Search for excited states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">He</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>7</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>with the (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>d</mml:mi><mml:mo>,</mml:mo><mml:mi>p</mml:mi></mml:mrow></mml:math>) reaction

Wuosmaa, A. H.; Rehm, K. E.; Greene, J. P.; Henderson, D. J.; Janssens, R. V. F.; Jiang, C. L.; Jisonna, L.; Moore, E. F.; Pardo, R. C.; Paul, M.; Peterson, D.; Pieper, Steven C.; Savard, G.; Schiffer, J. P.; Segel, R. E.; Sinha, S.; Tang, X. D.; Wiringa, R. B.

doi:10.1103/physrevc.72.061301

Cited by 53 publications

(72 citation statements)

References 19 publications

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“…In the present work, we calculated a SF = 0.608 (18), in agreement with the values from the neutron knock-out experiment [9] and with the SF from an R-matrix analysis of 7 Li(d, 2 He) 7 He reaction data [45]. A smaller SF has been extracted from the angular distribution study in the proton removal and neutron pickup reactions [11,12]. Although it should be noted that the spectroscopic factors are model-dependent and not pure observables [47], our result is in line with the theoretical prediction in Table I.…”

Section: Discussionsupporting

confidence: 69%

“…Contributions from other channels such as one-neutron and two-neutron stripping reactions were also examined. Results from this same experiment [36] reported the strong population of a 11 Be excited state at E x = 10.6 MeV, higher than the three-neutron emission threshold, which lies at 8.98 MeV [22]. The authors also provided evidence for a sequential population of 10 Be excited state at E x = 9.6 MeV, above the 8 Be + 2n threshold situated at 8.48 MeV [22].…”

Section: B Analysis Of 7 He Spectrasupporting

confidence: 48%

“…and it plays an important role in understanding the spin-orbit interaction in the light neutronrich dripline nuclei. The promotion of a nucleon from the p 3/2 to the p 1/2 orbital causes an excited state above 2 MeV, in the known cases of 9 Be, 9 B, 9 Li, 9 C, 11 C, and 11 B [22,26]. However, for the 7 He nucleus experimental results on the properties of 1/2 − state are still controversial and uncertain.…”

Section: Introductionmentioning

confidence: 97%

“…The solid lines represent the energy of the states in 7 He, the shaded bands correspond to the widths (Refs. [11,12] from the position and energy of coincident α particles, the reaction 9 Be + 6 He → X + 8 Be → X + α + α is reconstructed with the resonant particle spectroscopy technique [32]. Then, the center-of-mass energy of the undetected system X is obtained.…”

Section: Methodsmentioning

confidence: 99%

“…[4], replacing the carbon target by a liquid-hydrogen target; the low-lying resonance was not confirmed. Furthermore, no evidence for a state below 1 MeV has been found in five other experiments [5,11,12,14,15] using a variety of techniques. These studies have provided positive signs of a first-excited state at higher energy, although these observations are not completely in agreement among themselves, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Spectroscopy ofHe7using theBe9(He
Renzi
¹
,
Raabe
²
,
Randisi
³

et al. 2016
Phys. Rev. C
5
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1
0
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The unbound nucleus 7 He has been investigated via the reaction of a 16.8 MeV 6 He radioactive ion beam on a 9 Be target. The measurement of the outgoing 8 Be through its well characterized two-α decay permitted the energy of the 6 He +n system to be reconstructed. Through comparison with a complete Monte Carlo simulation incorporating R-matrix lineshapes, the 7 He ground state was determined to lie 0.380(28) MeV above the neutron decay with a width of = 0.179(21) MeV. A neutron spectroscopic factor SF = 0.608(18) was extracted in agreement with the most recent calculations. Significant evidence was found for a broad resonance lying at 2.6(2) MeV above threshold with a FWHM = 2.3(3) MeV. These parameters are fully consistent with the properties of 1/2 − state reported by Wuosmaa et al. [Phys. Rev. C 72, 061301(R) (2005)]. Limits were also put on the presence of narrow resonances seen in earlier experiments.

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