Single-Particle States of the Neutron from Gross Structure in the Proton Spectra of (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>d</mml:mi><mml:mo>,</mml:mo><mml:mi> </mml:mi><mml:mi>p</mml:mi></mml:math>) Reactions

Schiffer, J. P.; Lee, L.L.; Zeidman, B.

doi:10.1103/physrev.115.427

Cited by 80 publications

(7 citation statements)

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“…Earlier measurements of gross structure in (d,p) experiments showed that the I = 1 strength was, in fact, split into two rough groups which had relative strengths of about 2:1, the more intense group being at lower excitation energy. 2 This led to the conclusion that the lower group corresponded to the p^2 state and the upper to the p y2 state.…”

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confidence: 99%

“…Since Ca 40 is generally thought to be a doubly magic closed-shell nucleus with both protons and neutrons filling the d$ 2 shell and with its first excited state at 3.35 MeV, it might be expected that at least the low-lying energy levels in Ca 41 would be well described by one neutron placed in various she 11-model orbitals. The orbitals available are f 7/2 , p 2/2y p V2 , and/^2, in roughly this sequence.…”

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Measurement of Spins of Some States inCa41

1963

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Measurement of Spins of Some States inCa41

1963

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“…[5][6][7][8] The neutron ground-state configuration of Ti 49 is expected to be mainly (1/7/2) -1 -Thus, if one assumes that the neutrons and protons do not interact, or alternatively that the neutron-proton eigenfunctions for particles in the I/7/2 shell have well-defined seniority, the Ti 50 (d,OTi 49 and Ti 48 (J,^)Ti 49 reaction should proceed only to the ground state of Ti 49 . On the basis of this assumption, Schiffer et al, 9 in their (d>p) experiment on natural titanium, identified the 1=3 transition observed at 2.5 MeV in the gross-structure spectrum as the /s/2 single-particle state. If this assignment were correct, Ti 50 would contain a very large admixture of I/5/2 neutrons in its ground-state configuration.…”

Section: A Ti 50 (D0ti 49 Reactionmentioning

confidence: 94%

(d, t) Reaction on the Titanium Isotopes

Yntema

1962

Phys. Rev.

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The (d,t) reaction on the five stable isotopes of titanium has been studied at a deuteron energy of 21.4 MeV. The three even isotopes show two strong groups separated by about 2 MeV, both groups corresponding to pickup of a I/7/2 neutron. This indicates that there is considerable seniority mixing in the titanium isotopes. Groups corresponding to the pickup of 2p neutrons were observed in both Ti 50 and Ti 48 . In the reaction on Ti 48 , an 1 -2 transition to a state near 1.8 MeV in Ti 47 was found. The odd-even isotopes show a number of strong groups. The ground-state transitions in Ti 48 (d,0Ti 47 and Ti 47 (d,0Ti 46 have not been observed.

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“…This is illustrated by the for which the final nuclei have the p y2 states essentially full. 16 Table I indicates that the bound muon anomaly is diminished for 28 Ni and gone for 30 Zn, but not for 27 Co or 29 Cu for which the daughter nuclei have empty p 3/2 states. The singleparticle states which would seem most favorable to production of such y rays in muon capture are listed in Table II for a few nuclei.…”

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Nuclear De-Excitation Following Muon Capture and the Bound Muon Decay Anomaly

Chilton

1961

Phys. Rev. Lett.

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Experiments have been performed 1 " 3 to measure the rate of negative muon decay, l±~ -*e~ + v + v, when the muon is bound in the Coulomb field of a nucleus. Figure 1 presents the data of Yovanovitch 1 for the ratio of the bound decay rate to the free decay rate (rate for JU + decay or rate for muons bound to a low-Z nucleus), d dThe curve is a theoretical curve. 4 While the theoretical predictions are always less than R = 1 the experimental results rise well above R = 1 in the iron region, yet return quickly close to theory for 30 Zn, and fall well below the theo-retical curve for very large Z. The presence of this anomaly has been verified in detail by combining measurements by Lederman and Weinrich 2 of A^~/A^ and measurements of A^, 3 the total disappearance rate. These points are not included in Fig. 1 simply to avoid clutter. The other mode of disappearance of negative muons in matter is muon capture for which the basic reaction isTo determine whether the bound muon decay anomaly is really due to detection of y rays associated with muon capture rather than electrons from muon decay, we can take the difference between the experimental and theoretical values for R and divide by A c /A^+. Table I presents the values of (R' eX g -R th) A d*/ A c calculated using experimentally determined capture rates. 5 The near constancy of the values in Table I makes it appear that the anomaly is due to the detection of 1% of the muon capture events and that this sensitivity to muon capture mysteriously stops at Zn. The initially sharp Z dependence of the anomaly is just the Z dependence of muon capture rates ~Z 4 .To understand how background due to muon capture could appear in such careful experiments, let us consider some of the nuclear processes Table I. Proportionality of the bound muon decay anomaly to the capture rate.

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Single-Particle States of the Neutron from Gross Structure in the Proton Spectra of (d, p) Reactions

Cited by 80 publications

References 22 publications

Measurement of Spins of Some States inCa41

Measurement of Spins of Some States inCa41

(d, t) Reaction on the Titanium Isotopes

Nuclear De-Excitation Following Muon Capture and the Bound Muon Decay Anomaly

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