 MeV.

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Cited by (7)

Nuclear Data Sheets for A = 32
2011, Nuclear Data Sheets
Nuclear spectroscopic information for experimentally investigated nuclides of mass 32 (Ne,Na,Mg,Al,Si, P,S,Cl,Ar) has been evaluated. The principal sources of the Adopted Levels presented for nuclides close to the stability line are Endtʼs evaluations (1990En08,1978En02). The data sets for reactions and decays, including all available gamma-ray data, are based mostly on the original literature. Except for the half-life of ³²Ne decay, no other details about its decay characteristics are available. Structure data for ³²Ne and ³²Na are limited to only one excited state in each. The ³²Mg nuclide is of central and prime relevance in the ‘island of inversion’ at or near N=20 semi-closed shell. The lifetime of only one excited state in ³²Mg is known. The spin-parity assignments of several levels in this nucleus are not quite firm. The structure of ³²Ar is limited to only one known state at low energy and two resonances in the giant-dipole excitation region. The ³²P, ³²S and ³²Cl remain the most extensively studied nuclei through various reaction channels.
Energy levels of light nuclei, A = 20
1998, Nuclear Physics A
Energy levels of A = 21-44 nuclei (VII)
1990, Nuclear Physics, Section A
The experimentally determined properties of A = 21–44 nuclides are complied and evaluated with special emphasis on nuclear spectroscopy.
Separate tables for each of the nuclides reviewed present the available information about the following properties (in this order):
- •
  - excitation energies E_x,
- •
  - γ-ray branching ratios b(γ),
- •
  - γ-ray mixing ratios σ,
- •
  - lifetimes γ_m or widths Λ,
- •
  - neutron, proton, or α-particle resonances,
- •
  - partial widths,
- •
  - single-nucleon transfer reactions,
- •
  - beta-decay,
- •
  - arguments for spin and parity (J^π) and isospin (T) assignments.
For each nuclide a master table summarizing the “best” or adopted values for E_x, J^π; T and τ_m or Λ precedes the auxiliary tables listed above.
The review of each A-chain concludes with a discussion of isospin multiplets.
Figures are presented of the level schemes of all nuclei and, for each A-chain, an overview of the relative energies of the ground states and lowest analogue states of all nuclei in the chain.
High-resolution spectroscopy of 32P (I). The 31P(d, p) study
1989, Nuclear Physics, Section A
In a magnetic spectrograph study of the ³¹P(d, p) reaction with 20 MeV polarized deuterons, an appreciable part of the transitions up to the neutron-emission threshold have been resolved. For positive-parity states, we obtain excellent agreement with shell-model calculations in the (s, d) shell. For the low-spin negative-parity states, unique assignments are obtained using additional information from a recent (n, γ) study.
The 27Al(d, α)25Mg reaction at E<inf>d</inf> = 12.5 MeV
1989, Nuclear Physics, Section A
In the ²⁷Al, d, α)²⁵Mg reaction at E_d = 12.5 MeV, angular distributions were measured over the laboratory angular range 3.75° –93.75° for final states up to an excitation energy of 9 MeV. The results have been compared with Hauser-Feshbach (HF) calculations. Angular distributions and total cross sections are in reasonable agreement with H F predictions for most states. A few states appear to be populated by an appreciable direct component.
Location of multiparticle-multihole strength in 16N via the 3-particle transfer reaction 13C(α, p)16N at 118 MeV
1986, Nuclear Physics, Section A
Differential cross sections were measured for the ¹³C(α, p)¹⁶N reaction at E_α = 118 MeV for an excitation energy range up to 14.5 MeV. Zero-range distorted wave Born approximation (DWBA) calculations were performed using microscopic form factors. Spin-parity assignments are suggested for states at 11.21 MeV (6⁻) and 11.81 MeV (7⁻) on the basis of Bansal-French-Zamick weak coupling calculations and DWBA calculations. Arguments from ¹⁶O(e, e'), ¹⁶O(p, p') and the present experiment are given relating to the location of J^π = 4⁻, T = 1 strength in ¹⁶N.

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^☆: Work supported in part by Gesellschaft für Kernforschung GmbH, Karlsruhe, FR Germany.

^∗: On leave from Institute of Nuclear Research, Academia Sinica, Shanghai, China.

^∗∗: Present address: Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720, USA.

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Nuclear Physics A

Abstract

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Cited by (7)

Nuclear Data Sheets for A = 32

Energy levels of light nuclei, A = 20

Energy levels of A = 21-44 nuclei (VII)

High-resolution spectroscopy of <sup>32</sup>P (I). The <sup>31</sup>P(d, p) study

The <sup>27</sup>Al(d, α)<sup>25</sup>Mg reaction at E<inf>d</inf> = 12.5 MeV

Location of multiparticle-multihole strength in <sup>16</sup>N via the 3-particle transfer reaction <sup>13</sup>C(α, p)<sup>16</sup>N at 118 MeV

Spin determination of states with stretched configurations in 16N and 32P via the (d, α) reaction at 52 MeV☆

Abstract

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Instr.

Nucl. Phys.

Spin determination of states with stretched configurations in ¹⁶N and ³²P via the ( $d, α$ ) reaction at 52 MeV☆