The 54Fe(3He, t)54Co reaction at 70 MeV, Gamow-Teller strength

doi:10.1016/0375-9474(80)90482-0

Nuclear Physics A

Volume 346, Issue 3, 15 September 1980, Pages 497-509

https://doi.org/10.1016/0375-9474(80)90482-0 Get rights and content

Abstract

The ⁵⁴Fe(³He, t)⁵⁴Co reaction has been studied at 70 MeV with an energy resolution around 70 keV (FWHM). The triton spectra are characterized by sharp peaks up to 10 MeV excitation energy superimposed on a continuum. Most of the sharp peaks have a forward-peaked angular distribution and 38 peaks or groups of peaks are found to have an angular distribution corresponding to an angular momentum transfer of 2. Model considerations lead to the conclusion that most of these states are 1⁺ states. A shell-model calculation with parameters that account for the Gamow-Teller strength distribution in ⁴⁸Ca-⁴⁸Sc divides the β-strength in ⁵⁴Co in a ratio 5.7:6.8:1.3 for the T = 0, 1 and 2 states. A comparison is made with the 1⁺ spectrum in ⁵⁴Mn (T = 2 states) and a tentative assignment of T = 2 states in ⁵⁴Co is reached. The cross section has been calculated for the 0⁺, 1⁺ and 3⁺ states in ⁵⁴Co assuming a pure ( $π f_{72}^{−1} ν f_{72}^{−1}$ ) configuration finite-range DWBA is used and the conclusions are that the (³He, α, t) and (³He, d, t) processes give significant contributions to the cross sections.

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Nuclear Data Sheets for A = 54
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The 2005 evaluation for A=54 (2006Hu08) has been updated. Detailed experimental nuclear structure data and decay data for all nuclei with mass chain A=54 are presented in this current evaluation. The new data and information are given in following datasets:
- ⁵⁴Ca: ⁹Be(⁷⁶Ge, X) and Be(⁵⁵Sc, p), (⁵⁶Ti, 2p)
- ⁵⁴Sc: ⁵⁴Ca $β^{-}$ decay and ⁵⁴Sc IT decay
- ⁵⁴Ti: ⁵⁴Sc $β^{-}$ decay
- ⁵⁴Cr: ⁵⁴Mn ε decay, ⁵⁶Fe(μ, nupng), and ²³⁸U(⁶⁴Ni, Xγ)
- ⁵⁴Mn: ⁵¹V(²⁰Ne, Xγ), ⁵⁵Mn(p, pn), and ⁵⁶Fe(μ, nu2ng)
- ⁵⁴Fe: ⁵⁸Ni α decay, ⁹Be(⁵⁵Co, Xγ), ⁵⁴Fe(e, e'), ⁵⁴Fe(p, p'), and Coulomb Excitation
- ⁵⁴Co: ⁵⁴Ni ε decay, ⁵⁵Cu εp decay, ²⁸Si(³²S, αpnγ), ⁵⁴Fe(p,n), and ⁵⁴Fe(³He, t)
- ⁵⁴Ni: ⁵⁴Ni IT decay, ⁵⁵Zn εp decay, ⁹Be(⁵⁵Ni, Xγ), and ²⁴Mg(³²S, Xγ)
- ⁵⁴Zn: Ni(⁵⁸Ni, X)
Nuclear Data Sheets for A = 54
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(t,<sup>3</sup>He) reaction; new tool for studying spin-isospin excitations in neutron rich nuclei
1997, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Initial experiments were carried out to study spin-isospin transitions in nuclei using (t,³He) measurements. A triton beam was produced from the breakup reaction (⁴He,t-p) on a 9.25 g/cm² Be production target using a ⁴He beam of 620 MeV. With a beam of 70 enA a yield of 381 MeV tritons with 4.5 × 10⁶ particles/s was achieved. The first half of the A1200 beam transport system at NSCL was used to analyze the triton beam. The energy spread at the target position was estimated to be about 23 MeV. The second half of the A1200 was used to analyze the energy of ³He particles from the (t,³He) reaction. The dispersion matching method was applied to obtain good energy resolution despite the significant energy spread of the incident tritons. The achromatic properties of the A1200 system made it possible to obtain high-resolution (t,³He) spectra at θ = 0° with a resolution of $ΔE E = 0.002$ (ΔE = 780 keV).
Spin-isospin resonances in nuclei
1996, Nuclear Physics A
Spin-isospin excitations in nuclei have been investigated via the (³He,t) reaction at 450 MeV. The volume integrals of the effective interactions J_στ and J_τ for the (³He,t) reaction at 450 MeV have been empirically determined to be 172±17 MeV-fm³ and 53±5 MeV-fm³, respectively. These values are consistent with those obtained for the (p,n) reaction at the same bombarding energy per nucleon. The Gamow-Teller strength can be deduced with the same reliability as the (p,n) reaction at the bombarding energy above 100 MeV. The neutrino absorption cross sections by ⁷¹Ga is obtained on basis of the present (³He,t) measurement. The new SNU value obtained for ⁷¹Ga is 130.3±1.6(stat.)±16.8(syst.). The spin-isospin responses for the Sn isotopes, ¹¹⁶Cd and ¹⁰⁰Mo are presented and are discussed in relation with double β-decay. A measurement of decay protons from the spin-isospin resonances in ¹³N is presented. A new possibility of studying the spin-isospin responses on the β⁺ side via the (t,³He) reaction using a dispersion matching technique is discussed.
Spin-isospin excitations in nuclei via (<sup>3</sup>He,t) reactions at 450 MeV
1994, Nuclear Physics, Section A
Spin-isospin excitations in nuclei have been studied by means of the (³He,t) reactions at 450 MeV. The Gamow-Teller (GT) resonances are found to be strongly excited. A fine structure of the giant Gamow Teller resonances in medium-heavy nuclei is observed with an energy resolution of 130 keV. The volume integrals of the effective interactions J_στ and J_τ have been determined experimentally. The importance of high resolution observation of the (³He,t) reactions at intermediate energies, both, to study the double β decay processes and to measure the detection sensitivities for solar neutrino experiments is discussed.
Stretched proton-neutron configurations in fp-shell nuclei. (II). Systematics
1994, Nuclear Physics, Section A
The systematics of the binding energies of stretched proton-neutron configurations $(f_{72}, g_{92})_{8^{−}}$ , $(p_{32}, g_{92})_{6^{−}}$ , $(g_{92}, p_{32})_{6} −$ and $(g_{92})^{2}_{9^{+}}$ are studied over a wide range of f_p-shell nuclei. The effective proton-neutron interaction energies deduced from the data are nearly constant for $(p_{32}, g_{92})_{6^{−}} and (g_{92})^{2}_{9^{+}}$ states while the $(f_{72}, g_{92})_{8^{−}}$ configuration reveals an additional repulsive term proportional to the partial filling of the $f_{72}$ orbit in the target ground state. Two-body matrix elements are extracted. A crude shell model, which predicts that the excitation energy of a stretched state is equal to the sum of the single-particle energies, works well for the 6⁻ and 9⁺ states, but fails for the 8⁻ levels due to neglect of the additional interactions described above. The physics underlying the empirically introduced basic assumptions of the crude shell model is discussed. The binding energies are found to be linearly dependent on the mass number A and the isospin T_z component and are well described by the weak-coupling model of Bansal and French. The derived parameters agree with averaged values of a similar analysis for the single-particle states in the corresponding odd-even neighbours. The data indicate a significant change of the particle-hole energies with closure of the proton $f_{72}$ shell.

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^†: Work supported in part by funds from SNF (the Danish Natural Science Research Council).

^††: Work performed as part of the research programme of the “Stichting voor Fundamenteel Onderzoek der Materie“ (FOM), with financial support from the “Nederlandse Organisatie voor Zuiver Wetenschappelijk Onderzoek“.

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The 54Fe(3He, t)54Co reaction at 70 MeV, Gamow-Teller strength

Abstract

Nucl. Phys.

Nucl. Data Sheets

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

The ⁵⁴Fe(³He, t)⁵⁴Co reaction at 70 MeV, Gamow-Teller strength