Spin-flip transitions in 46Ti, 48Ti and 50Cr excited by inelastic proton scattering

doi:10.1016/0375-9474(89)90052-3

Nuclear Physics A

Volume 499, Issue 2, 24 July 1989, Pages 367-380

https://doi.org/10.1016/0375-9474(89)90052-3 Get rights and content

Abstract

orward-angle cross sections for 1⁺ states have been measured in the non-closed-shell nuclei ⁴⁶Ti, ⁴⁸Ti, ⁵⁰Cr by 201 MeV proton inelastic scattering. The total measured 1⁺ strength is compared with microscopic distorted-wave impulse approximation calculations using large-scale shell-model wave functions. The quenching for the 1⁺ strength ranges from 0.3 to 0.5. For the low-energy isovector 1⁺ states the ratio of the orbital to the spin excitation is extracted.

References (21)

U.E.P. Berg et al.
Phys. Lett.
(1984)
C. Djalali et al.
Phys. Lett.
(1985)
A. Richter
11) H. Stein el al, to be...
B.A. Brown, private...
R.A. Arndt et al.
Phys. Rev.
(1983)
D.I. Sobel et al.
Phys. Rev.
(1985)
G.M. Crawley et al.
Phys. Rev. C
(1989)
B.D. Anderson et al.
Phys. Rev.
(1987)
N. Marty

There are more references available in the full text version of this article.

Cited by (28)

Nuclear Data Sheets for A=48
2022, Nuclear Data Sheets
Experimental nuclear structure data from various reactions and decays are compiled and evaluated for all known nuclides with mass number A=48 (S, Cl, Ar, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni). For each nuclide, detailed evaluated nuclear structure information is presented for each individual reaction and decay, and the best values combining all available data are recommended for spectroscopic properties, such as level energies, half-lives, γ-ray energies and intensities, decay radiations. No excited states have been identified in ⁴⁸S, ⁴⁸Cl, ⁴⁸Co and ⁴⁸Ni, among which the first three even have no measured ground-state half-lives and decay modes. For ⁴⁸Fe, a level scheme with a sequence of excited states was established for the first time from a recent one-neutron removal measurement by 2021Ya33. Data for excited states in ⁴⁸Ar, ⁴⁸K and ⁴⁸Mn remain limited; no decay scheme has been measured for ⁴⁸Ar and ⁴⁸K yet, while the decay scheme for ⁴⁸Ni is incomplete due to unobserved levels. ⁴⁸Ti is the most studied nuclide through various reactions and decays, followed by ⁴⁸V, ⁴⁰Ca, ⁴⁸Sc, and ⁴⁸Cr, among which no decay event to ⁴⁸Sc has been observed and the decay schemes for ⁴⁸V and ⁴⁸Cr are considered as incomplete. This work supersedes the previous full evaluations of A=48: 2006Bu08, 1993Bu04, 1985Al14, 1978Be01.
Spin-isospin excitations probed by strong, weak and electro-magnetic interactions
2011, Progress in Particle and Nuclear Physics
Gamow–Teller (GT) transitions are the most common weak interaction processes of spin–isospin ( $σ τ$ ) type in atomic nuclei. They are of interest not only in nuclear physics but also in astrophysics; they play an important role in supernovae explosions and nucleosynthesis. The direct study of weak decay processes, however, gives relatively limited information about GT transitions and the states excited via GT transitions (GT states); $β$ decay can only access states at excitation energies lower than the decay $Q$ -value, and neutrino-induced reactions have very small cross-sections. However, one should note that $β$ decay has a direct access to the absolute GT transition strengths $B$ (GT) from a study of half-lives, $Q_{β}$ -values and branching ratios. They also provide information on GT transitions in nuclei far-from-stability. Studies of $M 1 γ$ transitions provide similar information. In contrast, the complementary charge-exchange (CE) reactions, such as the ( $p, n$ ) or (³He, $t$ ) reactions at intermediate beam energies and 0°, can selectively excite GT states up to high excitation energies in the final nucleus. It has been found empirically that there is a close proportionality between the cross-sections at 0° and the transition strengths $B$ (GT) in these CE reactions. Therefore, CE reactions are useful tools to study the relative values of $B$ (GT) strengths up to high excitation energies. In recent (³He, $t$ ) measurements, one order-of-magnitude improvement in the energy resolution has been achieved. This has made it possible to make one-to-one comparisons of GT transitions studied in CE reactions and $β$ decays. Thus GT strengths in (³He, $t$ ) reactions can be normalised by the $β$ -decay values. In addition, comparisons with closely related $M 1$ transitions studied in $γ$ decay or electron inelastic scattering [( $e, e^{'}$ )], and furthermore with “spin” $M 1$ transitions that can be studied by proton inelastic scattering [( $p, p^{'}$ )] have now been made possible. In these comparisons, the isospin quantum number $T$ and associated symmetry structure in the same mass $A$ nuclei (isobars) play a key role. Isospin symmetry can extend our scope even to the structures of unstable nuclei that are far from reach at present unstable beam factories.
Nuclear Data Sheets for A = 50
2011, Nuclear Data Sheets
The experimental nuclear spectroscopic data for known nuclides of mass number 50 (Cl,Ar,K,Ca,Sc,Ti,V, Cr,Mn,Fe,Co,Ni) have been evaluated and presented together with Adopted properties for levels and γ rays. This evaluation has been carried out about 15 years after the previous one by Thomas Burrows (1995Bu29). Except for ⁵⁰Sc and ⁵⁰V, extensive new data have become available for all the other nuclides in the intervening years. The data for ⁵⁰Sc and ⁵⁰V have also been checked again in detail and several changes made. No data are yet available for excited states in ⁵⁰Cl, ⁵⁰Ar and ⁵⁰Ni. This work supersedes earlier evaluations (1995Bu29, 1990Bu18, 1984Al29, 1976Au07) of A=50 nuclides.
Nuclear Data Sheets for A = 48
2006, Nuclear Data Sheets
Photon scattering off <sup>52</sup>Cr: Two-phonon E1 strength at the N = 28 shell closure?
1998, Nuclear Physics A
Results of a ^natCr(γ,γ′) experiment at the S-DALINAC are reported for energies up to 7 MeV utilizing a Euroball Cluster detector. The excitation of a J = 1 state at 5544 keV is observed which is believed to belong to ⁵²Cr because of the strength of the signal and the large natural abundance. By a variety of empirical arguments a quadrupole-octupole-coupled two-phonon 1⁻ character is suggested for this transition. Quasiparticle random-phase approximation (QRPA) calculations are able to reproduce the energy and B(E1) transition strength remarkably well. The underlying microscopic structure is suggested to be more complex than a pure two-phonon picture. Furthermore, the calculations indicate a pure neutron ( $2p_{32}^{−1} 2p_{12}$ ) magnetic dipole structure for an excitation experimentally seen at 5098 keV which would provide a direct measure of ground-state correlations in ⁵²Cr.
Nuclear data sheets update for A = 46
1993, Nuclear Data Sheets

View all citing articles on Scopus

^☆: Supported in part by the Deutsche Forschungsgemeinschaft.

¹: Present address: DFVLR, D-5000 Köln, Fed. Rep. Germany.

View full text

Spin-flip transitions in 46Ti, 48Ti and 50Cr excited by inelastic proton scattering☆

Abstract

Phys. Lett.

Phys. Lett.

Phys. Rev.

Phys. Rev.

Phys. Rev. C

Phys. Rev.

Spin-flip transitions in ⁴⁶Ti, ⁴⁸Ti and ⁵⁰Cr excited by inelastic proton scattering☆