Excited levels in 3He

Kim, C.C.; Bunch, S.M.; Devins, D.W.; Forster, H.H.

doi:10.1016/0031-9163(66)90629-9

Physics Letters

1966

DOI: 10.1016/0031-9163(66)90629-9

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Excited levels in 3He

C.C. Kim¹,

S.M. Bunch²,

D.W. Devins³

et al.

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1966

1972

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Cited by 27 publications

(3 citation statements)

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“…In the inelastic reaction 3 He(/>, />') 3 He, Kim et al 2 also reported evidence for three excited states in 3 He at excitation energies of 8.2, 10.2, and 12.6 MeV. Both reactions were subsequently repeated and the results were not confirmed.…”

mentioning

confidence: 84%

Evidence for an Anomaly in the Excitation Function of the ReactionH2(p,γ)3
Chang
¹
,
Diener
²
,
Ventura
³

1972
Phys. Rev. Lett.
21
0
1
0
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The excitation function of the capture reaction 2 U(p, y) 3 He has been measured in the range 1^ = 10-17.5 MeV. An anomaly was observed and is interpreted as a broad resonance in 3 He at an excitation energy of 14.5 ±0.5 MeV with a width of about 2 MeV.The study of possible excited states in the three-nucleon system was initiated both experimentally and theoretically when Ajdacic et al. 1 reported evidence for the existence of a bound trineutron in the reaction 3 H(w, p)nnn. In the inelastic reaction 3 He(/>, />') 3 He, Kim et al. 2 also reported evidence for three excited states in 3 He at excitation energies of 8.2, 10.2, and 12.6 MeV. Both reactions were subsequently repeated and the results were not confirmed. Thereafter, many searches have been made by means of a variety of nuclear reactions. 3 Most of them gave no indication of the existence of excited states in the three-nucleon system.A theoretical investigation of the resonance behavior in the three-nucleon system has been performed by Benohr. 4 With a simple soft-core twonucleon potential and a variational technique, he found three broad resonances with quantum numbers (L, S, T) = (1, i !), (1,1, |), and (1, i £). In the phase-shift analysis of nucleon-deuteron scattering, 5 the quartet />-wave shift shows a positive excursion of about 40° for £^ = 2-5 MeV, and the doublet p-wave phase shift has a small positive rise at high energy. These preliminary results could indicate the existence of negative-parity resonances in the three-nucleon system. Theoretical Argand plots 6 for 2 s + i.2r-u Ti [ T = (^)-i x(rje 2i6 -1), where q is the nucleon momentum and 7} the absorption coefficient] indicate a broad 42 p (^s+i.ar+i^ resonance at E + feT^14~ U MeV and another broad 22 P resonance at E + ^iT -18 -Si MeV. It is unlikely that these />-wave resonances would stand out in the excitation curves of the nucleon-deuteron elastic scattering when superimposed on a nonresonant background.

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mentioning

confidence: 84%

Evidence for an Anomaly in the Excitation Function of the ReactionH2(p,γ)3
Chang
¹
,
Diener
²
,
Ventura
³

1972
Phys. Rev. Lett.
21
0
1
0
View full text Add to dashboard Cite

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“…In principle, knowledge of excited states in the mass-three system could directly enrich our understanding of nuclear forces. For this reason, a report by Kim et al 1 of the observation of 3 He excited states prompted us and several other groups to re-examine the 3 He nucleus.…”

mentioning

confidence: 99%

“…Kim et al 1 observed peaks in the spectrum of protons inelastically scattered from 3 He at 30.2-MeV bombarding energy. The peaks, which were observed at two laboratory angles, were interpreted as indications of 3 1.…”

mentioning

confidence: 99%

Search for Excited States inHe3

1967

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tors for large values of angular momentum and energies close to the Coulomb barrier are strongly dependent upon the radius chosen for the nuclear surface. This dependence is reflected in our analysis and is quite pronounced for the g Q/2 state, although we do not factorize the partial width into a reduced width and a penetration factor. Similarly, the spectroscopic factors also depend weakly upon the strength of V v For the five states in 209 pb that we studied, this dependence is well described by Moore for discussions. The computer codes used were obtained by putting together codes written by T. Tamura and F. G. Perey.Uncertainties in the extracted spectroscopic factors arising from the above-mentioned dependences are much larger than those due to other optical model parameters.In conclusion, we note that the above method for extracting spectroscopic factors of the parent analog states appears very promising since the results do not depend strongly on the choice of optical-model parameters. This method can easily be modified to analyze the inelastic proton scattering through the isobaric analog resonances. It is simple to use and one retains the advantages offered by the Breit-Wigner single level formula. A method similar in spirit to the one presented has recently been reported. 9 Similar calculations are in progress for a number of other nuclei.It is a pleasure to acknowledge helpful discussions with H.A search for 3 He excited states in the reaction 3 He ip,p') 3 He* with proton bombarding energy of 30.9 MeV has been made. No inelastic peaks were observed.Since the discovery of 4 He excited states, the A = 3 nuclear system remains the only isobaric sequence in which no excited states are known to exist. In principle, knowledge of excited states in the mass-three system could directly enrich our understanding of nuclear forces. For this reason, a report by Kim et al. 1 of the observation of 3 He excited states prompted us and several other groups to re-examine the 3 He nucleus.Kim et al. 1 observed peaks in the spectrum of protons inelastically scattered from 3 He at 30.2-MeV bombarding energy. The peaks, which were observed at two laboratory angles, were interpreted as indications of 3 He states (r ^0.9 MeV) at approximately 10.2-and 12.6-MeV excitation. They reported laboratory cross sections of 2.0 and ~0.6 mb/sr, respectively, 1449

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Experimental evidence against the existence of a bound state of three neutrons

et al. 1967

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Excited levels in 3He

Cited by 27 publications

References 3 publications

Evidence for an Anomaly in the Excitation Function of the ReactionH2(p,γ)3
Chang
¹
,
Diener
²
,
Ventura
³

1972
Phys. Rev. Lett.
21
0
1
0
View full text Add to dashboard Cite

Evidence for an Anomaly in the Excitation Function of the ReactionH2(p,γ)3
Chang
¹
,
Diener
²
,
Ventura
³

1972
Phys. Rev. Lett.
21
0
1
0
View full text Add to dashboard Cite

Search for Excited States inHe3

Experimental evidence against the existence of a bound state of three neutrons

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Excited levels in 3He

Cited by 27 publications

References 3 publications

Evidence for an Anomaly in the Excitation Function of the ReactionH2(p,γ)3Chang1, Diener2, Ventura3 1972Phys. Rev. Lett.21010View full textAdd to dashboardCite

Evidence for an Anomaly in the Excitation Function of the ReactionH2(p,γ)3Chang1, Diener2, Ventura3 1972Phys. Rev. Lett.21010View full textAdd to dashboardCite

Search for Excited States inHe3

Experimental evidence against the existence of a bound state of three neutrons

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Product

Resources

About

Evidence for an Anomaly in the Excitation Function of the ReactionH2(p,γ)3
Chang
¹
,
Diener
²
,
Ventura
³

1972
Phys. Rev. Lett.
21
0
1
0
View full text Add to dashboard Cite

Evidence for an Anomaly in the Excitation Function of the ReactionH2(p,γ)3
Chang
¹
,
Diener
²
,
Ventura
³

1972
Phys. Rev. Lett.
21
0
1
0
View full text Add to dashboard Cite